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Welcome to the SMD marking codes pages.
Because of their size, SMD devices cannot carry conventional semiconductor codes. So each manufacturer
gives their products an individual code. These SMD Marking Codes usually consist of two or three digits /
letters.
This fact alone can make the device identification a real headache for third party repair organizations.
The above linked pages contain reference to just under 10,000 devices making it the number one site on the
web for SMD marking codes. The data is as accurate as possible, however I am only human and may have made some mistakes (typo's etc) so
If you spot something that you are not sure about please email me at the address on the index page and I
will be only too glad to check it for you.
If you cannot see the links then you will need to enable java as they are writen in javascript.
To identify a particular SMD device, first identify the package style and note the SMD marking codes printed on
the device.
It can also help if you have a device with the same packaging and SMD marking codes as you can do a CT check on the
good device to tell you a bit about the device type you are looking for. For example there are five
devices marked 02, but if you know the device you are looking for is in a SOT23 package you can look it
up on page 0 and locate the device BSX39.
Be warned though, even the same manufacturer may use the same code for different devices, this is where a CT check or transistor test can ultimately be decisive in part choice.
Lastly, a big thank you to all those who have contributed to these pages especially G4PMK without who's help I might never have started this part of my site.
Melf Diodes Below is a diagram of a MELF package, mini MELF (SOD80) also known as LL-34 or DO-213AA. The larger MELF package is
also known as SM1, LL-41 or DO-213AB. Dimensions are for indication purposes only as they will vary slightly
from manufacturer to manufacturer.
MELFs (Metal Electrode Leadless Face) have metallised terminals at each end of a
cylindrical body and are designed to fit the same footprints as flat components i.e.: 0805
(.08" x .05") and the 0603 (.06" x .03").
(MELF/SOD-80) Colour banded types
Cathode Diode type : Colour Band. Black BAS32, BAS45, BA682, BA683, BAV105, LL4148, LL4150, LL4151, LL4153, LL4448, BB241, BB249 Black Brown LL4148, LL914 Black Orange LL4150, BB219 Brown Green LL300 Brown Black LL4448 Red BA682 Red Orange BA683 Red Green BA423L Red White LL600 Orange Yellow LL3595 Yellow BZV55, BZV80, BZV81 (zeners) Green BAV105, BB240 Green Black BAV100 Green Brown BAV101 Green Red BAV102 Green Orange BAV103 Gray BAS81, BAS82, BAS83, BAS85, BAS86 White BB219 White Green BB215
Vishay/General Semiconductor Mini-MELF diodes
CATHODE Mini MELF Device Type BAND Black General purpose Yellow Switching Green Schottky Blue Zener
CATHODE MELF Device Type BAND Black Zener Green Schottky
SMD marking codes