Fixed Resistors
Product Data Short Form
Belief in Technology
1
Fixed Resistors
TT electronics plc is a global electronics company.
Within its resistors business unit are multiple manufacturing
facilities and dedicated engineering teams providing custom
solutions.
Welwyn Components, IRC and BI Technologies are three market leading brands within this group, each with a 70-year track record
of resistive component innovation.
TT electronics offers the full spectrum of resistor technologies and a broad standard product range, in addition to providing custom
engineered solutions.
Medical Application
A manufacturer of portable automatic external defibrillators (AEDs) needed a
compact high voltage resistor for use in the charge regulation circuit. Standard
products from other sources were proving unreliable under conditions of
sustained high humidity and high voltage loading. The precision and stability
with time and temperature were critical as they directly impact the tight error
budget for delivered energy dosage. TT electronics engineers solved this
problem with a planar resistor with optimised thick-film element design and a
high integrity epoxy coating and supported the customer through their rigorous
approval process.
Other innovations in this area include pulse withstanding chip resistors for
monitor circuit protection and a 200J energy dump resistor based on reinforced
wirewound technology to enable daily self-test diagnostic cycles.
Aerospace Application
A designer working on an anti-ice aircraft surface heating system had to meet
stringent safety requirements in the event of failure of a heating circuit. The
failure mode to be mitigated was an “always on” condition, and this called for
a single shot disconnection switch. TT electronics engineers were contacted to
help identify a solution, but nothing was available off the shelf. A set of potential
solutions was proposed and the preferred option was a combination of selfswitching resistive heater and thermal fuse. This was developed from concept
into a fully qualified component within the required timescale. The compact
format of the design also contributed significantly to the customer’s mass
reduction target.
Consumer Application
Safety is becoming increasingly important in consumer products and a key
aspect is protection against fire by the use of fusing line input resistors. With
one component it is possible to reduce inrush current, protect against power
line surges and give flameproof circuit opening under fault conditions. One
company working in this area had a further need for fusing to be inaudible and
invisible to the consumer.
TT electronics devised a solution using a wirewound resistor with impact
absorbing coating which contains the fused element without fragmenting.
Other innovations include the offer of UL1412 recognised fusing resistors.
Fixed Resistors
Industrial Application
High-end industrial circuit breakers need to give reliable long-term performance
under harsh conditions. In particular, transient surges caused by switching of
inductive loads present a challenge. When a designer of industrial circuit breakers
needed to modernise a design to SMT format, a through-hole wirewound
protection resistor was proving hard to replace without filling a very large area
with chip resistors. TT electronics developed a solution whereby an axial part is
leadformed and packed in blister tape. The resulting “Z-form” component can be
picked, placed and reflowed as an SMT part.
Using the Short Form
1.
2.
3.
Choose the right technology - page 3
Find the best resistor technology for the set of features your design needs
Choose the right product series - pages 3 & 4
Use the SMT and Through Hole selector guides to identify a series which has
the required ratings, precision and value range
Choose the right product type - pages 5 to 16
Refer to product tables to select the correct size and link to further data
Or, if you know the product series, use the Quick Find index.
Quick Find
Series
1600/1900
3810
4500
4530
4800
ASC
BCN
BCS
BHPR
BPC
BPR
CAR
CC
CHP
CR
CRT
DSC
EMC
GC
GCR
HR
HTCR
HVC
HVP
Page
9
6
6
6
12
16
16
5
9
10
10
12
8
8
14
16
8
14
6
16
7
10
7
7
Series
LHVC
LOB
LRCS
LRF
LRF3W
LRMA
LRZ
MAR
MFP
MFR
MFR4P
MF-S
MH
MHP
OAR
OARS
PCF
PCFH
PCFP
PCR
PFC
PFC-D
PFC-HT
PHVD
Page
7
5
5
5
5
5
15
13
10
15
16
10
7
10
5
5
13
13
13
13
15
13
15
7
Series
PHVP
PLO
PR
PTCR
PTS
PWC
PWP
PWRL
RC
RCP
SC3
SMHP
SOT143
SOT23
SP20F
SPP
SQM
SQP
T
TD4
TPD
ULR
ULW
VRW
Page
7
6
13
15
15
8
9
6
13
13
10
11
13
13
14
14
11
11
8
15
14
6
14
8
Series
W20
W30
WA80Z
WA84F
WBC
WCCHB/WCDH
WCR
WDBR
WH
WHPC
WHS
WHVL
WL4
WMO-S
WPRT
WP-S
WPYP
WRM
WSM
Page
11
9
11
14
14
11
16
11
12
12
9
8
15
12
12
9
8
14
12
2
3
Fixed Resistors
Technology and Product Selector Guides
Thick Film
Technology
Thick Film
Low values
Good
Poor
High values
Excellent
Poor
Good
Tolerance
Good
Poor
Excellent
TCR
Fair
Poor
Excellent
on Steel
Carbon
Wirewound
Metal Alloy
Metal Foil
Poor
Excellent
Excellent
Poor
Fair
Poor
Poor
Poor
Poor
Poor
Poor
Fair
Fair
Excellent
Poor
Good
Fair
Excellent
Poor
Metal Film
Metal Oxide
Carbon Film
Fair
Poor
Poor
Fair
Poor
Fair
Poor
Composition
Power rating
Good
Excellent
Fair
Good
Fair
Fair
Excellent
Fair
Voltage rating
Excellent
Fair
Fair
Good
Fair
Poor
Poor
Poor
Fair
Stability
Fair
Fair
Good
Fair
Fair
Poor
Fair
Fair
Excellent
Overload
Good
Excellent
Fair
Good
Fair
Fair
Good
Fair
Poor
Surge
Good
Good
Poor
Good
Fair
Excellent
Good
Good
Fair
High Temp.
Good
Excellent
Fair
Good
Fair
Poor
Good
Good
Fair
Cs: Current Sense
Hv: High Value / Voltage
Fu: Fusible
Pr: Precision
Gp: General Purpose
Sg: Surge / Pulse
Hp: High Power
Ts: Temperature Sensor
Hr: High Reliability
Zo: Zero-ohm Jumper
Series
100G
10G
Category
Thick Film
Anti Sulphur
Chip array
Power MELF
Professional chip
Trimmable chip
Double-sided chip
Adhesive Attach
High value chip
High temperature
High voltage chip
Lower range HVC
Current sense sm.
Current sense
Current sense 3W
High current link
Semi-precision
PTC sensor chip
Pulse chip
Power chip 3W
TO-263 power
General chip
Power chip
Thin Film
Precision chip
High temp. PCF
Passivated PCF
Platinum sensor
MELF
TaN Thin Film
Precision chip
Divider chip
High temp. PFC
Divider / array
Divider
Wirebond chip
Metal Alloy
High power chip
Flat chip
Open air J-lead
Flat chip
Wirewound
Z-form w/w
Moulded w/w
1G
100M
10M
1M
100K
10K
1K
100R
10R
1R
R1
R01
R001
Value (Ω)
≥5
1-2
0.25- 0.5
≤0.1
Tol. (%)
≥100
50
25
10 - 15
≤5
TCR (ppm/°C)
100K
10K
1000
100
10
LEV (V)
100
10
1
0.1
Power (W)
0.01
Surface
Mount
Products
Gp
Gp
Sg
Hr
Gp
Sg
Gp
Hv
Hp
Hv
Hv
Cs
Cs
Cs
Zo
Pr
Ts
Sg
Hp
Hp
Gp
Hp
ASC
BCN
CHP
CR
CRT
DSC
GCR
HR
HTCR
HVC
LHVC
LRCS
LR(F)
LRF3W
LRZ
PCR
PTCR
PWC
SC3
SMHP
WCR
WHPC
Pr
Pr
Hr
Ts
Pr
PCF
PCFH
PCFP
PTS
WRM
Hr
Pr
Pr
Pr
Pr
Pr
PFC
PFC-D
PFCHT
SOT143
SOT23
WBC
Cs
Cs
Cs
Cs
BCS
LRMA
OARS
ULR
Hp
Hp
WA80Z
WSM
Fixed Resistors
Cs: Current Sense
Hv: High Value / Voltage
Fu: Fusible
Pr: Precision
Gp: General Purpose
Sg: Surge / Pulse
Hp: High Power
Ts: Temperature Sensor
Hr: High Reliability
Zo: Zero-ohm Jumper
Series
100G
10G
100T→
Category
Thick Film
Ultra-high ohmic
HV SIL resistor
HV SIL divider
TO227 power
Power SIL
Robust power SIL
Compact HV axial
Compact HV SIL
TO-126, 220, 247
Precision SIL div.
Precision SIL res.
Pulse planar
Ultra-HV axial
¼ – 1W HV axial
Steel power res.
Precision HV axial
Metal Film
High precision
UL1412 inrush
Ultra precision
Small flameproof
Professional film
0.6W 0207 film
Flameproof film
High voltage film
Semi-precision
Precision
Power precision
Nickel film sensor
Metal Oxide
Ceramic box vert.
Ceramic box hor.
