Semi-Precision Power
Semi-Precision
Power
Semi-Precision
Power
Wirewound Resistor
Wirewound Resistor
Wirewound Resistor
AS Series
AS Series
AS Series
•
to 10
to 10
0.25
0.25
watts
watts
•
0.25 to 10 watts
•
Tolerance down to ±0.5%
Tolerance down to ±0.5%
•
Tolerance down to ±0.5%
0.1 ohm
ohm to 175K ohms
•
0.1
to 175K ohms
•
0.1 ohm to
wire TCR ±20 ppm/°C
Resistance
175K ohms ±20 ppm/°C
•
Resistance wire TCR
•
Resistance wire TCR ±20 ppm/°C
Welwyn Components
Welwyn Components
·
·
·
·
Electrical Data
Electrical Data
Equivalent
Power Rating
Commercial Range
Non-Inductive Range
Available Resistance
Equivalent
Power Rating
Commercial Range
Non-Inductive(ohms)
Range
Available Resistance
MIL-R-26
(watts)
(ohms)
(ohms)
(watts)
(ohms)
(ohms)
(ohms)
Type MIL-R-26Style
125°C
25°C
Min.
Max.
Min.
Max.
0.5%, 1%
3%, 5%
Type AS-
1
/
4
Style
RW81
125°C
0.5
25°C
Min.
0.1
Max.
1.0K
Min.
1
*
Max.
*
0.5%, 1%
1-1K
3%, 5%
0.1-1K
AS-
1
/
4
AS-
1
/
2
RW81
0.5
1
0.1
*
*
1-1K 1-6K 0.1-1K 0.1-6K
0.5
1
0.1 1.0K 6.0K
*
*
AS-
1
/
2
AS-1
1
0.1
*
*
RW70U 0.5
1
2
0.1 6.0K 7.5K
0.1
3.8K 1-6K 1-7.5K0.1-6K0.1-7.5K
AS-1
AS-1C
RW70U
1
1
2
3
3
2
RW74U/ 3
RW74U/
RW67U 5
RW67U
RW68V/ 7
RW68V/
RW78U 10
RW78U
2
3
5
7
10
9
14
4
3
5
7
9
14
0.1
0.1
2
2
3
4
3
5
7
0.1
0.1
0.1
0.1
0.1
0.1
90K
175K
2
3
0.1
.05
0.1
0.1
0.1
0.1
0.1
24K
18K
30K
60K
90K
175K
1.0
3.0
.05
0.1
7.5K
2K
20K
24K
18K
30K
60K
0.5
0.2
0.5
0.8
1.0
3.0
45K
50K
2K
20K
0.1
*
0.5
0.5
0.2
0.5
0.8
12K
7.5K
15K
30K
45K
50K
*
0.5
3.8K
*
10K
AS-1C AS-2
AS-2
AS-2B AS-2C
AS-2C AS-3
AS-3
AS-5
AS-7
AS-7
AS-10
RW-69V/ 1
RW-69V/
RW79U 2
1-7.5K 1-2K0.1-7.5K.05-2K
10K 1-2K 1-20K .05-2K0.1-20K
1-20K
0.1-20K
*
1-24K
0.1-24K
1-24K 1-18K0.1-24K
7.5K
0.1-18K
15K 1-18K 1-30K0.1-18K
0.1-30K
30K
1-30K 1-60K0.1-30K
0.1-60K
1-60K
0.1-60K
1-90K
0.1-90K
1-90K 1-175K
0.1-90K
0.1-175K
1-175K
0.1-175K
12K
AS-2B
RW79U
AS-5
AS-10
Inductance of AS-1/2 is less than 1µH at 1MHz.
* Typical inductance of AS-1C <5ohms is <1µH.
Inductance of AS-1/2 is less than 1µH atthe prefix ‘N’. Example: NAS-1, NAS-2C, * Typical inductance available upon request.
To order non-inductive types, add 1MHz.
etc. Lower values of AS-1C <5ohms is <1µH.
To order non-inductive types, add the prefix ‘N’. Example: NAS-1, NAS-2C, etc. Lower values available upon request.
