40NSR120 Metal Diode 40A 1200V Rectifier

The 40NSR120 is a 1200V, 40A heavy-duty standard recovery rectifier diode manufactured by Naina Semiconductor Ltd. for industrial power supplies, motor controllers, battery chargers, and high-power rectification applications. Housed in a rugged metal DO-203AB (DO-5) stud-mount package, this discrete component features a reverse-polarity configuration (Anode to Stud) designed with metric or UNF threads to optimize thermal management directly through a heatsink. It operates with a maximum repetitive peak reverse voltage of 1200V and an average forward rectified current of 40A at a 150 degrees Celsius case temperature. Engineered with a maximum peak forward voltage drop of 1.2V at a 40A test current and a high one-cycle non-repetitive surge current capability of 500A, this robust device delivers reliable performance across an operating junction temperature range from minus 65 to plus 150 degrees Celsius.