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 • RoHS compliant and halogen-free Electrical Specifications – WW, WWS, MWW Power Rating (Watts) Ohmic Range (Ω) and Tolerance (*) Type / Code MIL-R-26 Ref. TCR (ppm/ºC) @ 125 °C @ 70 °C 0.1% 0.5% 1% 5% WW12 - 0.4 0.5 5 - 2 K 3 - 2 K 5 - 2 K WW1 - 1 1.1 2 - 3 K WW1A RW-70 1 1.3 1 - 5 K WW2 RW-69 1.5 2.1 1 - 10 K 0.5 - 10 K WWS2 - 2.5 2.6 1 - 10 K 0.5 - 10 K WW2A - 2.5 2.6 1 - 10 K 0.5 - 10 K WW3 RW-79 3 3.2 1 - 22 K 0.5 - 22 K WWS3 - 3 3.2 3 - 10 K 1 - 10 K WW3A - 3 3.4 1 - 30 K 0.5 - 30 K WW4 - 4 4.3 1 - 40 K 0.5 - 40 K WWS4 RW-79 4 4.3 < 1 Ω = ± 90 ppm/ºC 1 - 2 2 K 0.5 - 22 K 1 Ω to 10 Ω = ± 50 ppm/ºC WW5 RW-67, RW-74 5 5.1 1 - 50 K 0.5 - 50 K > 10 Ω = ± 20 ppm/ºC WWS5 - 5 5.1 1 - 40 K 0.5 - 40 K WW7 - 6.5 7.2 1 - 70 K 0.5 - 70 K WWS7 RW-67, RW-74 6.5 7.2 1 - 50 K 0.5 - 50 K WW7B - 7 7.7 1 - 70 K 0.5 - 70 K WW10 RW-78 10 11 1 - 100 K 0.5 - 100 K WWS10 - 10 11 1 - 70 K 0.5 - 70 K MWW1 RW-70 1 1.3 5 - 2 K MWW3 RW-79 3 3.2 3 - 20 K MWW5 RW-67, RW-74 5 5.5 2 - 40 K MWW10 RW-68, RW-74 10 11 2 - 80 K (*) Other resistance values available - contact factory for details. Electrical Specifications – Non-Inductive Styles Power Rating (Watts) Ohmic Range (Ω) and Tolerance (*) Type / Code MIL-R-26 Ref. TCR (ppm/ºC) @ 125 °C @ 70 °C 1% and 5% NWW12 - 0.4 0.5 10 - 1 K NWW1 - 1 1.1 2 - 1.5 K NWW1A RW-70 1 1.3 1 - 2.5 K NWW2 RW-69 1.5 2.1 1 - 5 K NWWS2 - 2.5 2.6 1 - 5 K NWW2A - 2.5 2.6 < 1 Ω = ± 90 ppm/ºC 1 - 5 K NWW3 RW-79 3 3.2 1 Ω to 10 Ω = ± 50 ppm/ºC 1 - 11 K NWWS3 - 3 3.2 > 10 Ω = ± 20 ppm/ºC 3 - 5 K NWW3A - 3 3.4 1 - 15 K NWW4 - 4 4.3 1 - 20 K NWWS4 RW-79 4 4.3 1 - 11 K NWW5 RW-67, RW-74 5 5.1 1 - 25 K NWWS5 - 5 5.1 1 - 20 K (*) Other resistance values available - contact factory for details. Rev Date: 09/30/2019 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 / WWS Series Stackpole Electronics, Inc. General Purpose and Precision Wirewound Resistor Resistive Product Solutions Electrical Specifications – Non-Inductive Styles (cont.) Power Rating (Watts) Ohmic Range (Ω) and Tolerance (*) Type / Code MIL-R-26 Ref. TCR (ppm/ºC) @ 125 °C @ 70 °C 1% and 5% NWW7 - 6.5 7.2 1 - 35 K NWWS7 RW-67, RW-74 6.5 7.2 1 - 25 K NWW7B - 7 7.7 1 - 35 K NWW10 RW-78 10 11 < 1 Ω = ± 90 ppm/ºC 1 - 5 0 K NWWS10 - 10 11 1 Ω to 10 Ω = ± 50 ppm/ºC 1 - 35 K NMWW1 RW-70 1 1.3 > 10 Ω = ± 20 ppm/ºC 5 - 1 K NMWW3 RW-79 3 3.2 3 - 10 K NMWW5 RW-67, RW-74 5 5.5 2 - 20 K NMWW10 RW-68, RW-74 10 11 2 - 40 K (*) Other resistance values available - contact factory for details. Mechanical Specifications D Type / Code A B C Unit (Bulk) (1) 0.312 ± 0.062 0.110 ± 0.031 0.025 ± 0.002 1.500typ. inches WW12 / NWW12 7.92 ± 1.57 2.79 ± 0.79 0.64 ± 0.05 38.10typ. mm 0.375 ± 0.062 0.110 ± 0.031 0.025 ± 0.002 1.500typ. inches WW1, WWS2 / NWW1, NWWS2 9.53 ± 1.57 2.79 ± 0.79 0.64 ± 0.05 38.10typ. mm 0.420 ± 0.062 0.110 ± 0.031 0.025 ± 0.002 1.500typ. inches WW1A / NWW1A 10.67 ± 1.57 2.79 ± 0.79 0.64 ± 0.05 38.10typ. mm 0.370 ± 0.062 0.156 ± 0.031 0.032 ± 0.002 1.500typ. inches WW2, WWS3 / NWW2, NWWS3 9.40 ± 1.57 3.96 ± 0.79 0.81 ± 0.05 38.10typ. mm WW2A / NWW2A 0.550 ± 0.062 0.156 ± 0.031 0.032 ± 0.002 1.500typ. inches 13.97 ± 1.57 3.96 ± 0.79 0.81 ± 0.05 38.10typ. mm 0.560 ± 0.062 0.187 ± 0.031 0.032 ± 0.002 1.500typ. inches WW3, WWS4 / NWW3, NWWS4 14.22 ± 1.57 4.75 ± 0.79 0.81 ± 0.05 38.10typ. mm 0.500 ± 0.062 0.218 ± 0.031 0.032 ± 0.002 1.500typ. inches WW3A / NWW3A 12.70 ± 1.57 5.54 ± 0.79 0.81 ± 0.05 38.10typ. mm 0.700 ± 0.062 0.270 ± 0.031 0.036 ± 0.002 1.500typ. inches WW4, WWS5 / NWW4, NWWS5 17.78 ± 1.57 6.86 ± 0.79 0.91 ± 0.05 38.10typ. mm 0.875 ± 0.062 0.312 ± 0.031 0.036 ± 0.002 1.500typ. inches WW5, WWS7 / NWW5, NWWS7 22.23 ± 1.57 7.92 ± 0.79 0.91 ± 0.05 38.10typ. mm 1.000 ± 0.062 0.312 ± 0.031 0.036 ± 0.002 1.500typ. inches WW7 / NWW7 25.40 ± 1.57 7.92 ± 0.79 0.91 ± 0.05 38.10typ. mm 1.200 ± 0.062 0.312 ± 0.031 0.036 ± 0.002 1.500typ. inches WW7B, WWS10 / NWW7B, NWWS10 30.48 ± 1.57 7.92 ± 0.79 0.91 ± 0.05 38.10typ. mm 1.780 ± 0.062 0.375 ± 0.031 0.040 ± 0.002 1.500typ. inches WW10 / NWW10 (2) 45.21 ± 1.57 9.53 ± 0.79 1.02 ± 0.05 38.10typ. mm 0.385 ± 0.062 0.135 ± 0.031 0.032 ± 0.002 1.500typ. inches MWW1 / NMWW1 9.78 ± 1.57 3.43 ± 0.79 0.81 ± 0.05 38.10typ. mm 0.560 ± 0.062 0.205 ± 0.031 0.032 ± 0.002 1.500typ. inches MWW3 / NMWW3 14.22 ± 1.57 5.21 ± 0.79 0.81 ± 0.05 38.10typ. mm 0.925 ± 0.062 0.330 ± 0.031 0.036 ± 0.002 1.500typ. inches MWW5 / NMWW5 23.50 ± 1.57 8.38 ± 0.79 0.91 ± 0.05 38.10typ. mm 1.965 ± 0.062 0.480 ± 0.031 0.040 ± 0.002 1.500typ. inches MWW10 / NMWW10 49.91 ± 1.57 12.19 ± 0.79 1.02 ± 0.05 38.10typ. mm (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. Rev Date: 09/30/2019 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 / WWS Series Stackpole Electronics, Inc. General Purpose and Precision Wirewound Resistor Resistive Product Solutions Power Derating Curve: -55 ºC 70 °C 125 °C 100 %) 80 wer ( o P 60 d e at R 40 nt ce er 20 P 350 ºC 0 -60 0 50 100 150 200 250 300 350 400 Ambient Temperature (ºC) Performance Characteristics Test Test Condition Test Specification Moisture Resistance 1000 hours, 95% R.H., 40 ºC 1% max 1000 hours, Load Life 