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SN54LVCH244A: Confirm the small square orientation mark near pin 1 of SNJ54LVCH244AFK

Part Number: SN54LVCH244A

Hi Team,

Our customer would like to confirm what is the small square orientation mark near pin 1 as seen on the underside of part SNJ54LVCH244AFK below(Red encircled part):


Is the marking conductive? Is it just an indentation? Is it common to pin1, a signal pin or GND?

Thanks!

Jonathan