Rev Date: 12/20/2011 1 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
CB Series
Ceramic Housed with Axial Leads Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
• Fireproof power wirewound
• High thermal conductivity
• Non-inductive styles available
• Body standoffs available; add “F” after CB
• RoHS compliant / lead-free
0.5% 1% 5% 10%
CB2 2W - - 0.1 - 300 0.1 - 300
CB3 3W - - 0.1 - 680 0.1 - 680
CB5 5W - - 0.1 - 680 0.1 - 680
CB7 7W - - 0.1 - 1.5K 0.1 - 1.5K
CB10 10W - - 0.1 - 2K 0.1 - 2K
CB15 15W - - 0.15 - 2K 0.15 - 2K
CB20 20W - - 0.2 - 2K 0.2 - 2K
CB22 22W - - 1 - 250 1 - 250
CB25 25W - - 0.2 - 2K 0.2 - 2K
CB30 30W - - 1 - 250 1 - 250
WCB2 2W 1 - 5K 0.1 - 5K 0.1 - 5K -
WCB3 3W 1 - 10K 0.1 - 10K 0.1 - 10K -
WCB5 5W 1 - 10K 0.1 - 10K 0.1 - 10K -
WCB7 7W 1 - 15K 0.1 - 15K 0.1 - 15K -
WCB10 10W 1 - 20K 0.1 - 20K 0.1 - 20K -
WCB15 15W 1 - 20K 0.1 - 20K 0.1 - 20K -
MCB3 3W - - 1 - 500K -
MCB5 5W - - 1 - 500K -
MCB7 7W - - 1 - 500K -
Resistance Temperature Coefficient Standard:
CB series: ±800ppm below 1Ω & ±300ppm for 1Ω and above; WCB series: ±50ppm from 0.1Ω to 10Ω & ±20ppm above 10Ω;
MCB series: ±200ppm
Ohmic Range(Ω) and Tolerance
Type / Code Power Rating
(Watts) @ 70ºC
Electrical Specifications
Power Derating Curve:
120
100
80
60
40
20
25 275 325
Ambient Temperature (ºC)
75 125 175 225
Percent Rated Power (%)
Rev Date: 12/20/2011 2 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
CB Series
Ceramic Housed with Axial Leads Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Moisture Resistance ± 5%
Thermal Shock ± 2%
Load Life
@
70°C - 1,000 hrs. ± 5%
Resistance to Soldering Heat ± 2%
Short Time Overload - 5xPn for 5sec ± 2%
Dielectric Withstanding Voltage ± 2%
Test Test Results
Operating Temperature Range: -55°C to +275°C
0.700 ± 0.039 0.245 ± 0.039 0.255 ± 0.039 0.032 ± 0.002 0.300 ± 0.039 1.500 ± 0.250 inches
17.8 ± 1.0 6.2 ± 1.0 6.5 ± 1.0 0.8 ± 0.1 7.6 ± 1.0 38.1 ± 6.4 mm
0.875 ± 0.039 0.312 ± 0.039 0.312 ± 0.039 0.032 ± 0.002 0.375 ± 0.039 1.500 ± 0.250 inches
22.2 ± 1.0 7.9 ± 1.0 7.9 ± 1.0 0.8 ± 0.1 9.5 ± 1.0 38.1 ± 6.4 mm
0.875 ± 0.039 0.375 ± 0.039 0.375 ± 0.039 0.032 ± 0.002 0.437 ± 0.039 1.500 ± 0.250 inches
22.2 ± 1.0 9.5 ± 1.0 9.5 ± 1.0 0.8 ± 0.1 11.1 ± 1.0 38.1 ± 6.4 mm
1.400 ± 0.039 0.375 ± 0.039 0.375 ± 0.039 0.036 ± 0.002 0.500 ± 0.039 1.500 ± 0.250 inches
35.6 ± 1.0 9.5 ± 1.0 9.5 ± 1.0 0.9 ± 0.1 12.7 ± 1.0 38.1 ± 6.4 mm
