Datasheet AS-1-4, AS-1-2, AS-1, AS-1C, AS-2 Datasheet (TT electronics)

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: [phone] • 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: [phone] • 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: [phone] • 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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