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NC leads in space applications. LM158

Marti Bassas
Prodigy 20 points

Hello,

I'm using a LM158AWG/883 (may be old national component's name) for an space application.

The version I'm using is in a SOIC-10 package with 2 NC leads. I've been checking the datasheet, both the old National Semiconductor's and the TI one, and I've found no specific information concerning these NC leads.

In space applications it is normal use not to leave conductive parts completely NC, as they may take static charge because of radiation and eventually arc. Are these NC leads really not connected internally?

If so, may I connect them anywhere I want?

The easiest thing for me to do would be to short these leads with the closer ones, that is -Vcc and +IN B. Would that be OK?

One last question. Is this the right channel to get the information I'm looking for or I should have done differently?

Thanks for your help,

Kind regards,

  • 0
    TI__Guru 62930 points

    This is the correct place to ask these question.

    I was able to verify that the pins are physically not connected and are true no connects.

    They can be connected as appropriate.

    Connecting to INB will add capacitance to this pin, which possibly could impact your application.  This will depend on your application.
    Regards,

    Wade

  • 0 in reply to Wade Vonbergen
    Prodigy 20 points

    That was really a fast response.


    Thank you also for the comment concerning the parasitic capacitance added if I short InB with a NC. I could have easily missed it and eventually created a problem. I will just short the NC pad with another less sensitive track nearby.

    Have a nice day,
    Marti