| 型号 | 厂家 | 封装 | 批号 |
| 25C640-I/ST | Microchip | TSSOP-8 | 22+ |
| 25C640/P | Microchip | DIP-8 | 22+ |
| 25C640T-E/ST | Microchip | TSSOP-8 | 22+ |
| 25C640-E/SN | Microchip | SOP-8 | 22+ |
| 25C640T-E/SN | Microchip | SOP-8 | 22+ |
| 25C640T-I/SN | Microchip | SOP-8 | 22+ |
| 25C640/ST | Microchip | TSSOP-8 | 22+ |
| 25C640-E/P | Microchip | DIP-8 | 22+ |
| 25C640-I/P | Microchip | DIP-8 | 22+ |
| 25C640T/SN | Microchip | SOP-8 | 22+ |
