Silicone coat
Weldable and
solderable leads
All welded
construction
High thermal
conductivity,
centerless ground
ceramic cores
for optimum heat
distribution and
dissipation
Commercial Styles Semi-Precision
Silicone coat
Weldable and
solderable leads
All welded
construction
High thermal
conductivity,
centerless ground
ceramic cores
for optimum heat
distribution and
dissipation
T / NT Wirewound Series
• 0.1: to 300K:
• 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.
Designate non-inductive winding by adding the prefi x "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The RWR is obsolete.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
Electrical Data
IRC
Style
Similar To
MIL-R-26
Style
Similar to
MIL-PRF-39007
Style
1
Wattage Rating Resistance Range (:)
Maximum
Working
Voltage
U V Min : Max K:
T-1/2
--- --- 0.75 --- 0.1 4 54.8
T-1/2-A81
RW81 RWR81
1
1.0 --- 0.1 4.5 67.1
T-1A-70
RW70 --- 1.0 --- 0.1 12 109.5
T-1-80
RW80 RWR80
1
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 RWR89
1
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 RWR74 / 84
1
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 RWR78
1
10.0 --- 0.1 300 1732
T-10-68
RW68 --- --- 11.0 0.1 300 1816.6
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
Electrical Data
IRC
Style
Similar to
MIL-R-26
Style
Similar to
MIL-PRF-39007
Style
1
Wattage Rating Resistance Range (Ω)
U V Min Ω Max KΩ
Maximun
Working
Voltage
T-1/2 - - 0.75 - 0.1 4 54.8
T-1/2-A81 RW81 RWR81
T-1A-70 RW70 - 1.0 - 0.1 12 109.5
T-2A-69 RW69 - - 3.0 0.1 20 244.9
T-2B-79 RW79 RWR89
T-7A-55 RW55 - - 7.0 0.1 200 1183.2
T-10A-56 RW56 - - 14.0 0.1 300 2049.4
T-10-78 RW78 RWR78
T-10-68 RW68 - - 11.0 0.1 300 1816.6
T-1C - - 1 2 .05 2K 109.5
T-1-80 RW80 RWR80
T-2A* - - 3.0 3.75 0.1 25 306.2
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 RWR74 / 84
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-10* - - 10.0 13.0 0.1 300 1974.8
1
1
1
1
1
1.0 - 0.1 4.5 67.1
2.0 - 0.1 12 154.9
3.0 - 0.1 40 346.4
5.0 - 0.1 94 685.5
10.0 - 0.1 300 1732
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
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
07.12
Commercial Styles Semi-Precision
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 Coeffi cient
±20 ppm/°C 10: up
±50 ppm/°C 1.0: to 9.9:
±400 ppm/°C 0.50: to 0.999:
±650 ppm/°C 0.1: to 0.490:
Special Temperature Coeffi cient
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 coeffi cient matching and tracking to ±5 ppm
- High thermal conductivity core (Beryllium Oxide) available. See B Series.
- Ratio tolerance matched sets available
General Specifi cations
Power Wirewound Resistors
T / NT Wirewound Series
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
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
07.12
Commercial Styles Semi-Precision
Dimensions (Inches and (mm))
IRC / Shallcross
Style
A BC
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
Physical Data
Commercial Styles
Semi-Precision
Power Wirewound Resistors
C
Diameter
A
Length
B
Diameter
1 ½” (38.1mm)
Minimum
Lead Length
Dimensions (Inches and (mm))
IRC / Shallcross
Style
A BC
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
Power Wirewound Resistors
T / NT Wirewound Series
T-1C 0.303 (±0.032) 7.7 (±0.8) 0.115 (±0.32) 2.9 (±0.8)
0.025 0.6
0.032 0.8
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
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
07.12
Commercial Styles Semi-Precision
Commercial Styles
Semi-Precision
Power Wirewound Resistors
Sample Part No.
Style
Non-inductive version = NT
Resistance Value
Expressed in ohms (Standard EIA/MIL values)
Tolerance
F = ±1%, D = ±0.5%, B = ±0.1%
RoHS Compliant
Ordering Data
T180 1000 1% LF
Power Wirewound Resistors
T / NT Wirewound Series
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
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
07.12
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