Flameproof coat
Carbon Comp
Moulded axial
Wirewound
Vitreous tubular
Low val. hor. box
Low val. vert. box
UL1412 fibre core
UL1412 molded
Ceramic box vert.
Ceramic box hor.
Thermal fuse
UL1412 inrush
Vitreous axial
Flameproof pulse
Flameproof fusing
Low profile AI case
Al clad power
High surge
Ceramic box rad.
Flameproof coat
Capacitor mount
Metal Alloy
Low value axial
Low value open
0207 & wire links
Metal Foil
Ultra precision
1G
100M
10M
1M
100K
10K
1K
100R
10R
1R
R1
R01
R001
Value (Ω)
≥5
1-2
0.25- 0.5
≤0.1
Tol. (%)
≥100
50
25
10 - 15
≤5
TCR (ppm/°C)
100K
10K
1000
100
10
LEV (V)
100
10
1
0.1
Power (W)
0.01
Through-hole
& Off-PCB
Products
Hv
Hv
Hv
Hp
Hp
Hp
Hv
Hv
Hp
Hv
Hv
Sg
Hv
Hv
Hp
Hv
3810
4500
4530
BHPR
BPC
BPR
GC
HVP
MHP
PHVD
PHVP
PWP
T
VRW
WDBR
WHVL
Pr
Fu
Pr
Hp
Hr
Gp
Hp
Hv
Pr
Pr
Pr
Ts
CAR
EMC
MAR
MFP
MFR
MFR4P
MF-S
MH
PR
RC
RCP
TD4
Hp
Hp
Hp
SQM 1of2
SQP 1of2
WMO-S
Sg
CC
Hp
Cs
Cs
Fu
Fu
Hp
Hp
Fu
Fu
Hp
Sg
Fu
Hp
Hp
Sg
Hp
Sg
Hv
1600
PLO
PWRL
SPP
SP20F
SQM 2of2
SQP 2of2
TPD
ULW
W20
W30
WA84F
WCCHB....
WH
WHS
WPRT
WP-S
WPYP
Cs
Cs
Zo
LOB
OAR
WL4
Pr
4800
4
5
Fixed Resistors
Current Sense
BCS Series
8W Current Sense Metal Alloy Resistors
Power
(watts)
8
Type
BCS8
Res. Range
(ohms)
R0005 - R01
Tolerance %
1, 5
Max
Volts
-
TCR
(ppm/°C)
50
Dim.(mm) l, h, t
12.8, 6.4, 2.5
Datasheet - http://www.bitechnologies.com/pdfs/BCS.PDF
LOB Series
Low Resistance Metal Element Resistors
Type
Power
(watts)
LOB-1
LOB-1
LOB-1
1
1
1
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
0.005 - 0.1
1-5
0.005 - 0.1
1-5
0.005 - 0.1
1-5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LOB.PDF
LRCS Series
Type
0402
0603
0805
0.063
0.1
0.125, 0.25
Res. Range
(ohms)
TCR
(ppm/°C)
Dim. (mm)
l, w, h
R05 – 1R0
1, 5
200 – 400
R02 – 1R0
1, 5
200 – 600
R02 – 1R0
1, 5
200 - 600
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LRCS.pdf
1, 0.5, 0.32
1.6, 0.8, 0.45
2, 1.25, 0.55
Tolerance %
Max Volts
LR (F) Series
Low Value Flat Chip Resistor
Type
Power
(watts)
1206
2010
2512
0.5
1.0
1.5/2.0
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
3.2, 1.63, .8
5.23, 2.64, .8
6.5, 3.25, .8
Low Range 3 Watt SMT Chip Resistor
Type
Power
(watts)
LRF3W
3
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
AEC-Q200
Dim.(mm) l, w, h
0R003 - 1R
to ±1%
50
±100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LRF3W.PDF
LRMA Series
AEC-Q200
Dim.(mm) l, w, h
0R003 - 1R
1, 2, 5
±100
0R003 - 1R
1, 2, 5
±100
0R003 - 1R
1, 2, 5
±100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LRC-LRF.PDF
LRF3W Series
M 0805
N 0815
M 1206
T 2010
M 2512
T 2512
P 2512
9.9, 3.6
9.9, 3.6
9.9, 3.6
Small Size Low Value Chip Resistor
Power
(watts)
Type
Dim.(mm) l, Dia
3.25, 6.5, 0.9
Low Resistance Metal Alloy Resistors
Power
(watts)
0.5
1
1
1.5
1–2
1–2
3
Res. Range
TCR
Tolerance %
Max Volts
(ohms)
(ppm/°C)
R005 – R025
1, 5
100
R003 – R03
1, 5
100
R001 – R03
1, 5
75, 100, 275
R005 – R02
1, 5
75, 100, 275
R0005 – R06
1, 5
75, 100, 275
R001 – R05
1, 5
75, 100, 275
R001 – R1
1, 5
75, 100, 275
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LRMA.PDF
OAR Series
Dim.(mm) l, w, h
AEC-Q200
2, 1.25, 0.4
2.1, 3.75, 0.5
3.2, 1.6, 0.5
5, 2.5, 0.6
6.4, 3.2, 0.9-2.6
6.4, 3.2, 0.9-2.0
6.4, 3.2, 0.9-2.0
Open Air Sense Resistors
Type
Power
(watts)
OAR-1
OAR-2
OAR-3
1
3
5
Res. Range
(ohms)
Tolerance %
Max Volts
0R005 - 0.10
1, 5
to ±20
0R005 - 0.10
1, 5
to ±20
0R005 - 0.05
1, 5
to ±20
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/OAR.PDF
OARS / OARS-XP Series
Type
Power
(watts)
OARS1
2
OARSXP
4
TCR
(ppm/°C)
Dim.(mm) l, w, h
11.43, 1.65, 8.26
15.24, 1.65, 28.58
20.32, 1.65, 28.58
Surface Mount Sense Resistors
Res. Range
(ohms)
0R003 to
0R050
0R001 to
0R025
Tolerance %
Max Volts
TCR
(ppm/°C)
1
-
±20
11.18, 3.175, 3.05
1, 5
-
±20
12, 6.4, 4.6
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/OARS.PDF
Dim.(mm) l, w, h
AEC-Q200
Fixed Resistors
PLO Series
Low Resistance Power Wirewound Resistors
Type
Power
(watts)
PLO-3
PLO-5
PLO-7
PLO-10
3
5
7
10
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
R005 - R18
1, 2, 3, 5, 10
30 - 500
R005 - R18
1, 2, 3, 5, 10
30 - 500
R01 - R18
1, 2, 3, 5, 10
30 - 500
R01 - R18
1, 2, 3, 5, 10
30 - 500
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PLO.PDF
PWRL Series
Type
Res. Range
(ohms)
PWRL
3, 5, 7, 10
0R01 - 0R18
1, 2, 3, 5, 10
50 - 500
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PWRL.PDF
Tolerance %
ULR Series
ULR1S
ULR1
ULR15S
ULR2
ULR25
ULR3
22.4, 7.87, 7.87
22.4, 9.65, 8.89
35.3, 9.65, 8.89
47.8, 9.65, 8.89
Low Resistance Stand-up Power Wirewound Resistors
Power
(watts)
Type
Dim.(mm) l, w, h
Max Volts
TCR
(ppm/°C)
Dim.(mm) l, w,
25.4, 12 (3W)
Metal Strip Current Sense Resistors Surface Mount
Power
(watts)
1
1.0
1.5
2.0
2.5
3.0
Res. Range
(ohms)
R001 – R01
R0005 - R015
R001 – R01
R0005 - R01
R0035 - R006
R0005 - R003
Tolerance %
1, 5
1, 5
1, 5
1, 5
1, 5
1, 5
Max
Volts
-
TCR
(ppm/°C)
50
50, 75, 100, 150
50
50
50
50, 75, 100
Dim.(mm) l, w, h
3.2, 1.6, 0.6
6.4, 3.2, 1.4
5.1, 2.5, 0.6
6.4, 3.2, 1.4
6.4, 3.2, 1.4
6.4, 3.2, 1.4
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/ULR.PDF
High Value / Voltage
3810 Series
Type
3810
3811
3812
Ultra-High Value Precision Resistors
Power
(watts)
-
Res. Range
(ohms)
100M - 1T
100M - 1T
1T - 100T
Tolerance %
10, 20
1, 2, 5, 10
2, 5, 10
Max
Volts
500
1000
1000
TCR
(ppm/°C)
-500 to -3500
-500 to -3500
-500 to -3500
Dim.(mm) l, dia
25, 6
42.9, 6
48, 6
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/3810.PDF
4500 Series
High Voltage Planar Resistors
4501
4502
4503
4504
4505
4506
Power
(watts)
1
1.7
2
3
2.8
3.6
Res. Range
(ohms)
20K - 500M
36K - 750M
36K - 750M
62K - 1G
51K - 1G
82K - 1G
4507
4.5
180K - 1.5G
Type
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
Max
Volts
10000
10000
15000
15000
20000
20000
TCR
(ppm/°C)
100, 150
100, 150
100, 150
100, 150
100, 150
100, 150
1, 2, 5
20000
