2N3904/3906 2N4401/4403 2N5401/5551 SMD Equivalent is MMBT3904/3906 MMBT4401/4403 MMBT5401/5551
a) There are some part numbers follow a system that BC8xx is an SMD version of BC5xx.
b) Some part numbers follow a system BC8_x is a SMD version of BC5_x.
Some cross-reference suggests that the SMD versions of the 2SC1815 are available as the 2SC2712 (SOT-23), 2SC4738 (SOT-23), KTC3875 (SOT-23) and KTC3875S (SOT-23).
You have to compare the specifications in detail. Good luck!
Understanding the transistor nomenclature system will help you find the SMD version of a transistor much easier and much accurate.
The author was the global business manager of the Discrete division of National Semiconductor in Silicon Valley in the late ’80s.
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