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LM393: Operating at 3.3V

Part Number: LM393
Other Parts Discussed in Thread: TLV1701, LMC6772, LMV393

Hi all,

I have referred the LM393 data sheet. And I am in need of few clarifications;

I am employing LM393 as a comparator in a speed sensor application

Q1. Data sheet mentions a wide VCC range but under section "8.2.1 Design Requirement" the range specified is 4.5V to VCC maximum. So is it advisable to operate LM393 with a 3.3V supply?

Q2. Best suitable alternative to LM393 comparator suitable for VCC=3.3V?

Thanks!

  • Hello Swaroop,

    The "8.2.1 Design Requirement" section is describing the desired conditions for the test circuit, not the device.It is not a device specification.

    The LM393 will work just fine at 3.3V. But you must be aware of the input limitations due to the Common Mode Range (page 7).

    The maximum input voltage is limited to 2V below V+, or 1.3V for a 3.3V supply. As long as your input voltages are below 1.3V, the LM393 will work just fine.

    There are many devices that can replace the LM393. If you need more input voltage range, try the LMV393 (2.5V in max), or the TLV1701 or LMC6772 for the full (rail to rail) 3.3V input range.