Diode PIV question ?

[thylantyr]

Two diodes in series, 100v PIV each.

What is total PIV across both ? 200V ?

I can't remember, loss of long term
brain RAM....

 

[dhaen]

Hi,

I believe that PIV is only doubled if you add a leak resistor in parallel with each diode(10K to 10M) depending on the voltage.
Personally, I wouldn't push it all the way.

Cheers,

 

[thylantyr]

The Counsel of Three Head Scratching Elders told me;;;;

I always ask the weirdo questions....

 

[Jocko Homo]

A small cap across them would not hurt either, but..........

Why not buy 200 PIV in the first place? The 100 V ones are of a lower grade run than the 200 V ones.....or 400 V ones, etc.

Unless you are using Schottky.

Jocko

 

[thylantyr]

It's more or less just an exam type of question, I'm
not building anything.

So far no definitive answer given

I'm afraid to ask the second question.

scenario;
Ordinary NPN transistor with a V(br)EBO = 5V
(emitter-base breakdown voltage).

Reverse bias of base/emitter > 5V = bad news for the transistor?
if yes
then second question


A ordinary diode in series with base of this transistor reversed biased, the anode connects to base. Diode PIV = 100v.

What is total reverse bias breakdown voltage between cathode and emitter ?

 

[dhaen]

What is total reverse bias breakdown voltage between cathode and emitter ?

100 volts.