Carbon Composition Resistors
Key Features
Type CBT Series
Solid Carbon
Composition
Designed for
Pulse
Withstand
Low Cost, High
Performance
Two Sizes
Available
Supplied
Ammo Pack in
boxes of 2000
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
Power @ 70°C
Maximum Voltage
Tolerance
Selection Series
Resistance values
Ω
Limiting Element
Voltage
Maximum Overload
Voltage
Insulation Resistance
Operating Temperature
CBT25
0.25W (~0 @ 125°C)
250V
5%
10%
10% 20%
E24
E24
E12
E6
100K –
1 -91K
1 – 5M6
5M6
250v
CBT50
0.5W (~0 @ 125°C)
350V
5%
10%
10% 20%
E24
E24
E12 E6
1 – 91K 100K –
1 – 22M
22M
350v
500v
700v
1000M minimum
-55 ~ +125
Climatic Category
55/125/56
Lower Category Temperature
Upper Category Temperature
Damp Heat Steady State Duration
-55°C
+125°C
56 Days
Stability Class
10%
1773192 Rev D 03/2019
Limits For Change of Resistance
For Long Term Tests
For Short Term Tests
Dimensions in
millimetres unless
otherwise specified
Dimensions Shown for
reference purposes only.
Specifications subject to
change
±(10%+0.5Ω)
±(2%+0.1Ω)
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Carbon Composition Resistors
Derating
At ambient temperatures in excess of 70°C the resistor shall be derated in
accordance with the following curve:
Rated Voltage
D.C. or A.C. rms voltage calculated from the square root of the product of the
rated resistance and the rated dissipation.
Where the calculated rated voltage is higher than the limiting element voltage,
the limiting element voltage must be applied.
Dimensions
1773192 Rev D 03/2019
CBT25
L
6.3±0.7
CBT50
9.5
Dimensions in
millimetres unless
otherwise specified
+0.8
-0.7
ØD
2.4±0.1
l
30±3
Ød
0.6±0.05
3.6±0.2
25±3
0.7
Dimensions Shown for
reference purposes only.
Specifications subject to
change
+0.07
-0.05
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go to: www.te.com/help
Carbon Composition Resistors
Performance Characteristics
Test Item
Condition of Test (JIS C 5201-1)
Visual Examination
Sub-clause 4.4.1
Checked by visual examination
Dimension
Sub-clause 4.4.2
Resistance
Sub-clause 4.5
Voltage Proof
Solderability
Overload
(mounted)
Terminal strength
Tensile
Bending
Torsion
1773192 Rev D 03/2019
Dimensions in
millimetres unless
otherwise specified
Sub-clause 4.7
Method: V-Block Method
Test Voltage: Alternating
voltage with a peak value of
1.42 times the insulation
voltage.
Duration 60s ±5s
Sub-clause 4.17
Without ageing
Method 1 (solder bath
method)
Bath Temperature: 235°C±5°C
Immersion time: 5s ±0.5s
Immersion depth: A point
within about 4mm from the
resistor body.
Sub-clause 4.13
The applied voltage shall be 2.5
times RCWV or 2 times limiting
element voltage, whichever is
lower.
Duration: 5s
Visual Examination
Resistance test
Sub-clause 4.16
Sub-clause 4.16.2
Force: 10N
Duration: 10s ±1s
Sub-clause 4.16.3
Method 1
Bending times: 2 times
Bending force: 5N
Sub-clause 4.16.4
Method A, Severity 2
(2 successive rotations of 180°)
Dimensions Shown for
reference purposes only.
Specifications subject to
change
Performance
Requirement
As per 4.4.1 Marking shall
be legible as checked
visually
As specified
As specified
Resistance value shall
correspond to the rated
resistance value taking
into account the
specified tolerance
No breakdown or
flashover
Good tinning as
evidenced by free flowing
of the solder with
wetting of the
terminations
No Visible Damage
Legible Marking
ΔR ±(2%+0.1Ω)
No visible damage
ΔR ±(2%+0.1Ω
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Carbon Composition Resistors
Resistance to
soldering heat
Rapid Temperature
change
Vibration
Climatic sequence
Dry Heat
Damp Heat, cycle
(12 + 12h cycle
First Cycle
Cold
Low air pressure
Damp heat, cycle
(12 + 12h cycle)
Remaining cycle
D.C. load
Endurance @ 70°C
1773192 Rev D 03/2019
Dimensions in
millimetres unless
otherwise specified
Sub-clause 4.18
Method 1B
Solder Temperature:
CBT25: 300°C±10°C
CBT50: 350°C±10°C
Immersion time: 3.5s±0.5s
Immersion depth: A point within
4.0±0.8mm from the resistor body.
Sub-clause 4.19
Lower category temperature: 55°C
Upper category temperature:
125°C
Duration of exposure at each
temperature: 30 min.
