WWF Series
General Purpose Fusing Wirewound Resistor
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
WWF12
WWF1
WWF1A
WWF2
WWF2A
WWF3
WWF3A
WWF4
WWF5
WWF7
WWF7B
WWF10
Dielectric
Strength (V)
500V
500V
500V
1000V
1000V
1000V
1000V
1000V
1000V
1000V
1000V
1000V
Power Rating
(Watts) @ 25ºC
0.6W
1.2W
1.5W
2.5W
3.0W
3.7W
4.0W
5.0W
6.0W
8.5W
9.0W
13W
Power Rating
(Watts) @ 70ºC
0.5W
1.1W
1.3W
2.1W
2.6W
3.2W
3.4W
4.3W
5.1W
7.2W
7.7W
11W
TCR (ppm/ºC)
Ohmic Range (Ω) and
Tolerance
5%
10 - 2K
10 - 3K
10 - 7K
10 - 10K
10 - 15K
10 - 22K
10 - 30K
10 - 40K
10 - 50K
10 - 70K
10 - 100K
10 - 150K
±20ppm/ºC
Performance Characteristics
Test
Fuse Test @ 220 Vac (1)
Moisture Resistance
Load Life
Temperature Cycling
Short Time Overload
Test Specification
Typically fuses in less than 1 second
1% max
1%
0.5%
1%
Note (1): Valid only if resistance value is low enough that the test voltage causes overload of 15X rated power or more.
Power Derating Curve:
120
100
% of Rated Power
80
60
40
20
Characteristic "V" -55ºC to +350ºC
Characteristic "V"
25
75
125
175
225
275
325
375
Ambient Temperature ºC
Rev Date: 11/28/2016
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
WWF Series
General Purpose Fusing Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Mechanical Specifications
Type / Code
WWF12
WWF1
WWF1A
WWF2
WWF2A
WWF3
WWF3A
WWF4
WWF5
0.312
7.92
0.375
9.53
A
±
±
±
±
0.062
1.57
0.062
1.57
0.110
2.79
0.110
2.79
B
±
±
±
±
0.031
0.79
0.031
0.79
C
0.025
0.62
0.025
0.64
±
±
±
±
0.002
0.05
0.002
0.05
D
(Bulk)
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
1.500
38.10
(1)
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
0.420 ± 0.062
10.67 ± 1.57
0.370 ± 0.062
9.40 ± 1.57
0.550 ± 0.062
13.97 ± 1.57
0.560 ± 0.062
14.22 ± 1.57
0.500
12.70
0.700
17.78
±
±
±
±
0.062
1.57
0.062
1.57
0.110 ± 0.031
2.79 ± 0.79
0.156
3.96
0.156
3.96
0.187
4.75
0.218
5.54
0.270
6.86
±
±
±
±
±
±
±
±
±
±
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.025 ± 0.002
0.64 ± 0.05
0.032
0.81
0.032
0.81
0.032
0.81
0.032
0.81
0.036
0.91
±
±
±
±
±
±
±
±
±
±
0.002
0.05
0.002
0.05
0.002
0.05
0.002
0.05
0.002
0.05
0.875 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
22.23 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.000 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WWF7
25.40 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.200 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WWF7B
30.48 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
(2)
1.780 ± 0.062
0.375 ± 0.031
0.036 ± 0.002
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)
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
RoHS Compliance
Stackpole Electronics has joined the worldwide effort to reduce the amount of lead in electronic components and to meet the various
regulatory requirements now prevalent, such as the European Union’s directive regarding “Restrictions on Hazardous Substances”
(RoHS 2). As part of this ongoing program, we periodically update this document with the status regarding the availability of our
compliant components. All our standard part numbers are compliant to EU Directive 2011/65/EU of the European Parliament.
RoHS Compliance Status
Standard
Product
Series
Description
Package /
Termination
Type
Standard
Series
RoHS
Compliant
YES
Lead-Free Termination
Composition
Lead-Free
Mfg. Effective Date
(Std Product Series)
Lead-Free
Effective Date
Code
(YY/WW)
Always
WWF
General Purpose and Precision Fusing
Wirewound Resistor
Axial
100% Matte Sn
Always
Rev Date: 11/28/2016
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 Fusing Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
“Conflict Metals” Commitment
We at Stackpole Electronics, Inc. are joined with our industry in opposing the use of metals mined in the “conflict region” of the
Eastern Democratic Republic of the Congo (DRC) in our products. Recognizing that the supply chain for metals used in the
electronics industry is very complex, we work closely with our own suppliers to verify to the extent possible that the materials and
products we supply do not contain metals sourced from this conflict region. As such, we are in compliance with the requirements of
Dodd-Frank Act regarding Conflict Minerals.
Compliance to “REACH”
We certify that all passive components supplied by Stackpole Electronics, Inc. are SVHC (Substances of Very High Concern) free
and compliant with the requirements of EU Directive 1907/2006/EC, “The Registration, Evaluation, Authorization and Restriction of
Chemicals”, otherwise referred to as REACH. Contact us for complete list of REACH Substance Candidate List.
Environmental Policy
It is the policy of Stackpole Electronics, Inc. (SEI) to protect the environment in all localities in which we operate. We continually
strive to improve our effect on the environment. We observe all applicable laws and regulations regarding the protection of our
environment and all requests related to the environment to which we have agreed. We are committed to the prevention of all forms
of pollution.
How to Order
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W
W
F
1
J
T
1
0
K
0
Product Series
WWF
General Purpose
Fusing
Wirewound
Size
Code
12
1
1A
2
2A
3
3A
4
5
7
7B
10
Power
@ 25ºC
0.6W
1.2W
1.5W
2.5W
3W
3.7W
4W
5W
6W
8.5W
9W
13W
Power
@ 70ºC
0.5W
1.1W
1.3W
2.1W
2.6W
3.2W
3.4W
4.3W
5.1W
7.2W
7.7W
11W
Tolerance
Code
Tol
J
5%
Code
Description
T
11" reel tape
Packaging
Size
WWF12, WWF1, WWF1A
WWF2, WWF2A, WWF3, WWF4
WWF3A
WWF5, WWF7, WWF7B
WWF10
Resistance Value
Quantity
2,500
2,000
750
50
250
Four characters with
the multiplier used as
the decimal holder.
10 ohm - 10R0
2 Kohm = 2K00
100 Kohm = 100K
Rev Date: 11/28/2016
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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