KOA SPEER ELECTRONICS, INC. SS-238 R5 AHA 3/20/13 Metal Plate Current Sense Resistor Type LR72 A/B/C CERTIFIED CERTIFIED 1. Features ■ ■ ■ ■ Superior thermal expansion cycling Inductance less than 10 nanohenries Flameproof Custom values available ■ ■ ■ ■ Lead flexible for thermal expansion Low termination stress (“J” leads) Shape provides cooler operation Solderable pads (60/40 SnPb plate) 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 (LR72C only) N: CuNi (non-presolder) (LR72A, B only) TE: Embossed plastic 2mΩ: 2L0 “L” indicates the decimal in milliohms J: ± 5% 4. Standard Applications 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 Bolivar Drive ■ P.O. Box 547 ■ Bradford, PA 16701 ■ USA ■ 814-362-5536 PAGE 1 OF 4 ■ 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. KOA SPEER ELECTRONICS, INC. SS-238 R5 5. Dimensions LR72A LR72B Size Code a Resistive Plate 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) __ .126±.016 .137±.016 (3.2±0.4) (3.5±0.4) t L L2 L2 LR72C a Resistive Plate t Solder Coat L 6. 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 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. KOA SPEER ELECTRONICS, INC. SS-238 R5 7. Derating Curve 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. 100 LR72C % Rated Power 80 60 40 LR72A, 72B 20 0 -40 160 200 80 120 70 85 155 180 Ambient Temperature (°C) 0 40 8. Packaging Specifications 8.1 Carrier Dimensions 1.5 +0.1 -0 A B W 1.75±0.1 Carrier Tape P1 (TP) 2.0 4.0±0.1 P1 T1 T1 T1 Direction of feed (Notes) Dotted lines are applicable to only “TP” and “TB.” Component Size (mm) Type LR72 A B C L W T 10±0.2 10±0.2 11.2±0.4 5.2 3 3.2±0.4 2 2 3.5±0.4 Carrier Tape Taping (mm) Quantity/ Reel (Pieces) A B W P1 T1 Reel Size 2000 2000 1500 1.45±0.2 1.45±0.2 1.17±0.1 5.7±0.2 3.4±0.2 4.3±0.1 24±0.2 24±0.2 24±0.2 8.0±0.10 8.0±0.10 8.0±0.1 2.3±0.2 2.5±0.2 4.4±0.15 255 255 330 TE TE TE 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. KOA SPEER ELECTRONICS, INC. SS-238 R5 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.