Semi-Precision Power
Resistors
Semi-Precision Resistor
Wirewound Power
Wirewound Resistor
Semi-Precision Power
Welwyn Components
Welwyn Components
Wirewound Resistor
•
0.25 to 10 watts
•
Tolerance down to ±0.5%
•
0.25 to
(N)AS Series
10 watts
•
0.1 ohm to 175K ohms
•
Tolerance down to ±0.5%
0.25 to 10 watts
•
Resistance wire TCR ±20 ppm/°C
•
0.1 ohm to 175K
±0.5%
Tolerance down to
ohms
•
Resistance wire TCR ±20 ppm/°C
0.1 ohm to 175K ohms
Resistance wire TCR ±20 ppm/°C
Non inductive (NAS) option
Pb-free option is RoHS compliant
AS Series
AS Series
Electrical Data
Electrical Data
Type
(N)AS-
1
/
4
(N)AS-
1
/
2
(N)AS-1
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Equivalent
Power Rating
Commercial Range
Non-Inductive Range
Available Resistance
MIL-R-26
(watts)
(ohms)
(ohms)
(ohms)
Type
Style
125°C
25°C
Min.
Max.
Min.
Max.
0.5%, 1%
3%, 5%
Equivalent
Power Rating
Commercial Range
Non-Inductive Range
Available Resistance
(N)AS-
1
/
4
0R1-1K0
60R
0R2
1K0
1
0R1
0.25
1R0-1K0
MIL-R-26
RW81
(watts)
(ohms)
(ohms)
(ohms)
1
/
2
(N)AS-
60R
1%
1R0-6K0
0R5
6K0
1
Min.
0R1
0.5
Style
125°C
25°C
Max.
Min.
Max.
0.5%,
3%, 5%
0R1-6K0
(N)AS-1
3K8
0R2
7K5
2 0R1
0R1
1 1
RW70U
0R1-1K0 0R1-7K5
60R
0R2
1K0
RW81
0.25
1R0-1K0 1R0-7K5
(N)AS-1C
1K0
10R
2K0
2 0R1
R05
1 1
0R1-6K0 R05-2K0
60R
0R5
6K0
0.5
1R0-6K0 1R0-2K0
RW79U
1
1
2
3
RW74U
2
3
RW78U
5
7
2 2
3 2
2 3
3 4
5 3
7 5
10 7
9
14
3 0R1
4 R05
3 0R1
5 0R1
7 0R1
9 0R1
14 0R1
0R1
0R1
0R1
7K5
0R1
2K0
0R1
20K
0R1
24K
0R1
18K
0R1
30K
0R1
60K
90K
175K
20K
0R2
24K
10R
18K
R25
30K
0R1
60K
0R2
90K
0R1
175K
0R1
0R2
0R2
R25
3K8
0R1
1K0
0R2
10K
0R1
12K
0R1
7K5
0R2
15K
0R2
30K
45K
50K
10K
1R0-7K5
12K
1R0-2K0
7K5
1R0-20K
15K
1R0-24K
30K
1R0-18K
45K
1R0-30K
1R0-90K
1R0-175K
1R0-20K
0R1-7K5
1R0-24K
R05-2K0
1R0-18K
0R1-20K
1R0-30K
0R1-24K
1R0-60K
0R1-18K
1R0-90K
0R1-30K
0R1-90K
0R1-175K
0R1-20K
0R1-24K
0R1-18K
0R1-30K
0R1-60K
0R1-90K
0R1-175K
(N)AS-2
RW70U
(N)AS-1C (N)AS-2B
RW79U
(N)AS-2 (N)AS-2C
(N)AS-2B (N)AS-3
(N)AS-2C (N)AS-5
(N)AS-3 (N)AS-7
(N)AS-5
(N)AS-7
(N)AS-10
(N)AS-10
RW74U
50K
0R1-60K
1R0-60K 1R0-175K
