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)
125°C
25°C
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 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
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
© 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
WELWYN [ WELWYN COMPONENTS LIMITED ]
