hi there;
I’m new at hear.And I’m not prety good at electronic work.
Today I have questions to ask you.
Firstly. Could you please substantiate what is the difference between a zener diode and transil diode?
Then my circuit need to use a bidirection transil diode but I can’t find it in My country(Thailand) Could I use 2 unidirection transil diodes instead of a bidirection diode?
Thanks All of you
A transil diode is also know as a transient voltage suppression (TVS) diode. A good description is here in Wiki:
http://en.wikipedia.org/wiki/Transient_ … sion_diode
Its main difference from a zener is it acts much faster enabling it to clamp very fast short spikes and it can handle much high current (for short periods). They work very well to clamp ESD on I/O connectors.
Yes, you can use two TVS’s back to back to create a bi-direction TVS. I do this when I can not get a bi-directional TVS in the voltage cut-off I wish.
When you get one try measure it in both directions with the diode scale of a DMM.
Farnell have a Thailand office, and they have hundreds of bi-directional TVS devices. It looks like these devices are not actually stocked in Thailand, but if it’s anything like the Australian office, you will just get charged a local shipping rate and it will be delivered in a few days (even though it’s coming from overseas). Actually, at the moment Farnell Australia has free shipping - not sure about the Thai office.