Semi-Precision Power
Wirewound Resistor
AS / NAS Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
01. 12
· 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
General Note
IRC reserves the right to make changes in product specifi cation 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
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
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
Alloy resistance wirewound
to specific parameters
including TCR’s from
All welded
cap and lead
Heat conducting
ceramic
Silicone
conformal coating
Alpha-
Digital
Marking
Semi-Precision Power
Wirewound Resistor
Electrical Data
IRC Type
Similar
MIL-R-26
Style
Power Rating 275°C
Max. Hot Spot
AS / Commercial
Range (ohms)
NAS / Non-Inductive
Range (ohms)
Available Resistance
(ohms)
125°C 25°C Min. Max. Min. Max. 0.5%, 1% 3%, 5%
AS-1/4
NAS-1/4 RW81 0.25 1 0.1 1.0K 0.2 60 1-1K 0.1-1K
AS-1/2
NAS-1/2 0.5 1 0.1 6.0K 0.5 60 1-6K 0.1-6K
AS-1
NAS-1 RW70U 1 2 0.1 7.5K 0.2 3.8K 1-7.5K 0.1-7.5K
AS-1C
NAS-1C 1 2 .05 2K 10 1K 1-2K .05-2K
AS-2
NAS-2 RW79U 2 3 0.1 20K 0.25 10K 1-20K 0.1-20K
AS-2B
NAS-2B 3 4 0.1 24K 0.1 12K 1-24K 0.1-24K
AS-2C
NAS-2C 2 3 0.1 18K 0.2 7.5K 1-18K 0.1-18K
AS-3
NAS-3 3 5 0.1 30K 0.1 15K 1-30K 0.1-30K
AS-5
NAS-5 RW74U 5 7 0.1 60K 0.1 30K 1-60K 0.1-60K
AS-7
NAS-7 7 9 0.1 90K 0.2 45K 1-90K 0.1-90K
AS-10
NAS-10 RW78U 10 14 0.1 175K 0.2 50K 1-175K 0.1-175K
AS / NAS Series Issue February 2010 Sheet 1 of 3
General Note
IRC reserves the right to make changes in product specifi cation 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
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
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
Alloy resistance wirewound
to specific parameters
including TCR’s from
All welded
cap and lead
Heat conducting
ceramic
Silicone
conformal coating
Alpha-
Digital
Marking
Semi-Precision Power
Wirewound Resistor
Electrical Data
IRC Type
Similar
MIL-R-26
Style
Power Rating 275°C
Max. Hot Spot
AS / Commercial
Range (ohms)
NAS / Non-Inductive
Range (ohms)
Available Resistance
(ohms)
125°C 25°C Min. Max. Min. Max. 0.5%, 1% 3%, 5%
AS-1/4
NAS-1/4 RW81 0.25 1 0.1 1.0K 0.2 60 1-1K 0.1-1K
AS-1/2
NAS-1/2 0.5 1 0.1 6.0K 0.5 60 1-6K 0.1-6K
AS-1
NAS-1 RW70U 1 2 0.1 7.5K 0.2 3.8K 1-7.5K 0.1-7.5K
AS-1C
NAS-1C 1 2 .05 2K 10 1K 1-2K .05-2K
AS-2
NAS-2 RW79U 2 3 0.1 20K 0.25 10K 1-20K 0.1-20K
AS-2B
NAS-2B 3 4 0.1 24K 0.1 12K 1-24K 0.1-24K
AS-2C
NAS-2C 2 3 0.1 18K 0.2 7.5K 1-18K 0.1-18K
AS-3
NAS-3 3 5 0.1 30K 0.1 15K 1-30K 0.1-30K
AS-5
NAS-5 RW74U 5 7 0.1 60K 0.1 30K 1-60K 0.1-60K
AS-7
NAS-7 7 9 0.1 90K 0.2 45K 1-90K 0.1-90K
AS-10
NAS-10 RW78U 10 14 0.1 175K 0.2 50K 1-175K 0.1-175K
AS / NAS Series Issue February 2010 Sheet 1 of 3
Semi-Precision Power
Wirewound Resistor
AS / NAS Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
01. 12
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Semi-Precision Power
Wirewound Resistor
Physical Data
IRC Type A±0.032 B (max) C (max) D (Lead Diameter)
AS-1/4
NAS-1/4 0.250 (6.4) 0.094 (2.4) 0.312 (7.9) 0.020 (0.5)
AS-1/2
NAS-1/2 0.312 (7.9) 0.094 (2.4) 0.375 (9.5) 0.020 (0.5)
AS-1
NAS-1 0.367 (9.3) 0.125 (3.2) 0.429 (10.9) 0.020 (0.5) 0.025 (0.64)
AS-1C
NAS-1C 0.256 (6.5) 0.115 (2.9) 0.303 (7.7) 0.025 (0.64) 0.032 (0.8)
AS-2
NAS-2 0.480 (12.2) 0.250 (6.3) 0.600 (15.2) 0.032 (0.8)
AS-2B
NAS-2B 0.540 (13.7) 0.219 (5.6) 0.663 (16.6) 0.032 (0.8)
AS-2C
NAS-2C 0.489 (11.0) 0.157 (4.0) 0.594 (15.1) 0.032 (0.8)
AS-3
NAS-3 0.687 (17.5) 0.282 (7.2) 0.812 (20.6) 0.040 (1.0)
AS-5
NAS-5 0.875 (22.2) 0.344 (8.8) 0.980 (24.9) 0.040 (1.0)
AS-7
NAS-7 1.250 (31.8) 0.344 (8.8) 1.375 (35.0) 0.040 (1.0)
AS-10
NAS-10 1.812 (46.0) 0.385 (9.8) 1.937 (49.2) 0.040 (1.0)
A
C
1.50 MIN.
(38.1)
B
D
AS / NAS Series Issue February 2010 Sheet 2 of 3
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.
Semi-Precision Power
Wirewound Resistor
AS / NAS Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
01. 12
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Semi-Precision Power
Wirewound Resistor
Sample Part No.
IRC Type
Non-inductive styles will be indicated as NAS
Power
3 = 3 watts (See specifi cation chart for other power ratings)
Resistance Value
(100 ohms and greater - First 3 signifi cant 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 specifi es standard Sn/Pb plated lead wires.
Specifi cation Number (Optional)
Custom design identifi er for non-standard products
Ordering Data
AS 3 27R0 F LF XXX
AS / NAS Series Issue February 2010 Sheet 3 of 3
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 Power Derating Curve
Ambient Temperature (°C)
25 75 125 175 225 275
200
175
150
125
100
75
0
Percent of 125°C Power Rating
AS- 1/4, 1/2, 1, 1C
AS- 3, 2
AS- 2C
AS- 5, 10
AS- 7
AS- 2B
Selected Pulse-Handling
Capability @ 125°C
Resistance (ohms)
0.1 0.2 0.5 1 2 5 10
14
12
10
8
6
4
2
0
Energy (watts-second)
AS- 2A
AS- 3
AS- 2
AS- 2B
AS- 2C
AS- 1
AS- 1/2
AS- 1/4