100, 150
Tolerance %
Dim.(mm) l, w, h
25.7, 2, 9
25.7, 2, 13
38.7, 2, 9
38.7, 2, 13
51.2, 2, 9
51.2, 2, 13
51.2, 2, 25.7
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/4500.PDF
4530 Series
Type
4531
4532
4533
4534
4535
4536
4537
High Voltage Planar Dividers
Power
(watts)
1.0
1.7
2.0
3.0
2.8
3.6
4.5
Res. Range
(ohms)
20K - 130M
36K - 250M
36K - 250M
62K - 450M
51K - 370M
82K - 660M
180K - 1.4G
Tolerance %
Max Volts
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
6500
6500
10000
10000
15000
15000
15000
TCR
(ppm/°C)
100
100
100
100
100
100
100
Dim.(mm) l, w, h
25.7, 2, 9
25.7, 2, 13
38.7, 2, 9
38.7, 2, 13
51.2, 2, 9
51.2, 2, 13
51.2, 2, 25.7
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/4530.PDF
GC Series
Type
GC55
GC65
GC70
High Value Thick Film Resistors
Power
(watts)
0.25
0.5
1.0
Res. Range
(ohms)
47K - 1G
47K - 1G
47K - 1G
Tolerance %
Max Volts
1, 2, 5
1, 2, 5
1, 2, 5
1700
3500
10000
TCR
(ppm/°C)
100
100
100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/GC.PDF
Dim.(mm) l, dia
6.2, 2.5
9, 3.6
14.5, 5.3
AEC-Q200
6
7
Fixed Resistors
HR Series
Type
0503
0805
1005
1206
High Value Surface Mount Resistors
Power
(watts)
-
Res. Range
(ohms)
10M - 20G
100M - 50G
100M - 50G
100M - 50G
Tolerance %
Max Volts
10
10
10
10
50
100
150
200
TCR
(ppm/°C)
0 to -2500
0 to -2000
0 to -1500
0 to -1000
Dim.(mm) l, w, h
1.25, .63, .5
2, 1.25, .6
2.5, 1.25, .7
3.2, 1.6, .7
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/HR.PDF
HVC Series
Type
1206
2010
2512
High Voltage Chip Resistors
Power
(watts)
0.3
0.5
1
Res. Range
(ohms)
10K - 1G0
10K - 1G0
10K - 1G0
Tolerance %
Max Volts
10, 5, 2, 1, 0.5
10, 5, 2, 1, 0.5
10, 5, 2, 1, 0.5
1000
2000
3000
TCR
(ppm/°C)
50, 100
50, 100
50, 100
Dim.(mm) l, w, h
3.2±0.4, 1.6±0.2, 0.7
5.1±0.3, 2.5±0.2, 0.8
6.5±0.3, 3.2±0.2, 0.8
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/HVC.PDF
HVP Series
High Voltage Planar resistors
Type
Power
(watts)
HVP04
HVP06
HVP08
HVP10
HVP15
HVP20
0.4
0.6
0.8
1
1.5
2
Res. Range
(ohms)
Tolerance %
Max Volts
1K – 250M
1, 5
2000
100
1K5 – 500M
1, 5
5000
100
2K – 500M
1, 5
7500
100
3K – 500M
1, 5
10,000
100
4K – 750M
1, 5
15,000
100
5K – 1G
1, 5
20,000
100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/HVP.pdf
0603
0805
1206
2010
2512
Dim. (mm)
l, w, h
10.2, 6.4, 2
12.7, 6.4, 2
19.1, 6.4, 2
25.4, 6.4, 2
38.1, 6.4, 2
50.8, 6.4, 2
Lower Range High Voltage Chip
LHVC Series
Type
TCR
(ppm/°C)
Power
(watts)
0.1
0.125
0.25
0.5
1
Res. Range
(ohms)
100K - 10M
100K – 10M
100K – 10M
50K – 10M
50K - 10M
Tolerance %
Max Volts
1, 5
1, 5
1, 5
1, 5
1, 5
200
400
500
1600
2000
TCR
(ppm/°C)
200
200
200
200
200
Dim. (mm)
l, w, h
1.6, 0.8, 0.45
2, 1.3, 0.55
3.1, 1.6, 0.55
5, 2.5, 0.55
6.4, 3.2, 0.55
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LHVC.pdf
MH Series
Type
MH25
MH37
High Voltage Metal Film Resistors
Power
(watts)
0.25
0.5
Res. Range
(ohms)
100K - 10M
100K - 1M
Tolerance %
Max Volts
1, 2, 5
1, 2, 5
1600
3500
TCR
(ppm/°C)
100
100
Dim.(mm) l, dia
6.2, 2.3
9, 3.7
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/MH.PDF
Precision High Voltage Divider
PHVD Series
Type
Power
(watts)
PHVD10
PHVD15
PHVD20
PHVD30
PHVD40
0.75
1.5
2.5
3.5
4.5
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
1K – 7G
10,000
1K – 10G
15,000
1K – 20G
20,000
0.1, 0.25, 0.5, 1
25, 50
1K – 30G
30,000
1K – 40G
40,000
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PHVD.PDF
Dim. (mm)
l, h, w
25.4, 7.6, 2.5
38.1, 12.7, 2.5
50.8, 15.2, 2.5
76.2, 15.2, 2.5
101.6, 15.2, 2.5
Precision High Voltage Planar Resistor
PHVP Series
Type
Power
(watts)
PHVP5
PHVP7
PHVP7B
PHVP10
PHVP10B
PHVP10C
PHVP15
PHVP15B
PHVP15C
PHVP20
PHVP20B
PHVP20C
PHVP30
PHVP40
1
0.8
1
1
1.3
2
1.5
2
3
2
3
4.5
6.5
9
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
1K – 3G
5000
1K – 1G
7000
1K – 2G5
7000
1K – 1G5
10,000
1K – 3G5
10,000
1K – 7G
10,000
1K – 4G
15,000
0.1, 0.25, 0.5, 1
15, 25, 50
1K – 5G
15,000
1K – 10G
15,000
1K – 7G
20,000
1K – 10G
20,000
1K – 20G
20,000
1K – 30G
30,000
1K – 40G
40,000
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PHVP.PDF
Dim. (mm) l, h, w
12.7, 5.1, 2
20.3, 3.8, 2
20.3, 5.1, 2.5
25.4, 3.8, 2
25.4, 5.1, 2.5
25.4, 7.6, 2.5
38.1, 3.8, 2
38.1, 5.1, 2.5
38.1, 12.7, 2.5
50.8, 5.1, 2
50.8, 6.4, 2.5
50.8, 15.2, 2.5
76.2, 15.2, 3
101.6, 15.2, 3
Anti-Sulphur Option
Fixed Resistors
T Series
Type
T43
T44
T48
High Voltage Precision Thick Film Resistors
Power
(watts)
1.5
3.5
10
Res. Range
(ohms)
10K - 10G
10K - 50G
33K - 50G
Tolerance %
Max Volts
1, 2, 5
1, 2, 5
1, 2, 5
4000
14000
50000
TCR
(ppm/°C)
25, 50, 100
25, 50, 100
25, 50, 100
Dim.(mm) l, dia
25.4, 8.4
50.8, 8.4
150, 8.4
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/T.PDF
VRW Series
Type
VRW25
VRW37
VRW68
High Voltage Thick Film Resistors
Power
(watts)
0.25
0.5
1
Res. Range
(ohms)
100K to 30M
100K to 10M
100K – 68M
Tolerance %
Max Volts
1, 2, 5
1, 2, 5
1, 2, 5
1600
3500
10000
TCR
(ppm/°C)
200
200
200
EN 60065
Dim.(mm) L, D
6.2, 2.5
9.0, 3.7
15.5, 5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/VRW.PDF
WHVL Series
Precision Low Inductance High Voltage Resistors
Type
Power
(watts)
WHVL2
WHVL3
WHVL5
WHVL7
WHVL10
WHVL12
WHVL15
2.9
3.8
5.6
7.5
10
12
15
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
1K – 100G
11,000
1K – 100G
14,000
1K – 100G
22,000
1K – 100G
33,000
0.1, 0.25, 0.5, 1
15, 25, 50
1K – 100G
45,000
1K – 100G
54,000
1K – 100G
67,000
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WHVL.PDF
Dim. (mm)
l, dia
27, 8
37, 8
52, 8
77, 8
102, 8.3
122, 8.5
152, 8.5
Capacitor Mount Balance/ Bleed Resistor
WPYP Series
Type
Type
Power
Power
(watts)
(watts)
WPYP8
WPYP10
10
13
Res.
Res. Range
Range
(ohms)
(ohms)
Tolerance
%
Tolerance %
Max
Max Volts
Volts
TCR
TCR
(ppm/°C)
(ppm/°C)
1R0 – 82K
1, 2, 5
685
100
1R0 – 120K
1, 2, 5
940
100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WPYP.pdf
Dim.
