MBR1240MFS, NRVB1240MFS Switch-mode Power Rectifiers Features Low Power Loss / High Efficiency MBR1240MFS, NRVB1240MFS THERMAL CHARACTERISTICS Characteristic Symbol Typ Max Unit Thermal Resistance, JunctiontoCase, Steady State R 1.7 C/W JC 2 (Assumes 600 mm 1 oz. copper bond pad, on a FR4 board) ELECTRICAL CHARACTERISTICS Instantaneous Forward Voltage (Note 1) v V F (i = 12 A, T = 125C) 0.455 0.62 F J (i = 12 A, T = 25C) 0.53 0.68 F J Instantaneous Reverse Current (Note 1) i mA R (Rated dc Voltage, T = 125C) 35 170 J (Rated dc Voltage, T = 25C) 0.08 0.5 J 1. Pulse Test: Pulse Width = 300 s, Duty Cycle 2.0%.