| PartNumber | 74ACTQ646SC | 74ACTQ657SC | 74ACTQ646SCX |
| Description | Bus Transceivers Octal Trans/Reg | Bus Transceivers Octal Bidir Trans | Bus Transceivers Octal Trans/Reg |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | Bus Transceivers | Bus Transceivers | Bus Transceivers |
| RoHS | Y | Y | Y |
| Logic Family | 74ACT | 74ACT | 74ACT |
| Input Level | TTL | TTL | TTL |
| Output Level | CMOS | CMOS | CMOS |
| Output Type | 3-State | 3-State | 3-State |
| High Level Output Current | - 24 mA | - 24 mA | - 24 mA |
| Low Level Output Current | 24 mA | 24 mA | 24 mA |
| Propagation Delay Time | 10.5 ns | 8 ns | 10.5 ns |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 4.5 V | 4.5 V | 4.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Package / Case | SOIC-24 | SOIC-24 | SOIC-24 |
| Packaging | Tube | Tube | Reel |
| Function | Wide Octal Transceiver / Register | Wide Octal Bidirectional Transceiver | Wide Octal Transceiver / Register |
| Height | 2.35 mm | 2.35 mm | 2.35 mm |
| Length | 15.4 mm | 15.4 mm | 15.4 mm |
| Number of Circuits | 8 | 8 | 8 |
| Product | CMOS | CMOS | CMOS |
| Technology | CMOS | CMOS | CMOS |
| Width | 7.5 mm | 7.5 mm | 7.5 mm |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Number of Channels | 8 | 8 | 8 |
| Supply Current Max | 8 uA | 8 uA | 8 uA |
| Operating Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Polarity | Non-Inverting | Non-Inverting | Non-Inverting |
| Product Type | Bus Transceivers | Bus Transceivers | Bus Transceivers |
| Factory Pack Quantity | 30 | 900 | 1000 |
| Subcategory | Logic ICs | Logic ICs | Logic ICs |
| Triggering Type | Positive Edge | - | Positive Edge |
| Part # Aliases | 74ACTQ646SC_NL | 74ACTQ657SC_NL | - |
| Unit Weight | 0.038731 oz | 0.038731 oz | 0.038731 oz |
| Pd Power Dissipation | - | 160 mW | - |