10
RW78U
Physical Data
Dimensions Inches (mm)
Physical Data
(0.81)
Type
A ±0.032
(N)AS-
1
/
4
0.250(6.4)
Dimensions Inches (mm)
(N)AS-
1
/
2
(0.81)
0.312(7.9)
Type
B (max)
A ±0.032
B (max)
C (max)
D (nom)
0.020 (0.5)
E (min)
1.50 (38.1)
0.094 (2.4) 0.312 (7.9)
0.094(max) 0.375 (9.5) 0.020 (0.5) 1.50 (38.1)
E (min)
D (nom)
C (2.4)
(N)AS-
1
/
4
(N)AS-1
0.312 (7.9) 0.020 (0.5) 1.50 (38.1)
0.094
0.250(6.4) 0.367(9.3) (2.4) 0.125 (3.2) 0.429 (10.9) 0.020 (0.5) 1.50 (38.1)
1
/
2
(N)AS-1C
0.256(6.5) (2.4) 0.115 (2.9) 0.303 (7.7) 0.025 (0.64) 1.50 (38.1)
(N)AS-
0.375 (9.5) 0.020 (0.5) 1.50 (38.1)
0.094
0.312(7.9)
(N)AS-1 (N)AS-2
0.429 (10.9) 0.020 (0.5) 1.50 (38.1)
0.125
0.367(9.3) 0.480(12.2)(3.2) 0.250 (6.3) 0.600 (15.2) 0.032 (0.8) 1.50 (38.1)
(N)AS-1C (N)AS-2B
0.303 (7.7) 0.025 (0.64) 1.50 (38.1)
0.115
0.256(6.5) 0.540(13.7)(2.9) 0.219 (5.6) 0.663 (16.6) 0.032 (0.8) 1.30 (33.0)
(N)AS-2C
0.489(11.0)(6.3) 0.157 (4.0) 0.594 (15.1) 0.032 (0.8) 1.30 (33.0)
(N)AS-2
0.600 (15.2) 0.032 (0.8) 1.50 (38.1)
0.250
0.480(12.2)
D
0.687(17.5)(5.6) 0.282 (7.2) 0.812 (20.6) 0.040 (1.0) 1.50 (38.1)
(N)AS-2B (N)AS-3
0.663 (16.6) 0.032 (0.8) 1.30 (33.0)
0.219
0.540(13.7)
(N)AS-5
0.875(22.2)(4.0) 0.344 (8.8) 0.980 (24.9) 0.040 (1.0) 1.50 (38.1)
(N)AS-2C
0.594 (15.1) 0.032 (0.8) 1.30 (33.0)
0.157
0.489(11.0)
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
(N)AS-7
0.812 (20.6) 0.040 (1.0) 1.50 (38.1)
0.282
0.687(17.5)1.250(31.8)(7.2) 0.344 (8.8) 1.375 (35.0) 0.040 (1.0) 1.50 (38.1)
(N)AS-10
0.980 (24.9) 0.040 (1.0) 1.50 (38.1)
0.344
0.875(22.2)1.812(46.0)(8.8) 0.385 (9.8) 1.937 (49.2) 0.040 (1.0) 1.50 (38.1)
1.250(31.8)
1.812(46.0)
0.344 (8.8) 1.375 (35.0)
0.385 (9.8) 1.937 (49.2)
0.040 (1.0)
0.040 (1.0)
1.50 (38.1)
1.50 (38.1)
E
D
E
A
A
B
C
B
C
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.
General Note
General Note
Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
©
Welwyn Components reserves the right to make changes in product specification
or liability.
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 · of going to print.
