WW / MWW / NWW / WWS Series
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
Features:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
WWS offers miniature size at higher power rating
High performance for low cost
High power to size ratio
High temperature silicone coating
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
Higher operating temperatures available
“B” packaging code denotes bulk packaging - contact Stackpole for package quantities
WW/NWW/WWS meet UL94V-0
100% RoHS compliant and lead free without exemption
Halogen free
REACH compliant
Electrical Specifications – WW, WWS, MWW
Power Rating (Watts)
TCR (ppm/ºC)
@ 125°C
@ 70°C
WW12
0.4
0.5
WW1
1
1.1
WW1A
RW-70
1
1.3
WW2
RW-69
1.5
2.1
WWS2
2.5
2.6
WW2A
2.5
2.6
WW3
RW-79
3
3.2
WWS3
3
3.2
WW3A
3
3.4
WW4
4
4.3
< 1 Ω = ± 90 ppm/ºC
WWS4
RW-79
4
4.3
1 Ω to 10 Ω = ± 50 ppm/ºC
WW5
RW-67, RW-74
5
5.1
> 10 Ω = ± 20 ppm/ºC
WWS5
5
5.1
WW7
6.5
7.2
WWS7
RW-67, RW-74
6.5
7.2
WW7B
7
7.7
WW10
RW-78
10
11
WWS10
10
11
MWW1
RW-70
1
1.3
MWW3
RW-79
3
3.2
MWW5
RW-67, RW-74
5
5.5
MWW10
RW-68, RW-74
10
11
(*) Other resistance values available - contact Stackpole for details.
Max Voltage Rating = √P*R
Type/Code
MIL-R-26 Ref.
Rev Date: 7/17/2023
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
1
(*)
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
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WW / MWW / NWW / WWS Series
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
Electrical Specifications – Non-Inductive Styles
Power Rating (Watts)
TCR (ppm/ºC)
@ 125°C @ 70°C
0.5
0.4
NWW12
1.1
1
NWW1
1.3
1
RW-70
NWW1A
2.1
1.5
RW-69
NWW2
2.6
2.5
NWWS2
< 1 Ω = ± 90 ppm/ºC
2.6
2.5
NWW2A
1 Ω to 10 Ω = ± 50 ppm/ºC
3.2
3
RW-79
NWW3
> 10 Ω = ± 20 ppm/ºC
3.2
3
NWWS3
3.4
3
NWW3A
4.3
4
NWW4
4.3
4
RW-79
NWWS4
5.1
5
RW-67, RW-74
NWW5
5.1
5
NWWS5
7.2
6.5
NWW7
7.2
6.5
RW-67, RW-74
NWWS7
7.7
7
NWW7B
< 1 Ω = ± 90 ppm/ºC
11
10
RW-78
NWW10
1 Ω to 10 Ω = ± 50 ppm/ºC
11
10
NWWS10
> 10 Ω = ± 20 ppm/ºC
1.3
1
RW-70
NMWW1
3.2
3
RW-79
NMWW3
5.5
5
RW-67, RW-74
NMWW5
11
10
RW-68, RW-74
NMWW10
(*) Other resistance values available - contact Stackpole for details.
Max Voltage Rating =
Type/Code
MIL-R-26 Ref.
Ohmic Range (Ω) and Tolerance
1% and 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
1 - 50K
1 - 35K
5 - 1K
3 - 10K
2 - 20K
2 - 40K
(*)
Mechanical Specifications
Type/Code
WW12 / NWW12
WW1, WWS2 / NWW1, NWWS2
WW1A / NWW1A
WW2, WWS3 / NWW2, NWWS3
WW2A / NWW2A
WW3, WWS4 / NWW3, NWWS4
WW3A / NWW3A
WW4, WWS5 / NWW4, NWWS5
A
0.312
7.92
0.375
9.53
0.420
10.67
0.370
9.40
0.550
13.97
0.560
14.22
0.500
12.70
0.700
17.78
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
Rev Date: 7/17/2023
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
B
0.062
1.57
0.062
1.57
0.062
1.57
0.062
1.57
0.062
1.57
0.062
1.57
0.062
1.57
0.062
1.57
0.110
2.79
0.110
2.79
0.110
2.79
0.156
3.96
0.156
3.96
0.187
4.75
0.218
5.54
0.270
6.86
2
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
C
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.031
0.79
0.025
0.64
0.025
0.64
0.025
0.64
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
0.002
0.05
0.002
0.05
0.002
0.05
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.
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
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WW / MWW / NWW / WWS Series
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
Mechanical Specifications (cont.)
Type/Code
A
B
C
0.875 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
22.23 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.025 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WW7 / NWW7
26.04 ± 1.57
7.92 ± 0.79
0.91 ± 0.05
1.225 ± 0.062
0.312 ± 0.031
0.036 ± 0.002
WW7B, WWS10 / NWW7B, NWWS10
31.12 ± 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" / 0.91 mm.
WW5, WWS7 / NWW5, NWWS7
D
(1)
(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.
1.500 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
Performance Characteristics
Test
Moisture Resistance
Test Condition
1000 hours, 95% R.H., 40ºC
1000 hours,
Load Life
cycled power 1.5 hours ON, 0.5 hours OFF, 25ºC
Temperature Cycling
5 cycles, -55ºC to 200°C
Short Time Overload
5 times rated power for 5 seconds
Resistor leads are grounded and high potential probe is
Dielectric Withstand Voltage
touched to the resistor body
Operating Temperature Range: -55ºC to +350ºC
Test Specification
1% max
1%
0.5%
1%
500V for (N)WW12, 1, 1A and 2S.
