Try to find the manufacturer marking or Logo.
I know, Identifying the manufacturers' type number of an SMD device from the package code can be a difficult task, involving combing through many different databooks.
(Unfortunately, each device code is not necessarily unique.
For example a device coded 1A might be either a BC846A or a FMMT3904.
Even the same manufacturer may use the same code for different devices!)
Or try the SMD Marking Code Databook.
(more than 1000 pages with 76.000 Marking codes, Case drawings, Pinouts and schematics)
Info and databook can be found at www.TKB-4u.com