Contents
Why do you need a TVS protection diode?
It protects integrated circuits and others from high-voltage ESD entering from a USB line etc. TVS diodes absorb abnormal voltage from interfaces, external terminals, etc., prevent malfunction of circuits and protect devices. They are suitable for absorbing and suppressing static electricity or short-pulse voltage.
How to use TVS diodes for transient voltage suppresison?
The primary way to protect a circuit from overvoltage is to place these TVS devices in parallel with the circuit. There are many types of TVS device that can be used for Transient Voltage Suppression namely Metal Oxide Varistor, TVS Diode, Zener Diode or a Bypass Capacitor.
How to choose the best TVS diode for your electronic application?
Lastly, you will need to choose the TVS component by establishing the maximum clamping voltage of the devices when subjected to high-voltage pulse impulse conditions. In normal circumstances, the most suitable clamping voltage should be about 35-30% higher than the maximum breakdown voltage or at least 60% higher than the rated standoff voltage.
What is the breakdown voltage of a TVS diode?
A TVS diode is characterized by: Leakage current: the amount of current conducted when voltage applied is below the maximum reverse standoff voltage. Maximum reverse standoff voltage: the voltage below which no significant conduction occurs. Breakdown voltage: the voltage at which some specified and significant conduction occurs.
What does a bidirectional TVS diode symbol mean?
Symbol of a Bidirectional TVS diode is shown in below image. TVS Diodes are connected in parallel with the device or circuit to be protected. The TVS device is specifically designed to breakdown at a specific voltage level and conducts large amounts of current without sustaining damage.
When does the TVS diode go away what happens?
When the normal voltage exceed to a certain level, the TVS diode junction avalanches and as the result overvoltage is diverted from the protected circuit and shunted through the TVS diode. The device automatically resets when the overvoltage goes away.
What is the purpose of an ESD protection diode?
It is a diode that is mainly used for static electricity (ESD) countermeasures. It protects integrated circuits and others from high-voltage ESD entering from a USB line etc.