Semi-Precision Power
Wirewound Resistor
AS / NAS Series
•
1/4 watt to 10 watts
•
0.1 ohm to 175K ohms
•
±5%, ±3%, ±1%, ±.5% tolerance
•
Resistance wire TCR ±20 ppm/°C
•
RoHS-compliant version available
All welded
cap and lead
Alpha-
Digital
Marking
Silicone
conformal coating
Heat conducting
ceramic
Alloy resistance wirewound
to specific parameters
including TCR’s from
Electrical Data
IRC Type
Similar
MIL-R-26
Style
RW81
Power Rating 275°C
Max. Hot Spot
125°C
0.25
0.5
RW70U
1
1
RW79U
2
3
2
3
RW74U
5
7
RW78U
10
25°C
1
1
2
2
3
4
3
5
7
9
14
AS / Commercial
Range (ohms)
Min.
0.1
0.1
0.1
.05
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Max.
1.0K
6.0K
7.5K
2K
20K
24K
18K
30K
60K
90K
175K
NAS / Non-Inductive
Range (ohms)
Min.
0.2
0.5
0.2
10
0.25
0.1
0.2
0.1
0.1
0.2
0.2
Max.
60
60
3.8K
1K
10K
12K
7.5K
15K
30K
45K
50K
Available Resistance
(ohms)
0.5%, 1%
1-1K
1-6K
1-7.5K
1-2K
1-20K
1-24K
1-18K
1-30K
1-60K
1-90K
1-175K
3%, 5%
0.1-1K
0.1-6K
0.1-7.5K
.05-2K
0.1-20K
0.1-24K
0.1-18K
0.1-30K
0.1-60K
0.1-90K
0.1-175K
AS-1/4
NAS-1/4
AS-1/2
NAS-1/2
AS-1
NAS-1
AS-1C
NAS-1C
AS-2
NAS-2
AS-2B
NAS-2B
AS-2C
NAS-2C
AS-3
NAS-3
AS-5
NAS-5
AS-7
NAS-7
AS-10
NAS-10
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
AS / NAS Series Issue February 2010 Sheet 1 of 3
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Semi-Precision Power
Wirewound Resistor
Physical Data
1.50 MIN.
(38.1)
B
A
D
C
Please note lead length dimension
change on the following two items only:
AS / NAS -2B 1.3 min.
AS / NAS -2C 1.3 min.
NOTE:
• Coating and marking is resistant to normal degreasing.
Consult factory for special requirements.
IRC Type
AS-1/4
NAS-1/4
AS-1/2
NAS-1/2
AS-1
NAS-1
AS-1C
NAS-1C
AS-2
NAS-2
AS-2B
NAS-2B
AS-2C
NAS-2C
AS-3
NAS-3
AS-5
NAS-5
AS-7
NAS-7
AS-10
NAS-10
A±0.032
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 (Lead Diameter)
0.020 (0.5)
0.020 (0.5)
0.020 (0.5) 0.025 (0.64)
0.025 (0.64) 0.032 (0.8)
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)
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
AS / NAS Series Issue February 2010 Sheet 2 of 3
Semi-Precision Power
Wirewound Resistor
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
ΔR
1.0%
1.0%
0.5%
0.5%
0.5%
0.25%
0.5%
0.5%
Power Derating Curve
Percent of 125°C Power Rating
200
AS- 1/4, 1/2, 1, 1C
175
AS- 3, 2
150
125
AS- 2B
AS- 2C
AS- 5, 10
100
AS- 7
75
0
25
75
125
175
225
275
Ambient Temperature (°C)
Selected Pulse-Handling
Capability @ 125°C
14
AS- 2A
Energy (watts-second)
12
AS- 2
AS- 3
10
8
AS- 2B
6
AS- 2C
4
AS- 1
2
0
0.1
AS- 1/2
AS- 1/4
0.2
0.5
1
2
5
10
Resistance (ohms)
Ordering Data
Sample Part No.
IRC Type
Non-inductive styles will be indicated as NAS
AS
3
27R0
F
LF
XXX
Power
3 = 3 watts (See specification chart for other power ratings)
Resistance Value
(100 ohms and greater - First 3 significant digits plus 4th digit multiplier)
Example: 100 ohms = 1000, 1000 ohms = 1001, 150,000 ohms = 1503
(Less than 100 ohms - "R" is used to designate decimal)
Example: 51 ohms = 51R0, 1 ohm = 1R00, 0.25 ohms = R250
Tolerance
J = ±5%; H = ±3%; F = ±1%; D = ±0.5%
Lead Free Construction
RoHS compliance status: products carrying the LF designator will
provide 100% Matte Sn plated leads. Omission of the LF designator
explicitly specifies standard Sn/Pb plated lead wires.
Specification Number (Optional)
Custom design identifier for non-standard products
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
AS / NAS Series Issue February 2010 Sheet 3 of 3
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