ROHM manufactures bidirectional Zener Diodes that allow for multiple (single, dual, triple) configurations. ROHM’s RSB16VA is a dual-type rated at 500mW. They are able to offer 500mW in a small package by utilizing a larger termination with greater heat dissipation characteristics. Bidirectional Zeners are designed to protect against forward and reverse surges and reduce both component count and set size. This slide illustrates part of an engine control unit circuit where a single bidirectional Zener Diode is used to protect both the Gate and Source of a power MOSFET.