1% cycled power 1.5 hours ON, 0.5 hours OFF, 25 ºC Temperature Cycling 5 cycles, -55 ºC to 200 °C 0.5% Short Time Overload 5 times rated power for 5 seconds 1% Resistor leads are grounded and high potential probe is 500 V for (N)WW12, 1, 1A and 2S. Dielectric Withstand Voltage touched to the resistor body 1000 V for all others Operating Temperature Range: -55 ºC to +350 ºC Lead-Tape Specifications Type / Code A max.(1) B max C D(2) Tape Unit 2.880 11.000 0.197 ± 0.020 2.063 ± 0.079 0.250 inches WW12 73.15 279.40 5.00 ± 0.50 52.40 ± 2.00 6.35 mm WW1, WWS2 2 . 8 8 0 11.000 0.197 ± 0.020 2.063 ± 0.079 0.250 inches NWW1, NWWS2 73.15 279.40 5.00 ± 0.50 52.40 ± 2.00 6.35 mm 2.880 11.000 0.197 ± 0.020 2.063 ± 0.079 0.250 inches WW1A, NWW1A 73.15 279.40 5.00 ± 0.50 52.40 ± 2.00 6.35 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" dimens ion 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: 09/30/2019 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 / WWS Series Stackpole Electronics, Inc. General Purpose and Precision Wirewound Resistor Resistive Product Solutions Lead-Tape Specifications (cont.) Type / Code A max.(1) B max C D(2) Tape Unit WW2, WWS3 2 . 8 8 0 11.000 0.197 ± 0.020 2.063 ± 0.079 0.250 inches NWW2, NWWS3 73.15 279.40 5.00 ± 0.50 52.40 ± 2.00 6.35 mm 2.880 11.000 0.197 ± 0.020 2.063 ± 0.079 0.250 inches WW2A, NWW2A 73.15 279.40 5.00 ± 0.50 52.40 ± 2.00 6.35 mm WW3, WWS4 2 . 8 8 0 11.000 0.197 ± 0.020 2.500 ± 0.079 0.250 inches NWW3, NWWS4 73.15 279.40 5.00 ± 0.50 63.50 ± 2.00 6.35 mm 3.740 11.000 0.394 ± 0.020 2.874 ± 0.079 0.250 inches WW3A, NWW3A 95.00 279.40 10.00 ± 0.50 73.00 ± 2.00 6.35 mm WW4, WWS5 2 . 5 0 0 11.000 0.394 ± 0.020 2.500 ± 0.079 0.250 inches NWW4, NWWS5 63.50 279.40 10.00 ± 0.50 63.50 ± 2.00 6.35 mm WW5, WWS7 3 . 7 4 0 11.000 0.394 ± 0.020 2.874 ± 0.079 0.250 inches NWW5, NWWS7 95.00 279.40 10.00 ± 0.50 73.00 ± 2.00 6.35 mm 5.100 11.000 0.394 ± 0.020 2.874 ± 0.079 0.250 inches WW7, NWW7 129.54 279.40 10.00 ± 0.50 73.00 ± 2.00 6.35 mm WW7B, WWS10 5 . 1 0 0 11.000 0.394 ± 0.020 2.874 ± 0.079 0.250 inches NWW7B, NWWS10 129.54 279.40 10.00 ± 0.50 73.00 ± 2.00 6.35 mm 5.100 11.000 0.394 ± 0.020 2.874 ± 0.079 0.250 inches WW10, NWW10 129.54 279.40 10.00 ± 0.50 73.00 ± 2.00 6.35 mm 3.311 13.504 0.197 ± 0.020 2.063 ± 0.079 0.250 inches MWW1, NMWW1 84.10 343.00 5.00 ± 0.50 52.40 ± 2.00 6.35 mm 3.484 13.504 0.394 ± 0.020 2.063 ± 0.079 0.250 inches MWW3, NMWW3 88.50 343.00 10.00 ± 0.50 52.40 ± 2.00 6.35 mm 3.850 13.504 0.394 ± 0.020 2.874 ± 0.079 0.250 inches MWW5, NMWW5 97.80 343.00 10.00 ± 0.50 73.00 ± 