WW/MWW/NWW/WWS Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
•
•
•
•
•
•
•
•
•
•
•
•
WWS offers miniature size at higher power rating
High performance for low cost
High power to size ratio
MWW/NMWW – completely molded construction with welded terminations
Complete welded terminations
Tinned copper leads
Available in non-inductive styles
Tighter tolerances may be available for non-inductive styles.
Contact Stackpole with requirements.
High temperature silicone coating
RoHS compliant
Higher operating temperatures available
“B” packaging code denotes bulk packaging - contact Stackpole for package quantities
Electrical Specifications – WW, WWS, MWW
Power Rating (W)
Power Rating (W)
@ 125ºC
@ 70ºC
WW12
-
0.4 W
0.5 W
WW1
-
1W
1.1 W
WW1A
RW-70
1W
1.3 W
WW2
RW-69
1.5 W
2.1 W
WWS2
-
2.5 W
2.6 W
WW2A
-
2.5 W
2.6 W
WW3
RW-79
3W
3.2 W
WWS3
-
3W
3.2 W
WW3A
-
3W
3.4 W
WW4
-
4W
4.3 W
WWS4
RW-79
4W
4.3 W
WW5
RW-67, RW-74
5W
5.1 W
WWS5
-
5W
5.1 W
WW7
-
6.5 W
7.2 W
WWS7
RW-67, RW-74
6.5 W
7.2 W
WW7B
-
7W
7.7 W
WW10
RW-78
10 W
11 W
WWS10
-
10 W
11 W
MWW1
RW-70
1W
1.3 W
MWW3
RW-79
3W
3.2 W
MWW5
RW-67, RW-74
5W
5.5 W
MWW10
RW-68, RW-74
10 W
11 W
(*) Other resistance values available - contact factory for details.
Type / Code
MIL-R-26 Ref.
TCR (ppm/ºC)
Ohmic Range (Ω) and Tolerance (*)
0.1%
0.5%
1%
5%
5 - 2K
3 - 2K
5 - 2K
2 - 3K
1 - 5K
1 - 10K
0.5 - 10K
1 - 10K
0.5 - 10K
1 - 10K
0.5 - 10K
1 - 22K
0.5 - 22K
3 - 10K
1 - 10K
1 - 30K
0.5 - 30K
1 - 40K
0.5 - 40K
1 - 22K
0.5 - 22K
1 - 50K
0.5 - 50K
1 - 40K
0.5 - 40K
1 - 70K
0.5 - 70K
1 - 50K
0.5 - 50K
1 - 70K
0.5 - 70K
1 - 100K
0.5 - 100K
1 - 70K
0.5 - 70K
5 - 2K
3 - 20K
2 - 40K
2 - 80K
< 1Ω = ±90ppm/ºC
1Ω to 10Ω = ± 50ppm/ºC
>10Ω = ±20ppm/ºC
Electrical Specifications – Non-Inductive Styles
Power Rating (W) Power Rating (W)
@ 125ºC
@ 70ºC
NWW12
-
0.4 W
0.5 W
NWW1
-
1W
1.1 W
NWW1A
RW-70
1W
1.3 W
NWW2
RW-69
1.5 W
2.1 W
NWWS2
-
2.5 W
2.6 W
NWW2A
-
2.5 W
2.6 W
NWW3
RW-79
3W
3.2 W
NWWS3
-
3W
3.2 W
NWW3A
-
3W
3.4 W
NWW4
-
4W
4.3 W
NWWS4
RW-79
4W
4.3 W
NWW5
RW-67, RW-74
5W
5.1 W
NWWS5
-
5W
5.1 W
NWW7
-
6.5 W
7.2 W
NWWS7
RW-67, RW-74
6.5 W
7.2 W
NWW7B
-
7W
7.7 W
(*) Other resistance values available - contact factory for details.
Type / Code
MIL-R-26 Ref.
TCR (ppm/ºC)
Ohmic Range (Ω) and Tolerance (*)
1%
5%
10 - 1K
2 - 1.5K
1 - 2.5K
1 - 5K
1 - 5K
1 - 5K
1 - 11K
3 - 5K
1 - 15K
1 - 20K
1 - 11K
1 - 25K
1 - 20K
1 - 35K
1 - 25K
1 - 35K
< 1Ω = ±90ppm/ºC
1Ω to 10Ω = ± 50ppm/ºC
>10Ω = ±20ppm/ºC
Rev Date: 10/27/2017
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
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WW/MWW/NWW/WWS Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Electrical Specifications – Non-Inductive Styles (cont.)
