Need a LM393 with a non-inverting output.

[Hootis Tigglebits]

I have an IR detection board that I'm running 5VDC to.  When nothing is sensed the output of the LM393 is high and when something is sensed the output is low.  I need the output to be the opposite of the way it currently is.  How can I find out if there's a replacement for the LM393 in an 8-SOIC package that uses the same input pins and has a non-inverting output?  I know I could just use a NOT gate at the output, but I'd rather do this correctly.

[mawyatt]

Swap the LM393 Inputs.

Best,

[tggzzz]

Try swapping pins 2 and 3.

[Benta]

Bad design, BTW.
Both inputs to the comparator can be forced outside their operating voltage range.

[pqass]

If you can't swap the input pins 2 and 3, then the next best thing is to invert the output with a transistor (rather than a NOT gate).

Just add an NPN; existing D output to NPN base, emitter to ground, collector is your new output.  Note that his arrangement only allows you to "sink" current from the new output.  If you need to "source" current, then use a PNP instead; existing D output to PNP base (through a series 1K resistor), emitter to Vcc, collector is your new output.

You could implement either via lifiting the pin(s) and "air wiring" a transistor[+resistor].  I doubt you'll find a '393 equivalent with swapped inputs or inverted output.

See below and here for the simulator.

Note: quirk of the sink driver has the on-board LED always on.

[Hootis Tigglebits]

Thank you!