Zener Diode Voltage Regulator Circuit

Simple Zener Diode Voltage Regulator Circuit designed to give 5 volt output from 9 volt input, you can replace the zener diode to get desired output voltage. For a simple voltage regulation in the circuit or design zerner diode is the cost effective solution.




We know zener diode is a two terminal active device and specially known for zener breakdown operation. A zener diode or Breakdown diode is a PN diode specially designed for operation in the breakdown region in the reverse bias condition. This diode operates in zener breakdown or avalanche breakdown, However the word zener is used for all components having sharp breakdown characteristics in reverse direction.

Zener Diode

Zener diode has two terminals as Anode (A) and Cathode (K) and it is made of heavily doped P and N semiconductors these two regions creates depletion region at the junction. This zener diode is designed to operate at breakdown region during reverse bias.

V-I Characteristics of Zener diode

Here zener breakdown or avalanche breakdown occurs at reverse bias after reaching the breakdown point in terms of reverse voltage and current afterwards zener diode allows constant voltage with different current level.

Circuit Diagram

Available Zener Diodes

1/2W0.5W0.5W1W1W
VoltageDO-35LL34DO-41LL41
2V0BZX55C2V0ZMM2V0
2V2BZX55C2V2ZMM2V2
2V4BZX55C2V4ZMM2V4
2V7BZX55C2V7ZMM2V7
3V0BZX55C3V0ZMM3V01N4727AZM4727A
3V3BZX55C3V3ZMM3V31N4728AZM4728A
3V6BZX55C3V6ZMM3V61N4729AZM4729A
3V9BZX55C3V9ZMM3V91N4730AZM4730A
4V3BZX55C4V3ZMM4V31N4731AZM4731A
4V7BZX55C4V7ZMM4V71N4732AZM4732A
5V1BZX55C5V1ZMM5V11N4733AZM4733A
5V6BZX55C5V6ZMM5V61N4734AZM4734A
6V2BZX55C6V2ZMM6V21N4735AZM4735A
6V8BZX55C6V8ZMM6V81N4736AZM4736A
7V5BZX55C7V5ZMM7V51N4737AZM4737A
8V2BZX55C8v2ZMM8V21N4738AZM4738A
9V1BZX55C9V1ZMM9V11N4739AZM4739A
10VBZX55C10VZMM101N4740AZM4740A
11VBZX55C11VZMM111N4741AZM4741A
12VBZX55C12VZMM121N4742AZM4742A
13VBZX55C13VZMM131N4743AZM4743A
15VBZX55C15VZMM151N4744AZM4744A
16VBZX55C16VZMM161N4745AZM4745A
18VBZX55C18VZMM181N4746AZM4746A
20VBZX55C20VZMM201N4747AZM4747A
22VBZX55C22VZMM221N4748AZM4748A
24VBZX55C24VZMM241N4749AZM4749A
27VBZX55C27VZMM271N4750AZM4750A
30VBZX55C30VZMM301N4751AZM4751A
33VBZX55C33VZMM331N4752AZM4752A
36VBZX55C36VZMM361N4753AZM4753A
39VBZX55C39VZMM391N4754AZM4754A
43VBZX55C43VZMM431N4755AZM4755A
47VBZX55C47VZMM471N4756AZM4756A
51VBZX55C51VZMM511N4757A
56VBZX55C56VZMM561N4758A
62VBZX55C62VZMM621N4759A
68VBZX55C68VZMM681N4760A
75VBZX55C75VZMM751N4761A

You can use any of these zener diode as a Regulator in your design and put exact Rs Resistor according to the zerner diode and output voltage specifications.

In this schematic a 5.1 Volt zener diode is used in reverse bias, when the input voltage increase or above the zener breakdown then zener starts to conduct voltage up to the breakdown voltage level and gives regulated output voltage.




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