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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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    15 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. We need smd ic qoca.

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

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

    9. Dear Sir

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


    10. I guess your package ID adjacent row ie CB+AY or CBA+Y, CBQ+D or CB+QD
      here is the text for your knowlodge maybe give you an idea

    11. Code
      CB- RT8058PQW RT8058 WQFN-3×3-16L 1MHz, 2A, High Efficiency PWM Step-Down DC/DC Converter
      CB- RT9013A-18PU5 RT9013A SC-70-5 120mA, Low Dropout, Low Noise Ultra-Fast Without Bypass Capacitor CMOS LDO Regulator
      CB- RT9167A-50PB RT9167A SOT-23-5 Low-Noise, Fixed Output Voltage,500mA LDO Regulator
      CB- RT9169-15PVL RT9169 SOT-23-3 100mA, 4uA Quiescent Current CMOS LDO Regulator
      CBxx RN5RT41AA SOT-23-5 4.1V LDO Voltage Regulator
      CBxx APE8862U5-12 APE8862 SC-70-5L 1.2V 0.6A Low Dropout Positive Regulator
      CBxx AX6901BR AX6901 SOT23-3 4.38V Microprocessor Reset Circuit
      CBxx IMP1811R-10 IMP1811 SOT-23 4.35V Low Power, 5V uP Reset
      CBxx MAX6314US37D1 MAX6314 SOT143 3.70V 1ms 68HC11/Bidirectional-Compatible uP Reset Circuit
      CBxx MCP3421A1T-E/CH MCP3421 SOT-23-6 18-Bit ADC with I2C Interface and Onboard Reference
      CBxx TC1017-1.9VLT TC1017 SC-70-5 150 mA, Tiny CMOS LDO With Shutdown
      CBxx TC1017-1.9VLTTR TC1017 SC-70-5 150 mA, Tiny CMOS LDO With Shutdown
      CBxx TCM829ECT TCM829 SOT-23-5 Switched Capacitor Voltage Converter
      CB% TL431IDBZR TL431 SOT23 Adjustable precision shunt regulator
      CB+xx ALT10023TR TO-243AA NPN 120V 1.5A Transistor
      CB+xx RP130Q311A RP130Q SC-82AB 3.1V LOW NOISE 150mA LDO REGULATOR
      CB+xx RP152N002A RP152N SOT-23-6 150 mA 1.8V+2.8V Dual LDO Regulator with Sequence Control

      CBA SN74LVC1G06MDCKREP SN74LVC1G06-EP SC-70-5 Enhanced Product Single Inverter Buffer/Driver With Open-Drain Output
      CBAx NCS2200SQ2T2 NCS2200 SC70-5 Low Voltage Comparator
      CBQ 2SC4132 MPT3 Power NPN Transistor (120V, 1.5A)
      CBQ SMBJ100CA-TR SMB 100V 600W Bidirectional TRANSIL
      CBQ TPS62243DRV TPS62243 R-PUSON-R6 2.25MHz 300mA Step-Down Converter
      CBQxx RP106N181D5 RP106N SOT-23-5 1.85V 0.8% ACCURACY 400mA LDO REGULATOR

      QD CPH5803 CPH5 N-Channel Silicon MOSFET and Schottky Barrier Diode
      QD MCH5804 MCPH5 P-Channel Silicon MOSFET and Schottky Barrier Diode
      QD QDL3 SOT-223 Snubber Damping Rectifier
      QD QDM3 SOT-89 Snubber Damping Rectifier
      QD R1114Q331B SC-82AB 150mA LDO Ultra-Low noise voltage regulator
      QD RN1324A 2-2E1A Silicon NPN Epitaxial Transistor with Resistor
      QD RN1424 2-3F1A Silicon NPN Epitaxial Transistor with Resistors
      QD BD5323FVE-TR BD5323FVE VSOF5 Voltage Detector with Adjustable Delay Time
      QD BD5323G-TR BD5323G SSOP5 Voltage Detector with Adjustable Delay Time
      Qd BD53E32G-MTR BD53E32G-M SSOP5 Voltage Detector with Adjustable Delay Time
      Qd BD53E32G-TR BD53E32G SSOP5 Voltage Detector with Adjustable Delay Time

      Y+5209 MIC5209YML MIC5209 MLF3x3-8 500mA Low-Noise LDO Voltage Regulator
      Y+xxx VS-FCSP0730TR FCSP0730 FlipKY-0.75 Chip Scale Package Schottky Barrier Rectifier, 0.75 A

    12. What is the code of smd resistance “tk” for LCD.

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