Semi-Precision Power
Semi-Precision
Power
Semi-Precision
Power
Wirewound Resistor
Wirewound Resistor
Wirewound Resistor
(N)ASAS Series
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
Non inductive (NAS) option
Welwyn Components
Welwyn Components
·
·
·
·
·
·
Pb-free option is RoHS compliant
Electrical Data
Electrical Data
Equivalent
Power Rating
Commercial Range
Non-Inductive Range
Available Resistance
Equivalent
Commercial Range
Non-Inductive(ohms)
Range
Available Resistance
MIL-R-26 Power Rating
(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 (N)AS-
1
/
4
Style
RW81
125°C
0.25
25°C
1
Min.
0R1
Max.
1K0
Min.
0R2
Max.
60R
0.5%, 1%
3%,
0R1-1K0
1R0-1K0
5%
1
/
4
(N)AS- (N)AS-
1
/
RW81
0R1-1K0
1
0R1
0.25
2
0R1-6K0
60R 1R0-1K0
0R5 60R
1
0R1 1K0 6K0 0R2
0.5
1R0-6K0
RW70U 0.5
(N)AS-1
1
RW70U
(N)AS-1C
(N)AS-1C
RW79U 1
(N)AS-2
RW79U
(N)AS-2
(N)AS-2B
(N)AS-2B
(N)AS-2C
(N)AS-2C
(N)AS-3
(N)AS-3
RW74U
(N)AS-5
RW74U
(N)AS-5
(N)AS-7
(N)AS-7
RW78U
(N)AS-10
RW78U
(N)AS-10
2
3
2
3
5
7
10
(N)AS-
1
/
2
(N)AS-1
1
1
2
3
2
3
5
7
10
1
2
2
3
4
3
5
7
9
14
2
2
3
4
3
5
7
9
14
0R1
0R1
R05
0R1
0R1
0R1
0R1
0R1
0R1
0R1
0R1
R05
0R1
0R1
0R1
0R1
0R1
0R1
0R1
6K0
7K5
2K0
20K
24K
18K
30K
60K
90K
7K5
2K0
20K
24K
18K
30K
60K
90K
0R5
0R2
10R
R25
0R1
0R2
0R1
0R1
0R2
10R
R25
0R1
0R2
0R1
0R1
0R2
0R2
60R
3K8
1K0
10K
12K
7K5
15K
30K
45K
50K
0R1-6K0
0R1-7K5
3K8 1R0-6K0
1R0-7K5
0R1-7K5
R05-2K0
1K0 1R0-7K5
1R0-2K0
R05-2K0
0R1-20K
10K 1R0-2K0
1R0-20K
0R1-20K
0R1-24K
12K 1R0-20K
1R0-24K
0R1-24K
0R1-18K
7K5 1R0-24K
1R0-18K
0R1-18K
1R0-18K
0R1-30K
15K
1R0-30K
0R1-30K
0R1-60K
30K 1R0-30K
1R0-60K
0R1-60K
0R1-90K
45K 1R0-60K
1R0-90K
0R1-90K
0R1-175K
50K 1R0-90K
1R0-175K
0R1-175K
1R0-175K
175K 0R2
0R2
175K
Physical Data
Physical Data
(mm)
Dimensions Inches
Dimensions Inches
±0.032 (0.81)
Type
E (min)
D (nom)
C (max)
B (max)
A
(mm)
Type
(N)AS-
±0.032 0.250(6.4)B (max)
E (min) (38.1)
D (nom)
C (max)
A
1
/
4
(0.81)
0.094 (2.4) 0.312 (7.9) 0.020 (0.5) 1.50
1
/
4
(N)AS- (N)AS-
1
/
2
0.094 (2.4) 0.312 (7.9) (9.5) (0.5) 1.50 (38.1) (38.1)
0.250(6.4)
0.094 (2.4) 0.375 0.020 0.020 (0.5) 1.50
0.312(7.9)
1
/
2
(N)AS- (N)AS-1
0.094 (2.4) 0.375 (9.5) (10.9) (0.5) (0.5) (38.1) (38.1)
0.312(7.9)
0.125 (3.2) 0.429 0.020 0.020 1.50 1.50
0.367(9.3)
(N)AS-1
0.125 (3.2) 0.429 (10.9) 0.020 (0.5) (0.64) (38.1) (38.1)
0.367(9.3)
(N)AS-1C
0.115 (2.9) 0.303 (7.7) 0.025 1.50 1.50
0.256(6.5)
(N)AS-1C
0.115 (2.9) 0.303 (7.7) 0.025 (0.64) 1.50 (38.1) (38.1)
0.256(6.5)
(N)AS-2
0.250 (6.3) 0.600 (15.2) 0.032 (0.8) 1.50
0.480(12.2)
(N)AS-2
0.250 (6.3) 0.600 (15.2) (16.6) (0.8) 1.50 (38.1) (33.0)
0.480(12.2)
(N)AS-2B
0.219 (5.6) 0.663 0.032 0.032 (0.8) 1.30
0.540(13.7)
D
(N)AS-2B
0.032 0.032 (0.8) 1.30
0.663 (16.6) (15.1) (0.8) 1.30 (33.0) (33.0)
0.219 (5.6) (4.0) 0.594
0.540(13.7)
(N)AS-2C
0.157
0.489(11.0)
(N)AS-2C
0.157 (4.0) 0.594 (15.1) (20.6) (0.8) 1.30 (33.0) (38.1)
0.489(11.0)
(N)AS-3
0.282 (7.2) 0.812 0.032 0.040 (1.0) 1.50
0.687(17.5)
(N)AS-3
0.282 (7.2) 0.812 (20.6) (24.9) (1.0) 1.50 (38.1) (38.1)
