Resistors
Make Possible
Low Cost Semi-Precision
Power
Wirewound
Resistor
Low Cost
Semi-Precision
Power Wirewound Resistor
LAS Series
1 and 3 watts
ohm to 18K ohms
0.1Series
LAS
band identification
• 1 Color
and 3 watts
• 0.1
ohm
to 18K
ohms
±1%,
±.5% tolerance
±5%, ±3%,
• Color band identification
Resistance wire TCR ±20 ppm/°C
• ±5%, ±3%, ±1%, ±.5% tolerance
RoHS-compliant
available
• Resistance
wire TCRversion
±20 ppm/°C
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• RoHS-compliant version available
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
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Electrical Data
IRC
Type
Power Rating 275°C
Max. Hot Spot
Commercial Range
(ohms)
Non-Inductive Range
(ohms)
Available Resistance
(ohms)
125°C
25°C
Min.
Max.
Min.
Max.
0.5%, 1%
3%, 5%
LAS-1
1
2
0.1
7.5K
0.1
3.8K
1 - 7.5K
0.1 - 7.5K
LAS-3
2
3
0.1
18K
0.2
7.5K
1 - 18K
0.1 - 18K
Environmental Data
Max ∆R
Test Condition (@ 25°C)
Load Life 1000 hours
1.0%
Moisture Resistance
1.0%
Temperature Cycle
0.5%
Short Time Overload
0.5%
Low Temperature Operation
0.5%
Solder Heat
0.25%
Shock
0.5%
Vibration
0.5%
LAS-3 Carbon Comp Replacement (contact factory)
The LAS-3 is a three watt conformal coated precision wirewound resistor. The resistance wire is welded to the end caps and
wound on alumina rod for good thermal conductivity. In circuit applications that utilize two watt carbon comp resistors the LAS-3
is an idead effective replacement. The LAS-3 5.6 ohm can be specifically designed to withstand 22 jooules of energy delivered
by a 1000 volt 10 x 1000 usec wave shape pulse.
LIGHTNING SURGE
Special LAS-3 5.6 ohm to 100 ohm will meet
Telecom GR-1089 lightning requirements.
•
•
•
•
V = 1000 volts
T1 = 10 usec rise
T2 = 1000 usec to V2
10 ohm output impedance
V
V2
0
T2
T1
MICROSECONDS
General Note
IRC
reserves the
right to make changes in product specification without notice or liability.
General
Note
All information is subject to IRC’s own data and is considered accurate at time of going to print.
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information
is Technologies
subject to TT Electronics’
own
dataSouth
andStaples
is considered
accurate
atTexas
time78411
of going
Wire
and Film
Division
• 4222
Street • Corpus
Christi
USA to print.
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
www.ttelectronicsresistors.com
LAS Series
Issue October 2008 Sheet 1 of 3
© TT Electronics plc
07.14
Low Cost Semi-Precision
Power Wirewound Resistor
Low Cost Semi-Precision
Power Wirewound Resistor
Make Possible
LAS Series
Physical Data
B
E
A
D
C
Dimensions (Inches (mm))
IRC
Type
A ±0.032
B (max)
C (max)
D (Lead Diameter)
E (Lead length Min)
LAS-1
0.348 (8.84)
0.110 (2.80)
0.407 (10.34)
0.020 (0.53)
1.475 (37.5)
LAS-3
0.491 (12.47)
0.149 (3.80)
0.550 (13.99)
0.032 (0.81)
1.35 (34.3)
Hot Spot Temperature @ 25°C
Hot Spot Temperature @ 125°C
275
250
Hot Spot Temperature (°C)
Hot Spot Temperature (°C)
275
LAS3
200
LAS1
150
100
50
25
250
LAS1
200
175
150
125
0
40
80
120
160
200
Percent of 25°C Power
Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
LAS3
225
0
20
40
60
80
100
Percent of 125°C Power Rating
LAS Series Issue October 2008 Sheet 2 of 3
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
www.ttelectronicsresistors.com
© TT Electronics plc
07.14
Low Cost Semi-Precision
Power Wirewound Resistor
Low Cost Semi-Precision
Power Wirewound Resistor
Make Possible
LAS Series
Pulse-Handling Capability @ 25°C
Power Derating Curve
200
Percent of 125°C Power Rating
Energy (watts-second)
14
12
LAS3
10
8
6
LAS1
4
2
0
0.1
0.2
0.5
1
2
5
10
175
LAS1
150
LAS3
125
100
75
25
Resistance (ohms)
75
125
175
225
275
Ambient Temperature (°C)
Ordering Data
Sample Part No.
LAS - 3
2001
J
LF
Type
LAS
Power
3 = 3 watts
1 = 1 watt
Resistance Value
Expressed in ohms
(Standard EIA/MIL Values)
Tolerance
J = ±5%, H = ±3%, F = ±1%, D = ±0.5%
Lead-Free Construction
Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
LAS Series Issue October 2008 Sheet 3 of 3
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
www.ttelectronicsresistors.com
© TT Electronics plc
07.14