WWF Series
Stackpole Electronics, Inc.
General Purpose Fusing Wirewound Resistor
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
100% RoHS compliant and lead free without exemption
Halogen free
Bulk packaging available – contact Stackpole for package quantities
Electrical Specifications
Type / Code
Dielectric
Strength (V)
Power Rating
@ 25ºC (W)
Power Rating
@ 70ºC (W)
TCR (ppm/ºC)
WWF12
WWF1
WWF1A
WWF2
WWF2A
WWF3
WWF3A
WWF4
WWF5
WWF7
WWF7B
WWF10
500
500
500
1000
1000
1000
1000
1000
1000
1000
1000
1000
0.6
1.2
1.5
2.5
3
3.7
4
5
6
8.5
9
13
0.5
1.1
1.3
2.1
2.6
3.2
3.4
4.3
5.1
7.2
7.7
11
± 20 ppm/ºC
Ohmic Range (Ω) and
Tolerance
5%
10 - 2 K
10 - 3 K
10 - 7 K
10 - 10 K
10 - 15 K
10 - 22 K
10 - 30 K
10 - 40 K
10 - 50 K
10 - 70 K
10 - 100 K
10 - 150 K
Max Voltage Rating = √P*R
Mechanical Specifications
Type / Code
A
B
C
0.312 ± 0.062
0.110 ± 0.031
0.025 ± 0.002
WWF12
7.92 ± 1.57
2.79 ± 0.79
0.62 ± 0.05
0.375 ± 0.062
0.110 ± 0.031
0.025 ± 0.002
WWF1
9.53 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.420 ± 0.062
0.110 ± 0.031
0.025 ± 0.002
WWF1A
10.67 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.370 ± 0.062
0.156 ± 0.031
0.032 ± 0.002
WWF2
9.40 ± 1.57
3.96 ± 0.79
0.81 ± 0.05
0.550 ± 0.062
0.156 ± 0.031
0.032 ± 0.002
WWF2A
13.97 ± 1.57
3.96 ± 0.79
0.81 ± 0.05
0.560 ± 0.062
0.187 ± 0.031
0.032 ± 0.002
WWF3
14.22 ± 1.57
4.75 ± 0.79
0.81 ± 0.05
0.500 ± 0.062
0.218 ± 0.031
0.032 ± 0.002
WWF3A
12.70 ± 1.57
5.54 ± 0.79
0.81 ± 0.05
0.700 ± 0.062
0.270 ± 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
1.000 ± 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
1.780 ± 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 0.04" (1.02 mm)
Rev Date: 11/23/2020
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
1
D
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
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.
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
www.seielect.com
marketing@seielect.com
WWF Series
Stackpole Electronics, Inc.
General Purpose Fusing Wirewound Resistor
Resistive Product Solutions
Performance Characteristics
Test
Fuse Test @ 220 Vac
Moisture Resistance
Load Life
Temperature Cycling
Short Time Overload
Test Specification
(1)
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.
Operating temperature range is -55°C to +350°C
Power Derating Curve:
Recommended Solder Profile
This information is intended as a reference for solder profiles for Stackpole resistive components. These profiles should
be compatible with most soldering processes. These are only recommendations. Actual numbers will depend on board
density, geometry, packages used, etc., especially those cells labeled with “*”.
100% Matte Tin / RoHS Compliant Terminations
Soldering iron recommended temperatures: 330°C to 350°C with minimum duration.
Maximum number of reflow cycles: 3.
Wave Soldering
Description
Maximum
Recommended
Preheat Time
80 seconds
70 seconds
Temperature Diff.
140°C
120°C
Solder Temp.
260°C
250°C
Dwell Time at Max.
10 seconds
5 seconds
Ramp DN (°C/sec)
N/A
N/A
Temperature Diff. = Defference between final preheat stage and soldering stage.
Rev Date: 11/23/2020
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
2
Minimum
60 seconds
100°C
240°C
*
N/A
www.seielect.com
marketing@seielect.com
WWF Series
Stackpole Electronics, Inc.
General Purpose Fusing Wirewound Resistor
Resistive Product Solutions
Convection IR Reflow
Description
Maximum
Recommended
Minimum
Ramp Up (°C/sec)
Dwell Time > 217°C
Solder Temp.
Dwell Time at Max.
Ramp DN (°C/sec)
3°C/sec
150 seconds
260°C
30 seconds
6°C/sec
2°C/sec
90 seconds
245°C
15 seconds
3°C/sec
*
60 seconds
*
10 seconds
*
Recommended Lead Free Resistor Reflow Profile
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 3). 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 as
amended by Directive (EU) 2015/863/EU as regards the list of restricted substances.
RoHS Compliance Status
Standard
Product
Series
WWF
Description
Package /
Termination
Type
Standard
Series
RoHS
Compliant
Lead-Free
Termination
Composition
Lead-Free
Mfg. Effective Date
(Std Product Series)
Lead-Free
Effective Date
Code
(YY/WW)
General Purpose and Precision Fusing
Wirewound Resistor
Axial
YES
100% Matte Sn
Always
Always
“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.
Rev Date: 11/23/2020
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
WWF Series
Stackpole Electronics, Inc.
General Purpose Fusing Wirewound Resistor
Resistive Product Solutions
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
1
2
3
4
5
6
7
8
9
10
W
W
F
1
J
T
1
0
K
0
Product Series
General Purpose
WWF
Fusing
Wirewound
Size Power Rating
Code @ 25ºC @ 70ºC
12
0.6
0.5
1
1.2
1.1
1A
1.5
1.3
2
2.5
2.1
2A
3
2.6
3
3.7
3.2
3A
4
3.4
4
5
4.3
5
6
5.1
7
8.5
7.2
7B
9
7.7
10
13
11
Tolerance
Code Tol
J
5%
Rev Date: 11/23/2020
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
Packaging
Size
Quantity
WWF12, WWF1, WWF1A
2500
WWF2, WWF2A, WWF3, WWF4 2000
11" reel tape
WWF3A
750
WWF5, WWF7, WWF7B
50
WWF10
250
Code Description
T
4
Resistance Value
Four characters with
the multiplier used as
the decimal holder.
10 ohm - 10R0
2 Kohm = 2K00
100 Kohm = 100K
www.seielect.com
marketing@seielect.com
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