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LM358: Why is the marking LM1580 printed on the internal DIE?

Part Number: LM358
Other Parts Discussed in Thread: LM158-N, , , LM158


After the part of LM358MX/NOPB is uncovered, it is found that LM1580 is printed on the die.

Pls help to checck the difference from part number and die marking.

Thank you.