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| PartNumber | SN74ALS521N | SN74ALS521NSR | SN74ALS521NS |
| Description | Logic Comparators 8-Bit Id Comparators W/open-Collector Out | Logic Comparators 8-Bit Identity. | |
| Manufacturer | Texas Instruments | Texas Instruments | KEXIN |
| Product Category | Logic Comparators | 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 | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 4.5 V | 4.5 V | - |
| Minimum Operating Temperature | 0 C | 0 C | - |
| Maximum Operating Temperature | + 70 C | + 70 C | - |
| Propagation Delay Time | 20 ns | 20 ns | - |
| Mounting Style | Through Hole | SMD/SMT | - |
| Package / Case | PDIP-20 | SO-20 | - |
| Packaging | Tube | Reel | - |
| Product | Digital Comparators | Digital Comparators | - |
| Series | SN74ALS521 | SN74ALS521 | - |
| Brand | Texas Instruments | Texas Instruments | - |
| Shutdown | No Shutdown | No Shutdown | - |
| Operating Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | - |
| Polarity | Inverting | Inverting | - |
| Product Type | Logic Comparators | Logic Comparators | - |
| Factory Pack Quantity | 20 | 2000 | - |
| Subcategory | Logic ICs | Logic ICs | - |
| Unit Weight | 0.042297 oz | 0.009408 oz | - |