WWF Series
General Purpose and Precision Fusing Wirewound Resistor
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Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
Fuses quickly under continuous overload of 15X rated power or greater
High performance for low cost
High power to size ratio
High temperature silicone coating
RoHS compliant / lead-free
Bulk packaging available – contact Stackpole for
package quantities
Electrical Specifications
Type / Code
Dielectric
Strength (V)
Power Rating (Watts) @ 25ºC
Ohmic Range (Ω) and Tolerance (1)
0.1%, 0.5%, 1% and 5%
0.1 - 80K
0.1 - 40K
0.1 - 32K
0.1 - 19K
0.1 - 16K
0.1 - 13K
0.1 - 12K
0.1 - 10K
0.1 - 8K
0.1 - 6K
0.1 - 5K
0.1 - 4K
WWFH
500V
0.6W
WWF1
500V
1.2W
WWF1A
500V
1.5W
WWF2
1000V
2.5W
WWF2A
1000V
3.0W
WWF3
1000V
3.7W
WWF3A
1000V
4.0W
WWF4
1000V
5.0W
WWF5
1000V
6.0W
WWF7
1000V
8.5W
WWF7B
1000V
9.0W
1000V
13W
WWF10
(1) Standard TC as follows: ±90ppm below 1Ω, ±50ppm from 1 - 10Ω and ±20ppm above 10Ω
Performance Characteristics
Test
Fuse Test @ 220 Vac
Moisture Resistance
Load Life
Temperature Cycling
Short Time Overload
Results
Typically fuses in less than 1 second
1% max
1%
0.5%
1%
Rev Date: 07/27/2012
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
1
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WWF Series
General Purpose and Precision Fusing Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Power Derating Curve:
120
100
% of Rated Power
80
60
40
Characteristic "U"
Characteristic "V"
Characteristic "U" -55ºC to +275ºC
Characteristic "V" -55ºC to +350ºC
20
25
75
125
175
225
275
325
Ambient Temperature ºC
Mechanical Specifications
Type / Code
WWFH
A
B
C
0.312 ± 0.062
0.11 ± 0.031
0.025 ± 0.002
7.92 ± 1.57
2.79 ± 0.79
0.62 ± 0.05
0.375 ± 0.062
0.11 ± 0.031
0.025 ± 0.002
WWF1
9.53 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.42 ± 0.062
0.11 ± 0.031
0.025 ± 0.002
WWF1A
10.67 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.37 ± 0.062
0.156 ± 0.031
0.032 ± 0.002
WWF2
9.40 ± 1.57
3.96 ± 0.79
0.81 ± 0.05
0.55 ± 0.062
0.156 ± 0.031
0.032 ± 0.002
WWF2A
13.97 ± 1.57
3.96 ± 0.79
0.81 ± 0.05
0.56 ± 0.062
0.187 ± 0.031
0.032 ± 0.002
WWF3
4.75 ± 0.79
0.81 ± 0.05
14.22 ± 1.57
0.5 ± 0.062
0.218 ± 0.031
0.032 ± 0.002
WWF3A
12.70 ± 1.57
5.54 ± 0.79
0.81 ± 0.05
0.7 ± 0.062
0.27 ± 0.031
0.036 ± 0.002
WWF4
17.78 ± 1.57
6.86 ± 0.79
0.91 ± 0.05
0.875 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WWF5
22.23 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WWF7
25.40 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.2 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WWF7B
30.48 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.78 ± 0.062
0.375 ± 0.031
0.036 ± 0.002 (2)
WWF10
45.21 ± 1.57
9.53 ± 0.79
0.91 ± 0.05 (2)
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product
(2) Available in 0.040" (1.02 mm)
D
(Bulk) (1)
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
1.500 typ.
38.10 typ.
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
Rev Date: 07/27/2012
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
WWF Series
General Purpose and Precision Fusing Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
How to Order
1
2
3
4
5
6
7
8
9
10
W
W
F
1
F
T
1
0
K
0
Product Series
General Purpose and
WWF
Precision Fusing
Size
H
F1
F1A
F2
F2A
FW
F3A
F4
F5
F7
F7B
F10
Power
0.6W
1.2W
1.5W
2.5W
3W
3.7W
4W
5W
6W
8.5W
9W
13W
Tolerance
Tol
Code
0.1%
B
0.5%
D
1%
F
5%
J
Code
Description
T
11" reel tape
Size
WWFH, WWF1, WWF1A
WWF2, WWF2A, WWF3, WWF4
WWF3A
WWF5, WWF7, WWF7B
WWF10
Quantity
2,500
2,000
750
50
250
Resistance Value
Four characters with
the multiplier used as
the decimal holder.
0.1 ohm = R100
8 Kohm = 8K00
32 Kohm = 32K0
Legacy Part Number (before January 3
rd
, 2011):
SEI Type
Code
Nominal
Resistance
Tolerance
Packaging
WWF
Type
WWF
1
Code
H
1
1A
2
2A
3
3A
4
5
7
7B
10
10K
1%
Tolerance
0.1%
0.5%
1%
5%
Types
WWF H, WWF 1, WWF 1A
WWF 2, WWF 2A, WWF 3, WWF 4
WWF 3A
WWF 5, WWF 7, WWF 7B
WWF 10
R
Qty
2,500
2,000
750
500
250
Description
Code
11" Flange
R
Rev Date: 07/27/2012
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
3
www.seielect.com
marketing@seielect.com
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