Rev Date: 08/20/2012 1 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
WW/MWW/NWW 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 – 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
Test Test Condition Result
Moisture Resistance 1000 hours, 95% R.H., 40ºC 1% max
Load Life 1000 hours,
cycled power 1.5 hours ON, 0.5 hours OFF, 25ºC 1%
Temperature Cycling 5 cycles, -55ºC to 200ºC 0.5%
Short Time Overload 5 times rated power for 5 seconds 1%
Operating Temperature Range: -55ºC to +350ºC
WW12 / NWW12 - 500V 0.4W 0.5 W 0.1 - 2K 0.1 - 1K
WW1 / NWW1 - 500V 1W 1.1 W 0.1 - 3K 0.1 - 1.5K
WW1A / NWW1A RW-70 500V 1W 1.3 W 0.1 - 7K 0.1 - 3.5K
WW2 / NWW2 RW-69 1,000V 1.5W 2.1 W 0.1 - 10K 0.1 - 5K
WWS2 / NWWS2 - 500V 2.5W 2.6 W 0.1 - 3K 0.1 - 1.5K
WW2A / NWW2A - 1,000V 2.5W 2.6 W 0.1 - 15K 0.1 - 7.5K
WW3 / NWW3 RW-79 1,000V 3W 3.2 W 0.1 - 22K 0.1 - 11K
WWS3 / NWWS3 - 1,000V 3W 3.2 W 0.1 - 10K 0.1 - 5K
WW3A / NWW3A - 1,000V 3W 3.4 W 0.1 - 30K 0.1 - 15K
WW4 / NWW4 - 1,000V 4W 4.3 W 0.1 - 40K 0.1 - 20K
WWS4 / NWWS4 RW-79 1,000V 4W 4.3 W 0.1 - 22K 0.1 - 11K
WW5 / NWW5 RW-67, RW-74 1,000V 5W 5.1 W 0.1 - 50K 0.1 - 25K
WWS5 / NWWS5 - 1,000V 5W 5.1 W 0.1 - 40K 0.1 - 20K
WW7 / NWW7 - 1,000V 6.5W 7.2 W 0.1 - 70K 0.1 - 35K
WWS7 / NWWS7 RW-67, RW-74 1,000V 6.5W 7.2 W 0.1 - 50K 0.1 - 25K
WW7B / NWW7B - 1,000V 7W 7.7 W 0.1 - 100K 0.1 - 50K
WW10 / NWW10 RW-78 1,000V 10W 11.0 W 0.1 - 150K 0.1 - 75K
WWS10 / NWWS10 - 1,000V 10W 11.0 W 0.1 - 100K 0.1 - 50K
MWW1 / NMWW1 RW-70 1,000V 1W 1.3 W 0.1 - 2K
MWW3 / NMWW3 RW-79 1,000V 3W 3.2 W 0.1 - 20K
MWW5 / NMWW5 RW-67, RW-74 1,000V 5W 5.5 W 0.1 - 40K
MWW10 / NMWW10 RW-68, RW-74 1,000V 10W 11.0 W 0.1 - 150K
(1) Lesser of √PR or maximum working voltage
Dielectric
Strength (V)
(1)
Type / Code
< 1Ω = ±90ppm/ºC
MIL-R-26 Ref.
Power Rating
(Watts)
@ 125ºC
TCR (ppm/ºC)
Ohmic Range(Ω) and Tolerance
Power Rating
(Watts)
@ 70ºC
0.1%, 0.5%, 1% & 5%
Standard Non-Inductive
->10Ω = ±20ppm/ºC
1Ω to 10Ω = ±50ppmºC
-
-
-
Electrical Specifications
Performance Characteristics
Rev Date: 08/20/2012 2 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
WW/MWW/NWW Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Power Derating Curve:
350
Ambient Temperature (ºC)
25 325175 225 27575 125
20
80
60
40
100
120
Percent Rated Power (%)
0.312 ± 0.062 0.110 ± 0.031 0.025 ± 0.002 1.500 typ. inches
7.92 ± 1.57 2.79 ± 0.79 0.64 ± 0.05 38.10 typ. mm
0.375 ± 0.062 0.110 ± 0.031 0.025 ± 0.002 1.500 typ. inches
9.53 ± 1.57 2.79 ± 0.79 0.64 ± 0.05 38.10 typ. mm
0.420 ± 0.062 0.110 ± 0.031 0.025 ± 0.002 1.500 typ. inches
10.67 ± 1.57 2.79 ± 0.79 0.64 ± 0.05 38.10 typ. mm
0.370 ± 0.062 0.156 ± 0.031 0.032 ± 0.002 1.500 typ. inches
9.40 ± 1.57 3.96 ± 0.79 0.81 ± 0.05 38.10 typ. mm
0.550 ± 0.062 0.156 ± 0.031 0.032 ± 0.002 1.500 typ. inches
13.97 ± 1.57 3.96 ± 0.79 0.81 ± 0.05 38.10 typ. mm
0.560 ± 0.062 0.187 ± 0.031 0.032 ± 0.002 1.500 typ. inches
14.22 ± 1.57 4.75 ± 0.79 0.81 ± 0.05 38.10 typ. mm
0.500 ± 0.062 0.218 ± 0.031 0.032 ± 0.002 1.500 typ. inches
12.70 ± 1.57 5.54 ± 0.79 0.81 ± 0.05 38.10 typ. mm
0.700 ± 0.062 0.270 ± 0.031 0.036 ± 0.002 1.500 typ. inches
17.78 ± 1.57 6.86 ± 0.79 0.91 ± 0.05 38.10 typ. mm
