1N4742A Zener Diode Pinout, Equivalents, Applications, Explanation and Other Useful Info

If you are looking for a reliable 12V 1W zener diode then 1N4742A diode can be a good choice. The post below contains 1N4742A zener diode pinout, equivalents, applications, explanation and other useful information about this diode.


1N4742A Zener Diode Pinout, Equivalents, Applications, Explanation 



Features / Technical Specifications

  • Package Type: Available in DO-41
  • Diode Type: 12V Voltage Regulator / Zener Diode
  • Working Voltage (Vz (V) @ Iz)12 Volts
  • Continuous Fwd Current (IF)500mA
  • Non-repetitive Max Reverse Current (Izsm)380mA
  • Total Power Dissipation: 1000mW
  • Zener Voltage Tolerance:  ± 10%
  • Max Storage & Operating temperature Should Be: -65 to +200 Centigrade


1N4742A Replacement and Equivalent

The nearest possible alternatives are: BZX79C12 (500W), ZMM12 (500W), 1N5242 (500mW)


1N4742A Diode Explained / Description

1N4742A identical to 1N4742 is a DO-41 package zener diode. It is a diode of 1N474x series which is a series of zener diodes and there are several other voltage zener diodes such as 3.3V, 5.1V, 6.0V

A,  zener diode is designed to use in voltage regulation tasks in electronic circuit. It uses a resistor in the series (which is very important to use) it limits the current flows through the zener diode. Moreover unlike other rectifier diodes for example 1N4148, 1N4007 etc in which current flows from anode to cathode but in zener diode the current flows from cathode to anode or in reverse direction which makes zener diode capable to perform voltage regulation.

It can drive maximum load of 500mA but you can also drive more current by using a high current transistor and the total power dissipation of the transistor is 1000mW. The maximum storage temperature and operating temperature of the diode is from -65°C to +200°C, the max 200°C temperature survival capability makes it ideal to use in variety of applications which require high temperature survival components.


Where We Can Use It

Zener didoes can be used for many purposes such as voltage regulation, switching, over voltage protection, clipper applications, Voltage reference etc.



Power supplies

Battery chargers

Voltage limiting

Solar applications

Automotive applications

And much more


Safe Operating Guidelines / Absolute Maximum Ratings

Here are the safe operating guidelines for this diode. First of all it is recommended that the diode should not be used on its absolute maximum ratings, and should be used 20% below from its absolute maximum ratings.

The maximum Continuous Fwd Current (IF) of the diode is 500mA therefore do not drive load of more than 400mA, the maximum reverse voltage should be greater than 5V, the total power dissipation should be under 800mW. Moreover the diode should be operated or stored at temperatures above -65°C and below +200°C


1N4742a Datasheet :

To download the datasheet just copy and paste the below link in your browser.


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