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
• 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
Silicone coat
Weldable and
solderable leads
All welded
construction
High thermal
conductivity,
centerless ground
ceramic cores
for optimum heat
distribution and
dissipation
T 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
Commercial Styles
Semi-Precision
Power Wirewound Resistors
* Available as radial lead = type TR. To designate non-inductive winding, add prefix "N" to style.
Electrical Data
IRC
Style
Similar To
MIL-R-26
Style
Wattage Rating Resistance Range (Ω)Maximum
Working
Voltage
U V Min ΩMax KΩ
T-1/2 --- 0.75 --- 0.1 4 54.8
T-1/2-A81 RW81 1.0 --- 0.1 4.5 67.1
T-1A-70 RW70 1.0 --- 0.1 12 109.5
T-1-80 RW80 2.0 --- 0.1 12 154.9
T-2A* --- 3.0 3.75 0.1 25 306.2
T-2A-69 RW69 --- 3.0 0.1 20 244.9
T-2B-79 RW79 3.0 --- 0.1 40 346.4
T-3* --- 4.0 5.5 0.1 38 457.2
T-5* --- 5.0 6.5 0.1 45 540.8
T-5-74 RW74 5.0 --- 0.1 94 685.5
T-6 --- 6.0 7.5 0.1 65 698.2
T-6-67 RW67 --- 6.5 0.1 92 773.3
T-7* --- 7.0 9.0 0.1 115 1017.3
T-7A-55 RW55 --- 7.0 0.1 200 1183.2
T-10A-56 RW56 --- 14.0 0.1 300 2049.4
T-10* --- 10.0 13.0 0.1 300 1974.8
T-10-78 RW78 10.0 --- 0.1 300 1732
T-10-68 RW68 --- 11.0 0.1 300 1816.6
T Wirewound Series Issue December 2008 Sheet 1 of 4
• 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
Commercial Styles
Semi-Precision
Power Wirewound Resistors
Temperature Range Characteristic U = -55°C to +275°C
Characteristic V = -55°C to +350°C
Standard Temperature Coefficient
±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
Special Temperature Coefficient Available from -30 ppm/°C to +6000 ppm/°C
Temperature range for special TC’s -50°C to +150°C
Insulation Resistance 1000 megohms minimum dry at 100 volts DC
Derating Wattage rating based on operation at 25°C
Derate to zero at 275°C & 350°C for "U" and "V" style rating
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
General Specifications
T Wirewound Series Issue December 2008 Sheet 2 of 4
• 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
Dimensions (Inches and (mm))
IRC / Shallcross
Style
ABC
Inches mm Inches mm Inches
(±0.002) mm (±0.05)
T-1/2 0.330 (±0.062) 8.4 (±1.6) 0.078 (±0.031) 2.0 (±0.8) 0.020 0.5
T-1/2-A81 0.250 (±0.032) 6.4 (±0.8) 0.085 (±0.020) 2.2 (±0.5) 0.020 0.5
T-1A-70 0.406 (±0.032) 10.3 (±0.8) 0.094 (±0.032) 2.4 (±0.8) 0.020 0.5
T-1-80 0.406 (±0.032) 10.3 (±0.8) 0.094 (±0.032) 2.4 (±0.8) 0.020 0.5
T-2A 0.500 (±0.062) 12.7 (±1.6) 0.187 (±0.031) 4.8 (±0.8) 0.032 0.8
T-2A-69 0.500 (±0.063) 12.7 (±1.6) 0.188 (±0.063) 4.8 (±1.6) 0.032 0.8
T-2B-79 0.560 (±0.062) 14.2 (±1.6) 0.187 (±0.031) 4.8 (±0.8) 0.032 0.8
T-3 0.625 (±0.062) 15.8 (±1.6) 0.250 (±0.062) 6.3 (±1.6) 0.040 1.0
T-5 0.875 (±0.062) 22.2 (±1.6) 0.312 (±0.062) 7.9 (±1.6) 0.040 1.0
T-5-74 0.875 (±0.062) 22.2 (±1.6) 0.312 (±0.062) 7.9 (±1.6) 0.040 1.0
T-6 1.000 (±0.062) 25.4 (±1.6) 0.312 (±0.062) 8.0 (±1.6) 0.040 1.0
T-6-67 1.000 (±0.094) 25.4 (±2.4) 0.313 (±0.063) 8.0 (±1.6) 0.032 0.8
T-7 1.185 (±0.062) 30.0 (±1.6) 0.312 (±0.062) 8.0 (±1.6) 0.040 1.0
T-7A-55 1.375 (±0.094) 35.0 (±2.4) 0.469 (±0.094) 12 (±2.4) 0.032 0.8
T-10A-56 2.000 (±0.094) 50.8 (±2.4) 0.469 (±0.094) 12 (±2.4) 0.032 0.8
T-10 1.812 (±0.062) 46.0 (±1.6) 0.375 (±0.062) 9.5 (±1.6) 0.040 1.0
T-10-78 1.780 (±0.062) 45.2 (±1.6) 0.375 (±0.062) 9.5 (±1.6) 0.040 1.0
T-10-68 1.875 (±0.063) 47.6 (±1.6) 0.344 (±0.094) 8.7 (±2.4) 0.032 0.8
Physical Data
Commercial Styles
Semi-Precision
Power Wirewound Resistors
C
Diameter
A
Length
B
Diameter
1 ½” (38.1mm)
Minimum
Lead Length
T Wirewound Series Issue December 2008 Sheet 3 of 4
• 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
Sample Part No.
Style
Resistance Value
Expressed in ohms
(Standard EIA/MIL values)
Tolerance
F = ±1%, D = ±0.5%, B = ±0.1%
Ordering Data
T180 1000 1%
Commercial Styles
Semi-Precision
Power Wirewound Resistors
T Wirewound Series Issue December 2008 Sheet 4 of 4
