Beryllia Core, Silicone Coated
Power Resistors MIL-R-26 (RW)
& Commercial Industrial Styles
B Series
IRC "B" Series resistors offer power ratings up to 4 times highere than standard power wirewound resistors of
equal size. This is made possible due to a finer heat dissipation pattern. The Series "B" resistors will equal the
same stability and environmental requirements of lower rated conventional resistors.
Electrical Data
Heat Dissipation
Power Rating
Power to Size Ratio
Wattage
Beryllia core provides finest possible pattern
Up to 4x higher than conventional resistors, depending upon physical size
35% to 400% greater than standard silicone coated types
1 watt to 18 watts
± 20 ppm/°C 10Ωup
± 50 ppm/°C 1Ω to 9.9Ω
± 400 ppm/°C 0.5Ω to 0.499Ω
± 650 ppm/°C 0.1Ω to 0.499Ω
22 special T.C.’s available from -20 ppm to +6000 ppm
± 1% to + 0.1%
From .1 to 150K
Special high temperature silicone coating, impervious to moisture,
salt water immersion, and abrasion
Tinned copperweld is standard
500 volts AC for B-1, B-2, B-3; all others 1000 volts
5000 megaohms minimum dry
Standard Temperature Coefficients
Special Temperature Coefficients
Tolerance
Resistance Values
Coating
Leads
Dielectric Strength
Insulation Resistance
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.
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
A subsidiary of
TT electronics plc
B Series Issue September 2008 Sheet 1 of 3
Beryllia Core, Silicone Coated
Power Resistors MIL-R-26 (RW)
& Commercial Industrial Styles
Physical Data
A
Length
B
C dia.
D
Lead Length
1.375 (34.9 mm) Minimum
IRC
Style
U
B-1
B-2
B-3
B-5
B-5A
B-5C
B-6
B-10
B-12
B-15
Rated
Wattage
V
Dimensions
Length
A
.250 ± .032
Diameter
B
.085 ± .020
.078 ± .032
.094 ± .032
.188 ± .032
.188 ± .032
.218 ± .032
.250 ± .032
.312 ± .032
.312 ± .032
.375 ± .032
Lead
Diam. C
AWG
#24
#24
#24
#20
#20
#18
#18
#18
#18
#18
IRC
Max
Resistance
2.0K
3.4K
6.5K
22K
34K
18K
40K
54K
75K
150K
Metric Dimensions
Dimensions
Length
A
6.4 ± 0.8
7.9 ± 1.6
10.3 ± 0.8
14.3 ± 1.6
20.6 ± 1.6
12.7 ± 1.6
15.7 ± 1.6
22.2 ± 1.6
31 ± 1.6
45.2 ± 1.6
Diameter
B
2.2 + 0.5
2.0 + .08
2.4 + .08
4.8 + .08
4.8 + .08
5.5 + .08
6.4 + .08
7.9 + .08
7.9 + .08
7.9 + .08
Lead
Dia. C
mm
0.5
0.5
0.5
0.8
0.8
1.0
1.0
1.0
1.0
1.0
1.0
1.5
2.25
4.0
4.5
5.0
6.0
7.0
10.0
15.0
2.0
2.75
5.0
6.5
7.0
8.0
10.0
12.0
18.0
.312 ± .062
.406 ± .032
.562 ± .062
.812 ± .062
.500 ± .062
.625 ± .062
.875 ± .062
1.218 ± .062
1.780 ± .062
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
B Series Issue September 2008 Sheet 2 of 3
Beryllia Core, Silicone Coated
Power Resistors MIL-R-26 (RW)
& Commercial Industrial Styles
Power Derating Curve
120
Percent of Power Rating
100
80
Char. V
60
40
Char. U
20
0
25
75
125
175
225
275
350
Ambient Temperature (°C)
Derating
Ambient Temperature:
Operating temperature range of -55°C to +350°C.
Higher temperatures require derating as illustrated.
Stability:
Resistance chance is 1/2 or less than that of conventional power resistors when operated at the
same wattage.
Characteristic U
1. 275°C maximum hotspot temperature.
2. 5% maximum
∆R
for 2000 hour load life.
Characteristic U:
1. 350°C maximum hotspot temperature.
2. 3% maximum
∆R
for 2000 hour load life.
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
B Series Issue September 2008 Sheet 3 of 3
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