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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  74ACT520 | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 2. | 74ACT520 | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 278 Kb |
| 3. | 74ACT520CW | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 4. | 74ACT520PC | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 5. | 74ACT520PC | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 278 Kb |
| 6. | 74ACT520SC | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 7. | 74ACT520SC | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 278 Kb |
| 8. | 74ACT520SCX | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 9. | 74ACT520SJ | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 10. | 74ACT520SJ | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 278 Kb |
| 11. | 74ACT520SJX | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 12. | 74ACT521 | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 119 Kb |
| 13. | MC74ACT521 | 8-BIT IDENTITY COMPARATOR | Motorola, Inc | MOTOROLA | - | - | - | 187 Kb |
| 14. | 74ACT521CW | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 15. | MC74ACT521DW | 8-BIT IDENTITY COMPARATOR | Motorola, Inc | MOTOROLA | - | - | - | 187 Kb |
| 16. | TC74ACT521F | CMOS Digital Integrated Circuit Silicon Monolithic 8-Bit Equality Comparator | Toshiba Semiconductor | TOSHIBA | - | - | - | 282 Kb |
| 17. | 74ACT521MTC | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 119 Kb |
| 18. | 74ACT521MTCX | 8-Bit Identity Comparator | Fairchild Semiconductor | FAIRCHILD | - | - | - | 86 Kb |
| 19. | MC74ACT521N | 8-BIT IDENTITY COMPARATOR | Motorola, Inc | MOTOROLA | - | - | - | 187 Kb |
| 20. | TC74ACT521P | CMOS Digital Integrated Circuit Silicon Monolithic 8-Bit Equality Comparator | Toshiba Semiconductor | TOSHIBA | - | - | - | 282 Kb |
