| PartNumber | DM74ALS521WM | DM74ALS521N | DM74ALS521WMX |
| Description | Logic Comparators 8-Bit Comparator | Logic Comparators 8-Bit Comparator | IC COMPARATOR IDENTITY 8B 20SOIC |
| Manufacturer | ON Semiconductor | ON Semiconductor | Fairchild Semiconductor |
| Product Category | Logic Comparators | Logic Comparators | IC Chips |
| RoHS | Y | Y | - |
| Comparator Type | Identity | Identity | - |
| Number of Bits | 8 bit | 8 bit | 8 |
| 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 | Tube | Tube | Tape & Reel (TR) |
| 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 | 1080 | 450 | - |
| Subcategory | Logic ICs | Logic ICs | - |
| Unit Weight | 0.028254 oz | 0.079719 oz | - |
| Part # Aliases | - | DM74ALS521N_NL | - |
| Series | - | - | 74ALS |
| Type | - | - | Identity Comparator |
| Package Case | - | - | 20-SOIC (0.295", 7.50mm Width) |
| Operating Temperature | - | - | 0°C ~ 70°C |
| Mounting Type | - | - | Surface Mount |
| Voltage Supply | - | - | 4.5 V ~ 5.5 V |
| Output | - | - | Active Low |
| Output Function | - | - | A=B |
| Current Output High Low | - | - | 2.6mA, 24mA |
| Max Propagation Delay V Max CL | - | - | 20ns @ 5V, 50pF |
| Current Quiescent | - | - | - |