2.00 6.35 mm 4.764 13.504 0.394 ± 0.020 4.310 ± 0.079 0.250 inches MWW10, NMWW10 121.00 343.00 10.00 ± 0.50 109.47 ± 2.00 6.35 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. Rev Date: 09/30/2019 4 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 / WWS Series Stackpole Electronics, Inc. General Purpose and Precision Wirewound Resistor 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 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 Stan dard Lead-Free Standard Package / Lead-Free Series Lead-Free Termination Effective Date Product Description Termination Mfg. Effective Date RoHS Composition Code Series Type (Std Product Series) Compliant (YY/WW) General Purpose and Precision Leaded MWW Axial YES 100% Matte Sn Jan-06 06/01 Wirewound Resistor - Molded General Purpose and Precision Leaded NWW Wirewound Resistor - Conformal Coated - Axial YES 100% Matte Sn Jan-06 06/01 Non-Inductive General Purpose and Precision Leaded WW Wirewound Resistor - Conformal Coated - Axial YES 100% Matte Sn Jan-06 06/01 Non-Inductive Rev Date: 09/30/2019 5 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 / WWS Series Stackpole Electronics, Inc. General Purpose and Precision Wirewound Resistor 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 Type / Code Power Rating Tolerance Packaging Resistance Value Code Description @ 125ºC @ 70ºC Code Tol Code Description Size Quantity WW Standard WW12 / NWW12 0.4 W 0.5 W B 0.1% WW12 / NWW12 Four characters with the multiplier WWS Mini WW1 / NWW1 1 W 1.1 W D 0.5% WW1 / NWW1 used as the MWW Molded WW1A / NWW1A 1 W 1.3 W F 1% WWS2 / NWWS2 2,500 decimal holder. NWW Non-Inductive WW2 / NWW2 1.5 W 2.1 W J 5% WW1A / NWW1A Mini WWS2 / NWWS2 2.5 W 2.6 W MWW1 / NMWW1 0.5 ohm = R500 NWWS Non-Inductive WW2A / NWW2A 2.5 W 2.6 W WW2 / NWW2 1 ohm = 1R00 Non-Inductive WW3 / NWW3 3 W 3.2 W WWS3 / NWWS3 10 Kohm = 10K0 NMWW Molded WWS3 / NWWS3 3 W 3.2 W WW2A / NWW2A 2,000 WW3A / NWW3A 3 W 3.4 W WW3 / NWW3 WW4 / NWW4 4 W 4.3 W WWS4 / NWWS4 WWS4 / NWWS4 4 W 4.3 W 11" Tape M W W 3 / NMWW3 WW5 / NWW5 5 W 5.1 W T and Reel WW3A / NWW3A WWS5 / NWWS5 5 W 5.1 W WW4 / NWW4 WW7 / NWW7 6.5 W 7.2 W WWS5 / NWWS5 WWS7 / NWWS7 6.5 W 7.2 W WW5 / NWW5 WW7B / NWW7B 7 W 7.7 W WWS7 / NWWS7 500 WW10 / NWW10 10 W 11 W WW7 / NWW7 WWS10 / NWWS10 10 W 11 W WW7B / NWW7B MWW1 / NMWW1 1 W 1.3 W WWS10 / NWWS10 MWW3 / NMWW3 3 W 3.2 W MWW5 / NMWW5 MWW5 / NMWW5 5 W 5.5 W WW10 / NWW10 250 MWW10 / NMWW10 10 W 11 W MWW10 / NMWW10 Contact Stackpole for B Bulk package quantities. Rev Date: 09/30/2019 6 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.