Semi-Precision Power Wirewound Resistor Welwyn Components AS Series * 0.25 to 10 watts * Tolerance down to 0.5% * 0.1 ohm to 175K ohms * Resistance wire TCR 20 ppm/C Electrical Data Type AS-1/4 Equivalent MIL-R-26 Style RW81 AS-1/2 AS-1 RW70U Power Rating (watts) 125C 25C Commercial Range (ohms) Min. Max. Non-Inductive Range (ohms) Min. Max. Available Resistance (ohms) 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 0.1-7.5K 1 2 0.1 7.5K 0.1 3.8K 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-1C AS-2 RW-69V/ RW79U AS-5 RW74U/ RW67U AS-7 AS-10 RW68V/ RW78U Inductance of AS-1/2 is less than 1H at 1MHz. To order non-inductive types, add the prefix `N'. Example: NAS-1, NAS-2C, etc. * Typical inductance of AS-1C <5ohms is <1H. Lower values available upon request. Physical Data Dimensions (mm) Type A 0.81 B (max) C (max) D (Lead Diameter) AS-1/4 6.4 2.4 7.9 0.5 AS-1/2 7.9 2.4 9.5 AS-1 9.3 3.2 10.9 0.5 0.64 AS-1C 6.5 2.9 7.7 0.64 0.8 AS-2 12.2 6.3 15.2 0.8 AS-2B 13.7 5.6 16.6 0.8 AS-2C 11.0 4.0 15.1 0.8 AS-3 17.5 7.2 20.6 1.0 AS-5 22.2 8.8 24.9 1.0 AS-7 31.8 8.8 35.0 1.0 AS-10 46.0 9.8 49.2 1.0 1.50 min. (38.1) A D 0.5 B C Please note lead length dimension change on the following two items only: AS-2B 33.0mm (min) AS-2C 33.0mm (min) Note: * Coating and marking is resistant to normal freon degreasing. Consult factory for special requirements. * AS marking available in Alpha Numeric or Colourbanding identification available. * Leads are solder plated. AS-1C leads are copper. All others are 40% conductivity copper sheathed steel. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com A subsidiary of TT electronics plc Issue D * 03.06 91 Semi-Precision Power Wirewound Resistor Welwyn Components AS Series Power Derating Temperature Rise @ 25C 275 200 175 AS-3, 2 150 AS-2C AS-5, 10 125 AS-2B 100 AS-2A, 2C AS-3, AS-5 Hot Spot Temperature (C) Percent of 125C Power Rating AS-7, 10 250 AS-1/4, 1/2, 1, 1C AS-7 75 200 AS-2B AS-2A, 2C 150 AS-1/2 100 AS-1/4 50 25 0 25 75 125 175 225 0 275 40 Temperature Rise @ 125C 120 160 200 Selected Pulse-Handling Capability @ 125C 275 14 AS-7, 10 AS-2A AS-3, AS-5 AS-2B AS-2 AS-2A, 2C AS-1/2 200 AS-1/4 10 AS-3 AS-2 8 AS-2B 6 AS-2C 4 AS-1 150 125 0 Energy (watts-second) 12 250 Hot Spot Temperature (C) 80 Percent of 25C Power Rating Ambient Temperature (C) 2 40 80 120 160 Percent of 125C Power Rating 200 0 0.1 AS-1/2 AS-1/4 0.2 0.5 1 2 Resistance (ohms) 5 10 Environmental Testing at 25C 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% (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 92 Max R Issue D * 03.06 Semi-Precision Power Wirewound Resistor Welwyn Components AS Series Ordering Procedure Example: AS1/4 at 1 kilohm and 5% tolerance on a reel of 2000 pieces AS1/4-1K0JI Winding N Standard Non-inductive Type Value (use IEC62 code) Tolerance (use IEC62 code) D F 0.5% 1% Packing I Tape H J 3% 5% AS1/4, 1/2, 1C AS1, 2, 2B, 2C, 3 AS5, 7, 10 2000/reel 1000/reel 500/reel Standard (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Issue D * 03.06