0.875 ± 0.062 0.312 ± 0.031 0.036 ± 0.002 1.500 typ. inches
22.23 ± 1.57 7.92 ± 0.79 0.91 ± 0.05 38.10 typ. mm
1.000 ± 0.062 0.312 ± 0.031 0.036 ± 0.002 1.500 typ. inches
25.40 ± 1.57 7.92 ± 0.79 0.91 ± 0.05 38.10 typ. mm
1.200 ± 0.062 0.312 ± 0.031 0.036 ± 0.002 1.500 typ. inches
30.48 ± 1.57 7.92 ± 0.79 0.91 ± 0.05 38.10 typ. mm
1.780 ± 0.062 0.375 ± 0.031 0.040 ± 0.002 (2) 1.500 typ. inches
45.21 ± 1.57 9.53 ± 0.79 1.02 ± 0.05 (2) 38.10 typ. mm
0.385 ± 0.062 0.135 ± 0.031 0.032 ± 0.002 1.500 typ. inches
9.78 ± 1.57 3.43 ± 0.79 0.81 ± 0.05 38.10 typ. mm
0.560 ± 0.062 0.205 ± 0.031 0.032 ± 0.002 1.500 typ. inches
14.22 ± 1.57 5.21 ± 0.79 0.81 ± 0.05 38.10 typ. mm
0.925 ± 0.062 0.330 ± 0.031 0.036 ± 0.002 1.500 typ. inches
23.50 ± 1.57 8.38 ± 0.79 0.91 ± 0.05 38.10 typ. mm
1.965 ± 0.062 0.480 ± 0.031 0.040 ± 0.002 1.500 typ. inches
49.91 ± 1.57 12.19 ± 0.79 1.02 ± 0.05 38.10 typ. mm
(1) See "Resistor Packaging Specification Document" for lead length dimension for tape and reel packaged product
(2) Available in 0.036" / 0.91mm
NMWW1
NMWW3
NMWW5
NMWW10
NWW5, NWWS7
NWW7
NWW7B, NWWS10
NWW10
NWW2A
NWW3, NWWS4
NWW3A
NWW4, NWWS5
NWW12
NWW1, NWWS2
NWW1A
NWW2, NWWS3
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
WW12
WW3, WWS4
WW3A
WW4, WWS5
WW1, WWS2
WW1A
WW2, WWS3
WW2A
MWW10
WW5, WWS7
WW7
WW7B, WWS10
WW10
MWW1
MWW3
MWW5
AB CType / Code D
(Bulk) (1) Unit
Mechanical Specifications
Rev Date: 08/20/2012 3 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
WW/MWW/NWW Series
General Purpose and Precision Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
How to Order
123456789
WW 1 F T 1 K 0 0
WW Quantity
WWS 0.5 W
MWW 1.1 W
NWW 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
J
Code
B
D
F
MWW10 / NMWW10
WW10 / NWW10
WWS10 / NWWS10
MWW1 / NMWW1
MWW3 / NMWW3
WW5 / NWW5
WWS5 / NWWS5
WW7B / NWW7B
MWW5 / NMWW5
WW7 / NWW7
WWS7 / NWWS7
WW3A / NWW3A
WW4 / NWW4
WWS4 / NWWS4
WW3 / NWW3
WWS3 / NWWS3
Mini
Non-Inductive
Non-Inductive
NWWS 0.1 ohm = R100
2 Kohm = 2K00
Four characters
with the multiplier
used as the
decimal holder.
0.5%
1%
Tol
0.1%
T
2,500
WW12 / NWW12WW12 / NWW12
WW1 / NWW1
WW2 / NWW2
WWS2 / NWWS2
WW1A / NWW1A
Type/Code
Standard
5%
MWW10 / NMWW10
WW10 / NWW10
WW2 / NWW2
WWS3 / NWWS3
WW2A / NWW2A
WW3 / NWW3
Product Series
Description Size
Resistance ValueTolerance
Code
Packaging
Mini
Molded
10W
1W
3W
5W
10W
WWS4 / NWWS4
WW2A / NWW2A
10W
WW3A / NWW3A
WW4 / NWW4
WWS5 / NWWS5
WW5 / NWW5
WWS7 / NWWS7
WW7 / NWW7
6.5W
2.5W
WWS10 / NWWS10
11" Tape
and Reel
MWW3 / NMWW3
WW1 / NWW1
WWS2 / NWWS2
WW1A / NWW1A
MWW1 / NMWW1
6.5W
7W 500
250
2.5W
4W
4W
5W
5W
WW7B / NWW7B
MWW5 / NMWW5
3W
Power Rating
@ 70ºC
2,000
3W
3W
@ 125ºC
0.4W
1W
1W
1.5W
Legacy Part Number (before January 3, 2011):
Nominal
Code Resistance Tolerance
1 10K 1%
Type Description Tolerance Types Qty Description Code
WW Standard 0.1% WW12, NWW12, WW1, NWW1, WWS2, NWWS2
WWS Mini 0.5% WW1A, NWW1A, MWW1, NMWW1
MWW Molded 1% WW2, NWW2, WWS3, NWWS3, WW2A, NWW2A
NWW Non-Inductive 5% 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 250
500
11" reel
tape R
Mini
Non-Inductive
NWWS
SEI Type Packaging
WW R
2,500
2,000