Pitch
Dim.(mm)
(mm) Pitch
22
31.8
Surge / Pulse
Carbon Composition Resistors
CC Series
Type
CC1
CC2
Power
(watts)
1
2
Res. Range
(ohms)
100R – 50K
100R – 10K
Tolerance %
Max Volts
10, 20
10, 20
-
TCR
(ppm/°C)
1000
1000
Dim. (mm)
l, dia
15, 6
18, 8
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/CC.pdf
CHP Series
Type
CHP1/8
CHP1/2
CHP1
CHP2
Metal Glaze™ Surface Mount Power Resistors
Power
(watts)
0.25
0.5
1
1.33
Res. Range
(ohms)
0R1 - 1M
0R1 - 350K
0R1 - 2M2
0R1- 2M2
Tolerance %
Max Volts
1, 2, 5
1, 2, 5
1, 2, 5
1, 2, 5
200
300
350
500
TCR
(ppm/°C)
50, 100
50, 100
50, 100
50,100
Dim.(mm) l, dia
3.25, 1.45
5.08, 2.01
6.38, 2.10
9.32, 2.67
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/CHP.PDF
DSC Series
Type
0805
1206
2010
2512
Double Sided Chip
Power
(watts)
0.25
0.33
0.75
1.5
Res. Range
(ohms)
1R0 - 1M0
IR0 - 4M7
IR0 - 4M7
IR0 - 4M7
Tolerance %
Max Volts
0.5, 1, 2, 5
0.5, 1, 2, 5
0.5, 1, 2, 5
0.5, 1, 2, 5
150
200
400
500
TCR
(ppm/°C)
100 - 200
100 - 200
100 - 200
100 - 200
Anti-Sulphur Option
Dim.(mm) l, w, h
2.0,1.25, 0.7
3.2, 1.6, 0.7
5.1, 2.5, 0.8
6.5, 3.2, 0.8
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/DSC.PDF
PWC Series
Type
0805
1206
2010
2512
Pulse Withstanding Chip Resistors
Power
(watts)
0.25
0.33
0.75
1.5
Res. Range
(ohms)
1R0 - 10M
1R0 - 10M
1R0 - 10M
1R0 - 10M
Tolerance %
Max Volts
0.5, 1, 2, 5
0.5, 1, 2, 5
0.5, 1, 2, 5
0.5, 1, 2, 5
150
200
400
500
TCR
(ppm/°C)
100 - 200
100 - 200
100 - 200
100 - 200
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PWC.PDF
Dim.(mm) l, w, h
2.0,1.25, 0.7
3.2, 1.6, 0.7
5.1, 2.5, 0.8
6.5, 3.2, 0.8
Anti-Sulphur Option
8
9
Fixed Resistors
PWP Series
Type
PWP04
PWP06
PWP08
PWP10
PWP15
PWP20
Pulse Withstanding Planar Resistors
Power
(watts)
0.4
0.6
0.8
1
1.5
2
Res. Range
TCR
Tolerance %
Max Volts
(ohms)
(ppm/°C)
100R – 200K
1, 5
±100
100R – 200K
1, 5
±100
100R – 200K
1, 5
±100
100R – 200K
1, 5
±100
100R – 200K
1, 5
±100
100R – 200K
1, 5
±100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PWP.PDF
Power
(watts)
Res. Range
(ohms)
W30 Series
Type
W31
WHS2
WHS3
WHS5
WHS7
10.16, 2, 6.35
12.7, 2, 6.35
17.78, 2, 6.35
24.4, 2, 6.35
38.1, 2, 6.35
50.8, 2, 6.35
Flameproof Wirewound Resistor
3
Tolerance %
Max Volts
TCR
(ppm/°C)
<R1: 5
R01 – 10K
500
100 - 1000
≥R1: 1, 2, 5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/W30.PDF
WHS Series
Type
Dim.(mm) l, w, h
Dim.(mm) l, dia
13, 5.6
Wirewound High Surge Resistors
Power
(watts)
2
3
5
7
Res. Range
TCR
Tolerance %
Max Volts
(ohms)
(ppm/°C)
1R0 – 330R
1, 2, 5
±200
1R0 – 330R
1, 2, 5
±200
1R0 – 330R
1, 2, 5
±200
1R0 – 330R
1, 2, 5
±200
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WHS.PDF
Dim.(mm) l, w, h
9, 3.6
14.5, 5.2
16.5, 7
25, 8.8
Compact Flameproof Power Wirewound Resistors
WP-S Series
Type
Power
(watts)
WP1S
WP2S
WP25S
WP3S
WP4S
WP5S
1
2
2.5
3
4
5
Res. Range
(ohms)
Tolerance %
TCR
(ppm/°C)
Max Volts
R068 to 430R
<20r: 5 20R: 1,2,5
50
<1R: 350 1R: 200
R05 to 900R
<20r: 5 20R: 1,2,5
50
<1R: 350 1R: 200
R05 to 900R
<20r: 5 20R: 1,2,5
75
<1R: 350 1R: 200
R01 to 2K2
<20r: 5 20R: 1,2,5
100
<1R: 350 1R: 200
R01 to 10K
<R10:5 R10: 1,2,5
100
<1R: 350 1R: 200
R015 to 6K8
<20r:5 20R: 1,2,5
150
<1R: 350 1R: 200
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WP-S.PDF
Dim.(mm) l, dia
6.2, 2.8
9.0, 3.6
12.5, 4.5
14.5, 5.2
13, 5.6
16.5, 7.0
High Power
1600/1900 Series
Type
1601
1905
1600
1602
1906
1603
1604
1605
1908
1607
1606
1608
1609
Power
(watts)
11
16
16.5
17
22
25
35
47
54
76
91
115
165
Tubular Vitreous Enamelled Wirewound Resistors
Res. Range
(ohms)
1 - 15K
1 - 30K
1 - 56K
1 - 43K
1 - 50K
1 - 83K
1 - 100K
1 - 100K
1 - 100K
1 - 100K
1 - 160K
1 - 180K
1 - 250K
Tolerance %
Max Volts
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
250
450
600
500
700
850
1300
1100
1200
1300
2100
2100
3000
TCR
(ppm/°C)
75 - 200
75 - 200
75 - 200
75 - 200
75 - 200
75 - 200
75 - 200
75 - 150
75 - 150
75 - 150
75 - 150
75 - 150
75 - 150
Dim.(mm) l, dia
33, 17.5
56.1, 14.5
61.5, 14.5
51, 17.5
64.3, 17.5
74.5, 17.5
102, 17.5
89.5, 24
102, 24
102, 32
166, 24
152, 32
216, 32
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/1600-1900.PDF
BHPR Series
Type
BHPR
TO-227 High Power Single/Dual Resistors
Power
(watts)
150, 200,
250, 300,
550, 600
Res. Range
(ohms)
Tolerance %
Max
Volts
TCR
(ppm/°C)
Dim.(mm) l, w, h
0R1 - 1K0
1, 5
-
100
38, 25, 11.8
Datasheet - http://www.bitechnologies.com/pdfs/BHPR.PDF
Fixed Resistors
BPC Series
Type
BPC3
BPC5
BPC7
BPC10
Planar Power Resistors
Power
(watts)
3
5
7.5
10
Res. Range
(ohms)
0R1 - 200K
0R1 - 200K
0R1 - 200K
0R1 - 200K
Tolerance %
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
Max
Volts
500
500
500
500
TCR
(ppm/°C)
100
100
100
100
Dim.(mm) l, h, t
10.2, 27.7, 2.5
12.7, 27.7, 2.5
19.1, 27.7, 2.5
25.4, 27.7, 2.5
Datasheet - http://www.bitechnologies.com/pdfs/BPC.PDF
BPR Series
Vibration-proof Planar Power Resistors
Type
Power
(watts)
BPR3
BPR5
BPR7
BPR10
BPR20
BPR30
BPR40
BPR50
3
5
7
10
20
30
40
50
Res. Range
(ohms)
Tolerance %
Max
Volts
TCR
(ppm/°C)
Dim.(mm) l, h, t
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
0R1 - 200K
1, 2, 5
500
100
Datasheet - http://www.bitechnologies.com/pdfs/BPR.PDF
HTCR Series
12.7, 17, 6.1
12.7, 27.2, 6.1
25.4, 20.8, 6.1
25.4, 27.2, 6.1
50.8, 27.2, 6.1
53.3, 37.3, 6.1
53.3, 50.0, 6.1
53.3, 57.7, 6.1
High Temperature Chip Resistors
Type
Power
(watts)
0805
1206
2010
2512
0.125
0.25
0.625
1
Res. Range
(ohms)
Tolerance %
Max
Volts
TCR
(ppm/°C)
Dim.(mm) l, h, t
1R0 - 10M
1, 5
150
100 - 200
1R0 - 10M
1, 5
200
100 - 200
1R0 - 10M
1, 5
400
100 - 200
1R0 - 10M
1, 5
500
100 -200
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/HTCR.PDF
2, 1.3, 0.5
3.2, 1.6, 0.5
5, 2.5, 0.65
6.3, 3.2, 0.65
Flameproof Power Metal Film Resistors
MFP Series
Type
Power
(watts)
MFP1
MFP2
1
2
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
Dim.(mm) l, dia
0R1 - 1M
1, 2, 5
350
100, 200, 300
1R0 - 1M
1, 2, 5
350
100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/MFP.PDF
MF-S Series
6.2, 2.5
10, 4
Power Metal Film Resistors
