LM339B: 0V Supply use case (LM339B and LM393B)

Shinya Sawamoto

Part Number: LM339B
Other Parts Discussed in Thread: LM393B, LM339

Hello team,

I have a quick question.

Is the input voltage under the ABS max allowed to be biased regardless of the supply voltage condition for LM339B and LM393B?
(e.g. Vin=32V with Vcc=0V)

Thanks in advance.
Sawamoto

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 260250 points

Yes; see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

+1 Paul Grohe over 1 year ago

TI__Guru 51606 points

Hello Shinya,

Yes. You may apply up to 36V to the inputs and/or output without damage, even with the supply voltage at 0V.

Obviously, the output condition is not correct (it will be high).

For more info, see the LM339 family appnote:

Application Design Guidelines for LM339, LM393, TL331 Family Comparators

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LM339B: 0V Supply use case (LM339B and LM393B)