Zener Diodes Toshiba Zener Diodes feature an ±12, ±20, or ±30 electrostatic discharge voltage in a variety of packages. The Zener Diodes feature 150mW, 200mW, and 600W power dissipations. The Toshiba Zener Diodes are ideal for voltage surge protection applications and are available in a USM, USC, ESC, and S-Mini packages.