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Original question:

LM393A: equivalent resistance

LM393A: Pin7 to gnd impedance

Mike Yu
Intellectual 1830 points
Part Number: LM393A

Hi Team,

The customer is asking about the pin7 to GND impedance of LM393ADGKR when there is no voltage on Vcc. Could you please kindly check on this? Thank you.

Best regards,

Mike

  • 0
    TI__Guru 51396 points

    Hello Mike,

    The output should be very high impedance, 10's of meghoms, like a reversed biased diode.

    The output is the collector of a BJT transistor. With no current through on the base, the transistor will be "off".

    We do not characterize this or specify this as Vcc=0V is not a valid operating condition.

    This is also assuming that all other pins are at 0V. Voltages on other pins may cause internal leakages that could affect the actual value.

  • 0 in reply to Paul Grohe
    TI__Intellectual 1830 points

    Hi Paul,

    Got it, thanks for the support.

    Best regards,

    Mike