SEMI-PRECISION
POWER WIREWOUND RESISTORS
ISO-9001
Registered
T
SERIES
MIL-R-26 (RW), MIL-R-39007 (RWR)
& COMMERCIAL STYLES
High thermal conductivity,
centerless ground ceramic cores
for optimum heat distribution and
dissipation.
Weldable and
solderable leads
Silicone coat
•
•
•
•
•
•
0.1 ohm to 300K ohms
All welded
NOTE:
Special MIL qualified
1.0 to 14 watts
construction
overcoat
available
when
application requires lifetime
±1 to ±0.1% tolerance
durability and meets with ease
Non-inductive windings available
new MIL-STD-202F Method
215G. Specify VC.
Meets or exceeds all applicable MIL-R-26 & MIL-R-39007 ratings
Established reliability documented failure rate 100% screening (S failure rate approval)
SPECIFICATIONS:
Style
T-1/2
T-1/2-A81/LA268
T-1A-70/LA449
T-1-80/LA249
T-2A *
T-2A-69/LA417
T-2B-79/LA461
T-3*
T-5*
T-5-74/LA446
T-6
T-6-67/LA419
T-7 *
T-7A-55
T-10A-56
T-10*
T-10-78/LA433
MIL-R-26
Style
---
RW81
RW70
RW80
---
RW69
RW79
---
---
RW74
---
RW67
---
RW55
RW56
---
RW78
RW68
Wattage Rating
U
V
0.75
---
1.0
---
1.0
---
2.0
3.0
---
3.0
4.0
5.0
5.0
6.0
5.0
7.0
---
---
10.0
10.0
---
---
3.75
3.0
---
5.5
6.5
---
7.5
6.5
9.0
7.0
14.0
13.0
---
11.0
Resistance Range (ohms)
Commercial
MIL-R-26
Min
Ω
Max
ΚΩ
Min
Ω
Max
ΚΩ
0.1
4
---
---
0.1
4.5
0.1
1
0.1
12
0.1
3.16
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
12
25
20
40
38
45
94
65
92
115
200
300
300
300
300
0.1
---
0.1
0.1
---
---
0.1
---
0.1
---
0.1
0.1
---
0.1
0.1
3.16
---
2
10.5
---
---
38.3
---
8.2
---
3.4
9.1
---
90.9
20
Maximum
Working
Voltage
54.77
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
1732.0
1816.6
T-10-68/LA433
*Available
as radial lead = type TR. To designate non-inductive winding add prefix "N" to style.
MIL-R-39007
Style
PR268
PR66
PR462
PR249
PR261
PR446
PR246
PR433
Style
RWR81
RWR82
RWR71
RWR80
RWR89
RWR74
RWR84
RWR78
Wattage at 25°C
1
1.5
2
2
3
5
7
10
Resistance Range (ohms)
Min 0.1 %
0.499
0.499
0.499
0.499
0.499
0.499
0.499
0.499
Min 1.0%
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Max
1K
1.3K
16.2K
3.16K
4.12K
12.1K
12.4K
39.2K
Maximum
Working Voltage
31.6
44.2
180.0
79.5
111.2
246.0
294.6
626.1
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
1
ISO-9001
Registered
T SERIES GENERAL SPECIFICATIONS:
Temperature Range
Standard Temperature
Coefficient
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
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.
- Ratio Tolerance matched sets available.
Special Temperature
Coefficients
Insulation Resistance
Derating
IRC/Shallcross
Style
T-1/2
T-1/2-A81/LA268
T-1A-70/LA449
T-1-80/LA49
T-2A
T-2A-69/LA417
T-2B-79/LA461
T-3
T-5
T-5-74/LA446
T-6
T-6-67/LA419
T-7
T-7A-55
T-10A-56
T-10
T-10-78/LA433
T-10-68/LA433
PR268
PR66
PR462
PR249
PR261
PR446
PR246
PR433
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)
0.250 (±0.032)
0.312 (±0.016)
0.812 (±0.062)
0.406 (±0.032)
0.560 (±0.062)
0.875 (±0.062)
0.875 (±0.062)
1.78 (±0.062)
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)
6.4 (±0.8)
7.92 (±0.4)
20.6 (±1.6)
10.3 (±0.8)
14.2 (±1.6)
22.2 (±1.6)
22.2 (±1.6)
45.2 (±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)
0.085 (±0.020)
0.078 (±0.016)
0.188 (±0.031)
0.094 (±0.031)
0.187 (±0.031)
0.312 (±0.031)
0.312 (±0.031)
0.375 (±0.031)
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)
2.2 (±0.5)
1.98 (±0.4)
4.8 (±0.8)
2.4 (±0.8)
4.8 (±0.8)
7.9 (±0.8)
7.9 (±0.8)
9.53 (±0.8)
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
0.020
0.020
0.032
0.020
0.032
0.040
0.040
0.040
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
0.5
0.5
0.8
0.5
0.8
1.0
1.0
1.0
HOW TO ORDER:
Sample Part No.:
A
RW79
Style
Characteristic
Resistance Value
St. EIA/MIL Values
Tolerance
B=±0.1%, D+±0.5%, F=±1%
For commercial equivalents:
Style - Resistance - Tolerance
U
49R9
F
Length
B
Diameter
C
Diameter
1 1/2" (38.1mm)
Minimum
Lead Length
2
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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