Diode comes with many varieties. The following presents the marking code for common SMD component for 2 pins diode component.
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.
Diode Marking Code (Commonly Used SMD Diode Component List)
| Marking Code | Package | Part Number | Alternative Part Number | Description |
| M7 | SMA-J | 1N4007 | UF1010 | power diode, 1A 1000V |
| S3M | SMC (DO-214AB) | power diode, 3A 1000V | ||
| S3X | SMC (DO-214AB) | BY1800 | power diode, 3A 1800V | |
| S3Y | SMC (DO-214AB) | BY1800 | power diode, 3A 2000V | |
| SS14 | SOD-123 | 1N5819 | CMPSH1-4 | schottky barrier diode, 1A |
| SS34 | 1N5822 | CMSH3-40MA | schottky barrier diode, 3A | |
| A6 | BAS316, BAS16 | |||
| A7 | SOT23-3 | BAV99 | ||
| A4 | SOT23-3 | BAV70 | A4W (from China) | |
| AC32 or (ES1D) | ES1D | |||
| WE C | SMAJ5.0CA | |||
| MRC | 1SMB40CAT3G | |||
| BFR | SMCJ40(C)A | |||
| K1 | MMSZ5251 | zener diode 22V | ||
| V1J | 10MQ100NPbF | diode, Schottky Rectifier | ||
| 514 S1G | S1G (SMA, DO-214AC) | surface mount glass passivated rectifier (Vishay General Semiconductor) | ||
| WJ C7 | BZT52C15 (SOD123) | 15V 5mA zener diode | ||
| A51 | (Maybe) BZX84 | ( Maybe) Voltage regulator diodes | ||
| V3J | SMC, DO-214AB | 30BQ100PbF | Schottky Rectifier, 3A | |
| F48 SS26 | SS26 | Schottky Barrier Rectifier | ||
| P451L | ??? | ??? | ||
| — | DO-35 | 1N5264B | MMSZ5264B | Zener diode |
| — | DO-204AL, DO-41 | SB140 | 1N5819 | Schottky Barrier Rectifier |
| GS1M | SMA, DO-214AC | Glass Passivated Rectifier | ||
| A20 | SMB | SMBYW02-200 | High Efficiency Fast Recovery Rectifier Diodes | |
| E1 | SOD-523F | 1N4148WT | Small Signal, Fast Switch | |
| E2 | SOD-523F | 1N4448WT | Small Signal, Fast Switch | |
| E3 | SOD-523F | 1N914BWT | Small Signal, Fast Switch | |
| E7 | SOD323 | RBS18V | E7 bi-directional zener diodes | |
| SMCJ440CA 440A 5GGHC |
SMC | 1.5KE | GJM 8A1K2 | TVS Diode |
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