Semi-Precision Power Wirewound Resistor Alloy resistance wirewound to specific parameters including TCR’s from AS Series • 1/4 watt to 10 watts AlphaDigital Marking All welded cap and lead • 0.1 ohm to 175K ohms • ±5%, ±3%, ±1%, ±.5% tolerance • Resistance wire TCR ±20 ppm/°C Silicone conformal coating • RoHS-compliant version available Heat conducting ceramic 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% 0.5 1 0.1 1.0K * * 1-1K 0.1-1K 0.5 1 0.1 6.0K * * 1-6K 0.1-6K 1 2 0.1 7.5K 0.1 3.8K 1-7.5K 0.1-7.5K 1 2 .05 2K * * 1-2K .05-2K 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 5 7 0.1 60K 0.8 30K 1-60K 0.1-60K 7 9 0.1 90K 1.0 45K 1-90K 0.1-90K 10 14 0.1 175K 3.0 50K 1-175K 0.1-175K AS-1/4 RW81 AS-1/2 AS-1 RW70U AS-1C AS-2 AS-5 RW79U RW74U/ AS-7 AS-10 RW78U 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. B 1.50 MIN. (38.1) A D Please note lead length dimension change on the following two items only: AS-2B 1.3 min. AS-2C 1.3 min. IRC Type C 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) 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 Max ∆R Test Condition 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% Selected Pulse-Handling Capability @ 125°C Energy (watts-second) 200 AS- 1/4, 1/2, 1, 1C 175 AS- 3, 2 150 AS- 2C AS- 5, 10 125 AS- 2B 100 AS- 7 75 0 25 75 125 175 225 275 Ambient Temperature (°C) Ordering Data Sample Part No. AS - 3 27R0 F LF IRC Type 14 AS AS- 2A 12 10 Power Derating Curve Percent of 125°C Power Rating Environmental Testing at 25°C Power 3 = 3 watts (See specification chart for other power ratings) AS- 3 AS- 2 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 8 AS- 2B 6 AS- 2C Tolerance 4 J = ±5%; H = ±3%; F = ±1%; D = ±0.5% AS- 1 2 0 0.1 AS- 1/2 Lead Free Construction AS- 1/4 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