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| PartNumber | 74FCT521ATQG | 74FCT521ATQG8 | 74FCT521ATF |
| Description | Logic Comparators 8-Bit Identity Comparator | Logic Comparators 8-Bit Identity Comparator | |
| Manufacturer | IDT (Integrated Device Technology) | IDT (Integrated Device Technology) | - |
| Product Category | Logic Comparators | Logic Comparators | - |
| RoHS | Y | Y | - |
| Comparator Type | Identity | Identity | - |
| Number of Bits | 8 bit | 8 bit | - |
| Logic Function | A = B | A = B | - |
| Output Type | Active Low | Active Low | - |
| Supply Voltage Max | 5.25 V | 5.25 V | - |
| Supply Voltage Min | 4.75 V | 4.75 V | - |
| Supply Current Max | 4.5 mA | 4.5 mA | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Propagation Delay Time | 7.2 ns | 7.2 ns | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | QSOP-20 | QSOP-20 | - |
| Packaging | Tube | Reel | - |
| Height | 1.47 mm | 1.47 mm | - |
| Length | 8.7 mm | 8.7 mm | - |
| Product | Digital Comparators | Digital Comparators | - |
| Series | 74FCT521T | 74FCT521T | - |
| Width | 3.8 mm | 3.8 mm | - |
| Brand | IDT | IDT | - |
| High Level Output Current | 15 mA | 15 mA | - |
| Low Level Output Current | 48 mA | 48 mA | - |
| Product Type | Logic Comparators | Logic Comparators | - |
| Factory Pack Quantity | 55 | 3000 | - |
| Subcategory | Logic ICs | Logic ICs | - |
| Part # Aliases | 74FCT521T IDT74FCT521ATQG | 74FCT521T IDT74FCT521ATQG8 | - |
| Unit Weight | 0.008508 oz | 0.008508 oz | - |