U1M is a High Effic Rectifier ROHS manufactured by YFSEMI. It has an operating temperature range of -55? ~ +150? (Tj) and an Isolation Voltage rating of 1kV. It has a forward current of 1A at 1.7V and reverse leakage current of 5uA at 1kV. It also has a maximum reverse recovery time of 75ns. This part is packaged in a SOD-123FL package.