BC556 BC557 BC558 BC559 SMD Equivalent

BC556/7/8/9 SMD Equivalent is BC856/7/8/9

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!


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.

To transistor at a low price and good quality, please visit 1N4148.com

December 20, 2020

Major thankies for the blog article. Thanks Again. Great. Belinda Galvin Hillman

December 20, 2020

Regards for this marvellous post, I am glad I observed this site on yahoo. Carolee Woodie Rochkind

December 20, 2020

I got what you intend,saved to fav, very decent internet site. Freda Vincent Osmund

December 20, 2020

Way cool! Some extremely valid points! I appreciate you penning this write-up plus the rest of the website is also really good. Aubree Jephthah Constance

December 20, 2020

Thanks for sharing your thoughts. I really appreciate your efforts and I am waiting for your further write ups thank you once again. Sarina Raoul Oswin

December 20, 2020

Superior job. You ought to generate extra this kind of threads. You are great at writing. Gilberta Yuma Bast

December 23, 2020

Hi there very nice blog!! Guy .. Beautiful .. Amazing .. Lisa Prinz Noletta

December 23, 2020

Pretty! This was a really wonderful article. Thank you for providing these details. Daria Mattias Rexanna

December 24, 2020

This is my first time visit at here and i am really pleassant to read everthing at one place. Tabbie Bertram Uund

January 12, 2021

Great article! We will be linking to this great article on our site. Keep up the great writing. Jayme Gunner Horn

March 11, 2021

Here are some links to web pages that we link to because we believe they are worth visiting.

April 1, 2021

a super cool post please confirm escort my comment section thank you

Leave a comment

Stay up to date
Register now to get updates on promotions and coupons.

Shopping cart