Semi-Precision Power
Wirewound Resistor
(N)AS Series
0.25to10was
Tolerance down to ±0.5%
0.1ohmto175Kohms
ResistancewireTCR±20ppm/°C
Noninducve(NAS)opon
Pb-freeoponisRoHScompliant
1R0-1K0
1R0-6K0
1R0-7K5
1R0-2K0
1R0-20K
1R0-24K
1R0-18K
1R0-30K
1R0-60K
1R0-90K
1R0-175K
Semi-Precision Power
Wirewound Resistor
AS Series
•0.25 to 10 watts
•Tolerance down to ±0.5%
•0.1 ohm to 175K ohms
•Resistance wire TCR ±20 ppm/°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.
© 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
Issue D · 03.06
A subsidiary of
TT electronics plc
Welwyn Components
Dimensions Inches (mm)
Type
(N)AS-1/4
(N)AS-1/2
(N)AS-1
(N)AS-1C
(N)AS-2
(N)AS-2B
(N)AS-2C
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
Physical Data
AE
D
C
B
Electrical Data
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%
(N)AS-1/4
(N)AS-1/2
(N)AS-1
(N)AS-1C
(N)AS-2
(N)AS-2B
(N)AS-2C
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
RW81
RW70U
RW79U
RW74U
RW78U
0.25
0.5
1
1
2
3
2
3
5
7
10
A ±0.032 (0.81)
0.250(6.4)
0.312(7.9)
0.367(9.3)
0.256(6.5)
0.480(12.2)
0.540(13.7)
0.489(11.0)
0.687(17.5)
0.875(22.2)
1.250(31.8)
1.812(46.0)
B (max)
0.094 (2.4)
0.094 (2.4)
0.125 (3.2)
0.115 (2.9)
0.250 (6.3)
0.219 (5.6)
0.157 (4.0)
0.282 (7.2)
0.344 (8.8)
0.344 (8.8)
0.385 (9.8)
C (max)
0.312 (7.9)
0.375 (9.5)
0.429 (10.9)
0.303 (7.7)
0.600 (15.2)
0.663 (16.6)
0.594 (15.1)
0.812 (20.6)
0.980 (24.9)
1.375 (35.0)
1.937 (49.2)
D (nom)
0.020 (0.5)
0.020 (0.5)
0.020 (0.5)
0.025 (0.64)
0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
E (min)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.30 (33.0)
1.30 (33.0)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
0R1
0R1
0R1
R05
0R1
0R1
0R1
0R1
0R1
0R1
0R1
1
1
2
2
3
4
3
5
7
9
14
1K0
6K0
7K5
2K0
20K
24K
18K
30K
60K
90K
175K
0R2
0R5
0R2
10R
R25
0R1
0R2
0R1
0R1
0R2
0R2
60R
60R
3K8
1K0
10K
12K
7K5
15K
30K
45K
50K
0R1-1K0
0R1-6K0
0R1-7K5
R05-2K0
0R1-20K
0R1-24K
0R1-18K
0R1-30K
0R1-60K
0R1-90K
0R1-175K
1R0-1K0
1R0-6K0
1R0-7K5
1R0-2K0
1R0-20K
1R0-24K
1R0-18K
1R0-30K
1R0-60K
1R0-90K
1R0-175K
Semi-Precision Power
Wirewound Resistor
AS Series
•0.25 to 10 watts
•Tolerance down to ±0.5%
•0.1 ohm to 175K ohms
•Resistance wire TCR ±20 ppm/°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.
