The ST20-36F2-5103 is a five-terminal Power Zeners Trankillers manufactured by Shindengen. It is specially designed for use in applications such as overvoltage, overcurrent protection, and circuit isolation. The part is made up of Zener diodes, which are a form of electrical components that regulate voltage levels by allowing the current to flow in only one direction, while blocking any current that exceeds the breakdown voltage, thus providing overvoltage protection and circuit isolation. The part is rated at 20 volts, has a maximum power dissipation of 36 watts, and contains five terminals.