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OPA2333-HT: Die orientation marking

Part Number: OPA2333-HT

Hi all,

the bond pad arrangement for the OPA2333-ht is almost completely symetrical and the datasheet drawing is a bit vague hence we are having issues confirming which way around to place it. I notice there is an ident number IC05018 in one corner other than that there does not seam to be any other indication.

Is this the PAD 1 mark? If it is it would read upside down. If it is not does anyone have a drawing that would detrming orientation repeatably.

Thanks in advance