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 @ 25°C
275
250
AS-7, 10
AS-2A, 2C
AS-3, AS-5
AS-2B
Ambient Temperature (C)
Percent of 25C Power Rating
Temperature Rise @ 125°C
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 @ 125°C
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 125°C Power Rating
Environmental Testing at 25°C
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
© 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
WELWYN [ WELWYN COMPONENTS LIMITED ]
