Commercial Styles
Semi-Precision
Power Wirewound Resistors
T / NT Wirewound Series
•
•
•
•
•
0.1Ω to 300KΩ
0.75 to 14 watts
±0.1% to ±10% tolerance
Non-inductive windings available
Meets or exceeds all applicable MIL-R-26 ratings
High thermal
conductivity,
centerless ground
ceramic cores
for optimum heat
distribution and
dissipation
Weldable and
solderable leads
Silicone coat
All welded
construction
Electrical Data
IRC
Style
T-1/2
T-1/2-A81
T-1A-70
T-1-80
T-2A*
T-2A-69
T-2B-79
T-3
T-5*
T-5-74
T-6
T-6-67
T-7*
T-7A-55
T-10A-56
T-10*
T-10-78
T-10-68
Similar To
MIL-R-26
Style
---
RW81
RW70
RW80
---
RW69
RW79
---
---
RW74
---
RW67
---
RW55
RW56
---
RW78
RW68
Similar to
MIL-PRF-39007
Style
1
---
RWR81
1
---
RWR80
1
---
---
RWR89
1
---
---
RWR74 / 84
1
---
---
---
---
---
---
RWR78
1
---
Wattage Rating
U
0.75
1.0
1.0
2.0
3.0
---
3.0
4.0
5.0
5.0
6.0
---
7.0
---
---
10.0
10.0
---
V
---
---
---
---
3.75
3.0
---
5.5
6.5
---
7.5
6.5
9.0
7.0
14.0
13.0
---
11.0
Resistance Range (Ω)
Min
Ω
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Max KΩ
4
4.5
12
12
25
20
40
38
45
94
65
92
115
200
300
300
300
300
Maximum
Working
Voltage
54.8
67.1
109.5
154.9
306.2
244.9
346.4
457.2
540.8
685.5
698.2
773.3
1017.3
1183.2
2049.4
1974.8
1732
1816.6
* Available as radial lead = type TR.
Designate non-inductive winding by adding the prefix "N" to style.
1
The RWR is obsolete. The listed parts correspond to the commercial equivalent parts that are manufactured with the same procedures but lack
the burn-in screening that is required by MIL-PRF-39007
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
T / NT Wirewound Series Issue January 2010 Sheet 1 of 4
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
Commercial Styles
Semi-Precision
Power Wirewound Resistors
General Specifications
Temperature Range
Characteristic U = -55°C to +275°C
Characteristic V = -55°C to +350°C
±20 ppm/°C 10Ω up
±50 ppm/°C 1.0Ω to 9.9Ω
±400 ppm/°C 0.50Ω to 0.999Ω
±650 ppm/°C 0.1Ω to 0.490Ω
Available from -30 ppm/°C to +6000 ppm/°C
Temperature range for special TC’s -50°C to +150°C
1000 megohms minimum dry at 100 volts DC
Wattage rating based on operation at 25°C
Derate to zero at 275°C & 350°C for "U" and "V" style rating
Standard Temperature Coefficient
Special Temperature Coefficient
Insulation Resistance
Derating
Lead Material:
Tinned copperweld is standard.
Also available: Weldable Grade A nickel (bare)
Special Features:
- Radial lead available
- Resistance network packages designed to individual customer requirements
- Temperature coefficient matching and tracking to ±5 ppm
- High thermal conductivity core (Beryllium Oxide) available. See B Series.
- Ratio tolerance matched sets available
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
T / NT Wirewound Series Issue January 2010 Sheet 2 of 4
Commercial Styles
Semi-Precision
Power Wirewound Resistors
Physical Data
A
Length
B
Diameter
C
Diameter
1 ½” (38.1mm)
Minimum
Lead Length
Dimensions (Inches and (mm))
IRC / Shallcross
Style
T-1/2
T-1/2-A81
T-1A-70
T-1-80
T-2A
T-2A-69
T-2B-79
T-3
T-5
T-5-74
T-6
T-6-67
T-7
T-7A-55
T-10A-56
T-10
T-10-78
T-10-68
A
Inches
0.330 (±0.062)
0.250 (±0.032)
0.406 (±0.032)
0.406 (±0.032)
0.500 (±0.062)
0.500 (±0.063)
0.560 (±0.062)
0.625 (±0.062)
0.875 (±0.062)
0.875 (±0.062)
1.000 (±0.062)
1.000 (±0.094)
1.185 (±0.062)
1.375 (±0.094)
2.000 (±0.094)
1.812 (±0.062)
1.780 (±0.062)
1.875 (±0.063)
mm
8.4 (±1.6)
6.4 (±0.8)
10.3 (±0.8)
10.3 (±0.8)
12.7 (±1.6)
12.7 (±1.6)
14.2 (±1.6)
15.8 (±1.6)
22.2 (±1.6)
22.2 (±1.6)
25.4 (±1.6)
25.4 (±2.4)
30.0 (±1.6)
35.0 (±2.4)
50.8 (±2.4)
46.0 (±1.6)
45.2 (±1.6)
47.6 (±1.6)
Inches
0.078 (±0.031)
0.085 (±0.020)
0.094 (±0.032)
0.094 (±0.032)
0.187 (±0.031)
0.188 (±0.063)
0.187 (±0.031)
0.250 (±0.062)
0.312 (±0.062)
0.312 (±0.062)
0.312 (±0.062)
0.313 (±0.063)
0.312 (±0.062)
0.469 (±0.094)
0.469 (±0.094)
0.375 (±0.062)
0.375 (±0.062)
0.344 (±0.094)
B
mm
2.0 (±0.8)
2.2 (±0.5)
2.4 (±0.8)
2.4 (±0.8)
4.8 (±0.8)
4.8 (±1.6)
4.8 (±0.8)
6.3 (±1.6)
7.9 (±1.6)
7.9 (±1.6)
8.0 (±1.6)
8.0 (±1.6)
8.0 (±1.6)
12 (±2.4)
12 (±2.4)
9.5 (±1.6)
9.5 (±1.6)
8.7 (±2.4)
Inches
(±0.002)
0.020
0.020
0.020
0.020
0.032
0.032
0.032
0.040
0.040
0.040
0.040
0.032
0.040
0.032
0.032
0.040
0.040
0.032
C
mm (±0.05)
0.5
0.5
0.5
0.5
0.8
0.8
0.8
1.0
1.0
1.0
1.0
0.8
1.0
0.8
0.8
1.0
1.0
0.8
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
T / NT Wirewound Series Issue January 2010 Sheet 3 of 4
Commercial Styles
Semi-Precision
Power Wirewound Resistors
Ordering Data
Sample Part No.
Style
Non-inductive version = NT
T180
1000
1%
LF
Resistance Value
Expressed in ohms (Standard EIA/MIL values)
Tolerance
F = ±1%, D = ±0.5%, B = ±0.1%
RoHS Compliant
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
T / NT Wirewound Series Issue January 2010 Sheet 4 of 4
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