WCB/WCBF/NWCB Series
Welded Ceramic Housed Axial Leaded Wirewound Resistor
Features:
•
•
•
•
•
•
•
Stackpole Electronics, Inc.
Resistive Product Solutions
Welded element on ceramic core
Low noise, high reliability compared to fiberglass core wirewounds
Fireproof power wirewound
High thermal conductivity
NWCB – Non-inductively Ayrton Perry winding
Body standoffs available; add “F” after WCB
RoHS compliant / lead-free
Electrical Specifications
Type / Code
WCB5, WCBF5
WCB7, WCBF7
WCB10, WCBF10
WCB15, WCBF15
WCB20, WCBF20
WCB25, WCBF25
NWCB5
NWCB7
NWCB10
NWCB15
NWCB20
NWCB25
Power Rating
(Watts) @ 70ºC
5W
7W
10W
15W
20W
25W
5W
7W
10W
15W
20W
25W
0.1Ω to 10Ω = ±50ppm/ºC
>10Ω = ±20ppm/ºC
TCR (ppm/ºC)
Ohmic Range(Ω) and Tolerance
0.5%
1 - 10K
1 - 15K
1 - 20K
1 - 20K
1 - 20K
1 - 20K
-
-
-
-
-
-
1%
0.1 - 10K
0.1 - 15K
0.1 - 20K
0.1 - 20K
0.1 - 20K
0.1 - 20K
0.1 - 4.7K
0.1 - 7.5K
0.1 - 10K
0.1 - 10K
0.1 - 10K
0.1 - 10K
5%
Mechanical Specifications
Type / Code
WCB5, WCBF5, NWCB5
WCB7, WCBF7, NWCB7
WCB10, WCBF10, NWCB10
WCB15, WCBF15, NWCB15
WCB20, WCBF20, NWCB20
WCB25, WCBF25, NWCB25
A
Body Length
0.875 ± 0.039
22.23 ± 0.99
1.400 ± 0.039
35.56 ± 0.99
1.875 ± 0.039
47.63 ± 0.99
1.875 ± 0.039
47.63 ± 0.99
2.500 ± 0.039
63.50 ± 0.99
2.500 ± 0.039
63.50 ± 0.99
B
Height
0.375 ± 0.039
9.53 ± 0.99
0.375 ± 0.039
9.53 ± 0.99
0.375 ± 0.039
9.53 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
C
Width
0.375 ± 0.039
9.53 ± 0.99
0.375 ± 0.039
9.53 ± 0.99
0.375 ± 0.039
9.53 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
D
Lead Diameter
0.036 ± 0.002
0.91 ± 0.05
0.036 ± 0.002
0.91 ± 0.05
0.036 ± 0.002
0.91 ± 0.05
0.036 ± 0.002
0.91 ± 0.05
0.036 ± 0.002
0.91 ± 0.05
0.036 ± 0.002
0.91 ± 0.05
E
(WCBF only)
0.437 ± 0.039
11.10 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
0.500 ± 0.039
12.70 ± 0.99
0.625 ± 0.039
15.88 ± 0.99
0.625 ± 0.039
15.88 ± 0.99
0.625 ± 0.039
15.88 ± 0.99
F
Lead Length
1.500 ± 0.250
38.10 ± 6.35
1.500 ± 0.250
38.10 ± 6.35
1.500 ± 0.250
38.10 ± 6.35
1.500 ± 0.250
38.10 ± 6.35
1.500 ± 0.250
38.10 ± 6.35
1.500 ± 0.250
38.10 ± 6.35
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
Rev Date: 01/14/2015
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
1
www.seielect.com
marketing@seielect.com
WCB/WCBF/NWCB Series
Welded Ceramic Housed Axial Leaded Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Performance Characteristics
Test
Moisture Resistance
Thermal Shock
Load Life @ 70°C - 1,000 hrs.
Resistance to Soldering Heat
Short Time Overload - 5xPn for 5sec
Dielectric Withstanding Voltage
Operating Temperature Range: -55°C to +275°C
Test Results
± 5%
± 2%
± 5%
± 2%
± 2%
± 2%
Power Derating Curve:
100
-55ºC
70ºC
Percent Rated Power (%)
80
60
40
20
0
-80
275ºC
-40
0
40
80
120
160
200
Ambient Temperature (ºC)
240
280
320
How to Order
1
2
3
4
5
6
7
8
9
10
W
C
B
5
J
B
1
0
0
R
Product Series
WCB
Standard
WCBF
With standoff
NWCB
Non-inductive
Code
5
7
10
15
20
25
Power
5W
7W
10W
15W
20W
25W
Tolerance
Code
Tol
D
0.5%
F
1%
J
5%
Code
B
Packaging
Description
Size
5
7, 10
Bulk
15
20
25
Resistance Value
Quantity
500
250
200
200
200
Four characters with
the multiplier used as
the decimal holder.
0.1 ohm = R100
33 ohm = 33R0
3.32 Kohm = 3K32
Rev Date: 01/14/2015
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
2
www.seielect.com
marketing@seielect.com
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