Current Sensing Resistors, Metal Plate Type Current Sensing Resistors, Metal Plate Type Type: ERJM1W Features ● Low resistance values and high precision (1 mΩ to 20 mΩ) resistance not influenced by measurement position ● High heat emission ● Low profile, strong body ● Inductance less than 1.0 nH for the metal plate structure ● RoHS compliant ● Stable ■ As for Packaging Methods, Soldering Conditions and Safety Precautions, Please see Data Files Explanation of Part Numbers 1 2 3 4 5 6 7 8 9 10 11 12 E R J M 1 W S F 3 M 0 U Product Code Thick Film Chip Resistors Size, Power Rating Code Inch Power R. M1W 2512 1W Type Code S General type T Wide terminal type Packaging Methods Packaging Embossed Carrier Taping U 4 mm pitch, 3,000 pcs. Resistance Tolerance Code F J Tolerance ±1% ±5% Code Resistance Value Shown by 3 digits or letters. Decimal point is expressed by M as 3 mΩ=3M0, 10 mΩ=10M Ratings Part No. Power Rating Standard (inch size) at 70 °C (W) Resistance (mΩ) ERJM1WS (2512) ERJM1WT (2512) 1 Resistance Tolerance (%) 3, 4 ±350 5, 6, 10, 15, 20 ±100 1, 1.5 Category Temperature Range (°C) T.C.R. -6 (×10 /°C) F: ±1, J: ±5 You should use the –55 to +170 350±100 2, 3, 4 Circuit board of use aluminum substrate when the added wattage exceeds 0.5 W. 100±50 ✽ Please contact the factory for other values and the range 120 100 Rated Load (%) Power Derating Curve For resistors operated in ambient temperatures above 70 °C, power rating shall be derated in accordance with the figure on the right. 70 °C 80 60 40 20 0 –55 –40 170 °C 155 °C 0 40 80 120 160 200 Ambient Temperature (°C) Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 08 Oct. 2014 Current Sensing Resistors, Metal Plate Type Construction Dimensions in mm (not to scale) T a W L Terminal; Plated Metal Resistive Body; Alloy Plate Protective coating; Resin Type Part No. (inch size) Dimensions (mm) L W T a ERJM1WS 6.40±0.25 1.00±0.25 (2512) 3.20±0.25 0.80±0.30 ERJM1WT T Type 6.40±0.40 2.10±0.30 (2512) S Type Mass (Weight) [g/1000 pcs.] 70 90 Recommended Land Pattern ● An example of a land pattern a b Wiring pattern (copper trace) Land pattern Solder resist c Part No. ERJM1WS ERJM1WT a 2.1 3.1 Dimensions (mm) b 3.4 3.4 Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 08 c 4.2 2.2 Oct. 2014