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OPA541: NC pins on TO220 Package

Doug Eaton
Prodigy 20 points
Part Number: OPA541


Are the NC pins on the TO220 "DO NOT CONNECT" where the are internally connected and can't be externally connected.

Specifically, can pin 6 be connected to the output at pins 5&7.

Also the tabs of two devices operating in parallel be connected together via a common heat sin, as the V- terminals are common.

  • 0
    TI__Guru* 93105 points
    Hello Doug,

    The OPA541AP NC pins 6 and 9 do not connect to anything internal to the op amp; they are electrically insulated from the other pins and the IC die. Since this is the case for pin 6 it can be connected to its adjacent pins 5 and 7 without any electrical consequences to the OPA541 operation, or circuit performance.

    The TO-220 package tab must be connected to -Vs for proper OPA541AP operation. Therefore, if you have several OPA541AP devices in the circuit they should all be connected to the common -Vs. If they are all mounted on a common heatsink, then the heatsink will need to be at the -Vs potential.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    Prodigy 20 points

    Thomas,

    Thanks! That was my assumption, but we all know what happens when we ASS U ME.

    Doug Eaton

  • 0 in reply to Doug Eaton
    TI__Guru* 93105 points
    Hi Doug,

    Glad I could help with your OPA541AP package question. It is better to ask, than to assume and get a bad surprise.

    Regards, Thomas
    Precision Amplifiers Applications Engineering