Type
Power
(watts)
MF1/2S
MF1S
MF2S
MF3S
0.5
1.0
2.0
3.0
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
Dim.(mm) l, dia
0R1 - 1M
1, 2, 5, 10
350
150 - 350
0R1 - 1M
1, 2, 5, 10
350
150 - 350
0R1 - 1M0
1, 2, 5, 10
350
150 - 350
0R1 - 1M0
1, 2, 5, 10
350
150 - 350
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/MF-S.PDF
MHP Family
6.2, 2.5
9, 3.6
12.5, 4.2
14.5, 5.3
Heatsink Mount Packaged Power Resistors
Type
Power
(watts)
MHP20S
MHP20
MHP35
MHP50
MHP100
MHP140
20
20
35
50
100
140
Res. Range
(ohms)
Tolerance %
Max
Volts
TCR
(ppm/°C)
Package
R01 - 51K
1, 5
50 - 250
R01 - 51K
1, 5
500
50 - 250
R01 - 51K
1, 5
500
50 - 250
R01 - 51K
1, 5
500
50 - 250
R01 - 51K
1, 5
700
50 - 250
R01 - 51K
1, 5
700
50 - 250
Datasheets - http://www.bitechnologies.com/power/index.htm
SC3 Series
TO-126
TO-220
TO-220
TO-220
TO-247
TO-247
High Power Chip Resistor
Type
Power
(watts)
Res. Range
(ohms)
Tolerance %
SC3
3
1R0 - 10K
1, 2, 5
Max Volts
TCR
(ppm/°C)
Dim.(mm) l, w, h
50
100
3.25, 6.5,
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/SC3.PDF
AEC-Q200
10
11
Fixed Resistors
SMHP Series
TO-263 Packaged Power Resistors
Type
Power
(watts)
SMHP
20
Res. Range
(ohms)
Max
Volts
Tolerance %
TCR
(ppm/°C)
R01 - 51K
1, 5
500
50 - 250
Datasheet - http://www.bitechnologies.com/pdfs/SMHP.PDF
SQM Series
Type
SQM2
SQM3
SQM5
SQM7
SQM10
2
3
5
7
10
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
0R1 – 33K
5
150
350, 400
0R1 – 56K
5
300
350, 400
0R1 – 100K
5
350
350, 400
0R1 – 200K
5
500
350, 400
0R1 – 200K
5
750
350, 400
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/SQM.pdf
SQP Series
Dim. (mm)
h, w, d
20, 11.5, 7.5
25, 12.5, 8.5
25, 12.5, 9
38, 12.5, 9
50, 12.5, 9
Ceramic Case Resistors - Wirewound / Metal Oxide
Type
Power
(watts)
SQP2
SQP3
SQP5
SQP7
SQP10
SQP15
SQP20
2
3
5
7
10
15
20
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
0R1-120K
5
0R1-150K
5
0R1 - 150K
5
350
0R1 - 200K
5
0R1 - 200K
5
1R0- 200K
5
2R0-200K
5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/SQP.PDF
W20 Series
Dim.(mm) l, w, h
18, 7, 7
22, 8, 9
22, 10, 9
35, 10, 9
49, 10, 9
49, 12.5, 11.5
60, 14.5, 13.5
Vitreous Enamelled Wirewound Resistors
Type
Power
(watts)
W21
W215
W22
W23
W24
3.0
5.0
7.0
10.5
14.0
Res. Range
(ohms)
Tolerance %
Power
(watts)
2
3
5
Max Volts
TCR
(ppm/°C)
0R1 - 10K
1, 2, 5
100
+75 to 200
0R1 - 15K
1, 2, 5
160
+75 to 200
0R1 - 22K
1, 2, 5
200
+75 to 200
0R15 - 60K
1, 2, 5
500
+75 to 200
0R2 - 100K
1, 2, 5
750
+75 to 200
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/W20.PDF
WA80Z Series
WA83Z
WA84Z
WA85Z
10.3, 10.1, 4.5
Ceramic Case Pluggable Resistor
Power
(watts)
Type
Dim.(mm) l, w, h
Dim.(mm) l, dia
12.7, 5.6
22, 7
22, 8
38, 8
53.5, 8
Cement Coated Surface Mount Wirewound Resistors
Res. Range
(ohms)
0.05 - 900R
0.01 - 2K2
0.015 - 6K8
Tolerance %
Max Volts
<0R1:5,10
0R1:1,2,5,10
1, 2, 5, 10
50
100
150
TCR
(ppm/°C)
<1R: 350 1R: 200
<1R: 350 1R: 200
<1R: 350 1R: 200
Dim.(mm) l, w, h
13.4±0.2, 3.6, 6.2
18.7±0.2, 5.2, 7.0
18.7, 7.0, 7.9
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WA80Z.PDF
WCCHB / WCDH Series
Type
WCDH600
WCCHB110
WCDH900
WCCHB166
WCDH1300
WCCHB216
WCCHB270
WCCHB320
Power
(watts)
600
650
900
950
1300
1400
1600
1800
Low Profile Aluminium Housed Wirewound Resistors
Res. Range
(ohms)
2R2 - 200R
2R2 - 200R
3R3 - 250R
3R3 - 250R
3R3 - 300R
3R3 - 300R
4R7 - 390R
5R1 - 470R
Tolerance %
Max Volts
5, 10
5, 10
5, 10
5, 10
5, 10
5, 10
5, 10
5, 10
-
TCR
(ppm/°C)
100
100
100
100
100
100
100
100
Dim.(mm) l, w, h
102, 68, 12.5
110, 76, 15
145, 68, 12.5
166, 76, 15
195, 68, 12.5
216, 76, 15
270, 76, 15
320, 76, 15
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WCCHB.PDF
WDBR Series
Type
WDBR1/2
WDBR1
WDBR2
WDBR3
WDBR5
WDBR7
Ultra Low Profile Dynamic Braking Resistors
Power
(watts)
300
700
780
900
1000
1490
Res. Range
TCR
Tolerance %
Max Volts
(ohms)
(ppm/°C)
22R – 100R
10
+500 - +600
12R – 150R
10
+500 - +600
12R – 150R
10
+500 - +600
12R – 150R
10
+500 - +600
12R – 150R
10
+500 - +600
47R – 150R
10
+500 - +600
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WDBR.PDF
Dim.(mm) l, w
31.9, 28.1
49.3, 35.9
61, 40.6
102, 70
122, 70
152, 102
SnPb Option
CECC 40201-002
Fixed Resistors
WH Series
Aluminium Housed Wirewound Resistors
Type
Power
(watts)
WH5
WH10
WH25
WH50
WH100
WH200
WH300
10
15
25
50
100
200
300
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
0R01 - 10K
1, 2, 5, 10
150
50, 100
0R01 - 20K
1, 2, 5, 10
250
50, 100
0R01 - 44K
1, 2, 5, 10
500
50, 100
0R015 - 120K
1, 2, 5, 10
1250
50,100
0R01 – 70K
1, 2, 5, 10
1900
25, 100
0R01 – 50K
1, 2, 5, 10
1900
25, 100
0R01 – 68K
1, 2, 5, 10
2500
25, 100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WH.PDF
WHPC Series
Dim.(mm) l, w, h
SnPb Option
CECC 40203-006
30, 17, 9
36.5, 21, 11
51, 28, 15
72.5, 30, 16
88, 47.5, 24.1
146, 72.5, 41.8
184, 72.5, 41.8
High Power Chip
Type
Power
(watts)
Res. Range
(ohms)
Tolerance %
1206
0612
2010
1020
1218
1225
0.5
0.5
1
1
1
1.5
1R – 10M
1R – 1M
1R – 10M
1R – 1M
1R – 1M
1R – 1M
1, 5
1, 5
1, 5
1, 5
1, 5
1, 5
Max Volts
TCR
(ppm/°C)
Dim. (mm)
l, w, h
200
200
200
200
200
200
100 – 200
100 - 400
100 - 200
100 - 400
100 - 400
100 - 400
3.1, 1.6, 0.55
1.6, 3.2, 0.55
5, 2.5, 0.55
2.5, 5, 0.55
3.1, 4.6, 0.55
3.1, 6.3, 0.55
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WHPC.pdf
WMO-S Series
Flameproof Metal Oxide Resistors
Type
Power
(watts)
WMO1/2S
WMO1S
WMO2S
WMO3S
WMO5S
WMO7S
0.5
1.0
2.0
3.0
5.0
7
Res. Range
(ohms)
Tolerance %
Max Volts
10R -100K
5
250
350
10R - 120K
5
350
350
10R - 150K
5
350
350
10R - 150K
5
350
350
10R - 180K
5
500
350
20R - 150K
5
750
350
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WMO-S.PDF
WPRT Series
Type
WPRT10
WPRT15
WPRT20
WPRT30
WPRT40
WPRT50
WSM1
WSM2
WSM3
Dim.(mm) l, dia
7.5, 3
10, 4.5
12, 5
16, 5.5
26, 8.5
32, 8.5
Wirewound Power Radial Terminal Resistors
Power
(watts)
10
15
20
30
40
50
Res. Range
TCR
Tolerance %
Max Volts
(ohms)
(ppm/°C)
1R0 – 820R
5
±350
1R0 – 1K0
5
±350
2R0 – 1K2
5
±350
3R0 – 1K5
5
±350
6R0 – 1K5
5
±350
