稳压二极管也称为 齐纳二极管，是一种利用二极管反向击穿特性进行稳压的电子元件。当反向电压达到或超过其击穿电压（齐纳电压）时，稳压管会进入击穿状态，并维持一个相对稳定的电压输出。这个稳定的电压值被称为稳压值，广泛应用于稳压电源和限幅电路中。
| 型号 | 制造商 | 封装 | PD_Max/W | VZ_Min/V | VZ_Max/V | @ IZT/mA | ZZT_Max/Ω | IR_Max/μA |
|---|---|---|---|---|---|---|---|---|
| MMSZ5256B | LEADSILICON | SOD-123 | 0.5 | 28.5 | 31.5 | 4.2 | 0.1 | |
| MMSZ5257B | LEADSILICON | SOD-123 | 0.5 | 31.35 | 34.65 | 3.8 | 0.1 | |
| MMSZ5258B | LEADSILICON | SOD-123 | 0.5 | 34.2 | 37.8 | 3.4 | 0.1 | |
| MMSZ5259B | LEADSILICON | SOD-123 | 0.5 | 37.05 | 40.95 | 3.2 | 0.1 | |
| MMSZ5231C | LEADSILICON | SOD-123 | 0.5 | 5 | 5.2 | 20 | 5 | |
| MMSZ5232C | LEADSILICON | SOD-123 | 0.5 | 5.49 | 5.71 | 20 | 5 | |
| MMSZ5233C | LEADSILICON | SOD-123 | 0.5 | 5.88 | 6.12 | 20 | 5 | |
| MMSZ5234C | LEADSILICON | SOD-123 | 0.5 | 6.08 | 6.32 | 20 | 5 | |
| MMSZ5235C | LEADSILICON | SOD-123 | 0.5 | 6.66 | 6.94 | 20 | 3 | |
| MMSZ5236C | LEADSILICON | SOD-123 | 0.5 | 7.35 | 7.65 | 20 | 3 | |
| MMSZ5237C | LEADSILICON | SOD-123 | 0.5 | 8.04 | 8.36 | 20 | 3 | |
| MMSZ5238C | LEADSILICON | SOD-123 | 0.5 | 8.53 | 8.87 | 20 | 3 | |
| MMSZ5239C | LEADSILICON | SOD-123 | 0.5 | 8.92 | 9.28 | 20 | 3 | |
| MMSZ5240C | LEADSILICON | SOD-123 | 0.5 | 9.8 | 10.2 | 20 | 3 | |
| MMSZ5241C | LEADSILICON | SOD-123 | 0.5 | 10.78 | 11.22 | 20 | 2 | |
| MMSZ5242C | LEADSILICON | SOD-123 | 0.5 | 11.76 | 12.24 | 20 | 1 | |
| MMSZ5243C | LEADSILICON | SOD-123 | 0.5 | 12.74 | 13.26 | 9.5 | 0.5 | |
| MMSZ5244C | LEADSILICON | SOD-123 | 0.5 | 13.72 | 14.28 | 9 | 0.1 | |
| MMSZ5245C | LEADSILICON | SOD-123 | 0.5 | 14.7 | 15.3 | 8.5 | 0.1 | |
| MMSZ5246C | LEADSILICON | SOD-123 | 0.5 | 15.68 | 16.32 | 7.8 | 0.1 |