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  • Here you can download the SMD code book that shows SMD marking codes for almost every surface-mount device available on the market. To identify a particular device, first identify the package style and note the ID code printed on the device.

    Next look up the code in the alphanumeric listing which forms the main part of the pdf book by looking for the first character in the left column. You can use the CTRL + F shortcut to search for a certain SMD code because it will be hard to look through 3400 codes, with type numbers, characteristics or equivalents and pinout information.

    Preview of the SMD Code Book

    smd marking code preview

    download the smd codebook
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    11 Responses to "SMD Code Book and Marking Codes"

    1. This is a good start, but there are many more codes out there and some are undocumented. It may take serious detective work to identify some mystery devices.

      FYI, whenever you purchase SMD semiconductors, read and document the code on your own list for personal reference. For the same generic part number, there are numerous codes as they are unique for each manufacturer and/or manufacturing location (some manufacturers have numerous facilities around the world). This will assist you in troubleshooting circuits and identifying misc. devices you may find lying around — they are so easy to lose…

      Also note that some codes may duplicate as there is no international registry like there is for JEDEC part numbers. http://en.wikipedia.org/wiki/JEDEC
      So go by both the code # and the package outline — this will help to narrow it down.

    2. This makes me mad about those ************** sitting in their offices just to make things for everybody extremely difficult Why was it impossible to standardize on numbers? Take the faithful the 741 ic There are more numbers for it than manufacturers at one time and then two or more COMPLETELY DIFFERENT DEVICES get the same number? I can never think that I am alone!

    3. Anuj Rawat says: on May 29, 2014 at 3:27 pm

      We need smd ic qoca.

    4. Anuj Rawat says: on May 29, 2014 at 3:30 pm

      this ic use in mobile adeptar so we need in actual value in smd ic QOCA. (QOCA is body mark in ic)

    5. Alfredo Perez says: on July 2, 2014 at 3:13 am

      Excellent source of information !! Thank you very much!!

    6. elektrosercen says: on January 8, 2015 at 4:56 pm

      Hi everyone i have got a defective smps circuit. I found a faulty smd diode but i dont know what it’s marking code means. the code is only B03.
      with which part I have to replace it.
      note: The diode runs above 380V
      thanks now

    7. elektrosercen says: on February 17, 2015 at 1:23 pm

      I found very useful site http://www.systek.ru/marking.php and solved own problem.

    8. mahmoud says: on March 8, 2015 at 11:21 pm

      I have a ic smd that code is ARZ8 what is the name of it?

    9. RAJESH SAINI says: on April 15, 2015 at 4:32 am

      Dear Sir

      Please find the following SMD ICs as i have not understood with marking codes :-


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