1733 Reader's Spreads pg1-203:document 1/27/09 4:04 PM Page 40 LR72A, B, C resistors 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 Copper Nickel Alloy Termination LR72A 3.75 size only W t d L2 L L2 LR72A Dimensions inches (mm) L2 +0.1 W t -.02 Size Code L LR72A (8.00) .39±.004 (10.0±0.1) .079 (2.0) .20±.008 (5.2±0.2) .079 (2 Max.) .006 (0.16) LR72A (5.00) .39±.004 (10.0±0.1) .079 (2.0) .20±.008 (5.2±0.2) .079 (2 Max.) .009 (0.22) LR72A (3.75) LR72A (2.50) .39±.004 (10.0±0.1) .39±.004 (10.0±0.1) .079 (2.0) .079 (2.0) .20±.008 (5.2±0.2) .20±.008 (5.2±0.2) .079 (2 Max.) .079 (2 Max.) .013 (0.32) .019 (0.47) d Copper Nickel Alloy W t d Termination g g L2 L LR72A (2mΩ) LR72B L2 Dimensions inches (mm) W t d Size Code L LR72A (2.00) .39±.004 (10.0±0.1) .079 (2.0) .20±.008 .079 (5.2±0.2) (2 Max.) .027 (0.68) .043±.008 (1.1±0.2) LR72B .39±.004 (10.0±0.1) .079 (2.0) .118±.008 .079 (3.0±0.2) (2 Max.) .026 (0.66) .043±.008 (1.1±0.2) L2 +0.1 -.02 g W Copper Nickel Alloy t Termination d a L Size Code LR72C Dimensions inches (mm) W t a L .44±.016 (11.2±0.4) d .126±.016 .137±.016 .189±.030 .093±.010 (3.2±0.4) (3.5±0.4) (4.8±.75) (2.35±.25) LR72C 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) TE Packaging TE: 7" embossed plastic (LR72A, B) TEB: 13" embossed plastic (LR72C) 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. 42 12/16/08 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com 1733 Reader's Spreads pg1-203:document 1/27/09 4:04 PM Page 41 PMS 300 neg. Black neg. metal plate current sense resistors applications and ratings T.C.R. (ppm/°C) Max. Part Designation Power Rating LR72A 1/2W @ 25°C LR72B 1/4W @ 25°C LR72C 1W @ 70°C ±100 ±350 Standard Resistance Resistance Tolerance 2mΩ ~ 8mΩ 3mΩ ~ 5mΩ 2mΩ, 3mΩ J: ±5% Rated Ambient Temperature Operating Temperature Range +70°C -40°C to +180°C +85°C -40°C to +155°C 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) Performance Characteristics Parameter Resistance T.C.R. Resistance to Solder Heat Moisture Resistance Load Life Requirement Within regulated tolerance Within specified T.C.R. ±2.0% ±5.0% ±5.0% (A & B), ±3% (C) Test Method (JIS C 5202) 25°C Room temperature/100°C up, LR72C: Room temperature/25°C ~ 200°C 350°C ± 10°C, 3 seconds; LR72C: 260°C ± 5°C, 10 seconds Power rating x 1/10, 40°C, 90 - 95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle Rating 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. 12/16/08 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com 43 resistors LR72A, B, C