MB158 is a rectifier diode manufactured by DC Components. It is a 1.5A, 500V ultra-fast switching diode. It has a maximum reverse voltage of 500V, a maximum forward current of 1.5A, a maximum surge forward current of 8A, and a maximum surge reverse current of 10mA. It has a maximum junction temperature rating of 150°C, a peak reverse voltage of 500V, and a reverse recovery time of 10ns. This diode is used in voltage regulation and surge protection circuits, as well as as a switching diode in many higher power applications.