Zener diode that protects from various surges of overvoltage pulse

A Zener diode is characterized by its ability to protect an object from transient overvoltage pulses as well as overvoltage pulses close to DC, which are difficult to protect against with ESD protection diodes.

Corresponding area of Zener diode suitable for overvoltage protection
Corresponding area of Zener diode suitable for overvoltage protection

In addition to ESD, there are induced lightning surges and switching surges with long pulse widths (in the order of microseconds to milliseconds) as overvoltage pulses to be considered in circuit design.

Graph1
Graph2
Graph3

In order to protect an object from overvoltage pulses with long pulse widths, it is necessary to select a product according to the assumed surge energy. 
In the case of overvoltage pulses such as that shown in the figure above, the grey portion in the figure will be energized to the Zener diode, so it is necessary to check whether the power is acceptable.
Use the above equation to approximate a square wave and calculate the pulse width. The surge power tolerance for each product is set as shown in the graph. Confirm that the Zener surge power tolerance for tW after approximating the square wave is not a problem in designing.

Zener Diodes

Related information

Contacts

Technical inquiry

Contact us

Contact us

Frequently Asked Questions

FAQs

Queries about purchasing, sampling and IC reliability

Stock Check & Purchase

keyword:

Disclaimer for External Link
Through this website you are able to proceed to the website of our distributors ("Third Party Website") which is not under the control of Toshiba Corporation and its subsidiaries and affiliates (collectively "Toshiba"). The Third Party Website is made available to you as a convenience only and you agree to use the Third Party Website at your own risk. The link of the Third Party Website does not necessarily imply a recommendation or an endorsement by Toshiba of the Third Party Website. Please be aware that Toshiba is not responsible for any transaction done through the Third Party Website, and such transactions shall be subject to terms and conditions which may be provided in the Third Party Website.
A new window will open