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 plc
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
AS Series
• 1/4 watt to 10 watts
• 0.1 ohm to 175K ohms
• ±5%, ±3%, ±1%, ±.5% tolerance
• Resistance wire TCR ±20 ppm/°C
• RoHS-compliant version available
Alloy resistance wirewound
to specific parameters
including TCR’s from
All welded
cap and lead
Heat conducting
ceramic
Silicone
conformal coating
AlphaDigital
Marking
Semi-Precision Power
Wirewound Resistor
Electrical Data
IRC Type
Similar
MIL-R-26
Style
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%
AS-1/4
RW81
0.5 1 0.1 1.0K * * 1-1K 0.1-1K
AS-1/2
0.5 1 0.1 6.0K * * 1-6K 0.1-6K
AS-1
RW70U
1 2 0.1 7.5K 0.1 3.8K 1-7.5K 0.1-7.5K
AS-1C
1 2 .05 2K * * 1-2K .05-2K
AS-2
RW79U
2 3 0.1 20K 0.5 10K 1-20K 0.1-20K
AS-2B
3 4 0.1 24K 0.5 12K 1-24K 0.1-24K
AS-2C
2 3 0.1 18K 0.2 7.5K 1-18K 0.1-18K
AS-3
3 5 0.1 30K 0.5 15K 1-30K 0.1-30K
AS-5
RW74U/
5 7 0.1 60K 0.8 30K 1-60K 0.1-60K
AS-7
7 9 0.1 90K 1.0 45K 1-90K 0.1-90K
AS-10
RW78U
10 14 0.1 175K 3.0 50K 1-175K 0.1-175K
Inductance of AS-1/2 is less than 1µH at 1MHz.
To order non-inductive types, add the prefix "N". Example: NAS-1, NAS-2C, etc.
*Typical inductance of AS-1C <5 ohms is <1µH.
Lower values available upon request.
AS Series Issue August 2008 Sheet 1 of 3
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Semi-Precision Power
Wirewound Resistor
Physical Data
IRC Type A±0.032 B (max) C (max) D (Lead Diameter)
AS-1/4
0.250 (6.4) 0.094 (2.4) 0.312 (7.9) 0.020 (0.5)
AS-1/2
0.312 (7.9) 0.094 (2.4) 0.375 (9.5) 0.020 (0.5)
AS-1
0.367 (9.3) 0.125 (3.2) 0.429 (10.9) 0.020 (0.5) 0.025 (0.64)
AS-1C
0.256 (6.5) 0.115 (2.9) 0.303 (7.7) 0.025 (0.64) 0.032 (0.8)
AS-2
0.480 (12.2) 0.250 (6.3) 0.600 (15.2) 0.032 (0.8)
AS-2B
0.540 (13.7) 0.219 (5.6) 0.663 (16.6) 0.032 (0.8)
AS-2C
0.489 (11.0) 0.157 (4.0) 0.594 (15.1) 0.032 (0.8)
AS-3
0.687 (17.5) 0.282 (7.2) 0.812 (20.6) 0.040 (1.0)
AS-5
0.875 (22.2) 0.344 (8.8) 0.980 (24.9) 0.040 (1.0)
AS-7
1.250 (31.8) 0.344 (8.8) 1.375 (35.0) 0.040 (1.0)
AS-10
1.812 (46.0) 0.385 (9.8) 1.937 (49.2) 0.040 (1.0)
A
C
1.50 MIN.
(38.1)
B
D
AS Series Issue August 2008 Sheet 2 of 3
Please note lead length dimension
change on the following two items only:
AS-2B 1.3 min.
AS-2C 1.3 min.
NOTE:
• Coating and marking is resistant to normal degreasing.
Consult factory for special requirements.
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Semi-Precision Power
Wirewound Resistor
Sample Part No.
IRC Type
AS
Power
3 = 3 watts
(See specification chart for other power ratings)
Resistance Value
(100 ohms and greater - First 3 significant digits plus 4th digit multiplier)
Example: 100 ohms = 1000, 1000 ohms = 1001, 150,000 ohms = 1503
(Less than 100 ohms - "R" is used to designate decimal)
Example: 51 ohms = 51R0, 1 ohm = 1R00, 0.25 ohms = R250
Tolerance
J = ±5%; H = ±3%; F = ±1%; D = ±0.5%
Lead Free Construction
Ordering Data
AS - 3 27R0 F LF
AS Series Issue August 2008 Sheet 3 of 3
Test Condition
Max ∆R
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%
Environmental Testing at 25°C
Power Derating Curve
Selected Pulse-Handling
Capability @ 125°C
Ambient Temperature (°C)
25 75 125 175 225 275
200
175
150
125
100
75
0
Percent of 125°C Power Rating
AS- 1/4, 1/2, 1, 1C
AS- 3, 2
AS- 2C
AS- 5, 10
AS- 7
AS- 2B
Resistance (ohms)
0.1 0.2 0.5 1 2 5 10
14
12
10
8
6
4
2
0
Energy (watts-second)
AS- 2A
AS- 3
AS- 2
AS- 2B
AS- 2C
AS- 1
AS- 1/2
AS- 1/4
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