Series Welwyn Components 0.25 watts Tolerance down ±0.5% 175

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Series Welwyn Components 0.25 watts Tolerance down ±0.5% 175

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Semi-Precision Power Wirewound Resistor
Series
Welwyn Components
0.25 watts Tolerance down ±0.5% 175K ohms Resistance wire 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 175K 1-90K 1-175K 0.1-90K 0.1-175K RW-69V/ RW79U 7.5K 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) 125°C 25°C Commercial Range (ohms) Min. Max. 1.0K 6.0K 7.5K Non-Inductive Range (ohms) Min. Max. 3.8K Available Resistance (ohms) 0.5%, 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 AS-1/2 less than 1MHz. order non-inductive types, prefix `N'. Example: NAS-1, NAS-2C, etc.
Typical inductance AS-1C <5ohms <1µH. 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 ±0.81 12.2 13.7 11.0 17.5 22.2 31.8 46.0 (max) (max) 10.9 15.2 16.6 15.1 20.6 24.9 35.0 49.2 0.64 (Lead Diameter) 0.64
Please note lead length dimension change following items only: AS-2B 33.0mm (min) AS-2C 33.0mm (min) Note: Coating marking resistant normal freon degreasing. Consult factory special requirements. marking available Alpha Numeric Colourbanding identification available.
1.50 min. (38.1)
Leads solder plated. AS-1C leads copper. others conductivity copper sheathed steel.
General Note
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's data considered accurate time going print. subsidiary electronics Issue 03.06
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Semi-Precision Power Wirewound Resistor
Series
Power Derating
AS-1/4, 1/2, Percent 125C Power Rating Spot Temperature AS-3, AS-2C AS-5, AS-2B AS-7 AS-2A, AS-1/2 AS-1/4
Welwyn Components
Temperature Rise 25°C
AS-7, AS-2A, AS-3, AS-5 AS-2B
Ambient Temperature
Percent Power Rating
Temperature Rise 125°C
AS-7, Spot Temperature (°C) AS-2 AS-2A, AS-1/2 AS-1/4
Selected Pulse-Handling Capability 125°C
AS-2A Energy (watts-second) AS-2 AS-3
AS-3, AS-5
AS-2B
AS-2B AS-2C AS-1
AS-1/2 AS-1/4 Resistance (ohms)
Percent 125°C Power Rating
Environmental Testing 25°C
Test Condition Load Life 1000 hours Moisture Resistance Temperature Cycle Short Time Overload Temperature Operation Solder Heat Shock Vibration 1.0% 1.0% 0.5% 0.5% 0.5% 0.25% 0.5% 0.5%
Packaging
Parts supplied taped reeled. Standard quantity reel.
Standard Quantities Package
1/4, 1/2, 2,000 1,000 1,000
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.06
Semi-Precision Power Wirewound Resistor
Series
Welwyn Components
Ordering Procedure
Specify type reference, value tolerance shown this example AS1/4 Type Resistance value (IEC62 code) Tolerance (IEC62 code)
AS1/4
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.06

Series Welwyn Components 0.25 watts Tolerance down ±0.5% 175

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