Semi-Precision Power
Wirewound Resistor
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
Alpha-
Digital
Marking
Silicone
conformal coating
Heat conducting
ceramic
Electrical Data
IRC Type
Similar
MIL-R-26
Style
Power Rating 275°C
Max. Hot Spot
125°C
0.5
0.5
RW70U
1
1
RW79U
2
3
2
3
RW74U/
5
7
RW78U
10
25°C
1
1
2
2
3
4
3
5
7
9
14
Commercial Range
(ohms)
Min.
0.1
0.1
0.1
.05
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Max.
1.0K
6.0K
7.5K
2K
20K
24K
18K
30K
60K
90K
175K
Non-Inductive
Range
(ohms)
Min.
*
*
0.1
*
0.5
0.5
0.2
0.5
0.8
1.0
3.0
Max.
*
*
3.8K
*
10K
12K
7.5K
15K
30K
45K
50K
Available Resistance
(ohms)
0.5%, 1%
1-1K
1-6K
1-7.5K
1-2K
1-20K
1-24K
1-18K
1-30K
1-60K
1-90K
1-175K
3%, 5%
0.1-1K
0.1-6K
0.1-7.5K
.05-2K
0.1-20K
0.1-24K
0.1-18K
0.1-30K
0.1-60K
0.1-90K
0.1-175K
AS-1/4
AS-1/2
AS-1
AS-1C
AS-2
AS-2B
AS-2C
AS-3
AS-5
AS-7
AS-10
RW81
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.
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.
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
AS Series Issue August 2008 Sheet 1 of 3
Semi-Precision Power
Wirewound Resistor
Physical Data
NOTE:
• Coating and marking is resistant to normal degreasing.
Consult factory for special requirements.
1.50 MIN.
(38.1)
B
A
Please note lead length dimension
change on the following two items only:
AS-2B 1.3 min.
AS-2C 1.3 min.
D
C
IRC Type
AS-1/4
AS-1/2
AS-1
AS-1C
AS-2
AS-2B
AS-2C
AS-3
AS-5
AS-7
AS-10
A±0.032
0.250 (6.4)
0.312 (7.9)
0.367 (9.3)
0.256 (6.5)
0.480 (12.2)
0.540 (13.7)
0.489 (11.0)
0.687 (17.5)
0.875 (22.2)
1.250 (31.8)
1.812 (46.0)
B (max)
0.094 (2.4)
0.094 (2.4)
0.125 (3.2)
0.115 (2.9)
0.250 (6.3)
0.219 (5.6)
0.157 (4.0)
0.282 (7.2)
0.344 (8.8)
0.344 (8.8)
0.385 (9.8)
C (max)
0.312 (7.9)
0.375 (9.5)
0.429 (10.9)
0.303 (7.7)
0.600 (15.2)
0.663 (16.6)
0.594 (15.1)
0.812 (20.6)
0.980 (24.9)
1.375 (35.0)
1.937 (49.2)
D (Lead Diameter)
0.020 (0.5)
0.020 (0.5)
0.020 (0.5) 0.025 (0.64)
0.025 (0.64) 0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
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
AS Series Issue August 2008 Sheet 2 of 3
Semi-Precision Power
Wirewound Resistor
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%
Power Derating Curve
Percent of 125°C Power Rating
200
175
150
125
AS- 2B
AS- 1/4, 1/2, 1, 1C
AS- 3, 2
AS- 2C
AS- 5, 10
100
75
0
25
75
AS- 7
125
175
225
275
Ambient Temperature (°C)
Selected Pulse-Handling
Capability @ 125°C
14
Energy (watts-second)
12
10
8
AS- 2B
Ordering Data
Sample Part No.
IRC Type
AS
AS - 3
27R0
F
LF
AS- 2A
AS- 2
Power
AS- 3
3 = 3 watts
(See specification chart for other power ratings)
Resistance Value
6
AS- 2C
(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
4
AS- 1
Tolerance
J = ±5%; H = ±3%; F = ±1%; D = ±0.5%
2
0
0.1
AS- 1/2
AS- 1/4
Lead Free Construction
0.2
0.5
1
2
5
10
Resistance (ohms)
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
AS Series Issue August 2008 Sheet 3 of 3
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