Low Cost Semi-Precision
Power Wirewound Resistor
LAS Series
•
•
•
•
•
•
1 and 3 watts
0.1 ohm to 18K ohms
Color band identification
±5%, ±3%, ±1%, ±.5% tolerance
Resistance wire TCR ±20 ppm/°C
RoHS-compliant version available
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Electrical Data
IRC
Type
LAS-1
LAS-3
Power Rating 275°C
Max. Hot Spot
125°C
1
2
25°C
2
3
Commercial Range
(ohms)
Min.
0.1
0.1
Max.
7.5K
18K
Non-Inductive Range
(ohms)
Min.
0.1
0.2
Max.
3.8K
7.5K
Available Resistance
(ohms)
0.5%, 1%
1 - 7.5K
1 - 18K
3%, 5%
0.1 - 7.5K
0.1 - 18K
Environmental Data
Test Condition (@ 25°C)
Load Life 1000 hours
Moisture Resistance
Temperature Cycle
Short Time Overload
Low Temperature Operation
Solder Heat
Shock
Vibration
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.
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•
•
•
V = 1000 volts
T1 = 10 usec rise
T2 = 1000 usec to V2
10 ohm output impedance
V
Max
∆R
1.0%
1.0%
0.5%
0.5%
0.5%
0.25%
0.5%
0.5%
V2
0 T1
MICROSECONDS
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
T2
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
A subsidiary of
TT electronics plc
LAS Series Issue October 2008 Sheet 1 of 3
Low Cost Semi-Precision
Power Wirewound Resistor
Physical Data
B
E
A
D
C
Dimensions (Inches (mm))
IRC
Type
LAS-1
LAS-3
A ±0.032
0.348 (8.84)
0.491 (12.47)
B (max)
0.110 (2.80)
0.149 (3.80)
C (max)
0.407 (10.34)
0.550 (13.99)
D (Lead Diameter)
0.020 (0.53)
0.032 (0.81)
E (Lead length Min)
1.475 (37.5)
1.35 (34.3)
Hot Spot Temperature @ 25°C
275
Hot Spot Temperature (°C)
250
LAS3
Hot Spot Temperature @ 125°C
275
Hot Spot Temperature (°C)
250
225
200
175
150
125
0
20
40
60
80
100
LAS3
LAS1
200
150
100
50
25
0
40
80
120
LAS1
160
200
Percent of 25°C Power
Percent of 125°C Power Rating
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 2 of 3
Low Cost Semi-Precision
Power Wirewound Resistor
Pulse-Handling Capability @ 25°C
14
Energy (watts-second)
12
10
8
6
LAS1
LAS3
Power Derating Curve
200
Percent of 125°C Power Rating
175
LAS1
150
LAS3
125
100
75
4
2
0
0.1
0.2
0.5
1
2
5
10
25
75
125
175
225
275
Resistance (ohms)
Ambient Temperature (°C)
Ordering Data
Sample Part No.
Type
LAS
LAS - 3
2001
J
LF
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
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