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
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.
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
(*)
Rev Date: 11/29/2021
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
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
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
A
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
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
B
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
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
C
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
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
Rev Date: 11/29/2021
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
WW5, WWS7 / NWW5, NWWS7
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
WW10 / NWW10
(2)
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.
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 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
Moisture Resistance
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: 11/29/2021
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
Recommended Solder Profiles
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
Minimum
60 seconds
100°C
240°C
*
N/A
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.
Convection IR Reflow
Description
Ramp Up (°C/sec)
Dwell Time > 217°C
Solder Temp.
Dwell Time at Max.
Ramp DN (°C/sec)
Maximum
3°C/sec
150 seconds
260°C
30 seconds
6°C/sec
Recommended
2°C/sec
90 seconds
245°C
15 seconds
3°C/sec
Minimum
*
60 seconds
*
10 seconds
*
Recommended Lead Free Resistor Reflow Profile
Rev Date: 11/29/2021
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
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
WW10, NWW10
MWW1, NMWW1
MWW3, NMWW3
MWW5, NMWW5
MWW10, NMWW10
Dimension "E":
A max
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
5.100
129.54
3.311
84.10
3.484
88.50
3.850
97.80
4.764
121.00
.(1)
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
11.000
279.40
13.504
343.00
13.504
343.00
13.504
343.00
13.504
343.00
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
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
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
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.500 ±
63.50 ±
2.874 ±
73.00 ±
2.874 ±
73.00 ±
2.874 ±
73.00 ±
4.375 ±
111.13 ±
2.063 ±
52.40 ±
2.063 ±
52.40 ±
2.874 ±
73.00 ±
4.375 ±
111.13 ±
(2)
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.079
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
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
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
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.
Rev Date: 11/29/2021
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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