1000V for all others
Power Derating Curve:
Rev Date: 7/17/2023
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
3
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WW / MWW / NWW / WWS Series
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
Recommended Soldering Condition
Flow Soldering:
- Pre-heating: 110°C MAX
- Peak temperature/duration: 260°C
within 10 seconds (1st, 2nd wave total)
- Temperature profile (see chart on the right)
Iron Soldering:
- 380°C, 5 seconds, once/terminal
Packaging Specifications
Type/Code
WW12
WW1, WWS2
NWW1, NWWS2
WW1A, NWW1A
WW2, WWS3
NWW2, NWWS3
WW2A, NWW2A
WW3, WWS4
NWW3, NWWS4
WW3A, NWW3A
WW4,
NWW4,
WW5,
NWW5,
WWS5
NWWS5
WWS7
NWWS7
WW7, NWW7
WW7B, WWS10
NWW7B, NWWS10
A max.(1)
2.880
73.15
2.880
73.15
2.880
73.15
2.880
73.15
2.880
73.15
2.880
73.15
2.880
73.15
2.880
73.15
3.740
95.00
3.740
95.00
3.740
95.00
Rev Date: 7/17/2023
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
B max
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
11.000
279.40
0.197
5.00
0.197
5.00
0.197
5.00
0.197
5.00
0.197
5.00
0.197
5.00
0.394
10.00
0.394
10.00
0.394
10.00
0.394
10.00
0.394
10.00
4
C
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
D(2)
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.500 ± 0.079
63.50 ± 2.00
2.874 ± 0.079
73.00 ± 2.00
2.874 ± 0.079
73.00 ± 2.00
2.874 ± 0.079
73.00 ± 2.00
Tape
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
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WW / MWW / NWW / WWS Series
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
Packaging Specifications (cont.)
Type/Code
WW10, NWW10
MWW1, NMWW1
MWW3, NMWW3
MWW5, NMWW5
MWW10, NMWW10
A max.(1)
5.100
129.54
3.311
84.10
3.484
88.50
3.850
97.80
4.764
121.00
B max
11.000
279.40
13.504
343.00
13.504
343.00
13.504
343.00
13.504
343.00
0.394
10.00
0.197
5.00
0.394
10.00
0.394
10.00
0.600
15.24
C
±
±
±
±
±
±
±
±
±
±
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
0.020
0.50
D(2)
4.375 ± 0.079
111.13 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.063 ± 0.079
52.40 ± 2.00
2.874 ± 0.079
73.00 ± 2.00
4.375 ± 0.079
111.13 ± 2.00
Tape
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
Dimension "E":
This is a non-critical dimension that does not have a tolerance in the standard.
Range of diameters is from 0.547 inches (13.90 mm) to 1.500 inches (38.10 mm).
(1) Reference value only. The "A" dimension shall be governed by the overall length of the taped component.
The distance between flanges shall be 0.059 inches (1.50 mm) to 0.315 (8.00 mm) greater than the overall component.
(2) The given dimension "D" expresses the standard width spacing. A 26mm narrow spacing is available as option "N" packaging code.
Energy Handling Capability
(Typical performance – for reference only.)
Rev Date: 7/17/2023
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
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
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
MWW
NWW
WW
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)
Axial
YES
100% Matte Sn
Jan-06
06/01
Axial
YES
100% Matte Sn
Jan-06
06/01
Axial
YES
100% Matte Sn
Jan-06
06/01
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
“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.
Rev Date: 7/17/2023
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
6
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WW / MWW / NWW / WWS Series
Stackpole Electronics, Inc.
General Purpose and Precision Wirewound Resistor
Resistive Product Solutions
How to Order
W
Series
WW (Standard)
NWW (Non-inductive)
WWS (Mini)
NWWS (Non-inductive Mini)
MWW (Molded)
NMWW (Non-inductive Molded)
W
Code
12
1
1A
2
2A
3
3A
4
5
7
7B
10
2
3
4
5
7
10
1
3
5
10
1
Power Rating (W)
@ 125ºC
@ 70ºC
0.4
0.5
1
1.1
1
1.3
1.5
2.1
2.5
2.6
3
3.2
3
3.4
4
4.3
5
5.1
6.5
7.2
7
7.7
10
11.0
2.5
2.6
3
3.2
4
4.3
5
5.1
6.5
7.2
10
11.0
1
1.3
3
3.2
5
5.5
10
11.0
F
T
Tolerance
Code Tol
B
0.1%
D
0.5%
F
1%
J
5%
1
T
This specification may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
7
0
0
Packaging
Size
Qty
WW12 / NWW12
WW1 / NWW1
WWS2 / NWWS2 2500
WW1A / NWW1A
MWW1 / NMWW1
WW2 / NWW2
WWS3 / NWWS3
WW2A / NWW2A
2000
WW3 / NWW3
WWS4 / NWWS4
11" Tape
MWW3 / NMWW3
and Reel
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
Bulk
package quantities.
Code Description
B
Rev Date: 7/17/2023
K
Resistance Value
Four characters
with the multiplier
used as the
decimal holder.
0.5 ohm = R500
1 ohm = 1R00
10 Kohm = 10K0
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