6R0 – 1K5
5
±350
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WPRT.PDF
WSM Series
Type
TCR
(ppm/°C)
Dim.(mm) l, w, h
48, 10, 9
48, 12.5, 11.5
63, 12.5, 13.5
75, 19, 19
90, 19, 19
90, 19, 19
Moulded Surface Mount Wirewound Resistors
Power
(watts)
1
2
3
Res. Range
(ohms)
0R01 - 1K
0R01 - 2K
0R01 - 3K
Tolerance %
Max Volts
1, 2, 5, 10
1, 2, 5, 10
1, 2, 5, 10
100
100
100
TCR
(ppm/°C)
20 - 100
20 - 100
20 - 200
Dim.(mm) l, w, h
7.9, 7, 3.94
12, 10.5, 5.5
18, 16, 6.5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WSM.PDF
Precision
Ultra Precision Bulk Metal Foil Resistors
4800 Series
Type
Power
(watts)
Res. Range
(ohms)
4802/12/32
0.5
1R0 to 100K
4804
4805
1
1.5
0R5 to 200k
33R0 to 300K
Tolerance %
Max Volts
TCR
(ppm/°C)
0.005, 0.01
0.02, 0.05
0.01, 0.25, 0.5, 1
200
5
350
500
5
5
Dim.(mm) l, w, h
8.9, 10.2, 3.8, 7.5, 8, 2.5
9.7 5.4 9.7
15.2, 13.2, 3.8
22.6, 13.2, 3.8
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/4800.PDF
Ultra Precision Metal Film Resistors
CAR Series
Type
CAR5
CAR6
CAR7
Power
(watts)
0.25
0.33
0.5
Res. Range
(ohms)
10R0 - 3M
10R0 - 5M
10R0 - 10M
Tolerance %
Max Volts
0.01, 0.02,
0.05, 0.1,
1.0
250
350
500
TCR
(ppm/°C)
5, 10,
15, 25,
50
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/CAR.PDF
Dim.(mm) l, dia
7.2, 2.5
10, 3.7
15.5, 5.5
AEC-Q200
12
13 Fixed Resistors
MAR 40/42 Series
Type
Ultra Precision Metal Film Resistors
Power
(watts)
Res. Range
(ohms)
0.3
20R0 - 400K
Tolerance %
Max Volts
TCR
(ppm/°C)
250
2, 5
0.005, 0.01
MAR 40
MAR 42
0.02, 0.05
Dim.(mm) l, w, h
7.75, 3.3, 8.64
0.01, 0.25, 0.5,
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/MAR_40-42.PDF
PCF Series
8.25, 3.3, 8.64
Precision Surface Mount Resistor
Power
Res. Range
TCR
Type
Tolerance %
Max Volts
(watts)
(ohms)
(ppm/°C)
0201
0.031
50R - 33K
0.5, 1
15
25, 50
0402
0.063
10R - 205K
0.01 – 0.5
25
5 - 50
0603
0.063
2R – 1M
0.01 – 0.5
50
5 - 50
0805
0.1
1R – 2M
0.01 – 0.5
100
5 - 50
1206
0.125
1R – 2M5
0.01 – 0.5
150
5 - 50
1210
0.2
1R – 2M5
0.01 – 0.5
150
5 - 50
2010
0.25
1R – 3M
0.01 – 0.5
150
5 - 50
2512
0.5
1R – 3M
0.01 – 0.5
150
5 - 50
High Power (PCFH), Extended High Power (PCFX) and Passivated (PCFP) versions available
Dim.(mm) l, w, h
0.6, 0.3, 0.26
1, 0.5, 0.4
1.6, 0.8, 0.55
2, 1.3, 0.65
3.2, 1.6, 0.65
3.2, 2.6, 0.5
4.9, 2.4, 0.65
6.3, 3.1, 0.65
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PCF.pdf
PCR Series
Precision Thick Film Surface Mount Resistors
Power
(watts)
0.1
0.125
0.25
Type
0805
1005
1206
Res. Range
(ohms)
10R - 1M
10R - 1M
10R - 1M
Tolerance %
Max Volts
0.1 - 1
0.1 - 1
0.1 - 1
100
150
200
TCR
(ppm/°C)
50
50
50
Dim.(mm) l, w, h
2, 1.25, .6
2.5, 1.25, .7
3.2, 1.6, .7
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PCR.PDF
PFC-D Series
Precision 1206 Resistive Dividers
Power
(watts)
0.25
Type
PFC-D
Res. Range
(ohms)
10R - 200K
Tolerance %
0.05, 0.1, 0.5, 1
Max
Volts
100
TCR
(ppm/°C)
25, 50, 100
Dim.(mm) l, w, t
3.2, 1.6, 0.6
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PFC-DIVIDER.PDF
Precision Metal Film Resistors
PR Series
Type
Power
(watts)
PR4
PR5
0.25
0.5
Res. Range
(ohms)
Tolerance %
Max Volts
100R - 1M
250
15, 25, 50
0.1, 0.25,
0.5, 1
100R - 1M
350
15, 25, 50
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PR.PDF
RC Series
Type
RC55
RC65
RC70
TCR
(ppm/°C)
Dim.(mm) l, dia
6.2, 2.5
9, 3.6
Precision Metal Film Resistors
Power
(watts)
0.25
0.5
1.0
Res. Range
(ohms)
1R - 4M
1R - 4M
1R - 10M
Tolerance %
Max Volts
TCR
(ppm/°C)
0.05, 0.1, 0.25, 0.5
350
350
500
5, 10, 15,
25, 50, 100
Dim.(mm) l, dia
7.2, 2.5
10, 3.7
15.5, 5.5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/RC.PDF
Precision Metal Film Resistors
RCP Series
Type
RC55P
RC65P
RC70P
Power
(watts)
0.5
1.0
1.5
Res. Range
(ohms)
1R - 4M
1R - 4M
1R - 10M
Tolerance %
Max Volts
TCR
(ppm/°C)
0.05, 0.1, 0.25, 0.5
350
500
500
5, 10, 15,
25, 50, 100
Dim.(mm) l, dia
7.2, 2.5
10, 3.7
15.5, 5.5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/RCP.PDF
SOT143 Series
Type
SOT
Power
(watts)
0.25
4 Pin SMT Package
Res. Range
(ohms)
10R -100K
Tolerance %
Max Volts
0.05
100
TCR
(ppm/°C)
Track ±5
Dim.(mm) l, w, h
2.9, 1.3, 1
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/SOT143.pdf
SOT23 Series
Type
SOT
Surface Mount Divider Network
Power
(watts)
0.25
Res. Range
(ohms)
10R - 200K
Tolerance %
Max Volts
0.05
100
TCR
(ppm/°C)
Track ±5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/SOT23.pdf
Dim.(mm) l, w, h
2.9, 1.3, 1
SnPb Option
CECC 40101-004/804
Fixed Resistors
WBC Series
TaNSil® Wire Bondable Silicon Chip Resistors
Power
(watts)
0.25
0.25
Type
0202
0303
Res. Range
(ohms)
10R - 100K
10R - 100K
Tolerance %
Max Volts
to 0.05
to 0.05
100
100
TCR
(ppm/°C)
±25
Track 2
Dim.(mm) l, w, h
0.51, 0.51
0.76, 0.76
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WBC.PDF
WRM Series
Mini Melf Resistors
Power
(watts)
0.125
0.25
0.4
Type
0102
0204
0207
Res. Range
(ohms)
4R7 – 100K
R22 - 5M1
R16 - 10M
Tolerance %
Max Volts
1
0.1, 0.25,
0.5, 1, 2, 5
150
200
250
TCR
(ppm/°C)
50
5, 15, 25, 50, 100
25, 50, 100
Dim.(mm) l, dia
2.2, 1.35
3.7, 1.55
6.1, 2.4
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WRM.PDF
Fusible
EMC Series
Pulse Withstanding Fusible Flameproof Metal Film Resistors
Power
(watts)
2
Type
EMC2
Res. Range
(ohms)
4R7 - 68R
Tolerance %
Max Volts
10, 20
-
TCR
(ppm/°C)
100
UL1412
Dim.(mm) l, dia
10, 4
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/EMC.PDF
SP20F Series
Failsafe Molded Wirewound Resistors
Power
Res. Range
TCR
Tolerance %
Max Volts
Dim.(mm) I, dia
(watts)
(ohms)
(ppm/°C)
1
0R1 – 1K0
5, 10
±150
9.91, 3.56
Datasheet - http://www.irctt.com/file.aspx?product_id=187&file_type=datasheet
Type
SP20F
SPP Series
Fibre Core Conformal Coated Wirewound Resistors
Power
Res. Range
TCR
Tolerance %
Max Volts
Dim.(mm) l, dia
(watts)
(ohms)
(ppm/°C)
1
0R1 – 1K2
5, 10
±300
10.2, 3.8
2
0R1 – 2K4
5, 10
±300
14.5, 4.3
3
0R1 – 2K4
5, 10
±300
14.5, 4.3
Datasheet - http://www.irctt.com/file.aspx?product_id=48&file_type=datasheet
Type
SPP-1
SPP-2
SPP-3
TPD Series
UL1412
