WK73S wide terminal type flat chip resistors EU features • Wide-side termination (reverse-geometry) type flat chip resistor c su • High reliability and performance with T.C.R. er nsre ±100 x 10-6/K, resistance tolerance ±0.5% en t • Products with lead-free terminations meet EU RoHS requirements. EU RoHS regulation is not intended for Pb-glass contained in electrode, resistor element and glass. • AEC-Q200 Qualified dimensions and construction Type Dimensions inches (mm) L c c (Inch Size Code) L W c d t W 2A .049±.006 .079±.006 .012±.008 .014±.008 .022±.004 W NE (0508) (1.25±0.15) (2.0±0.15) (0.3±0.2) (0.35±0.2) (0.55±0.1) 2B .063±.006 .126±.008 .012±.008 .018±.006 (0612) (1.6±0.15) (3.2±0.2) (0.3±0.2) (0.45±0.15) Solder Plating 2H .098±.006 .197±.006 .016±.008 t NPliating (1020) (2.5±0.15) (5.0±0.15) (0.4±0.2) .024±.004 Inner Resistive Electrode 2J .122±.006 .181±.006 .016±.008 .030±.006 (0.6±0.1) d Film (1218) (3.1±0.15) (4.6±0.15) (0.4±0.2) (0.75±0.15) Protective Coating Ceramic 3A .122±.006 .252±.006 .018±.008 Substrate (1225) (3.1±0.15) (6.3±0.15) (0.45±0.2) Derating Curve WK73S2B (1W), WK73S3A (2W) 100 100 100 2J (100°C) 80 80 80 wer wer wer 2H2, 3A3 (95°C) Rated Po4600 Rated Po4600 2A, 2B, 2H, 3A (125°C) Rated Po4600 2B, 3A (115°C) % % % 20 20 20 0 0 0 -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120140 160 -55 70 155 -55 125 155 -55 95 115 155 Ambient Temperature TerminalPart Temperature TerminalPart Temperature (°C) (°C) (°C) For resistors operated at an ambient temperature For resistors operated terminal temperature of described for each size or above, a power rating of 70°C or above, a power rating shall be derated shall be derated in accordance with the derating curve above. in accordance with the above derating curve. Please refer to “Introduction of the derating curve based on the terminal part temperature” in the beginning of our catalog before use. If you want to use at rated power (*1), use derating curves based on the terminal part temperature ordering information on the right side graph. WK73S 2J T TE 33L0 F Termination Nominal Resistance Type Size Packaging Material Resistance Tolerance WK73S New2A: 1W T: Sn TD: 0508, 0612: 7" 4mm pitch ±1%: 3 significant figures + 1 D: ±0.5% 2B: 0.75W, 1W punched paper multiplier “R” indicates decimal F: ±1% TE: 1020, 1218, 1225: on value <100Ω 2H: 1W J: ±5% 7" embossed plastic ±5%: 2 significant figures + 1 2J: 1W For further information on multiplier “R” indicates decimal 3A: 1.5W, 2W packaging, please refer to on values <10Ω Appendix A All values less than 0.1Ω (100mΩ) are expressed in mΩ with “L” as decimal. Ex: 33mΩ, 1% = 33L0 Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/11/19 118 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com

WK73S wide terminal type flat chip resistors applications and ratings Rated Rated Resistance Range (Ω) Maximum Maximum Operating Part Power T.C.R. Ambient Terminal Part Working Overload Temp. Designation Rating (X 10-6/K) D±0.5% F±1% J±5% Temp. Temp. Voltage Voltage Range E-24/E-96 E-24/E-96 E-24 W ±100 — 1 - 9.76 1 - 9.1 EN WK73S2A 1.0W1 –– 125°C 0~+200 — 30m - 976m 30m - 910m 200V 400V nte 0~+300 — 20m - 29.4m 20m - 27m es ±800 — — 10m - 27m rren 0.75W 70°C 125°C ±200 — 30m - 422m 30m - 390m us ±100 430m - 9.76 430m - 9.76 430m - 9.1 c WK73S2B 200V 400V ±800 — — 10m - 27m 1.0W1 –– 115°C ±200 — 30m - 422m 30m - 390m ±100 430m - 9.76 430m - 9.76 430m - 9.1 ±800 — — 10m - 24m -55°C WK73S2H 1.0W 70°C 125°C ±200 — 27m - 215m 27m - 200m 200V 400V to ±100 — 220m - 9.76 220m - 9.1 +155°C ±800 — — 10m - 30m WK73S2J 1.0W 70°C 100°C ±200 — 33m - 237m 33m - 220m 200V 400V ±100 — 240m - 9.76 240m - 9.1 ±800 — — 10m - 20m ±300 — 22m - 32.4m 22m - 30m 1.5W 70°C 125°C ±200 — 33m - 357m 33m - 330m ±100 — 360m - 9.76 360m - 9.1 WK73S3A 200V 400V ±800 — — 10m - 20m ±300 — 22m - 32.4m 22m - 30m 2.0W1 –– 115°C ±200 — 33m - 357m 33m - 330m ±100 — 360m - 9.76 360m - 9.1 Rated voltage = √Power rating x resistance value