The 1SMB5945BT3G is a 2.0A ultra fast-recovery rectifier diode from ON Semiconductor. It has a reverse breakdown voltage of 45V, a forward voltage drop of 1.4V, and an average forward current of 2A with a peak of 3A. The device comes in an SMA package and has an internal protection from electrical surges. It is designed for use in both AC to DC converters and DC-to-DC converters, making it ideal for off-line applications such as switching power supplies, LED drivers, motor controls, etc.