General Note
IRC reserves the right to make changes in product specifi cation 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
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IBT Series
Carbon Composition Resistor
Electrical Data
• Meets performance standards of EIA RS-172
• Hot molded process for product uniformity
• Ideal for pulse-loaded handling
• Non-inductive design
Tested Per MIL-STD-202
IBT 1/4 IBT 1/2 IBT 1
Power Rating
Determined by load life test 100% load @ 70°C ambient 1/4W 1/2W 1W
Rated Continuous Working Voltage (RCWV) P x R or 250 volts
whichever is less
P x R or 350 volts
whichever is less
P x R or 500 volts
whichever is less
Maximum Ambient Temperature
Resistors derated to zero load at this temperature ±130°C ±130°C ±130°C
Nominal Resistance Range 1Ω - 5.6 megΩ1Ω - 20 megΩ2.2Ω - 1 megΩ
Standard Resistance Tolerances ±5%, ±10% ±5%, ±10% ±10%
Dielectric Withstand Voltage
Atmospheric Pressure
Barometric pressure 3.4" Hg 115 millibars
500V
325V
700V
450V
1000V
650V
Insulation Resistance (min.) 10,000 meg 10,000 meg 10,000 meg
Voltage Coeffi cient of Resistance
% resistance change/volt at 10% and (min.)
100% RCWV for values 1K to 20 meg (max.)
-.005%
-.032%
-.005%
-.032%
-.005%
-.032%
Short-Time Overload Maximum Voltage
Apply 2.5 times RCWV at maximum Typical resistance change
Indicated for 5 seconds Maximum resistance change
700V
±0.5%
±2%
700V
±0.5%
±2%
700V
±0.5%
±2%
IBT Series Issue September 2010 Sheet 1 of 2
• 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
Resistance Temperature Characteristics
Resistance Range -55°C -105°C
Maximum percent resistance
change from room temperature
(+25°C) value
under 1K
1K to 9.1 K
10K to 91K
100K to 910K
1 meg to 10 meg
+2.0 to +5.0
+5.0 to +9.0
+8.0 to +11.0
+10.0 to +14.0
13.0 to +20.0
-4.0 to -2.0
-5.0 to -3.0
-7.0 to -5.0
-9.0 to -7.0
-14.0 to -9.0
Dimensions (Inches and (mm))
IRC Type A B C D
IBT 1/4 1.18 ± 0.12
(30.00 ± 3.0)
0.248 ± 0.028
(6.3 ± 0.70)
0.024 ± 0.002
(0.60 ± 0.05)
0.094 ± 0.004
(2.40 ± 0.10)
IBT 1/2 1.1 ± 0.12
(28.00 ± 3.0)
0.374 + 0.032 / -0.028
(9.50 + 0.80 / -0.70)
0.0275 ± 0.002
(0.70 ± 0.05)
0.142 ± 0.008
(3.6 ± 0.20)
IBT 1 1.02 ± 0.12
(26.00 ± 3.0)
0.56 ± 0.03
(14.3 ± 0.7)
0.04 ± 0.002
(0.9 ± 0.05)
0.22 ± 0.01
(5.7 ± 0.3)
Physical Data
B
C
AAD
PACKAGING:
5000/reel
1000/bulk
Sample Part No.
IRC Type
(IBT1/4, IBT1/2, or IBT1)
Resistance Value
(First two signifi cant fi gures plus third digit multiplier)
Example: 223 = 22 KΩ
510 = 51 Ω
2R0 = 2.0 Ω
Tolerance
J = ±5.0% K = ±10%
LF
Provides clear "Lead Free" Designation
Packaging Type
Lead Tape = LTR Bulk = Blank
Ordering Data
IBT1 203 J LF LTR
IBT Series
Carbon Composition Resistor
IBT Series Issue September 2010 Sheet 2 of 2
