Diode Configs: Same Work | Rectify Me Please

[debajyoti datta]

2 diodes connected back to back ...and 2 anti-parallel diodes...are these 2 configurations same...i mean work similarly?...i think NO...rectify me please if wrong...it might be a silly question but i would really appreciate the answer

 

[NascentOxygen]

2 diodes connected back to back

So that whichever way current tries to flow, there will always be one diode which blocks the current? Draw it and try it.

 

[debajyoti datta]

in back to back connected diodes...current will never flow...right?

 

[NascentOxygen]

in back to back connected diodes...current will never flow...right?

Yes, that is so.

Yet there may be times when you do see a pair of diodes ("Zener diodes") connected exactly like that: back-to-back. What is this about?

 

[debajyoti datta]

Sir,i have seen that in double sided clipping circuits..so that output is between (Vz.+Vk) and - (Vz.+Vk)..actually my question arose from there

 

[Windadct]

Careful..never?...zener back to back make a voltage regulator
Rectifier diodes are sold back to back as a high frequency smps rectifer using the center point as the AC location, and signal diodes are connected back to back as a decision point (probably not the right term) but I see them all the time.
The latter two are 3 terminal circuits, so without context, the question could be misleading.