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| PartNumber | DM74ALS520WMX | DM74ALS521N | DM74ALS520J |
| Description | Logic Comparators 8-Bit Comparator | Logic Comparators 8-Bit Comparator | |
| Manufacturer | ON Semiconductor | ON Semiconductor | - |
| 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 | 5.5 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 | SMD/SMT | Through Hole | - |
| Package / Case | SOIC-20 | PDIP-20 | - |
| Packaging | Reel | Tube | - |
| Product | Digital Comparators | Digital Comparators | - |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | - |
| Input Voltage Range | 2.0 V to 0.8 V | 2.0 V to 0.8 V | - |
| Operating Supply Voltage | 5 V | 5 V | - |
| Polarity | Inverting | Inverting | - |
| Product Type | Logic Comparators | Logic Comparators | - |
| Factory Pack Quantity | 1000 | 450 | - |
| Subcategory | Logic ICs | Logic ICs | - |
| Unit Weight | 0.028254 oz | 0.079719 oz | - |
| Part # Aliases | - | DM74ALS521N_NL | - |