A Zener diode is a special kind of diode which allows current to flow in the forward direction same as an ideal diode, but will also permit it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage. A Zener diode exhibits almost the same properties, except the device is specially designed so as to have a greatly reduced breakdown voltage.
The Zener diode's operation depends on the heavy doping of its p-n junction allowing electrons to tunnel from the valence band of the p-type material to the conduction band of the n-type material.
All such diodes, regardless of breakdown voltage, are usually marketed under the umbrella term of "Zener diode".
Kingtronics have much better prices offer for below zener diode, especially BZX55C and BZV55C.
1/2W BZV55C 2V7 - BZV55 C47 LL-34 Tape & Reel
1/2W BZX55C 2V7 - 8V2 DO-35 Bulk or Ammo
1W 1N4729A - 1N4756A DO-41 Bulk or Ammo
1/2W ZMM2V4 - ZMM47 LL-34 Tape & Reel
1W ZM4729A - ZM4756A LL-34 Tape & Reel
Please check our website www.kingtronics.com, you can download all PDF datasheet...