Powersem psb 21 series 21a single phase bridge rectifiers pcb terminals powersem psb 21 08 a single phase 21a 800v bridge rectifier diode in an eco pac modular package that has a dcb ceramic base plate the diode has a high power density and very low forward voltage drop and is manufactured using multiple chip technology mct ensuring excellent quality and reliability as well as providing improved power cycling performance and temperature handling capabilities the diode is easy to install