40HFR30 Rectifier by International Rectifier. 40Amp, 300 Volt Package: Stud base DO-203AB (DO-5) 1/4" 28UNF-2A Download IR 40HFR series (*) datasheet: Status: NOS (New Old Stock) Individually tested components: YES RoHS compliant: no (*note): 300Volt version not mentioned.