© 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
Issue D · 03.06
A subsidiary of
TT electronics plc
Welwyn Components
Dimensions Inches (mm)
Type
(N)AS-1/4
(N)AS-1/2
(N)AS-1
(N)AS-1C
(N)AS-2
(N)AS-2B
(N)AS-2C
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
Physical Data
AE
D
C
B
Electrical Data
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%
(N)AS-1/4
(N)AS-1/2
(N)AS-1
(N)AS-1C
(N)AS-2
(N)AS-2B
(N)AS-2C
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
RW81
RW70U
RW79U
RW74U
RW78U
0.25
0.5
1
1
2
3
2
3
5
7
10
A ±0.032 (0.81)
0.250(6.4)
0.312(7.9)
0.367(9.3)
0.256(6.5)
0.480(12.2)
0.540(13.7)
0.489(11.0)
0.687(17.5)
0.875(22.2)
1.250(31.8)
1.812(46.0)
B (max)
0.094 (2.4)
0.094 (2.4)
0.125 (3.2)
0.115 (2.9)
0.250 (6.3)
0.219 (5.6)
0.157 (4.0)
0.282 (7.2)
0.344 (8.8)
0.344 (8.8)
0.385 (9.8)
C (max)
0.312 (7.9)
0.375 (9.5)
0.429 (10.9)
0.303 (7.7)
0.600 (15.2)
0.663 (16.6)
0.594 (15.1)
0.812 (20.6)
0.980 (24.9)
1.375 (35.0)
1.937 (49.2)
D (nom)
0.020 (0.5)
0.020 (0.5)
0.020 (0.5)
0.025 (0.64)
0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
E (min)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.30 (33.0)
1.30 (33.0)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
0R1
0R1
0R1
R05
0R1
0R1
0R1
0R1
0R1
0R1
0R1
1
1
2
2
3
4
3
5
7
9
14
1K0
6K0
7K5
2K0
20K
24K
18K
30K
60K
90K
175K
0R2
0R5
0R2
10R
R25
0R1
0R2
0R1
0R1
0R2
0R2
60R
60R
3K8
1K0
10K
12K
7K5
15K
30K
45K
50K
0R1-1K0
0R1-6K0
0R1-7K5
R05-2K0
0R1-20K
0R1-24K
0R1-18K
0R1-30K
0R1-60K
0R1-90K
0R1-175K
1R0-1K0
1R0-6K0
1R0-7K5
1R0-2K0
1R0-20K
1R0-24K
1R0-18K
1R0-30K
1R0-60K
1R0-90K
1R0-175K
Semi-Precision Power
Wirewound Resistor
AS Series
•0.25 to 10 watts
•Tolerance down to ±0.5%
•0.1 ohm to 175K ohms
•Resistance wire TCR ±20 ppm/°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.
© 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
Issue D · 03.06
A subsidiary of
TT electronics plc
Welwyn Components
Dimensions Inches (mm)
Type
(N)AS-1/4
(N)AS-1/2
(N)AS-1
(N)AS-1C
(N)AS-2
(N)AS-2B
(N)AS-2C
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
Physical Data
AE
D
C
B
Electrical Data
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%
(N)AS-1/4
(N)AS-1/2
(N)AS-1
(N)AS-1C
(N)AS-2
(N)AS-2B
(N)AS-2C
(N)AS-3
(N)AS-5
(N)AS-7
(N)AS-10
RW81
RW70U
RW79U
RW74U
RW78U
0.25
0.5
1
1
2
3
2
3
5
7
10
A ±0.032 (0.81)
0.250(6.4)
0.312(7.9)
0.367(9.3)
0.256(6.5)
0.480(12.2)
0.540(13.7)
0.489(11.0)
0.687(17.5)
0.875(22.2)
1.250(31.8)
1.812(46.0)
B (max)
0.094 (2.4)
0.094 (2.4)
0.125 (3.2)
0.115 (2.9)
0.250 (6.3)
0.219 (5.6)
0.157 (4.0)
0.282 (7.2)
0.344 (8.8)
0.344 (8.8)
0.385 (9.8)
C (max)
0.312 (7.9)
0.375 (9.5)
0.429 (10.9)
0.303 (7.7)
0.600 (15.2)
0.663 (16.6)
0.594 (15.1)
0.812 (20.6)
0.980 (24.9)
1.375 (35.0)
1.937 (49.2)
D (nom)
0.020 (0.5)
0.020 (0.5)
0.020 (0.5)
0.025 (0.64)
0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
E (min)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.30 (33.0)
1.30 (33.0)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
0R1
0R1
0R1
R05
0R1
0R1
0R1
0R1
0R1
0R1
0R1
1
1
2
2
3
4
3
5
7
9
14
1K0
6K0
7K5
2K0
20K
24K
18K
30K
60K
90K
175K
0R2
0R5
0R2
10R
R25
0R1
0R2
0R1
0R1
0R2
0R2
60R
60R
3K8
1K0
10K
12K
7K5
15K
30K
45K
50K
0R1-1K0
0R1-6K0
0R1-7K5
R05-2K0
0R1-20K
0R1-24K
0R1-18K
0R1-30K
0R1-60K
0R1-90K
0R1-175K
Make Possible
Resistors
02.16
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronicsresistors.com
AllPb-freepartscomplywithEUDirecve2011/65/EU(RoHS2)
