Is there any difference between NE555N and NE555P integrated circuits? The pinout is the same? are they only not difference of date sheet ?NE555N date sheetNE555P date sheet
N is general purpose.
P is precision.
To be honest for most hobbyists and applications, the little difference or cost doesn't matter.
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Check with the actual chip makers site, I never trust third party sites for primary references.
As with transistors: N for negative signals, P for positive signals.