Semi-Precision Power
Resistors
Semi-Precision Resistor
Wirewound Power
Semi-Precision Power
Wirewound Resistor
AS Series
Wirewound Resistor
AS Series
Welwyn Components
Welwyn Components
•
0.25 to 10 watts
•
Tolerance down to ±0.5%
•
0.25 to 10 watts
(N)AS Series
ohm to 175K ohms
•
0.1
•
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 150K ohms
Resistance wire TCR ±20 ppm/°C
Non inductive (NAS) option
Pb-free option is RoHS compliant
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 amended by (EU) 2015/863 (RoHS3)
Equivalent
Power Rating
AS Standard Range
NAS Non-inductive
Available Tolerance (%)
Range (ohms)
MIL-R-26
(watts)
(ohms)
<1R0
≥1R0
Type
Style
125°C
25°C
Min.
Max.
Min.
Max.
Equivalent
Power Rating
AS Standard Range
NAS Non-inductive
Available Tolerance (%)
(N)AS-
1
/
4
500R
1R0
4K0
Range (ohms)
1
0R2
0.25
MIL-R-26
RW81
(watts)
(ohms)
1
/
2
(N)AS-
3K0
1R0
6K0
1
Min.
0R24
0.5
<1R0
≥1R0
Style
125°C
25°C
Max.
Min.
Max.
(N)AS-1
3K8
0R1
7K5
2 0R2
0R1
1 1
RW70U
500R
1R0
4K0
RW81
0.25
(N)AS-1C
1K0
10R
2K0
2 0R24
R05
1 1
3K0
1R0
6K0
0.5
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
33K
0R1
18K
0R1
30K
0R1
60K
90K
150K
20K
0R1
33K
10R
18K
0R5
30K
0R5
60K
0R2
90K
0R5
150K
0R8
1R0
0R3
0R5
3K8
0R5
1K0
0R2
10K
0R5
12K
0R8
7K5
1R0
15K
0R3
30K
45K
51K
10K
12K
7K5
3,
15K 5
30K
45K
51K
3, 5
0.5, 1, 3, 5
0.5, 1, 3, 5
(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
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
1.30 (33.0)
0.663 (16.6) 0.032 (0.8)
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
05.20
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
9
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
05.20
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
1
E24 = 3/4
AS1/4, AS1/2
characters
AS1, AS1C
R = ohms
AS2, AS2B
K = kilohms
AS2C, AS3
AS5, AS7, AS10
D = ±0.5% I = Pb-free, Standard pack (73mm tape & reel)
F = ±1%
Tape & reel pack quantities
H = ±3%
AS-1/4 to AS-7
1000/reel
J = ±5%
AS-10
500/reel
Note 1: For alternative packing options, use USA part number format.
USA (IRC) Part Number: AS32702FLF
(AS3, 27 kilohms ±1%, Pb-free)
A
1
1
Winding
Omit for
standard
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%
F
6
5
Termination
6
Packing
1
AS1/4, AS1/2
3 digits +
AS1, AS1C
multiplier
AS2, AS2B
R = ohms for
N = non-
AS2C, AS3
values <100
inductive AS5, AS7, AS10
ohms
Omit for SnPb
Omit for standard (73mm) tape & reel
LF = Pb-free BLK
All sizes
Bulk
AS-1/4,
Non-standard (63.5mm)
TAF
AS-1C
tape & reel
AS-1,
Non-standard (52.4mm)
TAE
AS-1C
tape & reel
Non-standard (63.5mm)
TBD
AS-2
tape & reel
AS-2,
Non-standard (52.4mm)
TBC
AS-2B
tape & reel
Tape & reel pack quantities
AS-1/4 to AS-7
1000/reel
AS-10
500/reel
Note 1: For full details see PS002 - Packing Specification Axial Resistors (IRC Origin):
https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicationNotes/PS002-Packing-of-Axial-Resistors-IRC-Origin.pdf
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
05.20
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