1.875 ± 0.039 0.375 ± 0.039 0.375 ± 0.039 0.036 ± 0.002 0.500 ± 0.039 1.500 ± 0.250 inches
47.6 ± 1.0 9.5 ± 1.0 9.5 ± 1.0 0.9 ± 0.1 12.7 ± 1.0 38.1 ± 6.4 mm
1.875 ± 0.039 0.500 ± 0.039 0.500 ± 0.039 0.036 ± 0.002 0.625 ± 0.039 1.500 ± 0.250 inches
47.6 ± 1.0 12.7 ± 1.0 12.7 ± 1.0 0.9 ± 0.1 15.9 ± 1.0 38.1 ± 6.4 mm
2.500 ± 0.039 0.500 ± 0.039 0.500 ± 0.039 0.036 ± 0.002 0.625 ± 0.039 1.500 ± 0.250 inches
63.5 ± 1.0 12.7 ± 1.0 12.7 ± 1.0 0.9 ± 0.1 15.9 ± 1.0 38.1 ± 6.4 mm
2.500 ± 0.039 0.500 ± 0.039 0.500 ± 0.039 0.036 ± 0.002 0.625 ± 0.039 1.500 ± 0.250 inches
63.5 ± 1.0 12.7 ± 1.0 12.7 ± 1.0 0.9 ± 0.1 15.9 ± 1.0 38.1 ± 6.4 mm
2.500 ± 0.039 0.500 ± 0.039 0.500 ± 0.039 0.036 ± 0.002 0.625 ± 0.039 1.500 ± 0.250 inches
63.5 ± 1.0 12.7 ± 1.0 12.7 ± 1.0 0.9 ± 0.1 15.9 ± 1.0 38.1 ± 6.4 mm
2.500 ± 0.039 0.625 ± 0.039 0.625 ± 0.039 0.036 ± 0.002 1.500 ± 0.250 inches
63.5 ± 1.0 15.9 ± 1.0 15.9 ± 1.0 0.9 ± 0.1 38.1 ± 6.4 mm
-
CB10, WCB10
CB15, WCB15
CB5, WCB5,
MCB5
Type / Code
CB2, WCB2
CB3, WCB3,
MCB3
CB20
CB22
CB25
CB30
CB7, WCB7,
MCB7
Unit
A
Body Length
B
Height
C
Width
D
Lead Diameter
E
Height with
Standoff
F
Lead Length
Mechanical Specifications
Performance Characteristics
Rev Date: 12/20/2011 3 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
CB Series
Ceramic Housed with Axial Leads Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
How to Order
123456789
CB2JB100R
Series Code
CB 2 Code Quantity
WCB 3D
MCB 5 F
CBF 7 J 500
WCBF 10 K
MCBR 15
NCB 20
NCBF 22 100
25
30
2
3
5
7
10
15
3
5
7
Packaging
WCB
MCB
1%
5%
10%
15W
3W
5W
7W
3W
5W
7W
10W
22W
25W
30W
2W
7W
10W
15W
20WNon-inductive
Non-inductive with standoff
Standard
With standoff Bulk
MCB 7
CB20, CB22, CB25, CB30
CB7, CB10, CB15
WCB7, WCB10, WCB15
Four characters with
the multiplier used as
the decimal holder.
3.32 Kohm = 3K32
0.1 ohm = R100
33 ohm = 33R0
2W Tol
250
MCB3, MCB5 750
3W 0.5%
WCB2, WCB3, WCB5
5W
CB2, CB3, CB5
CB B
Product Series Power Tolerance
Code Description Size
Resistance Value
Legacy Part Number (before January 3, 2011):
Nominal
Resistance Tolerance
100 5%
Code Description Tolerance SEI Types Pkg Qty Description Code
CB 0.5% CB2,CB3,CB5,MCB3,MCB5 750
WCB 1% WCB2,WCB3,WCB5 500
MCB 5%
CBF 10%
WCBF CB20,CB22,CB25,CB30 100
MCBF
NCB Non inductive
25
30
Non inductive
with standoff
NCBF
2
3
5
7
10
15
20
22
Bulk B
CB 2 B
Code
Standard
With standoff
CB7,CB10,CB15,WCB7
WCB10,WCB15,MCB7 250
SEI Type Code Packaging