or max. working voltage, whichever is lower 1 If you want to use at rated power use derating curves based on the terminal part temperature on the right side graph located on previous page. If any questions arise whether to use the “Rated Ambient Temperature” or the “Rated Terminal Part Temperature”, please give priority to the “Rated Terminal Part Temperature.” For more details refer to the “Introduction of the derating curves based on the terminal part temperature” in the beginning of the catalog Temperature Rise One-Pulse Limiting Electric Power WK73S 2A-2B 1J WK73S 2H-3A WK73S 2A-3A W) 1000 140 2A 140 3A wer ( Temperature Rise (°C) 11864202000000 222BAB Temperature Rise (°C) 11864202000000 232HHA//22JJ Pulse Limiting Electric Po 11000 3222AHBA/2J 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 One- 1.001 .01 .1 1 10 100 1000 Power Rating Power Rating Pulse Duration (%) (%) (ms) Regarding the temperature rise, the value of the temperature Measurement condition The maximum applicable voltage is equal to the max. varies per conditions and board for use since the temperature Room temperature: 25°C overload voltage. Please contact factory for resistance PCB: FR-4t = 1.6mm is measured under our measuring conditions. Cu foil thickness: 35µm characteristics of continuous applied pulse. ①:Hot spot environmental applications ②:Terminal Performance Characteristics Requirement ∆ R ±(%+0.005Ω) Parameter Limit Typical Test Method Within specified Resistance — 25°C tolerance T.C.R. Within specified T.C.R. — +25°C/-55°C and +25°C/+125°C WK73S2A (1W), WK73S2B (1W), WK73S3A (2W): Rated voltage x2.0 for Overload (Short time) ±2% ±0.2% 5 seconds. WK7S2B, S2H, S2J, S3A: Rated voltage x2.5 for 3 seconds Resistance to Solder Heat ±1% ±0.2% 260°C ± 5°C, 10 seconds ± 1 second Bending Test ±1% ±0.1% Holding point 90mm, Bending 1 time, Bending 5mm Rapid Change of Temperature ±0.5% ±0.3% -55°C (30 minutes), +155°C (30 minutes), 5 cycles Moisture Resistance ±2% ±0.2% 40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle Endurance at 70°C ±2% ±0.2% 70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle ±2%: WK73S (±5%) ±0.5%: WK73S (±5%) High Temperature Exposure +155°C, 1000 hours ±1%: all others ±0.2%: all others Additional environmental applications can also be found at www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 11/25/19 119 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: K OA Speer: WK73S2JTTER560F WK73S2JTTER390F WK73S3ATTER150F WK73S2BTTD10LJ WK73S2BTTD11LJ WK73S2BTTD12LJ WK73S2BTTD13LJ WK73S2BTTD15LJ WK73S2BTTD16LJ WK73S2BTTD18LJ WK73S2BTTD1R00F WK73S2BTTD1R0J WK73S2BTTD1R10F WK73S2BTTD1R1J WK73S2BTTD1R20F WK73S2BTTD1R2J WK73S2BTTD1R30F WK73S2BTTD1R3J WK73S2BTTD1R50F WK73S2BTTD1R5J WK73S2BTTD1R60F WK73S2BTTD1R6J WK73S2BTTD1R80F WK73S2BTTD1R8J WK73S2BTTD20LJ WK73S2BTTD22LJ WK73S2BTTD24LJ WK73S2BTTD27LJ WK73S2BTTD2R00F WK73S2BTTD2R0J WK73S2BTTD2R20F WK73S2BTTD2R2J WK73S2BTTD2R40F WK73S2BTTD2R4J WK73S2BTTD2R70F WK73S2BTTD2R7J WK73S2BTTD30L0F WK73S2BTTD30LJ WK73S2BTTD33L0F WK73S2BTTD33LJ WK73S2BTTD36L0F WK73S2BTTD36LJ WK73S2BTTD39L0F WK73S2BTTD39LJ WK73S2BTTD3R00F WK73S2BTTD3R0J WK73S2BTTD3R30F WK73S2BTTD3R3J WK73S2BTTD3R60F WK73S2BTTD3R6J WK73S2BTTD3R90F WK73S2BTTD3R9J WK73S2BTTD43L0F WK73S2BTTD43LJ WK73S2BTTD47L0F WK73S2BTTD47LJ WK73S2BTTD4R30F WK73S2BTTD4R3J WK73S2BTTD4R70F WK73S2BTTD4R7J WK73S2BTTD51L0F WK73S2BTTD51LJ WK73S2BTTD56L0F WK73S2BTTD56LJ WK73S2BTTD5R10F WK73S2BTTD5R1J WK73S2BTTD5R60F WK73S2BTTD5R6J WK73S2BTTD62L0F WK73S2BTTD62LJ WK73S2BTTD68L0F WK73S2BTTD68LJ WK73S2BTTD6R20F WK73S2BTTD6R2J WK73S2BTTD6R80F WK73S2BTTD6R8J WK73S2BTTD75L0F WK73S2BTTD75LJ WK73S2BTTD7R50F WK73S2BTTD7R5J WK73S2BTTD82L0F WK73S2BTTD82LJ WK73S2BTTD8R20F WK73S2BTTD8R2J WK73S2BTTD91L0F WK73S2BTTD91LJ WK73S2BTTD9R10F WK73S2BTTD9R1J WK73S2BTTDR100F WK73S2BTTDR10J WK73S2BTTDR110F WK73S2BTTDR11J WK73S2BTTDR120F WK73S2BTTDR12J WK73S2BTTDR130F WK73S2BTTDR13J WK73S2BTTDR150F WK73S2BTTDR15J WK73S2BTTDR160F WK73S2BTTDR16J