Number of cycles: 5
Sub-Clause 4.22
Endurance by sweeping
Frequency range: 10Hz – 500Hz
Amplitude: 0.75mm or
acceleration 98m/s²
(whichever is less severe)
Total Duration: 6h
Sub-clause 4.23
Sub-clause 4.23.2
Test temperature: 125°C
Duration 16h
Sub-clause 4.23.3
Test Method: 2
Test temperature: 55°C
(Severity (2))
Sub-clause 4.23.4
Test temperature: -55°C
Duration: 2h
8kPa
Sub-clause 4.23.6
Test method: 2
Test temperature: 55°C
(Severity (2))
Number of cycles: 5
Sub-clause 4.23.7
The applied voltage shall be the
rated voltage or the limiting
element voltage, whichever is
smaller.
Duration: 1 min.
Sub-clause 4.25.1
Ambient temperature: 70°C±2°C
Duration: 1000h
Voltage applied 1.5h on and 0.5h
off
The applied voltage shall be the
rated voltage or the limiting
element voltage, whichever is
smaller
Examination at 48h, 500h and
1000h
Dimensions Shown for
reference purposes only.
Specifications subject to
change
No Visible Damage
Legible marking
ΔR ± %+ . Ω
No visible damage
ΔR ± %+ . Ω
No visible damage
ΔR ± %+ . Ω
No Visible Damage
Legible marking
ΔR ± %+ .5Ω
Insulation Resistance:
R
MΩ
No visible damage
ΔR ± %+ .5Ω
Insulation Resistance:
R GΩ
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Carbon Composition Resistors
Variation of
Resistance with
Temperature
Damp Heat, Steady
State
Endurance at upper
category temperature
At -55°C
Resistance
Temp.
Range
Coefficient
R KΩ
+6.5-0(%)
R
KΩ
+10-0(%)
R
KΩ
+13-0(%)
R MΩ
+15-0(%)
R> MΩ
+20-0%
At +125°C
Resistance
Temp.
Range
Coefficient
R KΩ
+1-5(%)
R
KΩ
0-6(%)
R
KΩ
0-7.5(%)
R MΩ
0-10(%)
R> MΩ
0-15(%)
Sub-clause 4.8
-55°C / +20°C
+20°C / +125°C
Sub-clause 4.24
Ambient Temperature: 40°C±2°C
Relative Hu idity: 9 ⁺²/₋ %
a) 1st group: without
voltage applied
b) 2nd group: DC voltage
applied continuously in
accordance with subclause 4.24.2.1b
c) 3rd group: DC voltage –
20v±2v shall be applied
continuously.
Sub-clause 4.25.3
Ambient temperature: 125°C±2°C
Duration: 1000h
Examination at 48h, 500h and
1000h
Visual examination
Resistance
At 1000h only: Insulation
Resistance
No Visible Damage
Legible marking
ΔR ±
%+ .5Ω
Insulation resistance
MΩ
No Visible Damage
ΔR ± %+ .5Ω
I sulatio Resista ce
GΩ
Packaging
Taping in accordance with JIS C 0806-1:1999
W
CBT25
CBT50
1773192 Rev D 03/2019
52.4
+1.6
-1.4
Dimensions in
millimetres unless
otherwise specified
P
L -L
Z
S
T
t
5.08±0.38
1.0 max
1.0 max
3.2 min
6.0±0.5
0.5 max
Dimensions Shown for
reference purposes only.
Specifications subject to
change
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go to: www.te.com/help
Carbon Composition Resistors
Packaging
Notes:
The direction of the color codes should be unified.
No component shall be missed.
Wire leads shall be free from kinks and bends.
Pitch tolerance is 2mm for 20 pitches (100±2mm).
The edge waving on tape shall not be more than ±1.0mm through a length of
300mm.
The reinforcement of the tape cutting should be reinforced by a new tape
(30mm min) in 3mm limits and ensuring 1 pitch dimension as shown below.
Tape in Box (Ammo Pack)
Code
CBT25
CBT50
No Code
Qty per Box
2000
2000
a
60±5
65±5
b
75±5
75±5
C
275±5
455±5
How To Order
1773192 Rev D 03/2019
CBT
Common Part
25
Size
J
Tolerance
CBT – Carbon
Composition
Resistor
25 – 0.25W
50 – 0.5W
J – 5%
K – 10%
M – 20%
Dimensions in
millimetres unless
otherwise specified
Dimensions Shown for
reference purposes only.
Specifications subject to
change
10K
Resistance Value
1Ω - 1R0
100Ω - 100R
1000Ω KΩ - 1K0
100000Ω (100KΩ - 100K
1000000Ω (1MΩ - 1M0
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go to: www.te.com/help
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