Carbon Composition Resistors
Type CBT Series
Literature No. 1773192
Issued: 12-05
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
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Key Features
■Designed for Pulse Withstand
■Range of Resistance
Tolerances
■Solid Carbon Composition
■Low Cost, High Performance
■Two Sizes Available
■Wide Range of Resistance
Values
■Supplied Ammo Pack in
boxes of 2000
Type CBT Series
The CBT series of resistors is
constructed utilising solid carbon
composition, which is the traditional
medium for absorbing high energy
pulses, in cases of high inrush current.
These resistors have evolved over
many years to have excellent pulse
withstand capabilities, whilst remaining
very stable. These improved
characteristics have been achieved by
prudent selection of materials of
optimum physical properties and
by advances in the manufacturing
process.
Characteristics -
Electrical
Characteristics -
Environmental
Operating Temperature Range: -55°C to +125°C
Temperature Cycles: ∆R/R ± 2%
(-55°C to +125°C, 5 cycles)
Load Life (1000 hours at 70°C): ∆R/R ± 10%
Resistance to Solder Heat: ∆R/R ± 3%
(350°C for 3 seconds)
Short Time Overload: ∆R/R ± 2%
(2.5 x Rated Power for 5 seconds)
Humidity (40°C, 95%RH, 240 hrs): ∆R/R ± 3%
CBT25 CBT50
Power at 70°C Ambient: 0.25 Watts Derating to 0 at +125°C 0.5 Watts Derating to 0 at +125°C
Maximum Voltage: 250 Volts 350 Volts
Resistance Range: 1R0 - 5M6 1R0 - 22M
Resistance Values: 5% E24 Series 10% E12 Series 20% E6 Series
Voltage Coefficient: ± 0.035%/V ± 0.035%/V
Limiting Element Voltage: 250 Volts 350 Volts
Maximum Overload Voltage: 400 Volts 700 Volts
Insulation Resistance: 1000 M minimum
Dimensions-
Style L D l d
CBT25 6.3 ± 0.7 2.4 ± 0.1 27 min. 0.6
CBT50 9.5±0.8 3.6±0.2 25 min. 0.7
Pulse Withstand Characteristics
Charging and Discharging a 2000 pF Capacitor for 100 Cycles
How to Order
CBT 25 J 10K
Common Part
25 - 0.25W
50 - 0.5W
Size
1 ohm
(1 ohm) 1R0
1K ohm
(1000 ohms) 1K
100K ohm
(100000 ohms) 100K
1M ohm
(1000000 ohms) 1M
Resistance Value
Tolerance
Carbon Composition
Resistor
J - ±5%
K - ±10%
M - ±20%
0 2 4 6 8 10 12 14
Voltage (kv)
10
0
-10
-20
-30
∆R/R(%)
a
b
c
CBT25
a: 1.2MΩ
b: 33kΩ
c: 1kΩ
0 2 4 6 8 10 12 14
Voltage (kv)
10
0
-10
-20
-30
∆R/R(%)
a
b
c
CBT50
a: 1.2MΩ
b: 10kΩ
c: 1kΩ
