resistors LR72A, B, C metal plate current sense resistors EU features • • • • • Superior thermal expansion cycling Inductance less than 10nH Solderable pads (60/40 SnPb plate) Lead flexible for thermal expansion Products with lead-free terminations meet EU RoHS and China RoHS requirements dimensions and construction LR72A LR72B Size Code a L Dimensions inches (mm) L2 +0.1 W -.02 t LR72A .39±.004 (10.0±0.1) .079 (2.0) .20±.008 (5.2±0.2) .079 (2 Max.) LR72B .39±.004 (10.0±0.1) .079 (2.0) .118±.008 (3.0±0.2) .079 (2 Max.) LR72C .44±.016 (11.2±0.4) __ Resistive Plate .126±.016 .137±.016 (3.2±0.4) (3.5±0.4) t L2 L2 L LR72C a Resistive Plate t Solder Coat L ordering information New Part # LR72 A Type Size A B C D Termination Material D: SnAgCu (LR72C only) N: CuNi (non-presolder) (LR72A, B only) TED Packaging TED: LR72A LR72B TEB: LR73C 2L0 Nominal Resistance 2mΩ: 2L0 “L” indicates the decimal in milliohms J Tolerance J: ±5% 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. 56 1/24/14 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com metal plate current sense resistors applications and ratings Part Designation Power Rating* LR72A 1/2W LR72B 1/4W LR72C 1W T.C.R. (ppm/°C) Max. Standard Resistance** Resistance Tolerance 2mΩ ~ 8mΩ ±100 3mΩ ~ 5mΩ ±350 J: ±5% 2mΩ, 3mΩ Rated Ambient Temperature Operating Temperature Range +70°C -40°C to +180°C +85°C -40°C to +155°C * Rated power in case of glass epoxy resin (FR-4) is used for the substrate material ** Please contact factory for custom made resistance values environmental applications Derating Curve 100 LR72C % Rated Power 80 60 40 LR72A, 72B 20 0 -40 0 40 80 120 160 200 70 85 155 180 Ambient Temperature (°C) 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. Performance Characteristics Parameter Resistance T.C.R. Requirement ∆ R ±% Limit Typical Within specified –– tolerance Within specified –– T.C.R. Test Method 25°C Room temp. +100°C UP Resistance to Soldering Heat ±2.0% ±1.6% 350°C ± 10°C, 3 seconds Moisture Resistance ±5.0% ±4.5% Power rating x 1/10, 40°C, 90% - 95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle Endurance at 70°C ±5.0% ±4.5% Rated voltage 70°C, 1000 hours 1.5 hr ON, 0.5 hr OFF cycle Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/17/12 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com 57 resistors LR72A, B, C