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
Commercial Range
(ohms)
Min.
Max.
Non-Inductive Range
(ohms)
Min.
Max.
Available Resistance
(ohms)
0.5%, 1%
3%, 5%
RW70U
0.5
1
0.1
1.0K
*
*
1-1K
0.1-1K
0.5
AS-1/2
AS-1
Power Rating
(watts)
125°C
25°C
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 1µH at 1MHz.
To order non-inductive types, add the prefix ‘N’. Example: NAS-1, NAS-2C, etc.
* Typical inductance of AS-1C <5ohms is <1µH.
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.
© 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
