| 型号 | 厂家 | 封装 | 批号 |
| MCP2557FD-H/SN | Microch | SOP8 | 22+ |
| MAX521BCWG+ | Maxim | 24-SOIC | 22+ |
| MAX521AEWG+ | Maxim | 24-SOIC | 22+ |
| MAX521AEPP+ | Maxim | 20-DIP | 22+ |
| MAX521BCPP+ | Maxim | 20-DIP | 22+ |
| MAX521BEWG+T | Maxim | 24-SOIC | 22+ |
| MAX521BEWG+ | Maxim | 24-SOIC | 22+ |
| MAX521BEPP+ | Maxim | 20-DIP | 22+ |
| MAX521ACPP+ | Maxim | 20-DIP | 22+ |
| MAX521ACWG+ | Maxim | 24-SOIC | 22+ |
