• TI Thinks Resolved

LM2903: LM2903 unused channel

Part Number: LM2903

Hi Team,

My customer's product is going to mass production; there has an unused LM2903 channel on the board. they left the inverting-input, non-inverting input & output pins open.

I referred to this E2E answer, but didn't find the situation above.

So It's OK to left all the pins of the unused channel open? what will be the risk?


Best regards,


  • Hi Yang,

    while the output need not to be connected to anything, it's not wise to leave the input pins unconnected.

    Ron wrote:

    "Connect one input to GND/VCC- pin through series resistance and the other to VCC thorugh a series resistance. This gives a known and stable output that is not used."

    I think this method can be used in your application. Use a 10k resistor for each connection.

  • In reply to kai klaas69:

    Hi Kai,

    Thanks for your reply. that's also my solution. while the problem is that customer can't modify it because it's going to mass production...

    Best regards,