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How to choose the right pin assignment for INA19x amplifiers?

Dounia Millimono
Prodigy 20 points

Hello everyone,

The INA19x current shunt monitors are available in two different pin assignments for the same package (SOT23-5).

Apart from specific PCB layout requirements, which criteria would be relevant in the selection of the right pin assignment? Is one of the pin assignments more optimized (e.g. internal bonding)?

MD

  • 0
    TI__Genius 14825 points

    MD,

    I checked the bonding diagrams for the 193 and 196, as far as I can tell there is no advantage.  There are separate bond pads used to get the wires into the right places, so one doesn't seem better than the other in terms of wire length or anything of that nature.  I also looked at the earlier revision mount and bond diagrams and they appear to have the same bond pads so I am speculating that these two package variants were planned.

    I did a little checking and found that the pinout of the INA193-INA195 matches up with the AD8211, whereas no current shunt monitor in a SOT-23-5 package I could find on newark or digikey matches the pinout of the INA196-INA198.  I'll look into this a little more with the design team and see what else I can uncover.

    Jason

  • 0
    TI__Genius 14825 points

    MD,

    I talked to a few people from the team and they informed me that one part was a single source for a customer and the other pinout part was a second source for another customer.  They are the same device so it doesn't matter which one you use.

    Jason

  • 0 in reply to Jason Bridgmon
    Prodigy 20 points

    Hi Jason,

    Thank you for your insight! I have shared this information with my colleagues.

    We will select whichever version is already in use in our past designs.

    Have a nice day,

    -- Dounia