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Q&A Why 3.3V instead of 3V?

Usual values used in doing electronics/power supplies are almost always round numbers: 5V 12V 28V 48V 60V I understand that in some cases ICs are built to accept the voltage directly comi...

4 answers  ·  posted 3y ago by 2kind‭  ·  last activity 1y ago by TonyStewart‭

#4: Post edited by user avatar Lorenzo Donati‭ · 2023-08-17T20:43:39Z (about 1 year ago)
Corrected an abbreviation which is too specific and may stump newbies.
  • Why 3V3 instead of 3V?
  • Why 3.3V instead of 3V?
  • Usual values used in doing electronics/power supplies are almost always round numbers:
  • - 5V
  • - 12V
  • - 28V
  • - 48V
  • - 60V
  • I understand that in some cases ICs are built to accept the voltage directly coming from the lithium-ion cell in order to simplify the power stage, therefore, having 4.2V input.
  • But, what is the reason behind having a 3V3 voltage level omnipresent instead of 3V?
  • Usual values used in doing electronics/power supplies are almost always round numbers:
  • - 5V
  • - 12V
  • - 28V
  • - 48V
  • - 60V
  • I understand that in some cases ICs are built to accept the voltage directly coming from the lithium-ion cell in order to simplify the power stage, therefore, having 4.2V input.
  • But, what is the reason behind having a 3.3V voltage level omnipresent instead of 3V?
#3: Post edited by user avatar Lorenzo Donati‭ · 2023-08-03T19:10:33Z (about 1 year ago)
Typo.
  • Usual values used in doing electronics/power supplies are almost always round numbers:
  • - 5V
  • - 12V
  • - 28V
  • - 48V
  • - 60V
  • I understand that in some cases IC's are built to accept the voltage directly coming from the lithium-ion cell in order to simplify the power stage, therefore, having 4.2V input.
  • But, what is the reason behind having a 3V3 voltage level omnipresent instead of 3V?
  • Usual values used in doing electronics/power supplies are almost always round numbers:
  • - 5V
  • - 12V
  • - 28V
  • - 48V
  • - 60V
  • I understand that in some cases ICs are built to accept the voltage directly coming from the lithium-ion cell in order to simplify the power stage, therefore, having 4.2V input.
  • But, what is the reason behind having a 3V3 voltage level omnipresent instead of 3V?
#2: Nominated for promotion by user avatar ArtOfCode‭ · 2021-06-27T02:04:01Z (over 3 years ago)
#1: Initial revision by user avatar 2kind‭ · 2021-02-14T08:51:59Z (over 3 years ago)
Why 3V3 instead of 3V?
Usual values used in doing electronics/power supplies are almost always round numbers:

  - 5V
  - 12V
  - 28V 
  - 48V
  - 60V

I understand that in some cases IC's are built to accept the voltage directly coming from the lithium-ion cell in order to simplify the power stage, therefore, having 4.2V input.

But, what is the reason behind having a 3V3 voltage level omnipresent instead of 3V?