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

Tolerances

Values

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

a

b

c

CBT25

a: 1.2M

Ω

b: 33k

Ω

c: 1k

Ω

0

2

4

6

8

10

12

14

Voltage (kv)

10

0

-10

-20

-30

a

b

c

CBT50

a: 1.2M

Ω

b: 10k

Ω

c: 1k

Ω