hi, are LM324AN and LM324AN/NOPB the same material? What does NOPB mean?
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Welcome to the forum.
LM324AN/NOPB was originally designed by National Semiconductor under product page LM324-N. So it is not the same material as LM324AN under product page LM324.
NOPB means no lead. The LM324AN is also lead free, see the "Quality, reliability & packaging information" links.