flat chip resistors (anti-sulfuration) features Excellent anti-sulfuration characteristic due to using high sulfuration-proof inner top electrode material Excellent heat resistance and weather resistance are ensured by the use of metal glaze thick film High stability and high reliability with the triple-layer structure of electrode Marking: Z1E: Green protective coating ~ W3A: Black protective coating ~ W3A: Blue protective coating 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: 2512 (W3A) dimensions and construction
W Solder Plating t d Protective Coating Resistive Inner Electrode Film Ni Plating Ceramic SubstrateFor resistors operated at an ambient temperature 70�C or above, a power rating shall be derated in accordance with the above derating curve.
New Part # RK73H Type RK73Z 2A Power Rating W3A RT Termination Surface Material RT: Sn Anti-Sulfur TD Packaging
TPL: 0402 only: 2mm pitch punch paper TP: 2mm pitch punch paper TD: 4mm pitch punched paper TDD: paper tape TE: embossed plastic TED: embossed plastic For further information on packaging, please refer to Appendix A
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com
Part Designation RK73BW3A RK73HW3A Power T.C.R. Rating (ppm/�C) Max. 0.75W 1W Resistance Range - 1M Maximum Surge Current 5A 50m max. to +155�C Maximum Working Voltage Maximum Overload Voltage Rated Ambient Temp. Operating Temp. Range
Parameter Resistance T.C.R. Overload (Short time) RK73H, RK73B Requirement R �(%+0.1) Limit Typical Within specified tolerance Within specified T.C.R. �0.8% RK73Z Requirement Limit R50m N/A R50m Typical R40m N/A 25�C +25�C/-55�C and RK73B, RK73H Rated Voltage x 2.5 for 5 seconds (2B: Rated Voltage x 2 for 5 seconds) RK73Z: Max. surge current for 5 seconds 5�C, 10 seconds � 1 second Test Method
Rapid Change of Temperature Moisture Resistance Endurance at 70�C High Temperature Exposure Sulfuration Test
-55�C (30 minutes), +125�C (30 minutes), 100 cycles 2�C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle 2�C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle +155�C, 1000 hours H2S 1000 ppm, 90%Rh, 720 hours
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