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What is it in? Alot of mass produced electronic devices use house numbers on the IC. These won't match up with a datasheet. Sometimes you can get an idea of what something is by looking at where it is in the circuit and what its pins connect to.
Why do you need to know? Do you suspect it has failed?
So that's what that means? Fernando do you have a list of those silk screen designations on a web site somewhere I could view? I know Rx or Lx Cx obviously but not much else, aside from U being an IC =)
The device is a USB film scanner (similar to the USB microscopes) and populated with 4 of these. I`m reading a short between the 2 outer legs but without a datasheet, can`t be sure of pin designation.
USB power is fed to the tab of the first one, possibly a 4.X regulator ?