Ultra fast rectifier 2

[Bicky22]

Hi all.

Is it possible for something to cause a ultra fast semiconductor rectifier diode to a temporarily act as a short and allow reverse current flow? Temperature, Voltage transient, etc.?

I have some diodes that were claimed to be allowing reverse voltage for an extended period of time (1-5 seconds minimum). Short of sending the diodes out for an optical analysis, I do not see anything wrong. I have little to zero knowledge of the application or environment this happened in.

I understand this is a broad question. I am just looking for a place to start.

Thank you All.

 

[jacksopher]

ES3D is a 200 Vrev 3 Amp 20nS fast recovery diode.
there is no such thing in this diode that with 24V you can get 5 seconds of reverse current.
what happens after 5 seconds? The data you are giving us is faulty or the diode is broken and should be replaced with another of the same part number.
I have used these diodes in several switching power supplies. if you have 5 seconds of reverse current in a rectifier circuit the transformer will burn up because you are making a short across the winding.