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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  DM74LS251 | 3-STATE 1-of-8 Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 65 Kb |
| 2. | DM74LS251 | TRI-STATE Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 141 Kb |
| 3. | DM74LS251CW | 3-STATE 1-of-8 Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 65 Kb |
| 4. | DM74LS251M | 3-STATE 1-of-8 Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 65 Kb |
| 5. | DM74LS251M | TRI-STATE Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 141 Kb |
| 6. | DM74LS251MX | 3-STATE 1-of-8 Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 65 Kb |
| 7. | DM74LS251N | 3-STATE 1-of-8 Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 65 Kb |
| 8. | DM74LS251N | TRI-STATE Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 141 Kb |
| 9. | DM74LS253 | 3-STATE Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 63 Kb |
| 10. | DM74LS253 | TRI-STATE Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 153 Kb |
| 11. | DM74LS253M | 3-STATE Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 63 Kb |
| 12. | DM74LS253M | TRI-STATE Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 153 Kb |
| 13. | DM74LS253MX | Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 63 Kb |
| 14. | DM74LS253N | 3-STATE Data Selector/Multiplexer | Fairchild Semiconductor | FAIRCHILD | - | - | - | 63 Kb |
| 15. | DM74LS253N | TRI-STATE Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 153 Kb |
| 16. | DM74LS256 | Dual 4-Bit Addressable Latch | National Semiconductor | NSC | - | - | - | 133 Kb |
| 17. | DM74LS256N | Dual 4-Bit Addressable Latch | National Semiconductor | NSC | - | - | - | 133 Kb |
| 18. | DM74LS257 | TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor | NSC | - | - | - | 171 Kb |
| 19. | DM74LS257 | 3-STATE Quad 2-Data Selectors/Multiplexers | Fairchild Semiconductor | FAIRCHILD | - | - | - | 59 Kb |
| 20. | DM74LS257B | 3-STATE Quad 2-Data Selectors/Multiplexers | Fairchild Semiconductor | FAIRCHILD | - | - | - | 59 Kb |
