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OPA561 thermal pad (PowerPAD) connection

Shinichi Yokota
Genius 9715 points
Other Parts Discussed in Thread: OPA561

Hello, team.

My customer has strong concern about connection of thermal pad (PowerPAD) of OPA561. These are some descriptions on this on data sheet, but those don't agree. Could you help us deal with it?

  • Question: What voltage must the thermal pad be connected?

Descriptions that disagree:

  • Page 1: HTSSOP-20
    • NOTE: ... Flag must be connected to V-.
  • Page 10: AMPLIFIER MOUNTING
    • In addition, through the use of thermal vias, the thermal pad can be directly connected to a ground plane or special heatsink structure designed into the PCB. (Left column on the page)
    • The PowerPAD must be connected to the most negative supply of the device. (Right column on the page)
  • 0
    TI__Expert 7185 points

    Yokota-san,

    I agree that the wording in this data sheet is somewhat misleading.  The answer to your question is that the OPA561 flag pin should be electrically connected to most negative supply (V-).  This is to prevent a mismatch in substrate bias that can lead to performance issues or even damage to the device.

    We will fix this discrepancy in the data sheet to avoid confusion in the future.

    Thanks,

    Matt