SS-238 R3 6/1/07 5:13 PM Page 1 KOA SPEER ELECTRONICS, INC. SS-238 R3 AHA 6/01/07 Surface Mount Custom Milli-Ohm Resistor Type LR72 A/B/C CERTIFIED CERTIFIED 1. Features ■ ■ ■ ■ ■ Superior thermal expansion cycling Inductance less than 10 nanohenries Flameproof Available Pb-free/RoHS compliant ■ ■ ■ Lead flexible for thermal expansion Low termination stress (“J” leads) Shape provides cooler operation Custom values available 2. Applications ■ ■ ■ ■ Current sensing Low inductance AC applications (please contact factory) ■ Feedback Surge & pulse 3. Type Designation The type designation shall be in the following form: New Type LR72 A D TE 2L0 J Type Size Termination Material Packaging Nominal Resistance Tolerance A B C D: SnAgCu N: CuNi* (non-presolder) (Other termination styles may be available, please contact factory for options) TE: 7" embossed plastic (LR72A, B - 2,000 pieces/reel) (LR72C 1,500 pieces/reel) 2mΩ: 2L0 “L” indicates the decimal in milliohms J: ± 5% 4. Standard Applications T.C.R. (ppm/°C) Max. Part Designation Power Rating LR72A LR72B LR72C 1/2W @ 25°C 1/4W @ 25°C 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 PAGE 1 OF 4 Bolivar Drive ■ P.O. Box 547 ■ Bradford, PA 16701 ■ USA ■ 814-362-5536 ■ Fax 814-362-8883 ■ 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. SS-238 R3 6/1/07 5:13 PM Page 2 KOA SPEER ELECTRONICS, INC. SS-238 R3 5. Dimensions Copper Nickel Alloy Termination LR72A 3.75 size only W t d L2 L L2 LR72A Dimensions inches (mm) W t L2 +0.1 -.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 Size Code g L2 L LR72B L2 Dimensions inches (mm) L2 +0.1 W t d -.02 L .39±.004 (10.0±0.1) .079 (2.0) .118±.008 .079 (3.0±0.2) (2 Max.) .026 (0.66) g .043±.008 (1.1±0.2) LR72B W Size Code Copper Nickel Alloy t LR72C Dimensions inches (mm) W t a L d .44±.016 .126±.016 .137±.016 .189±.030 .093±.010 (11.2±0.4) (3.2±0.4) (3.5±0.4) (4.8±.75) (2.35±.25) Termination d a L LR72C 6. Characteristics Item Requirement Test Methods (JIS C 5202) Resistance Within regulated tolerance 25°C T.C.R. Within specified T.C.R. Room temperature/100°C up, LR72C: Room temperature/25°C ~ 200°C Resistance to Soldering Heat ± 2.0% 350°C ±10°C, 3s; LR72C: 260°C ± 5°C, 10 seconds Solderability 95% Coverage min. 235°C ±5°C, 5s Moisture Resistance ±3% 40°C 90% ~ 95% RH, 1000h. No load Moisture Resistance ±5% Power rating X 1/10, 40°C, 90% ~ 95% RH. 1000h, 1.5h ON 0.5h OFF cycle Load Life ±5% (A & B), ±3% (C) Rating voltage, 1000h, 1.5h ON 0.5h OFF cycle PAGE 2 OF 4 Bolivar Drive ■ P.O. Box 547 ■ Bradford, PA 16701 ■ USA ■ 814-362-5536 ■ Fax 814-362-8883 ■ 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. SS-238 R3 6/1/07 5:13 PM Page 3 KOA SPEER ELECTRONICS, INC. SS-238 R3 7. Derating Curve For temperature in excess of 70°C, the load shall be derated in accordance with the following figure. 100 LR72C % Rated Power 80 60 40 LR72A, 72B 20 0 -40 0 160 200 80 120 70 85 155 180 Ambient Temperature (°C) 40 8. Packaging Specifications 8.1 Carrier Dimensions .059 (1.5 +0.1 -0 ) B E W A T1 Embossed Carrier P1 T1 P2 P0 Direction of Feed Dimensions in inches (mm) Type A B E W P0 P1 P2 T1 LR72A .057 .224 .069 (1.45 ± 0.2) (5.7 ± 0.2) (1.75 ± 0.1) .079 (2.0) .157 (4.0 ± 0.1) .315 (8.0 ± 0.1) .079 (2.0) .091 (2.3 ± 0.2) LR72B .057 .134 .069 (1.45 ± 0.2) (3.4 ± 0.2) (1.75 ± 0.1) .079 (2.0) .157 (4.0 ± 0.1) .315 (8.0 ± 0.1) .079 (2.0) .098 (2.5 ± 0.2) LR72C .461 .169 .069 .945 .157 (11.7 ± 0.1) (4.3 ± 0.1) (1.75 ± 0.1) (24.0 ± 0.2) (4.0 ± 0.1) .315 (8.0 ± 0.1) .079 (2.0) ___ PAGE 3 OF 4 Bolivar Drive ■ P.O. Box 547 ■ Bradford, PA 16701 ■ USA ■ 814-362-5536 ■ Fax 814-362-8883 ■ 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. SS-238 R3 6/1/07 5:13 PM Page 4 KOA SPEER ELECTRONICS, INC. SS-238 R3 8. Packaging Specifications (continued) 8.2 Reel Dimensions øA W1 E øc øB Dimensions in inches (mm) Type A B C E W1 LR72A 10.0 3.15 .511 .079 1.0 +1.0 LR72B (255 ± +0.0 -3.0 ) (80 ± -0 ) (13.0 ± 0.2) (2.0 ± 0.5) (25.5 ± 2.0) LR72C 12.99 3.94 .511 .079 1.0 (330 ± 2.0) (100 ± 2.0) (13.0 ± 0.2) (2.0 ± 0.5) (25.5 ± 2.0) 9. Pad Dimensions Dimensions in inches (mm) W L A L .622 (16.0) W .118 (3.0) H .236 (6.0) A .394 (10.0) B .622 (16.0) .118 (3.0) .150 (3.8) .394 (10.0) .C .369 (9.36) .121 (3.07) .142 (3.60) .127 (3.22) W A H PAGE 4 OF 4 Bolivar Drive ■ P.O. Box 547 ■ Bradford, PA 16701 ■ USA ■ 814-362-5536 ■ Fax 814-362-8883 ■ 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.