I need the datasheet of an SMD component, on which I can read
74YH
S21B
The chip is about 3mm x 3mm and, given its position on the board, has likely something to do with voltage regulation (but I can't be 100% sure).
It has 8 leads.
Please see the attached picture if that helps.
I have already explored the component-identification procedures proposed in the following post:
How do I identify SMD components? (or how do I identify any component)
but nothing clear came out (at best, hundreds of potential results…).
Best Answer
Probably an LM3488, a DC/DC converter controller IC; those are marked S21B. The top line of the markings varies.
Not entirely sure, though.