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LM139AQML: Asking for additional information about a product

Nataniel Maggiora
Prodigy 10 points
Part Number: LM139AQML
Other Parts Discussed in Thread: LM339

To whom it may concern.

Here at INVAP SE, we are designing electronics circuits for Satellite aplications, and in this particular case we would need additional information on this component.

We want to know if this component can be used by aplying voltage to the inputs (Pins 4 to 11) while there is no voltage aplied on the source Pins (Pin 3 = 0V = GND). Looking at the attached datasheet there is no concrete info for this issue, so if you could send us this info we would most appreciate it.

Looking foward to your reply.

Sincerely.

Nataniel Maggiora

  • 0
    TI__Guru 53666 points

    Hello Nataniel,

    In short, yes. You may apply up to 36V on the input pins, even when the supply voltage is 0V.

    Obviously, the device will not be functional and the output will not be correct (high), but it will not be damaged.

    We recommend placing current limiting resistors (a few kohms)  in series with the inputs to prevent any possible latch-up due to transients. If there is a chance any of the pins could be pulled below below GND, then external clamping diodes are recommended.

    For more info, please see the LM339 family appnote, section 2.5:

     Application Design Guidelines for LM339, LM393, TL331 Family Comparators

    Regards,

    Paul Grohe