Resistors
Low Cost Semi-Precision
Power Wirewound Resistor
Low Cost Semi-Precision
LAS Series
Power Wirewound Resistor
1 and 3 watts
0.1 ohm
LAS Series
to 18K ohms
•
1
Color
watts
identification
and 3
band
•
0.1 ohm to 18K ohms
±5%, ±3%, ±1%, ±.5% tolerance
•
Color band identification
Resistance wire TCR ±20 ppm/°C
•
±5%, ±3%, ±1%, ±.5% tolerance
RoHS-compliant version available
•
Resistance wire TCR ±20 ppm/°C
•
RoHS-compliant version available
½llo½ resistance wirewound
to speci½ic parameters includin½
TCR½s ½rom ±20 to ½5500 ppm/°C
½ll welded
cap and lead
Colorband
½ar½in½
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Heat conductin½
ceramic substrate
Silicone
con½ormal coatin½
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 L½S-3 is a three watt con½ormal coated precision wirewound resistor. The resistance wire is welded to the end caps and
wound on alumina rod ½or ½ood thermal conductivit½. In circuit applications that utilize two watt carbon comp resistors the L½S-3
is an idead e½½ective replacement. The L½S-3 5.6 ohm can be specificall½ desi½ned to withstand 22 jooules o½ ener½½ delivered
b½ a 1000 volt 10 x 1000 usec wave shape pulse.
LIGHTNING SURGE
Special L½S-3 5.6 ohm to 100 ohm will meet
Telecom GR-1089 li½htnin½ requirements.
•
•
•
•
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
T2
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.
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
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
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
to print.
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
http://www.ttelectronics.com/resistors
LAS Series Issue October 2008 Sheet 1 of 3
© TT Electronics plc
04.17
Low Cost Semi-Precision
Power Wirewound Resistor
LAS Series
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
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
04.17
Low Cost Semi-Precision
Power Wirewound Resistor
LAS Series
Low Cost Semi-Precision
Power Wirewound Resistor
Power Derating Curve
200
Percent of 125°C Power Rating
LAS3
Pulse-Handling Capability @ 25°C
14
Energy (watts-second)
12
10
8
6
LAS1
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
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
04.17
PCB Design
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