Semi-Precision Power
Wirewound Resistor
(N)AS Series
Semi-Precision Power
Wirewound Resistor
AS Series
© 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
92
Issue D · 03.06
Welwyn Components
Power Derating Temperature Rise @ 25°C
Selected Pulse-Handling Capability @ 125°CTemperature Rise @ 125°C
200
175
150
125
100
75
0
Percent of 125C Power Rating
Ambient Temperature (C)
AS-1/4, 1/2, 1, 1C
AS-3, 2
AS-2C
AS-5, 10
AS-2B
AS-7
25 75 125 175 225 275
275
250
200
150
100
50
25
Hot Spot Temperature (C)
Percent of 25C Power Rating
AS-1/4
AS-7, 10
AS-1/2
AS-2C
AS-3, AS-5
AS-2B AS-1C
0 40 80 120 160 200
AS-1,2
275
250
200
150
125
Hot Spot Temperature ( °C)
Percent of 125 °C Power Rating
AS-1,2
AS-7, 10
AS-1/2
AS-1/4
AS-2C
AS-3, AS-5 AS-2B AS-1C
0 40 80 120 160 200
14
12
10
8
6
4
2
0
Energy (watts-second)
Resistance (ohms)
AS-3
AS-2B
AS-2
AS-2C
AS-1
AS-1/2
AS-1/4
0.1 0.2 0.5 1 2 5 10
Test Condition Max ∆R
Load Life 1000 hours 1.0%
Moisture Resistance 1.0%
Temperature Cycle 0.5%
Short Time Overload 0.5%
Low Temperature Operation 0.5%
Solder Heat 0.25%
Shock 0.5%
Vibration 0.5%
Environmental Testing at 25°C
Semi-Precision Power
Wirewound Resistor
AS Series
© 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
92
Issue D · 03.06
Welwyn Components
Power Derating Temperature Rise @ 25°C
Selected Pulse-Handling Capability @ 125°CTemperature Rise @ 125°C
200
175
150
125
100
75
0
Percent of 125C Power Rating
Ambient Temperature (C)
AS-1/4, 1/2, 1, 1C
AS-3, 2
AS-2C
AS-5, 10
AS-2B
AS-7
25 75 125 175 225 275
275
250
200
150
100
50
25
Hot Spot Temperature (C)
Percent of 25C Power Rating
AS-1/4
AS-7, 10
AS-1/2
AS-2C
AS-3, AS-5
AS-2B AS-1C
0 40 80 120 160 200
AS-1,2
275
250
200
150
125
Hot Spot Temperature ( °C)
Percent of 125 °C Power Rating
AS-1,2
AS-7, 10
AS-1/2
AS-1/4
AS-2C
AS-3, AS-5 AS-2B AS-1C
0 40 80 120 160 200
14
12
10
8
6
4
2
0
Energy (watts-second)
Resistance (ohms)
AS-3
AS-2B
AS-2
AS-2C
AS-1
AS-1/2
AS-1/4
0.1 0.2 0.5 1 2 5 10
Test Condition Max ∆R
Load Life 1000 hours 1.0%
Moisture Resistance 1.0%
Temperature Cycle 0.5%
Short Time Overload 0.5%
Low Temperature Operation 0.5%
Solder Heat 0.25%
Shock 0.5%
Vibration 0.5%
Environmental Testing at 25°C
EnvironmentalTesng
PerformanceData
Make Possible
02.16
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronicsresistors.com
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
S
3
-
2
7
K
F
I
2
3
4
5
USA (IRC) Part Number: AS32702FLF(AS3, 27 kilohms ±1%, Pb-free)
A
S
3
2
7
0
2
F
L
F
2
3
4
5
1
2
3
4
5
Winding Type ValueTolerance Termination & Packing
Omit for
standard
E24 = 3/4
characters
R = ohms
K = kilohms
D = ±0.5%
I = Pb-free, Standard packing bulk*
F = ±1%
1000/box
N = non-
inductive
H = ±3%
J = ±5%
AS7, 10
1
2
3
4
5
Winding Type ValueTolerance Termination & Packing
Omit for
standard
3 digits +
multiplier
D = ±0.5%
F = ±1%
N = non-
inductive
R = ohms fo
r
values <100
ohms
H = ±3%
J = ±5%
AS1/4, 1/2, 1, 1C, 2,
2B, 2C, 3, 5
500/box
AS1/4, AS1/2
AS1, AS1C
AS2, AS2B
AS2C, AS3
AS5, AS7, AS10
AS1/4, AS1/2
AS1, AS1C
AS2, AS2B
AS2C, AS3
AS5, AS7, AS10
* Tape and reel available on request
* Tape and reel available on request
LF=Pb-free, Omit for SnPb
Standard packing bulk*
AS1/4, 1/2, 1, 1C, 2, 2B
2C, 3, 5
AS7, 10 500/box
1000/box
Make Possible
02.16
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronicsresistors.com
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
TT Electronics:
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