MPSA05 MPSA55 MPSA06 MPSA56 MPSA42 MPSA92 SMD Equivalent is MMBTA05 MMBTA55 MMBTA06 MMBTA56 MMBTA42 MMBTA92
The transistor part number nomenclature are: JIS, Pro Electron, and JEDEC.
- IS is an acronym for Japanese Industrial Standard, and it is used in Japan,
- Pro Electron is a European standard.
- JEDEC is a North American standard developed in the United States that is also worldwide.
JEDEC is relatively user-friendly, SMD equivalent of 2N3904 is simply MMBT3904, 2N3906 is MMBT3906, and so on.
- MPSA05 (TO-92) MMBTA05 ( SOT-23 )
- MPSA55 (TO-92) MMBTA55 ( SOT-23 )
- MPSA06 (TO-92) MMBTA06 ( SOT-23 )
- MPSA56 (TO-92) MMBTA56 ( SOT-23 )
- 2N4401 (TO-92) MMBT4401 ( SOT-23 )
- 2N4403 (TO-92) MMBT4403 ( SOT-23 )
- 2N5551 (TO-92) MMBT5551 ( SOT-23 )
- 2N5401(TO-92) MMBT5401 ( SOT-23 )
- 2N3904 (TO-92) MMBT3904 ( SOT-23 )
- 2N3906 (TO-92) MMBT3906 ( SOT-23 )
- MPSA42 (TO-92) MMBTA42 ( SOT-23 )
- MPSA92 (TO-92) MMBTA92 ( SOT-23 )
Pro Electron is less user friendly, SMD equivalent of BC547 is not simply MMBT547.
a) There are some part numbers follow a system that BC8xx is an SMD version of BC5xx.
- BC546 (TO-92) BC846 ( SOT-23 )
- BC547 (TO-92) BC847 ( SOT-23 )
- BC548 (TO-92) BC848 ( SOT-23 )
- BC549 (TO-92) BC849 ( SOT-23 )
- BC556 (TO-92) BC856 ( SOT-23 )
- BC557 (TO-92) BC857 ( SOT-23 )
- BC558 (TO-92) BC858 ( SOT-23 )
- BC559 (TO-92) BC859 ( SOT-23 )
b) Some part numbers follow a system BC8_x is a SMD version of BC5_x.
- BC337 (TO-92) BC817 ( SOT-23 )
- BC338 (TO-92) BC818 ( SOT-23 )
- BC327 (TO-92) BC807 ( SOT-23 )
- BC328 (TO-92) BC808 ( SOT-23 )
IS system is a mess. Suppliers have no intent to make it systematic.
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!
Conclusion
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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