WW/MWW/NWW Series
General Purpose and Precision Wirewound Resistor
Features:
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Stackpole Electronics, Inc.
Resistive Product Solutions
WWS offers miniature size at higher power rating
High performance for low cost
High power to size ratio
MWW – completely molded construction with welded terminations
Complete welded terminations
Tinned copper leads
Available in non-inductive styles
High temperature silicone coating
RoHS compliant
Higher operating temperatures available
Bulk packaging available - contact Stackpole for package quantities
Electrical Specifications
Type / Code
MIL-R-26 Ref.
Dielectric
Strength (V)
(1)
Power Rating
(Watts)
@ 125ºC
0.4W
1W
1W
1.5W
2.5W
2.5W
3W
3W
3W
4W
4W
5W
5W
6.5W
6.5W
7W
10W
10W
1W
3W
5W
10W
Power Rating
(Watts)
@ 70ºC
0.5 W
1.1 W
1.3 W
2.1 W
2.6 W
2.6 W
3.2 W
3.2 W
3.4 W
4.3 W
4.3 W
5.1 W
5.1 W
7.2 W
7.2 W
7.7 W
11.0 W
11.0 W
1.3 W
3.2 W
5.5 W
11.0 W
TCR (ppm/ºC)
Ohmic Range(Ω) and Tolerance
0.1%, 0.5%, 1% & 5%
Standard
Non-Inductive
0.1 - 2K
0.1 - 1K
0.1 - 3K
0.1 - 1.5K
0.1 - 7K
0.1 - 3.5K
0.1 - 10K
0.1 - 5K
0.1 - 3K
0.1 - 1.5K
0.1 - 15K
0.1 - 7.5K
0.1 - 22K
0.1 - 11K
0.1 - 10K
0.1 - 5K
0.1 - 30K
0.1 - 15K
0.1 - 40K
0.1 - 20K
0.1 - 22K
0.1 - 11K
0.1 - 50K
0.1 - 25K
0.1 - 40K
0.1 - 20K
0.1 - 70K
0.1 - 35K
0.1 - 50K
0.1 - 25K
0.1 - 100K
0.1 - 50K
0.1 - 150K
0.1 - 75K
0.1 - 100K
0.1 - 50K
-
0.1 - 2K
-
0.1 - 20K
-
0.1 - 40K
-
0.1 - 150K
WW12 / NWW12
-
500V
WW1 / NWW1
-
500V
WW1A / NWW1A
RW-70
500V
WW2 / NWW2
RW-69
1,000V
WWS2 / NWWS2
-
500V
WW2A / NWW2A
-
1,000V
WW3 / NWW3
RW-79
1,000V
WWS3 / NWWS3
-
1,000V
WW3A / NWW3A
-
1,000V
WW4 / NWW4
-
1,000V
WWS4 / NWWS4
RW-79
1,000V
WW5 / NWW5
RW-67, RW-74
1,000V
WWS5 / NWWS5
-
1,000V
WW7 / NWW7
-
1,000V
WWS7 / NWWS7
RW-67, RW-74
1,000V
WW7B / NWW7B
-
1,000V
WW10 / NWW10
RW-78
1,000V
WWS10 / NWWS10
-
1,000V
MWW1 / NMWW1
RW-70
1,000V
MWW3 / NMWW3
RW-79
1,000V
MWW5 / NMWW5
RW-67, RW-74
1,000V
MWW10 / NMWW10 RW-68, RW-74
1,000V
(1) Lesser of
√PR
or maximum working voltage
< 1Ω = ±90ppm/ºC
1Ω to 10Ω = ±50ppmºC
>10Ω = ±20ppm/ºC
Performance Characteristics
Test
Moisture Resistance
Load Life
Temperature Cycling
Short Time Overload
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
Result
1% max
1%
0.5%
1%
Operating Temperature Range: -55ºC to +350ºC
Rev Date: 08/20/2012
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
WW/MWW/NWW Series
General Purpose and Precision Wirewound Resistor
Power Derating Curve:
Percent Rated Power (%)
Stackpole Electronics, Inc.
Resistive Product Solutions
120
100
80
60
40
20
25
75
125
175
225
275
325
350
Ambient Temperature (ºC)
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
WW5, WWS7 / NWW5, NWWS7
WW7 / NWW7
WW7B, WWS10 / NWW7B, NWWS10
WW10 / NWW10
MWW1 / NMWW1
MWW3 / NMWW3
MWW5 / NMWW5
MWW10 / NMWW10
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
0.875
22.23
1.000
25.40
1.200
30.48
1.780
45.21
0.385
9.78
0.560
14.22
0.925
23.50
1.965
49.91
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
0.062
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
0.312
7.92
0.312
7.92
0.312
7.92
0.375
9.53
0.135
3.43
0.205
5.21
0.330
8.38
0.480
12.19
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
0.031
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
0.036
0.91
0.036
0.91
0.036
0.91
0.040
1.02
0.032
0.81
0.032
0.81
0.036
0.91
0.040
1.02
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
0.002
0.05
0.002
0.05
0.002
0.05
0.002 (2)
0.05 (2)
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.
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
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product
(2) Available in 0.036" / 0.91mm
Rev Date: 08/20/2012
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
WW/MWW/NWW Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
How to Order
1
2
3
4
5
6
7
8
9
W
Product Series
Standard
WW
Mini
WWS
Molded
MWW
NWW Non-Inductive
Mini
NWWS
Non-Inductive
W
1
F
T
Tolerance
Code Tol
B
0.1%
D
0.5%
F
1%
J
5%
1
K
0
0
Resistance Value
Four characters
with the multiplier
used as the
decimal holder.
0.1 ohm = R100
2 Kohm = 2K00
Type/Code
WW12 / NWW12
WW1 / NWW1
WW1A / NWW1A
WW2 / NWW2
WWS2 / NWWS2
WW2A / NWW2A
WW3 / NWW3
WWS3 / NWWS3
WW3A / NWW3A
WW4 / NWW4
WWS4 / NWWS4
WW5 / NWW5
WWS5 / NWWS5
WW7 / NWW7
WWS7 / NWWS7
WW7B / NWW7B
WW10 / NWW10
WWS10 / NWWS10
MWW1 / NMWW1
MWW3 / NMWW3
MWW5 / NMWW5
MWW10 / 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
Code
Description
T
11" Tape
and Reel
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
WWS7 / NWWS7
500
WW7 / NWW7
WW7B / NWW7B
WWS10 / NWWS10
MWW5 / NMWW5
WW10 / NWW10
250
MWW10 / NMWW10
Legacy Part Number (before January 3, 2011):
SEI Type
Code
Nominal
Resistance
Tolerance
Packaging
WW
Type
WW
WWS
MWW
NWW
NWWS
Description
Standard
Mini
Molded
Non-Inductive
Mini
Non-Inductive
1
10K
1%
Tolerance
0.1%
0.5%
1%
5%
R
Types
WW12, NWW12, WW1, NWW1, WWS2, NWWS2
WW1A, NWW1A, MWW1, NMWW1
WW2, NWW2, WWS3, NWWS3, WW2A, NWW2A
WW3, NWW3, WWS4, NWWS4, MWW3, NMWW3
WW3A, NWW3A, WW4, NWW4, WWS5, NWWS5
WW5, NWW5, WWS7, NWWS7, WW7, NWW7
WW7B, NWW7B, WWS10, NWWS10
MWW5, NMWW5
WW10, NWW10, MWW10, NMWW10
Qty
2,500
2,000
11" reel
tape
500
250
R
Description
Code
Rev Date: 08/20/2012
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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