UL1412
High Current Thermal Fuse
Rated Current
Resistance
Fusing Temperature Working Voltage
(amps)
(milliohms)
(°C)
(volts dc)
55
≤0.7
235 ±15
42
http://www.irctt.com/file.aspx?product_id=534&file_type=datasheet
Type
TPD
Dim. (mm)
l, w, h
18.3, 4.7, 10.2
UL1412 Wirewound Mains Input Resistor
ULW Series
Power
(watts)
2
3
4
5
Type
ULW2
ULW3
ULW4
ULW5
Res. Range
(ohms)
4R7 - 100R
4R7 - 100R
4R7 - 100R
4R7 - 100R
Tolerance %
Max Volts
5
5
5
5
-
TCR
(ppm/°C)
200
200
200
200
Dim. (mm)
l, dia
9, 3.6
14.5, 5.2
13, 5.6
16.5, 7.2
UL1412
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/ULW.pdf
WA84F Series
Type
WA84F
Fusible Wirewound Resistors
Power
(watts)
1.6
Res. Range
(ohms)
0R2 - 30R
Tolerance %
Max Volts
5
100
TCR
(ppm/°C)
100 - 350
Dim.(mm) l, dia
14.5, 5.2
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WA84F.PDF
High Reliability
CR Series
Type
0503
0805
1005
1206
2010
2512
Surface Mount Resistors
Power
(watts)
0.063
0.125
0.125
0.25
0.5
1.0
Res. Range
(ohms)
1R - 10M
1R - 100M
1R - 100M
1R - 100M
1 - 1M
1 - 1M
Tolerance %
Max Volts
0.1 - 5
0.1 - 5
0.1 - 5
0.1 - 5
0.1 - 5
0.1 - 5
50
100
150
200
400
500
TCR
(ppm/°C)
100
100
100
100
100
100
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/CR.PDF
Dim.(mm) l, w, h
1.25, .63, .5
2, 1.25, .6
2.5, 1.25, .7
3.2, 1.6, .7
5.1, 2.5, .7
6.5, 3.2, .7
SnPb Option
CECC 40401-003/004/008
14
15
Fixed Resistors
MFR Series
Metal Film Resistors
Type
Power
(watts)
MFR3
MFR4
MFR5
0.4
0.5
0.75
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
1R0 - 1M
1
200
50
1R0 - 1M
0.5, 1
350
50
1R0 - 1M
0.5,
350
100 - 150
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/MFR.PDF
Dim.(mm) l, dia
3.5, 1.8
6.2, 2.5
9, 3.6
PFC Series
TaNFilm® Precision Chip Resistors
Power
Res. Range
Type
(watts)
(ohms)
0402
0.05
50R – 30K
0603
0.1
5R – 100K
0805
0.25
5R – 267K
1206
0.33
5R – 1M
1505
0.35
5R – 1M
2010
0.8
5R – 1M
2512
1
5R – 1M
High Temperature (PFC-HT) version available
TCR
(ppm/°C)
25 - 100
10 - 100
10 - 100
10 - 100
25 - 100
25 - 100
25 - 100
Tolerance %
Max Volts
0.1 - 5
0.02 - 5
0.02 - 5
0.02 - 5
0.02 - 5
0.02 - 5
0.02 - 5
75
75
100
200
100
175
200
SnPb Option
CECC 40101-019/803
Dim.(mm) l, w, h
1, 0.5, 0.3
1.6, 0.8, 0.5
2.1, 1.3, 0.5
3.2, 1.6, 0.6
3.9, 1.3, 0.6
5.2, 2.6, 0.6
6.5, 3.1, 0.6
SnPb Option
Anti – Sulphur Option
MIL-PRF-55342
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PFC.pdf
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PFC-HT.pdf
Temperature Sense
PTCR Series
Type
0805
1206
PTC Thermistor Chip
Power
(watts)
0.1
0.2
Res. Range
(ohms)
10R - 400R
10R - 800R
Tolerance %
Max Volts
2, 5, 10
2, 5, 10
100
200
TCR
(ppm/°C)
2200 - 3500
2200 - 3500
Dim (mm) l, w, h
2, 1.25, 0.6
3.2, 1.6, 0.7
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/PTCR.PDF
PTS Series
Type
0603
0805
1206
Platinum Film Temperature Sensors
Power
(watts)
-
Res. Range
(ohms)
1K0
100R & 1K0
100R & 1K0
Tolerance %
0.12, 0.24
0.12, 0.24
0.12, 0.24
Max
Volts
-
TCR
(ppm/°C)
+3850
+3850
+3850
Dim.(mm) l, w, t
1.6, 0.8, 0.5
2.1, 1.3, 0.5
3.2, 1.6, 0.6
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/RTD.PDF
TD4 Series
Type
TD4
Nickel Film Temperature Sensor
Power
(watts)
-
Res. Range
(ohms)
20R - 1K
Tolerance %
Max Volts
1.0, 2.0, 4.0
-
TCR
(ppm/°C)
6000
Dim.(mm) l, dia
7.2, 2.5
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/TD4.PDF
Zero-Ohm Jumper
High Current Jumper Chip
LRZ Series
Type
Current
(amps)
Res. Range
(ohms)
Tolerance %
0805
15
0.003 max
1206
20
0.003 max
2010
30
2512
35
Max Volts
TCR
(ppm/°C)
Dim.(mm) l, w, t
-
-
-
2.0, 1.25, 0.61
-
-
-
3.2, 1.25, 0.61
0.003 max
-
-
-
5.23, 2.64, 0.74
0.003 max
-
-
-
6.5, 3.25, 0.74
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/LRZ.pdf
WL4 Series
Type
WL4
WLT
Jumper Resistors
Power
(watts)
Res. Range
(ohms)
-
0.012 max
Tolerance %
Max Volts
TCR
(ppm/°C)
Wire link taped, 0.6 / 0.7 / 0.8mm dia x 52mm
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WL4.PDF
Dim.(mm) l, dia
6.2, 2.3
AEC-Q200
Fixed Resistors
General Purpose
ASC Series
Anti Sulphur Chip Resistors
Power
(watts)
0.063
0.1
0.125
0.25
0.33
0.625
1
Type
0402
0603
0805
1206
1210
2010
2512
Res. Range
(ohms)
1R0 - 10M
1R0 - 10M
1R0 - 10M
1R0 - 10M
1R0 - 10M
1R0 - 10M
1R0 - 10M
Tolerance %
Max Volts
1
1
1
1
1
1
1
50
50
150
200
200
200
250
TCR
(ppm/°C)
100 – 200
100 – 200
100 – 200
100 – 200
100 - 200
100 - 200
100 -200
Dim.(mm) l, w, h
Anti – Sulphur
1, 0.5, 0.35
1.6, 0.8, 0.45
2, 1.25, 0.5
3.1, 1.55, 0.55
3.2, 2.6, 0.55
5, 2.5, 0.55
6.35, 3.2, 0.55
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/ASC.PDF
BCN Series
Thick Film Chip Resistor Arrays
Package Power Res. Range
Tolerance
Array Description
Type
Max Volts
(watts)
(ohms)
%
# Res. Circuit
Size
BCN062
0.063
10R – 1M0
5
12.5
2
Isolated
0302
BCN064
0.125
10R – 1M0
5
12.5
4
Isolated
0502
BCN2D
0.125
10R – 1M0
5
50
2
Isolated
0606
BCN10
0.25
10R – 1M0
5
25
4
Isolated
0804
BCN164A/AB(I)
0.25
10R – 1M0
1, 2, 5
50
4
Isolated
1206
BCN168RB/SB
0.25
100R – 1M0
5
25
8
Bussed
1206
BCN21
0.5
68R – 220K
5
25
8
Bussed
1608
BCN4D(BI)
0.5
10R – 1M0
1, 5
75
4
Isolated
2112
BCN318RB(I)/SB(I)
0.5
22R – 1M0
1, 2, 5
50
8
Bussed
2512
Datasheet - http://www.bitechnologies.com/pdfs/bcn.pdf
CRT Series
Dim. (mm)
l, w, h
0.8, 0.6, 0.35
1.4, 0.6, 0.35
1.6, 1.6, 0.5
2, 1, 0.36
3.2, 1.6, 0.5-0.6
3.2, 1.6, 0.5
4, 2.1, 0.55
5.34, 3.1, 0.55
6.4, 3.1, 0.55-0.6
Trimmable Surface Mount Resistors
Power
(watts)
0.1
0.125
0.25
Type
0805
1206
1210
Res. Range
(ohms)
10R - 1M
10R - 1M
10R - 1M
Tolerance %
Max Volts
±20
±20
±20
100
200
200
TCR
(ppm/°C)
250
250
250
Dim.(mm) l, w, h
2, 1.25, .5
3.2, 1.6, .55
3.2, 2.6, .55
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/CRT.PDF
Glueable Chip Resistors
GCR Series
Type
Current
(amps)
Res. Range
(ohms)
Tolerance %
Max Volts
TCR
(ppm/°C)
0805
0.125
1R0 - 10M
1, 5
150
100 - 200
2, 1.3, 0.5
1206
0.25
1R0 - 10M
1, 5
200
100 - 200
3.2, 1.6, 0.5
2010
0.625
1R0 - 10M
1, 5
400
100 - 200
5, 2.5, 0.65
2512
1
1R0 - 10M
1, 5
500
100 -200
6.3, 3.2, 0.65
Dim.(mm) l, w, h
