SN74HCT645DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT645DW is an octal bus transceiver in the HCT logic series, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature from -40°C to +85°C. The device features high-current 3-state outputs capable of driving up to 15 LSTTL loads, with ±6-mA output drive at 5 V. Typical propagation delay is 14 ns, and maximum static power consumption is 80 µA.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides asynchronous two-way communication between data buses via direction control
• Features TTL-voltage compatible inputs for direct interfacing with TTL logic
• Includes output-enable functionality to isolate buses when disabled

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way data bus communication
• Driving LSTTL loads on system buses
• Bus isolation applications requiring controlled signal flow

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum. Confirm that the component status matches project requirements, as the tube version may be obsolete while the reel version remains active. Ensure the lead finish and moisture sensitivity level align with assembly processes.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when TTL-compatible input thresholds are required alongside CMOS performance. The HCT series ensures compatibility with standard TTL logic levels. Verify that the 20-pin SOIC package dimensions fit the available PCB footprint and that the thermal impedance meets the design's heat dissipation constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74HCT645 family of octal bus transceivers. It shares functional characteristics with other variants in the series but differs in packaging and manufacturing status. The DW suffix specifically denotes the SOIC surface-mount package configuration.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HCT645DWR is the active reel version of the same device. SN74HC645DWR is a HC-series alternative with different voltage ranges.