LAS SERIES
LOW COST SEMI-PRECISION
POWER WIREWOUND RESISTOR
Alloy resistance wire
wound
to specific parameters
including TCR's from
Colorband
Marking
•
•
•
•
•
•
1 and 3 watts
±5%, ±3%, ±1%, ±.5% tolerance
0.1 ohm to 18K ohms
Resistance wire TCR ±20 ppm/°C
RoHS-compliant version available
Color band identification
All welded
cap
and lead
Silicone
conformal
coating
Heat conducting
ceramic substrate
SPECIFICATIONS:
Power Rating 275°C
Max. Hot Spot
IRC Type
Commercial Range
(ohms)
Min.
Non-Inductive Range
(ohms)
Min.
Available Resistance
(ohms)
0.5%, 1%
LAS-1
LAS-3
125°C
1
2
25°C
2
3
0.1
0.1
7.5K
18K
Max.
0.1
0.2
3.8K
7.5K
Max.
1-7.5K
1-18K
0.1-7.5K
0.1-18K
3%, 5%
LAS DIMENSIONS (Inches and (mm)):
E
IRC Type
LAS-1
LAS-3
0.348 (8.84)
0.491 (12.47)
A±0.032
0.110 (2.80)
0.149 (3.80)
B (max)
0.407 (10.34)
0.550 (13.99)
C (max)
D (Lead Diameter)
E (Lead Length Min)
0.020 (0.53)
0.032 (0.81)
1.475 (37.5)
1.35 (34.3)
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 ideal effective replacement. The LAS-3 5.6 ohm can be specifically
designed to withstand 22 joules of energy delivered by a 1000 volt 10x1000 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
T1
MICROSECONDS
T2
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.
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
A subsidiary of TT electronics
1005
POWER DERATING:
200
Percent of 125°C Power Rating
175
150
LAS-3
125
100
75
LAS-1
HOT SPOT TEMPERATURE @ 25°C:
275
250
Hot Spot Temperature (°C)
LAS3
200
LAS1
150
100
50
25
0
25
75
125
175
225
Ambient Temperature (°C)
275
0
40
80
120
160
200
Percent of 25°C Power
HOT SPOT TEMPERATURE @ 125°C:
275
250
PULSE-HANDLING CAPABILITY @ 25°C:
14
12
Energy (watts-second)
Hot Spot Temperature (°C)
LAS3
225
LAS3
10
8
6
4
2
LAS1
200
175
150
125
LAS1
0
20
40
60
80
100
0
Percent of 125°C Power Rating
0.1
0.2
0.5
1
2
Resistance (ohms)
5
10
HOW TO ORDER:
Sample Part No.:
ENVIRONMENTAL TESTING AT 25°C:
TEST CONDITION
Load Life 1000 hours
Moisture Resistance
Temperature Cycle
Short Time Overload
Low Temperature Operation
Solder Heat
Shock
Vibration
MAX
∆R
1.0%
1.0%
0.5%
0.5%
0.5%
0.25%
0.5%
0.5%
Type
Power
3 =3 watts
1=1 watt
LAS-3 27R0 5% LF
Resistance Value
Expressed in ohms
(Standard EIA/MIL Values)
Tolerance
±5%, ±3%, ±1%, ±0.5%
Lead Free Construction
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.
A subsidiary of TT electronics
1005
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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