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