This specification covers the performance requirements for fast recovery silicon rectifier diodes. Four levels of product assurance (JAN, JANTX, JANTXV and JANS) are provided for each encapsulated device. Two levels of product assurance (JANHC and JANKC) are provided for each un encapsulated device type. Provision for radiation hardness assurance (RHA) to four radiation (\"M\", \"D\", \"R\", and \"H\") test levels is provided for JANTXV and JANS product assurance levels.