resistors WK73-RT wide terminal type flat chip resistors (anti sulfuration) EU features • Anti-sulfuration type, wide-side termination (reverse-geometry)type flat chip resistor • Excellent anti-sulfuration characteristic due to using high sulfuration-proof inner top electrode material • Suitable for both flow and reflow solderings • Marking: Black coating color • This products 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 L c Type c L 2B (0612) +.004 .063± -.008 +0.1 (1.6± -0.2 ) +.004 .126± -.012 +0.1 (3.2± -0.3 ) +.004 +.004 +.004 +.004 W Ceramic Substrate Sn Plating t NEW Protective Resistive Inner Electrode Coating Film 2J (1218) .122± -.008 .181± -.008 .016±.008 .030±.006 +0.1 +0.1 (0.4±0.2) (0.75±0.15) (3.1± -0.2 ) (4.6± -0.2 ) .024±.004 +.008 (0.6±0.1) .122± -.004 .248±.006 .018±.008 .030±.006 +0.2) (6.3±0.15) (0.45±0.2) (0.75±0.15) (3.1± -0.1 3A (1225) 60 40 100 3A (90°C) 2H, 2J (100°C) 2B (105°C) 60 40 20 20 80 100 120 140 160 155 70 Ambient Temperature (°C) 40 60 For resistors operated at an ambient temperature of 70°C or above, a power rating shall be derated in accordance with the above derating curve. 3A (90°C) 80 % Rated Power 80 % Rated Power 80 % Rated Power 100 20 .024±.004 (0.6±0.1) WK73S2B (1W), WK73S/R3A (2W) 100 0 .012±.008 .018±.006 (0.3±0.2) (0.45±0.15) .098± -.008 .197± -.008 .016±.008 .030±.006 +0.1 +0.1 (0.4±0.2) (0.75±0.15) (2.5± -0.2 ) (5.0± -0.2 ) Derating Curve 0 -60 -40 -20 -55 t 2H (1020) Ni Plating d Dimensions inches (mm) W c d (Inch Size Code) 2B (105°C) 60 40 20 0 -60 -40 -20 -55 80 100 120 140 160 90 105 155 Terminal Part Temperature (°C) 0 20 40 60 0 -60 -40 -20 -55 20 40 60 80 100 120 140 160 90 105 155 Terminal Part Temperature (°C) 0 For resistors operated terminal temperature of described for each size or above, a power rating shall be derated in accordance with the derating curve. Please refer to “Introduction of the derating curve based on the terminal part temperature” on the beginning of our catalog before use. ordering information New Part # WK73R R2B Type Size WK73S WK73R R2B: 0.75W S2B: 1W 2H: 1W NEW 2J: 1W NEW 3A: 2W * Resistance value, 3 digits: 1~9.1Ω, 1R0~9R1 Resistance value, 4 digits: 1~9.76Ω, 1R00~9R76 RT Termination Material RT : Sn TD Packaging TD: 4mm pitch punched paper TE: 4mm pitch embossed plastic For further information on packaging, please refer to Appendix A 10R0 F Nominal Resistance* ±1%: 4 digits ±5%: 3 digits Resistance Tolerance F: ±1% J: ±5% Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 26 8/17/15 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com wide terminal type flat chip resistors (anti sulfuration) applications and ratings Part Designation Power Rating Rated Ambient Temperature WK73S2B 0.75W 1.0W 70°C –– Rated Terminal Part Temperature 105°C 105°C WK73R2B 0.75W 70°C 105°C WK73S2H 1.0W 70°C 100°C WK73R2H 1.0W 70°C 100°C WK73S2J 1.0W 70°C 100°C WK73R2J 1.0W 70°C 100°C WK73S3A 1.5W 2.0W 70°C –– 90°C 90°C 1.5W 70°C 90°C 2.0W –– 90°C T.C.R. (X 10-6/K) ±100 ±100 ±100 ±200 ±100 ±100 ±200 ±100 ±100 ±200 ±100 ±100 ±100 ±200 ±100 ±200 WK73R3A Resistance Range (Ω) F±1% E-24 • E-96 1 ~ 9.76 1 ~ 9.76 10 ~ 9.76k 10k ~ 1M 1 ~ 9.76 10 ~ 430k 432k - 1M 1 ~ 9.76 10 ~ 510k 511k ~ 1M 1 ~ 9.76 1 ~ 9.76 10 ~ 330k 332k - 1M 10 ~ 330k 332k - 1M J±5% E-24 1~9.1 1~9.1 10 ~ 9.1k 10k ~ 1M 1 ~ 9.1 10 ~ 430k 470k - 1M 1~9.1 10 ~ 510k 560k ~ 1M 1 ~ 9.1 1 ~ 9.1 10 ~ 330k 360k - 1M 10 ~ 330k 360k - 1M Maximum Working Voltage Maximum Overload Voltage 200V 400V 200V 400V 200V 400V 200V 400V Operating Temperature Range -55°C to +155°C Rated voltage = √Power rating x resistance value or max. working voltage, whichever is lower environmental applications Performance Characteristics Parameter Resistance T.C.R. Overload (Short time) Resistance to Solder Heat Bending Test Rapid Change of Temperature Moisture Resistance Endurance at 70°C High Temperature Exposure Sulfuration Test Requirement ∆ R ±(%+0.005Ω) Limit Typical Within specified — tolerance Within specified — T.C.R. ±2% ±0.2% ±1% ±1% ±0.5% ±2% ±2% ±0.2% ±0.1% ±0.1% ±0.2% ±0.2% ±1%: another ±0.2%: another ±5% — Test Method 25°C +25°C/-55°C and +25°C/+125°C WK73S2B, S3A, R3A: Rated Voltage x 2 for 5 seconds WK73R2B, S2H, R2H, S2J, R2J: Rated Voltage x 2.5 for 5 seconds 260°C ± 5°C, 10 seconds ± 1 second Holding point 90mm, Bending 1 time, Bending 5mm -55°C (30 minutes), +155°C (30 minutes), 5 cycles 40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle 70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle +155°C, 1000 hours Soaked in industrial oil with 3.5% sulfur concentration 105°C ± 3°C, 500 hours 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. 9/03/15 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com 27 resistors WK73-RT