Standard Zener Diodes ROHM Semiconductor Standard Zener Diodes are available in various types, such as 2-pin mold surface mount types and complex types. ROHM Standard Zener diodes are highly reliable and offer superior surge resistance for supporting automotive and industrial standards. The standard Zener diodes feature an epitaxial planar construction in a small power mold package. These Zener diodes are ideal for voltage regulation applications.