STMicro TSX339IQ4 Vcm, as drop-in for TI LM339LVRTE?

[RescueBlues]

I'm looking at this ST Micro part
   ST MICROELECTRONICS TSX339IQ4 --- power from 2.7V to 16V.
         But Vicm limitation of Vcc - 2V. At 3.3V-2V = 1.3V.
          But need Vcm at 2.5V., so 2.5V + 2V = 4.5V, so likely Vcc = 5V.

as an alternative source to this TI part:
    TEXAS INSTRUMENTS LM339LVRTE -- power from 1.65V to 5.5V. Vcm from 0 to Vcc.

I'd like to power the IC off of 3.3V and don't have a convenient source of 5V. And I *must* use a Vref of 2.5V given the other I/O requirements.

Unfortunately although the TI part will work at 3.3V with Vref of 2.5V (since its allows Vcm is 0-Vcc), the ST Micro part won't work that way. It's Vcm is limited to Vcc - 2V = 3.3V-2V = 1.3V, 1.2V *below* the required Vref of 2.5V. To allow the ST Micro part to work at 2.5V, it would require a Vcc of 2.5V+2V = 4.5V => 5V. Both the ST Micro & TI would be OK at Vcc=5V *but* I don't have a source of 5V on this design or way to distribute it to the *many* comparators used.

Any suggestions, or alternate parts that are footprint equivalent for ST Micro vs. TI vs. ???

[Peter BENSCH]

Welcome @RescueBlues, to the community!

If you are working with 3.3V and need low current consumption you could use the TS884 instead.

Hope it helps?

Good luck!
/Peter

[RescueBlues]

Thanks, good idea.

I was comparing the ST Micro TS884IQ4T to the TEXAS INSTRUMENTS LM339LVRTE. Similar specs, rail-to-rail Vicm, same QFN16 package. 

SOOOO Close, but...  I then noticed that the pinouts for the two are different (e.g. TI part has all their OUTs 1-4 on one side, but the ST Micro mixed INs & OUTs on two sides. Then a few diffs for VCC, GND, etc.). Too bad. I'd have to pick one xor the other and can't put the two on the same AML.

[Peter BENSCH]

If you can't or don't want to use the TS884IQ4T, I'm sorry and you have to use the other device, because STMicroelectronics has no alternative with this pin assignment in a QFN16.

Good luck!
/Peter