Power Rating (W) Power Rating (W)
@ 125ºC
@ 70ºC
NWW10
RW-78
10 W
11 W
NWWS10
-
10 W
11 W
NMWW1
RW-70
1W
1.3 W
NMWW3
RW-79
3W
3.2 W
NMWW5
RW-67, RW-74
5W
5.5 W
NMWW10
RW-68, RW-74
10 W
11 W
(*) Other resistance values available - contact factory for details.
Type / Code
MIL-R-26 Ref.
TCR (ppm/ºC)
Ohmic Range (Ω) and Tolerance (*)
1%
5%
1 - 50K
1 - 35K
5 - 1K
3 - 10K
2 - 20K
2 - 40K
< 1Ω = ±90ppm/ºC
1Ω to 10Ω = ± 50ppm/ºC
>10Ω = ±20ppm/ºC
Performance Characteristics
Test
Moisture Resistance
Load Life
Temperature Cycling
Short Time Overload
Dielectric Withstand Voltage
Test Condition
1000 hours, 95% R.H., 40ºC
1000 hours,
cycled power 1.5 hours ON, 0.5 hours OFF, 25ºC
5 cycles, -55ºC to 200ºC
5 times rated power for 5 seconds
Resistor leads are grounded and high potential probe is
touched to the resistor body
Test Specification
1% max
1%
0.5%
1%
500V for (N)WW12, 1, 1A and 2S.
1000V for all others
Operating Temperature Range: -55ºC to +350ºC
Mechanical Specifications
Type / Code
WW12 / NWW12
A
B
C
0.312 ± 0.062
0.110 ± 0.031
0.025 ± 0.002
7.92 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.375 ± 0.062
0.110 ± 0.031
0.025 ± 0.002
WW1, WWS2 / NWW1, NWWS2
9.53 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.420 ± 0.062
0.110 ± 0.031
0.025 ± 0.002
WW1A / NWW1A
10.67 ± 1.57
2.79 ± 0.79
0.64 ± 0.05
0.370 ± 0.062
0.156 ± 0.031
0.032 ± 0.002
WW2, WWS3 / NWW2, NWWS3
9.40 ± 1.57
3.96 ± 0.79
0.81 ± 0.05
0.550 ± 0.062
0.156 ± 0.031
0.032 ± 0.002
WW2A / NWW2A
13.97 ± 1.57
3.96 ± 0.79
0.81 ± 0.05
0.560 ± 0.062
0.187 ± 0.031
0.032 ± 0.002
WW3, WWS4 / NWW3, NWWS4
14.22 ± 1.57
4.75 ± 0.79
0.81 ± 0.05
0.500 ± 0.062
0.218 ± 0.031
0.032 ± 0.002
WW3A / NWW3A
12.70 ± 1.57
5.54 ± 0.79
0.81 ± 0.05
0.700 ± 0.062
0.270 ± 0.031
0.036 ± 0.002
WW4, WWS5 / NWW4, NWWS5
17.78 ± 1.57
6.86 ± 0.79
0.91 ± 0.05
0.875 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WW5, WWS7 / NWW5, NWWS7
22.23 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.000 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WW7 / NWW7
25.40 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product.
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.
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
Rev Date: 10/27/2017
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
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WW/MWW/NWW/WWS Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Mechanical Specifications (cont.)
Type / Code
WW7B, WWS10 / NWW7B, NWWS10
A
B
C
D
(Bulk)
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)
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
1.200 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
30.48 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.780 ± 0.062
0.375 ± 0.031
0.040 ± 0.002
(2)
WW10 / NWW10
45.21 ± 1.57
9.53 ± 0.79
1.02 ± 0.05
0.385 ± 0.062
0.135 ± 0.031
0.032 ± 0.002
MWW1 / NMWW1
9.78 ± 1.57
3.43 ± 0.79
0.81 ± 0.05
0.560 ± 0.062
0.205 ± 0.031
0.032 ± 0.002
MWW3 / NMWW3
14.22 ± 1.57
5.21 ± 0.79
0.81 ± 0.05
0.925 ± 0.062
0.330 ± 0.031
0.036 ± 0.002
MWW5 / NMWW5
23.50 ± 1.57
8.38 ± 0.79
0.91 ± 0.05
1.965 ± 0.062
0.480 ± 0.031
0.040 ± 0.002
MWW10 / NMWW10
49.91 ± 1.57
12.19 ± 0.79
1.02 ± 0.05
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product.