0.687(17.5)
(N)AS-5
0.344 (8.8) 0.980 0.040 0.040 (1.0) 1.50
0.875(22.2)
(N)AS-5
0.344 (8.8) 0.980 (24.9) (35.0) (1.0) 1.50 (38.1) (38.1)
0.875(22.2)
(N)AS-7
0.344 (8.8) 1.375 0.040 0.040 (1.0) 1.50
1.250(31.8)
(N)AS-7
0.344 (8.8) 1.375 (35.0) (49.2) (1.0) 1.50 (38.1) (38.1)
1.250(31.8)
(N)AS-10
0.385 (9.8) 1.937 0.040 0.040 (1.0) 1.50
1.812(46.0)
(N)AS-10
1.812(46.0)
0.385 (9.8) 1.937 (49.2)
0.040 (1.0)
1.50 (38.1)
E
D
E
A
C
C
B
A
B
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 ownproduct 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
1.14
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
200
200
175
175
150
150
125
125 AS-2B
AS-2B
100
100
75
75
0
25
0
25
Welwyn Components
Welwyn Components
Temperature Rise @ 25°C
Temperature Rise @ 25°C
275
275
250
250
Hot Spot Temperature
Hot Spot Temperature (C) (C)
AS-7, 10
AS-7, 10
AS-3, AS-5
AS-3, AS-5
AS-2A, 2C
AS-2A, 2C
AS-2B
AS-2B
AS-1/2
AS-1/2
AS-1/4
AS-1/4
Power Derating
Power Derating
Percent of 125C Power Rating
Percent of 125C Power Rating
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
200
200 AS-2A, 2C
AS-2A, 2C
150
150
100
100
50
50
25
25
0
0
AS-7
AS-7
75
75
125
175
125
175
Ambient Temperature (C)
Ambient Temperature (C)
225
225
275
275
40
80
120
160
40 Percent 80 25C Power Rating 160
120
of
Percent of 25C Power Rating
200
200
Temperature Rise @ 125°C
Temperature Rise @ 125°C
275
275
250
250
AS-7, 10
AS-7, 10
AS-2
AS-2
Selected Pulse-Handling Capability @ 125°C
Selected Pulse-Handling Capability @ 125°C
14
14
12
12
10
10
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-2A
AS-2A
AS-2
AS-2
AS-3
AS-3
Hot Spot Temperature (°C)
Hot Spot Temperature (°C)
200
200
AS-1/2
AS-1/2
Energy (watts-second)
Energy (watts-second)
AS-3, AS-5
AS-3, AS-5
AS-2A, 2C
AS-2A, 2C
AS-2B
AS-2B
AS-2B
AS-2B
AS-2C
AS-2C
AS-1/4
AS-1/4
150
150
125
0
125
0
40
80
120
160
40Percent of 125°C Power Rating 160
80
120
Percent of 125°C Power Rating
200
200
0
0.1
0
0.1
0.5
1
2
Resistance (ohms)2
0.5
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44
Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn
(0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
1.14
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
AS1/4, AS1/2
I = Pb-free, Standard packing
E24 = 3/4 D = ±0.5%
AS1, AS1C
F = ±1% AS1/4, 1/2, 1C
up to 2000/reel
characters
R = ohms
AS2, AS2B
H = ±3% AS1, 2, 2B, 2C, 3, 5, 7 1000/reel
K = kilohms
AS2C, AS3
J = ±5% AS10
500/reel
AS5, AS7, AS10
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
5
Termination & Packing
F
AS1/4, AS1/2
3 digits +
multiplier
AS1, AS1C
AS2, AS2B
R = ohms for
AS2C, AS3
values <100
ohms
AS5, AS7, AS10
D = ±0.5%
Omit for SnPb, Standard packing
F = ±1%
LF = Pb-free, Standard packing
H = ±3% AS1/4, 1/2, 1C
up to 2000/reel
J = ±5% AS1, 2, 2B, 2C, 3, 5, 7 1000/reel
AS10
500/reel
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
© TT electronics plc
1.14
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