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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  74LS257 | LOW POWER SCHOTTKY | ON Semiconductor | ONSEMI | - | - | - | 129 Kb |
| 2. | 74LS257 | QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS | Texas Instruments | TI | - | - | - | 660 Kb |
| 3. | 74LS257 | 3-STATE Quad 2-Data Selectors/Multiplexers | Fairchild Semiconductor | FAIRCHILD | - | - | - | 59 Kb |
| 4. | 74LS257 | TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 171 Kb |
| 5. | 74LS257 | Quadruple 2-line-to-1-line Data Selectors/Multiplexers(with non inverted 3-state outputs) | Hitachi Semiconductor | HITACHI | - | - | - | 73 Kb |
| 6. | 54LS257 | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS | Motorola, Inc | MOTOROLA | - | - | - | 189 Kb |
| 7. | 54LS257 | TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 171 Kb |
| 8. | 54LS257 | QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS | Texas Instruments | TI | - | - | - | 660 Kb |
| 9. | 74ALS257 | Data selector/multiplexer | NXP Semiconductors | PHILIPS | - | - | - | 143 Kb |
| 10. | DM74LS257 | TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 171 Kb |
| 11. | DM74LS257 | 3-STATE Quad 2-Data Selectors/Multiplexers | Fairchild Semiconductor | FAIRCHILD | - | - | - | 59 Kb |
| 12. | HD74LS257 | Quadruple 2-line-to-1-line Data Selectors/Multiplexers(with non inverted 3-state outputs) | Hitachi Semiconductor | HITACHI | - | - | - | 73 Kb |
| 13. | SN54LS257 | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS | Motorola, Inc | MOTOROLA | - | - | - | 189 Kb |
| 14. | SN54LS257 | QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS | Texas Instruments | TI | - | - | - | 660 Kb |
| 15. | SN74LS257 | LOW POWER SCHOTTKY | ON Semiconductor | ONSEMI | - | - | - | 129 Kb |
| 16. | SN74LS257 | QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS | Texas Instruments | TI | - | - | - | 660 Kb |
| 17. | HD74LS257 | Ouadruple 2-input Positive NAND Gates | Hitachi Semiconductor | HITACHI | - | - | - | 5.74 Mb |
| 18. | HD74LS257 | Quadruple 2-line-to-1-line Data Selectors / Multiplexers (with not inverted 3-state outputs) | Renesas Technology Corp | RENESAS | - | - | - | 79 Kb |
| 19. | DM74ALS257 | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 81 Kb |
| 20. | 54LS257A | TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 171 Kb |