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/GCR.PDF
MFR4P Series
Metal Film Resistors
Type
Power
(watts)
MFR4P
0.6
Res. Range
(ohms)
Tolerance %
R22 - 1M
1, 2, 5,
250
50
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/MFR4P.PDF
WCR Series
Type
0201
0402
0603
0805
1206
1210
2010
2512
Max Volts
TCR
(ppm/°C)
Dim.(mm) l, dia
6.2, 2.5
General Purpose Surface Mounted Resistors
Power
(watts)
0.05
0.1
0.063
0.125
0.25
0.25
0.5
1.0
Res. Range
(ohms)
10R – 1M
1R – 1M
1R – 10M
1R – 10M
1R – 10M
1R – 10M
1R – 10M
1R – 10M
Tolerance %
Max Volts
1
1
1
1
1
1
1
1
25
50
50
150
200
200
200
200
TCR
(ppm/°C)
250
100
100
100
100
100
200
200
Datasheet - http://www.welwyn-tt.com/pdf/datasheet/WCR.PDF
Dim.(mm) l, w, h
0.6, 0.3, 0.23
1, .5, .35
1.6, .8, .5
2, 1.25, .5
3.2, 1.6, .55
3.2, 2.6, 0.55
5, 2.5, .56
6.3, 3.2, .56
Anti – Sulphur Option
16
17
Fixed Resistors
Colour Code for Band-marked Resistors
Value 1
Silver
Gold
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Blank
Value 2
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
Value 3
Multiplier
0
1
2
3
4
5
6
7
8
9
x 0.01
x 0.1
x1
x 10
x 100
x 1K
x 10K
x 100K
x 1M
x 10M
x 100M
x 1G
Tolerance
10%
5%
K
J
1%
2%
F
G
0.5%
0.25%
0.1%
0.05%
D
C
B
A
20%
M
Example 1
5-Band Marking
E24/E96 values
4 7 0 x100 1% = 47K 1%
Example 2
4-Band Marking
E24/E96 values
without tolerance
4 7 0 x100 = 47K
Example 3
4-Band Marking
E24 values
8 2 x1K 5% = 82K 5%
E.g. MFR4 E96
E.g. WRM0204 E96
E.g. WMO3S E24
Further Technical Information
Application Notes for current sense, circuit protection, pulse and overload ratings,
energy metering, lighting, medical, automotive, high voltage design and more
http://www.welwyn-tt.com/literature.asp
Parametric Search for selection of products by parameters, package, technology
and application
http://www.welwyn-tt.com/products/resistors/resistors.asp
Calculation Tools for pulse loading, temperature derating, critical resistance,
capacitor bleed and more
http://www.welwyn-tt.com/products/resistors/calculation-tools.asp
Product Compliance Matrix for RoHS and REACH SVHC status, termination finish,
obsolescence data, SnPb availability and more
http://www.welwyn-tt.com/downloads/pbfree/rohs-compliance-matrix.pdf
Tin Whisker Report test report on tin whisker qualification of Pb-free finishes
http://www.welwyn-tt.com/downloads/pbfree/sn-whisker-report.pdf
Fixed Resistors
Common Formulae
V2/P
R
V/I
V.I
Preferred Values
I2.R
P
P/I2
V2/R
P/I
V/R
V
√(P.R)
√(P/ R)
I
P/V
I.R
R is resistance value (ohms) P is power dissipated (watts)
V is voltage dropped (volts) I is current flowing (amps)
E.g. R = V / I
Terms and Definitions
Ambient Temperature
Critical Resistance
Isolation Voltage (Voltage Proof)
LEV (Max Volts)
Overload
Power Rating
Pulse (Surge)
Series
TCR
Tolerance
Type
VCR
The temperature which would be adopted by the body
of the resistor under application conditions except with
negligible power dissipation in the resistor.
The resistance value at which application of the LEV
causes dissipation of the full rated power.
The maximum continuous voltage which may be applied between the resistor and a conductor in contact
with its insulated body.
The maximum continuous voltage which may be applied across a resistor whose ohmic value is greater than
the critical resistance.
Power dissipation which exceeds the power rating for
durations exceeding 0.1s.
The maximum continuous power that may be dissipated by a resistor whose ohmic value is less than the
critical resistance and at a defined maximum ambient
temperature.
Power dissipation which exceeds the power rating for
durations less than 0.1s.
A set of components with the same basic design
features and performance and usually a range of sizes
and ratings.
Temperature Coefficient of Resistance; the maximum
magnitude of reversible ohmic value change per degree
centigrade due to deviation in body temperature from a
reference normally of 20°C.
The maximum allowable magnitude of deviation from
nominal ohmic value measured at delivery and at room
temperature.
An individual member of a series with specified size and
rating.
Voltage Coefficient of Resistance; the maximum reversible reduction in ohmic value per volt due to an increase
in applied voltage.
1
1.01
1.02
1.04
1.05
1.06
1.07
1.09
1.1
1.11
1.13
1.14
1.15
1.17
1.18
1.2
1.21
1.23
1.24
1.26
1.27
1.29
1.3
1.32
1.33
1.35
1.37
1.38
1.4
1.42
1.43
1.45
1.47
1.49
1.5
1.52
1.54
1.56
1.58
1.6
1.62
1.64
1.65
1.67
1.69
1.72
1.74
1.76
1.78
1.8
1.82
1.84
1.87
1.89
1.91
1.93
1.96
1.98
2
2.03
2.05
2.08
2.1
2.13
2.15
2.18
2.21
2.23
2.26
2.29
2.32
2.34
2.37
2.4
2.43
2.46
2.49
2.52
2.55
2.58
2.61
2.64
2.67
2.71
2.74
2.77
2.8
2.84
2.87
2.91
2.94
2.98
3.01
3.05
3.09
3.12
E192
3.16
3.2
3.24
3.28
3.32
3.36
3.4
3.44
3.48
3.52
3.57
3.61
3.65
3.7
3.74
3.79
3.83
3.88
3.92
3.97
4.02
4.07
4.12
4.17
4.22
4.27
4.32
4.37
4.42
4.48
4.53
4.59
4.64
4.7
4.75
4.81
4.87
4.93
4.99
5.05
5.11
5.17
5.23
5.3
5.36
5.42
5.49
5.56
5.62
5.69
5.76
5.83
5.9
5.97
6.04
6.12
6.19
6.26
6.34
6.42
6.49
6.57
6.65
6.73
6.81
6.9
6.98
7.06
7.15
7.23
7.32
7.41
7.5
7.59
7.68
7.77
7.87
7.96
8.06
8.16
8.25
8.35
8.45
8.56
8.66
8.76
8.87
8.98
9.09
9.2
9.31
9.42
9.53
9.65
9.76
9.88
10 etc…
E96
1
1.02
1.05
1.07
1.1
1.13
1.15
1.18
1.21
1.24
1.27
1.3
1.33
1.37
1.4
1.43
1.47
1.5
1.54
1.58
1.62
1.65
1.69
1.74
1.78
1.82
1.87
1.91
1.96
2
2.05
2.1
2.15
2.21
2.26
2.32
2.37
2.43
2.49
2.55
2.61
2.67
2.74
2.8
2.87
2.94
3.01
3.09
3.16
3.24
3.32
3.4
3.48
3.57
3.65
3.74
3.83
3.92
4.02
4.12
4.22
4.32
4.42
4.53
4.64
4.75
4.87
4.99
5.11
5.23
5.36
5.49
5.62
5.76
5.9
6.04
6.19
6.34
6.49
6.65
6.81
6.98
7.15
7.32
7.5
7.68
7.87
8.06
8.25
8.45
8.66
8.87
9.09
9.31
9.53
9.76
10 etc…
E24
1
1.1
1.2
1.3
1.5
1.6
1.8
2
2.2
2.4
2.7
3
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10 etc…
E12
1
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10 etc…
E6
1
1.5
2.2
3.3
4.7
6.8
10 etc…
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
18
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LIT-SF-FIXEDRESIST - Issue 7