This document describes the features and applications of the HFA04SD60S ultrafast soft recovery diode. The diode has ultrafast recovery time, ultrasoft recovery, very low IRRM, very low Qrr, and guaranteed avalanche characteristics. It is optimized to reduce losses and EMI/RFI in high-frequency power conditioning systems. It is ideally suited for freewheeling, flyback, power converters, motor drives, and other applications where high speed and reduced switching losses are design requirements.