Physical Data
Physical Data
Dimensions (mm)
AS-
1
/
2
AS-1
AS-1 AS-1C
AS-1C AS-2
AS-2 AS-2B
AS-2B AS-2C
AS-2C AS-3
AS-3
AS-5
AS-7
AS-10
AS-5
AS-7
AS-10
7.9
9.3
6.5
12.2
13.7
11.0
17.5
22.2
31.8
46.0
9.3
6.5
12.2
13.7
11.0
17.5
22.2
31.8
46.0
Dimensions (mm)
Type
A ±0.81
B (max)
C (max)
D (Lead Diameter)
Type
AS-
1
/
4
A ±0.81 6.4 B (max) 2.4 C (max) 7.9 D (Lead Diameter)
0.5
AS-
1
/
4
AS-
1
/
2
6.4
2.4
7.9
0.5
7.9
2.4
9.5
0.5
2.4
3.2
2.9
6.3
5.6
4.0
7.2
8.8
8.8
9.8
3.2
2.9
6.3
5.6
4.0
7.2
8.8
8.8
9.8
9.5
10.9
7.7
15.2
16.6
15.1
20.6
24.9
35.0
49.2
10.9
7.7
15.2
16.6
15.1
20.6
24.9
35.0
49.2
0.5
0.5
0.5
0.64
0.64
0.64
0.8
0.8
0.8
1.0
1.0
1.0
1.0
0.80.8
0.8
0.8
1.0
1.0
1.0
1.0
0.64
0.8
D
1.50 min.
(38.1)
1.50 min.
A
D(38.1)
C
A
B
C
B
Please note lead length dimension change on the following
two items only:
Please note lead length dimension change on the following
AS-2B
two items only: 33.0mm (min)
AS-2C (min)
AS-2B 33.0mm 33.0mm (min)
Note:
AS-2C 33.0mm (min)
Note: • Coating and marking is resistant to normal freon
• Coating degreasing. is resistant to normal freon
and marking
Consult factory for special requirements.
degreasing.
• AS marking available in Alpha Numeric or Colourbanding -
Consult factory for special requirements.
identification available.
• 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.
* Leads are solder plated. AS-1C leads are copper. All others are 40% conductivity copper sheathed steel.
General Note
Welwyn
General Note
Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject right
data and is considered accurate at time of going to print.
Welwyn Components
the right to
to Welwyn’s own
product
product specification without
liability.
TT electronics reserves
reserves the
make
to make changes in
specification without notice or
notice or liability.
changes in
TT electronics plc
A subsidiary of
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
All information is subject
Components Limited
and is considered accurate at time of
7AA, UK
print.
© Welwyn
to TT electronics’ own data
· Bedlington, Northumberland NE22
going to
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Issue D · 03.06
Telephone: +44 (0) 1670 822181 Bedlington, Northumberland NE22 7AA, UK
© Welwyn Components Limited
· ·Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
Issue D · 03.06
10. 11
91
91
Semi-Precision Power
Semi-Precision Power
Wirewound Resistor
Wirewound Resistor
AS Series
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
125
AS-2B
100
75
0
25
AS-7
AS-2C
AS-5, 10
200
AS-2A, 2C
150
100
Welwyn Components
Temperature Rise @ 25°C
275
250
AS-7, 10
AS-3, AS-5
AS-2A, 2C
AS-2B
AS-1/2
AS-1/4
50
25
75
125
175
225
275
0
40
80
120
160
200
Ambient Temperature (C)
Percent of 25C Power Rating
Temperature Rise @ 125°C
275
AS-7, 10
250
Hot Spot Temperature (°C)
AS-3, AS-5
AS-2A, 2C
AS-1/2
200
AS-1/4
150
125
0
Selected Pulse-Handling Capability @ 125°C
14
AS-2A
12
AS-2
Energy (watts-second)
AS-2B
10
8
6
4
AS-1
2
0
0.1
AS-1/2
AS-1/4
0.2
0.5
1
2
Resistance (ohms)
5
10
AS-2B
AS-2C
AS-2
AS-3
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%
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
92
Issue D · 03.06
10. 11
Semi-Precision Power
Semi-Precision Power
Wirewound Resistor
Wirewound Resistor
AS Series
AS Series
Welwyn Components
Ordering Procedure
Example: AS1/4 at 1 kilohm and 5% tolerance on a reel of 2000 pieces -
AS1/4
–
1K0J
I
Winding
N
Standard
Non-inductive
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
D
F
0.5%
1%
H
J
3%
5%
Packing
I
Tape
AS¼, ½, 1C
AS1, 2, 2B, 2C, 3
AS5, 7, 10
2000/reel
1000/reel
500/reel
Standard
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ 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
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Issue D · 03.06
10. 11
DIY/Open Source Hardware
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