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| 型号 | 生产日期 | 生产厂家 | 封装形式 |
| SN74LS240DW | 93 | MOT | |
| SN74LS240DBR | 2000 | TI | SSOP |
| SN74LS240AFPT | 00+ | TI | SOP20 |
| SN74LS2323P | ..` | TI | DIP-8 |
| SN74LS2323 | 00+ | DIP | |
| SN74LS22N | 85+ | MOT | DIP-14 |
| SN74LS221NS | 1998 | TI | SOP |
| SN74LS221N | 05+ | TI | DIP |
| SN74LS221N | TI | ||
| SN74LS221N | 05+ | DIP | |
| SN74LS221N | 5+ | ||
| SN74LS221N | 04+ | TI | DIP |
| SN74LS221N | 92;96 | MOT | |
| SN74LS221N | 97 | MOT | |
| SN74LS221N | MOT | ||
| SN74LS221N | |||
| SN74LS221DR2 | 2002 | ON | ON/SOP3.9 |
| SN74LS221DR | 2005 | TI | 3.9m |
| SN74LS221DR | 06+ | TI | |
| SN74LS221DBR | 02+ | TI | SSOP-16 |
| SN74LS21NSR | 0231+ | TI | SOP-16 |
| SN74LS21N(PDIP) | 2BCFJ7K | TI |
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