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| Semi-Precision Power Wirewound Resistor AS Series Welwyn Components * 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 AS-1/2 AS-1 AS-1C AS-2 AS-2B AS-2C AS-3 AS-5 AS-7 AS-10 RW68V/ RW78U RW74U/ RW67U 7 10 9 14 0.1 0.1 90K 175K 1.0 3.0 45K 50K 1-90K 1-175K 0.1-90K 0.1-175K RW-69V/ RW79U 3 2 3 5 4 3 5 7 0.1 0.1 0.1 0.1 24K 18K 30K 60K 0.5 0.2 0.5 0.8 12K 7.5K 15K 30K 1-24K 1-18K 1-30K 1-60K 0.1-24K 0.1-18K 0.1-30K 0.1-60K RW70U Equivalent MIL-R-26 Style RW81 Power Rating (watts) 125C 25C 0.5 0.5 1 1 2 1 1 2 2 3 Commercial Range (ohms) Min. Max. 0.1 0.1 0.1 .05 0.1 1.0K 6.0K 7.5K 2K 20K Non-Inductive Range (ohms) Min. Max. * * 0.1 * 0.5 * * 3.8K * 10K Available Resistance (ohms) 0.5%, 1% 3%, 5% 1-1K 1-6K 1-7.5K 1-2K 1-20K 0.1-1K 0.1-6K 0.1-7.5K .05-2K 0.1-20K 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 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 0.81 6.4 7.9 9.3 6.5 12.2 13.7 11.0 17.5 22.2 31.8 46.0 B (max) 2.4 2.4 3.2 2.9 6.3 5.6 4.0 7.2 8.8 8.8 9.8 C (max) 7.9 9.5 10.9 7.7 15.2 16.6 15.1 20.6 24.9 35.0 49.2 0.5 0.64 0.8 0.8 0.8 1.0 1.0 1.0 1.0 D (Lead Diameter) 0.5 0.5 0.64 0.8 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. 1.50 min. (38.1) D A B C * 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. A subsidiary of TT electronics plc Issue D * 03.06 (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 91 Semi-Precision Power Wirewound Resistor AS Series Power Derating 200 AS-1/4, 1/2, 1, 1C Percent of 125C Power Rating 175 Hot Spot Temperature (C) AS-3, 2 150 AS-2C AS-5, 10 125 AS-2B 100 AS-7 75 0 25 200 AS-2A, 2C 150 AS-1/2 100 AS-1/4 50 25 75 125 175 225 275 0 40 80 120 160 200 Welwyn Components Temperature Rise @ 25C 275 250 AS-7, 10 AS-2A, 2C AS-3, AS-5 AS-2B Ambient Temperature (C) Percent of 25C Power Rating Temperature Rise @ 125C 275 AS-7, 10 250 Hot Spot Temperature (C) AS-2 AS-2A, 2C AS-1/2 200 AS-1/4 Selected Pulse-Handling Capability @ 125C 14 AS-2A 12 Energy (watts-second) AS-2 AS-3 AS-3, AS-5 AS-2B 10 8 AS-2B 6 AS-2C 4 AS-1 2 0 0.1 150 125 0 AS-1/2 AS-1/4 0.2 0.5 1 2 Resistance (ohms) 5 10 40 80 120 160 200 Percent of 125C Power Rating Environmental Testing at 25C 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% Packaging Parts are supplied taped and reeled. Standard quantity per reel. Standard Quantities Per Package AS 1/4, 1/2, 1C AS 1, 2, 2B, 2C AS 3 AS 5, 7, 10 2,000 1,000 1,000 500 (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 Issue D * 03.06 Semi-Precision Power Wirewound Resistor AS Series Welwyn Components Ordering Procedure Specify type reference, value and tolerance as shown in this example of AS1/4 1K0 5%: Type Resistance value (IEC62 code) Tolerance (IEC62 code) F G J 1% 2% 5% AS1/4 1K0 J (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 |
Price & Availability of AS-1
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