WA8478 Flyback Transformers Coilcraft WA8478 Flyback Transformer is halogen free and designed for use with the isolated flyback DC-DC regulator in the Analog Devices ADP1031 isolated micropower management unit (µPMU). This transformer features 2250Vrms one-minute isolation from primary to secondary and an input voltage range of 4.5V to 60V. Coilcraft WA8478 Flyback Transformer is AEC-Q200 Grade 1 qualified and has an ambient temperature range of -40°C to +125°C.