OSR5MK5A31A is a model of rectifier diode manufactured by Optosupply. It is part of their OSR series which are designed for high-efficiency, high-power conversion efficiency applications requiring high reverse surge ratings. The OSR5MK5A31A has a maximum average forward current of 5A, a peak forward current of 130A and a maximum repetitive peak reverse voltage of 5V. It has an industry standard 5-pin SMA package and is designed to operate in environments with temperatures ranging from -55°C to 125°C. It is UL, CSA, VDE, CQC, and RoHS certified.