Zener Diode

University of Development

Alternative (UODA)Submitted To:Farzana Rahman MishuSr. lecturer

Submitted By:Kaniz Fatema

ChaitySharmin Sultana

Dept. of Computer Science & Engineering

Faculty of Engineering

Topic’s Covered What is Diode? Different types of Diode What is Zener Diode? Parameters V-I characteristics Advantages & Disadvantages Zener Diode as voltage regulator Circuit tips Reference

What is Diode?• A diode is a semiconductor device with two terminals,

typically allowing the flow of current in one direction only.

Different types of Diode

What is Zener Diode?

Electric Symbol

Figure: Zener Diode

Parameter Breakdown Voltage - UZ Breakdown Current - IZ Forward Bias Voltage - UF Reverse Current – IR Voltage Stabilization Factor

V-I characteristicsThe V-I Characteristics of a Zener Diode can be divided into two parts:Forward CharacteristicsReverse Characteristics

Advantages & DisadvantagesAdvantages:Control of flowing currentSize and ExpensePerformanceCompatibility and Obtainability

Disadvantages:Zener diodes cancel out voltages by applying even larger voltages in the reverse direction, wasting electricity in the process. Additionally, Zener diodes have a relatively poor regulation ratio and are generally not as good as transistors. 

Zener Diode as Voltage regulator

Circuit tips Choose correct voltage for best stability Buffer the Zener diode circuit with an emitter or

source follower Drive with constant current source for best

stability Ensure sufficient current for reverse breakdown Ensure maximum limits of current are not exceeded for

the Zener diode

Reference Wikipedia.com http://whatis.techtarget.com http://www.instructables.com/id/Types-of-Diodes http://www.reuk.co.uk/What-is-a-Zener-Diode.htm http://www.radio-electronics.com/info/data/semicond/diodes/types-of-diode

s.php http://blog.oureducation.in/v-i-characteristics-of-zener-diode http://www.allinterview.com/showanswers/143751/what-are-advantage-

and-disadvantage-of-zener-diode.html http://www.electrical4u.com/zener-diode-symbol-and-application-as-

voltage-regulator/ http://www.radio-electronics.com/info/data/semicond/zener-voltage-

reference-diodes/applications-circuits.php

Created by Mohammad Ali KhanDept. of Computer Science & Engineering

Faculty of Engineering

University of Development Alternative (UODA)