Diode PIV question ?

thylantyr · 28th May 2003, 05:25 AM

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 · 28th May 2003, 08:27 AM

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 · 28th May 2003, 03:10 PM

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

I always ask the weirdo questions....

Jocko Homo · 28th May 2003, 05:30 PM

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 · 28th May 2003, 08:07 PM

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 · 28th May 2003, 09:08 PM

Quote:

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

100 volts.

28th May 2003, 05:25 AM	#1
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	Diode PIV question ? Two diodes in series, 100v PIV each. What is total PIV across both ? 200V ? I can't remember, loss of long term brain RAM....

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28th May 2003, 08:27 AM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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,

28th May 2003, 03:10 PM	#3
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	The Counsel of Three Head Scratching Elders told me;;;; I always ask the weirdo questions....

28th May 2003, 05:30 PM	#4
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	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

28th May 2003, 08:07 PM	#5
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	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 ?

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