All information is subject to Welwyn’s own data ·and is considered accurate at time Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
Issue D · 03.06
02.16
A subsidiary of
TT electronics plc
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© 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
A subsidiary of
TT electronics plc
www.ttelectronics.com/resistors
91
91
Semi-Precision Power
Wirewound Resistor
Semi-Precision Power
Semi-Precision Power
(N)AS Series
Wirewound Resistor
Wirewound Resistor
AS Series
AS Series
Performance Data
Power Derating
Power Derating
200
200
175
175
150
150
125
125 AS-2B
AS-2B
100
100
75
75
0
25
0
25
AS-1/4, 1/2, 1, 1C
AS-1/4, 1/2, 1, 1C
AS-3, 2
AS-3, 2
AS-2C
AS-2C 10
AS-5,
AS-5, 10
Welwyn Components
Welwyn Components
Temperature Rise @ 25°C
Temperature Rise @ 25°C
275
275
250
250
200
200
150
150
100
100
50
50
25
25
0
0
AS-7, 10
AS-7, 10
AS-3, AS-5
AS-3, AS-5
AS-2C
AS-2C
AS-1,2
AS-1,2
AS-2B
AS-2B
AS-1C
AS-1C
AS-1/2
AS-1/2
AS-1/4
AS-1/4
Percent of 125C Power Rating
Percent of 125C Power Rating
AS-7
AS-7
HotHot Spot Temperature (C)
Spot Temperature (C)
75
75
125
175
125
175
Ambient Temperature (C)
Ambient Temperature (C)
225
225
275
275
40
80
120
40 Percent of 25C Power Rating
80
120
Percent of 25C Power Rating
160
160
200
200
Temperature Rise @ 125°C
Temperature Rise @ 125°C
275
275
250
250
AS-7, 10
AS-7, 10
AS-3, AS-5
AS-3, AS-5
AS-2C
AS-2C
AS-1,2
AS-1,2
AS-2B
AS-2B
AS-1C
AS-1C
AS-1/2
AS-1/2
Selected Pulse-Handling Capability @ 125°C
Selected Pulse-Handling Capability @ 125°C
14
14
12
12
10
10
HotHot Spot Temperature (
°C) °C)
Spot Temperature (
Energy (watts-second)
Energy (watts-second)
AS-2
AS-2
AS-3
AS-3
200
200
8
8
6
6
4
4
2
2
AS-1/2
AS-1/2
AS-1/4
AS-1/4
0.2
0.2
AS-1
AS-1
AS-2B
AS-2B
AS-2C
AS-2C
AS-1/4
AS-1/4
150
150
125
1250
0
40
80
120
160
40Percent of80
120 Rating 160
125
°C
Power
Percent of 125
°C
Power Rating
200
200
0
0.1
0
0.1
0.5
1
2
0.5Resistance (ohms) 2
1
Resistance (ohms)
5
5
10
10
Environmental Testing at 25°C
Environmental Testing
Environmental Testing at 25°C
Test Condition
Test
Life 1000
Load
Condition
hours
Load Life 1000 hours
Moisture Resistance
Moisture Resistance
Temperature Cycle
Temperature Cycle
Short Time Overload
Short Time Overload
Low Temperature Operation
Low Temperature Operation
Solder Heat
Solder
Shock Heat
Shock
Vibration
Vibration
Max
∆R
Max
∆R
1.0%
1.0%
1.0%
1.0%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.25%
0.25%
0.5%
0.5%
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
© 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
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
02.16
Issue D · 03.06
Semi-Precision Power
Wirewound Resistor
(N)AS Series
Ordering Procedure
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: AS3-27KFI
(AS3, 27 kilohms ±1%, Pb-free)
A
1
1
Winding
Omit for
standard
N = non-
inductive
S
2
2
Type
3
-
2
7
3
3
Value
K
F
4
I
5
4
Tolerance
5
Termination & Packing
I = Pb-free, Standard packing bulk*
AS1/4, AS1/2
E24 = 3/4 D = ±0.5%
F = ±1% AS1/4, 1/2, 1, 1C, 2,
characters
AS1, AS1C
1000/box
R = ohms
AS2, AS2B
H = ±3% 2B, 2C, 3, 5
K = kilohms
AS2C, AS3
500/box
J = ±5% AS7, 10
AS5, AS7, AS10
* Tape and reel available on request
USA (IRC) Part Number: AS32702FLF
(AS3, 27 kilohms ±1%, Pb-free)
A
1
1
Winding
Omit for
standard
N = non-
inductive
S
2
2
Type
3
2
7
3
3
Value
0
2
F
4
L
5
4
Tolerance
D = ±0.5%
F = ±1%
H = ±3%
J = ±5%
5
Termination & Packing
LF=Pb-free, Omit for SnPb
Standard packing bulk*
AS1/4, 1/2, 1, 1C, 2, 2B
1000/box
2C, 3, 5
AS7, 10
500/box
* Tape and reel available on request
F
3 digits +
AS1/4, AS1/2
multiplier
AS1, AS1C
AS2, AS2B
R = ohms for
AS2C, AS3
values <100
AS5, AS7, AS10
ohms
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
02.16
Test/Measurement
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