Cement Coated Wirewound Resistors

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Cement
CementCoated
Coated
Wirewound
WirewoundResistors
Resistors
Welwyn Components
W30 Series
Series
·W30
Values down to 10m ohms
·s Values
Tolerancedown
to 1% to 10m ohms
·s Tolerance
Flameproof
toprotection
1%
·s Flameproof
Custom builtprotection
to meet pulse requirements
s
Custom built to meet pulse requirements
Electrical Data
W31
Notes
Power rating at 25°C
watts
Power rating at 70°C
watts
2.5
Resistance range
ohms
0R01 to 10K
TCR (-55 to 155°C)
3.0
ppm/°C
Resistance tolerance
%
Standard values
See below
<R10: 5 >=R10: 1, 2, 5
E24 series preferred
Thermal impedance
°C/watt
Ambient temperature range
°C
Limiting element voltage
-55 to 155
volts
TCR
ppm/°C
Other values to special order
83
100
0.01 ohms <1000
0.033 ohms <500
0.091 ohms <200
10 ohms <150
10K ohms <100
Physical Data
Maximum Dimensions (mm) and Weight (g)
Type
L max.
D max.
W31
13
5.6 (note 1)
f min.
22.75
d nom.
Wt.nom.
0.8
1.0
d
D
L
f
_0R1
Note 1: 5.8 for values <
Construction
Marking
A high quality ceramic substrate is assembled with
interference fit end caps to which are welded the element
W31 resistors are legend marked with type reference,
resistance value and tolerance. Values are marked in
accordance with IEC 62.
to the body, providing an effective seal which is impervious to
moisture, shock, vibration, fungus and salt spray.
Solvent Resistance
Terminations
The body and marking are resistant to all normal industrial
cleaning solvents suitable for printed circuits.
Material
Strength
Solderability
Solder coated copper.
The terminations meet the requirements of
IEC 68.2.21.
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
Flammability
The resistor coating will not burn under any condition of
applied temperature or component overload.
General Note
General
Note
Welwyn Components
reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All electronics
informationreserves
is subject
Welwyn’s
own
data and
is considered
accurate
at time
of going
to print.
TT
theto
right
to make
changes
in product
specification
without
notice
or liability.
TT electronics plc
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Issue D · 07.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
09. 11
99
Cement
Coated
Cement
Coated
Cement
Coated
Wirewound
Resistors
Wirewound
Resistors
Wirewound
W30
Series
W30 Series
W30 Series
Resistors
Welwyn Components
Welwyn Components
Performance Data
Performance Data
∆R%
∆R%
∆R%
Load: 1000 hrs 3 watts @ 25°C
Load:1000
1000
watts@@70°C
25°C
hrs hrs
2.5 3watts
1000
hrs
2.5
Dry heat:
1000
hrs
at watts
200°C@ 70°C
Dry heat: 1000 hrs at 200°C
Derating from room temperature
Derating from room temperature
Short term overload 10 x rated power for 5 seconds
Short term overload 10 x rated power for 5 seconds
Climatic
Climatic
Climatic category
Climatic category
Long term damp heat: 56 days
Long term damp heat: 56 days
Temperature rapid change
Temperature rapid change
Resistance to solder heat
Resistance to solder heat
Vibration and bump
Vibration and bump
Voltage proof
Voltage proof
Pulse handling
Pulse handling
Maximum
imum
5.0M+ax.001Ω
5.0
+
.001Ω
5.0 + .001Ω
∆R%
∆R%
∆R%
5.0++.001Ω
.001Ω
5.0
5.0 + .001Ω
∆R%
∆R%
∆R%
∆R%
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
volts
volts
3.0 + .001Ω
3.0 + .001Ω
2.0 + .001Ω
2.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
W31
W31Series
SeriesDerating
DeratingCurve
Curve
% of Rated Power at 70
% of Rated Power at 70
130
130
120
120
110
110
100
100
9090
8080
7070
6060
5050
4040
3030
2020
1010
00
2020 4040 6060 8080 100
100120
120140
140 160
160180
180 200
200220
220240
240 260
260280
280
Typical
T3.5
ypical
3.5
3.5
3.5
3.5
3.5
see derating curve
see derating curve
1.0
1.0
3.5
3.5
55/200/56
55/200/56
500 min
500 min
Data available by request
Data available by request
1.0
1.0
1.5
1.5
2.0
2.0
2.0
2.0
Application
Application Notes
Notes
The
Theterminations
terminationsshould
shouldnot
notbe
bebent
bentcloser
closerthan
than1.6mm
1.6mmfrom
from
the
body,
and
the
recommended
minimum
bend
radius
the body, and the recommended minimum bend radiusisis
1.2mm.
1.2mm.
Care
Caremust
mustbe
betaken
takenwhen
whendetermining
determiningclearance
clearancebetween
betweenthe
the
resistor
resistorbody
bodyand
andthe
theP.C.B.
P.C.B.ororother
othercomponents.
components.Resistance
Resistance
isismeasured
measured6mm
6mmfrom
frombody.
body.
Temp
Temp
10
10
Packaging
Packaging
Thestandard
standardmethod
methodofofpackaging
packagingisistaped
tapedininammo
ammopacks.
packs.
The
Canbe
beprovided
providedon
onreels
reelsbybyrequest.
request.
Can
W31resistors
resistorscan
canbe
besupplied
suppliedpreformed.
preformed.
W31
Contact
factory
for
details.
Contact factory for details.
f1f1
66
f2f2
63
63
–
f
1.4mm
mm
f
1
f1 – f2 2≤≤1.4
66
OrderingProcedure
Procedure
Ordering
Example:W31
W31atat11kilohms
kilohmsand
and1%
1%tolerance
tolerancepacked
packedininaabox
boxofof1000
1000pieces
pieces
Example:
W
3
1
–
1
W 3 1 – 1 KK00FFAA11
Type
Type
Value (use IEC62 code)
Value (use IEC62 code)
Tolerance (use IEC62 code)
Tolerance
F
1% (use IEC62 code)
FG 1%
2%
GJ 2%
5%
J
5%
Packing
Packing
A1
Ammo
A1
T1
T1
Ammo
Tape
Tape
1000/box
1000/box
1000/reel
1000/reel
Standard
Standard
© Welwyn
General
NoteComponents Limited Bedlington, Northumberland NE22 7AA, UK
(0) 1670
822181
· Facsimile:
+44
1670
829465 · Email:
info@welwyn-tt.com
©
Welwyn
Components
Bedlington,
Northumberland
NE22
7AA,
UKor liability. · Website: www.welwyn-tt.com
TTTelephone:
electronics+44
reserves
the right
toLimited
make
changes
in (0)
product
specification
without
notice
Issue D · 07.06
Issue D · 07.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
100 All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
100
© TT electronics plc
09. 11
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