SOT23 is commonly known for a 3 pins SMD package and is also known as SOT23-3. There is also 5 pins package (SOT23-5), and 6 pins package (SOT23-6). The SOT package is small and normally the full part number cannot be printed on the chip itself. Normally the part number is represented by a marking code printed on top of the SOT23 package.
The follows presents some of the SOT23 components marking code, which is useful for reverse engineering use.
Warning Note: Please ensure the context of the component used in the electronic design is correct. It is possible to misinterpret the part with same marking code. This marking code reference guide is meant for your convenient. Always check the datasheet to confirm if your marking code matches the part number.
SOT23-3 Marking Code
| Marking Code | Package | Part Number | Description |
| 6B, 6B, 6C, 6D | SOT23-3 | BC817 | npn |
| J3Y | SOT23-3 | M8050 | npn |
| 1D*, 1A*, 1B*, (1BW) | SOT23-3 | BC846, BC846A, BC846B | npn |
| 1H*, 1E*, 1F*, 1G* | SOT23-3 | BC847, BC847A, BC847B, BC847C | npn |
| 1K* | SOT23-3 | BC848B | npn |
| 1GM, 1H | SOT23-3 | MMBTA06L, MMBTA05L | npn |
| J3 | SOT23-3 | S9013 | npn |
| 2TY | SOT23-3 | S8550 | pnp |
| 3BW | SOT23-3 | BC856B | pnp |
| 3D | SOT23-3 | MMBTH81 | pnp, RF transistor |
| 3G | SOT23-3 | BC857C | pnp |
| 704 | SOT23-3 | 2N7002K-D | n-ch |
| S07 | SOT23-3 | STS2307 | p-ch |
| N76 | SOT23-3 | DDTD142JU | diode |
| K7D | SOT23-3 | BAS70-04 | diode (dual) |
| A1 | SOT23-3 | BAW56 | diode (dual) |
| A4 | SOT23-3 | BAV70 or MIC803 – 31D3V |
diode (dual) or microcontroller supervisor circuit |
| A7 | SOT23-3 | BAV99 | diode (dual) |
| B6 | SOT23-3 | BAT54A BAR40AN3-0-T1-G |
dual diode |
| L05 | SOT23-3 | 78L05 or ZLLS500 |
5V voltage regulator or Schottky barrier diode |
| 65Z5 | SOT23-3 | LM6206N3 | voltage regulator |
| 6003 | SOT23-3 | MAX6003 (not sure) | voltage reference |
| 65Z5 | SOT23-3 | LM6206N3 | 3v3 regulator |
| WV4 57 | SOT23-3 | BAT54S | schottky barrier diodes |
| ANW 51 | SOT23-3 | ??? | ??? |
| W29 55, W29 41 | SOT23-3 | ??? | ??? |
| 431 | SOT23-3 | TL431 | Adjustable precision shunt regulators |
| M2A | SOT23-3 | MMBT2222A | npn |
| M7A | SOT23-3 | MMBT2907A | pnp |
SOT23-5 Marking Code
| Marking Code | Package | Part Number | Description |
| C20 | SOT23-5 | LMV7239 | comparators |
| A63A | SOT23-5 | LM321 | op-amp |
| A64A | SOT23-5 | LMH6642MF | op-amp |
| 313B | SOT23-5 | MCP6H01 | op-amp |
| SRPB | SOT23-5 | LM27313 | dc-dc |
| M5 (eg. M5YU) | SOT23-5 | 24AA16, 24LC16B-IOT | EEPROM 16K |
| =VG= | SOT23-5 | 74LVC1G32GW, 74LVC1G32GW-Q100 | 2 input OR gate |
| LPFG (maybe the same LPFL) | SOT23-5 | ??? | ??? |
| VP9V | SOT23-5 | ??? | ??? |
SOT23-6 Marking Code
| Marking Code | Package | Part Number | Description |
| ASRAE | SOT23-6 | ZXMN2B03E6 | n-ch |
| ANTAL | SOT23-6 | ZXM62P03E6 | p-ch |
| JA8K, JA8R | SOT23-6 | TS5A3159 | SPDT Analog Switch |
| AJxx, AJ6G, AJ03, AJ1M | SOT23-6 | MCP4725A0T-E/CH | digital to analog converter |
| D771 | SOT23-6 | DAC7571 | 12-bit Digital to Analog |
| 5ABK | SOT23-6 | (maybe) UM1665 | DC-DC Boost Converter |
| 58 | SOT23-6 | SI3458DV | n-ch |
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