(2) Lead diameter (C) available in 0.036" / 0.91mm.
Power Derating Curve:
100
-55ºC
100ºC
Percent Rated Power (%)
80
60
40
20
350ºC
0
-60
0
50
100
150
200
250
300
350
400
Ambient Temperature (ºC)
Rev Date: 10/27/2017
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
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WW/MWW/NWW/WWS Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Energy Handling Capability:
(Typical performance - for reference only.)
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
MWW
NWW
Description
Package /
Termination
Type
Axial
Axial
Standard
Series
RoHS
Compliant
YES
YES
Lead-Free Termination
Composition
Lead-Free
Mfg. Effective Date
(Std Product Series)
Jan-06
Jan-06
Lead-Free
Effective Date
Code
(YY/WW)
06/01
06/01
WW
General Purpose and Precision Leaded
Wirewound Resistor - Molded
General Purpose and Precision Leaded
Wirewound Resistor - Conformal Coated -
Non-Inductive
General Purpose and Precision Leaded
Wirewound Resistor - Conformal Coated -
Non-Inductive
100% Matte Sn
100% Matte Sn
Axial
YES
100% Matte Sn
Jan-06
06/01
Rev Date: 10/27/2017
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
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WW/MWW/NWW/WWS Series
General Purpose and Precision 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
1
2
3
4
5
6
7
8
9
W
W
1
F
T
1
K
0
0
Product Series
WW
Standard
WWS
Mini
MWW
Molded
NWW Non-Inductive
Mini
NWWS
Non-Inductive
Non-Inductive
NMWW
Molded
Type/Code
WW12 /
WW1 /
WW1A /
WW2 /
WWS2 /
WW2A /
WW3 /
WWS3 /
WW3A /
WW4 /
WWS4 /
WW5 /
WWS5 /
WW7 /
WWS7 /
WW7B /
WW10 /
WWS10 /
MWW1 /
MWW3 /
MWW5 /
MWW10 /
NWW12
NWW1
NWW1A
NWW2
NWWS2
NWW2A
NWW3
NWWS3
NWW3A
NWW4
NWWS4
NWW5
NWWS5
NWW7
NWWS7
NWW7B
NWW10
NWWS10
NMWW1
NMWW3
NMWW5
NMWW10
Power Rating
@ 125ºC @ 70ºC
0.4W
0.5 W
1W
1.1 W
1W
1.3 W
1.5W
2.1 W
2.5W
2.6 W
2.5W
2.6 W
3W
3.2 W
3W
3.2 W
3W
3.4 W
4W
4.3 W
4W
4.3 W
5W
5.1 W
5W
5.1 W
6.5W
7.2 W
6.5W
7.2 W
7W
7.7 W
10W
11.0 W
10W
11.0 W
1W
1.3 W
3W
3.2 W
5W
5.5 W
10W
11.0 W
Tolerance
Code Tol
B
0.1%
D
0.5%
F
1%
J
5%
Code
Description
T
11" Tape
and Reel
B
Bulk
Packaging
Size
Quantity
WW12 / NWW12
WW1 / NWW1
2,500
WWS2 / NWWS2
WW1A / NWW1A
MWW1 / NMWW1
WW2 / NWW2
WWS3 / NWWS3
WW2A / NWW2A
2,000
WW3 / NWW3
WWS4 / NWWS4
MWW3 / NMWW3
WW3A / NWW3A
WW4 / NWW4
WWS5 / NWWS5
WW5 / NWW5
500
WWS7 / NWWS7
WW7 / NWW7
WW7B / NWW7B
WWS10 / NWWS10
MWW5 / NMWW5
WW10 / NWW10
250
MWW10 / NMWW10
Contact Stackpole for
package quantities.
Resistance Value
Four characters
with the multiplier
used as the
decimal holder.
0.5 ohm = R500
1 ohm = 1R00
10 Kohm = 10K0
Rev Date: 10/27/2017
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
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