Very useful resource page for surface mount technology.
Page last updated a few days ago.
Includes 11 page primer for beginners (PDF format)

Links list has a ref to a superb list (1000+ items) of SMD device codes

eg  "4Ap" on a SOT23 device may well mean that it is a   BC859a


        http://www.geocities.com/vk3em/smtguide/smtguide.htm

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