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ISOW7841: Chip marking description please

Part Number: ISOW7841
Other Parts Discussed in Thread: ISOW7842

Hi,

Is there any literature available to identify the prefix text on ISOW7841 and ISOW7842 chips?

I have multiple reels of both and wish to determine what this text means

The markings on the ISOW7841 are

First reel

26ADFGT

ISOW7841

G4

Second reel

13CGRKT

ISOW7841

G4

The markings on the ISOW7842 are

First reel

21CEXKT

ISOW7842

G4

Second reel

08CJSJT

ISOW7842

G4

I would like to determine what the text in bold means please.

Thanks in advance.