Zener Diodes are in stock at Tenco Electronics. Tenco offers inventory, pricing, & datasheets for Zener Diodes. A Zener diode allows current to flow from its anode to its cathode like a normal semiconductor diode, but it also permits current to flow in the reverse direction when its "Zener voltage" is reached.To know more, please view our large section of Zener Diodes below.