WEE Technology Company Limited
Manufacturer of Surface Mounted (SMD) and Throught Hole (DIP) Diodes and Rectifiers.

How to understand the code of Zener Diode, usually you can easily follow the part number or read the marking on the Zener Diode body, such as below:

5.1=5.1 Volt zener diode

5V1=5.1 Volt zener diode

12= 12 Volt zener diode

12V= 12 Volt zener diode

BZX85C22=22 Volt 1 watt zener diode

BZV55C4V7=4.7 Volt 500m watt zener diode

But sometimes you have to read the datasheet and find our the exact meaning of the Zener Diode voltage and power dissipation, for instance 1N4727A-1N4761A series 

1N4739A = 9.1 Volt zener diode

1N4754A = 39 Volt zener diode

When you have any problem in choosing a right Zener Diodes, you have to check with the manufacturer's code book. Below is the strong  WEET Zener Diodes list. We are ready to serve you .

Silicon Planar Zener Diodes BZX84C

Silicon Planar Power Zener Diodes BZX85C

Silicon Planar Power Zener Diodes 1N4727A-1N4761A

Silicon Epitaxial Planar Zener Diodes ZMM1-ZMM75

Silicon Planar Power Zener Diodes ZM4727-ZM4761

Zener Diodes 500m watt BZV55-SERIES

Zener Diodes 500m watt BZV55B-SERIES

Zener Diodes 500m watt BZX55C