At its working voltage the diode is essentially an open circuit, ie it is “invisible”. However, if the diode is subjected to a sustained overvoltage, then it will sacrifice itself by going short circuit.Ī TVS diode is rated according to its working or stand-off voltage, and its breakdown voltage. If the overvoltages are of sufficiently short duration (< 8usec), then the diode will recover and continue working. It protects a sensitive circuit by diverting damaging overvoltages and spikes away from the load.
The information that follows is based almost exclusively on user feedback and on discussions in various storage and data recovery forums, including this one.ġ/ What is a TVS diode and what does it do?Ī TVS ( Transient Voltage Suppression ) diode works by clamping voltage spikes. In most instances this diode succeeds in protecting the remaining electronics from further damage, in which case the solution involves an easy, no-cost DIY fix. This often results in the failure of a TVS diode. The usual scenario is that a hard drive has been overvolted, either as a consequence of a power supply failure, or as a result of user error. The purpose of this article is to address a question that pops up on a regular basis at various storage forums.
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