SN74HCT645PWT

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT645PWT is an octal bus transceiver with 3-state outputs in a TSSOP-20 package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a temperature range of -40°C to +85°C. The device features TTL-compatible inputs, low input current of 1 µA maximum, and high-current outputs capable of driving up to 15 LSTTL loads. Typical propagation delay is 14 ns at 5.5 V with a 50 pF load, while maximum power dissipation capacitance per transceiver is 40 pF.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides asynchronous two-way communication between data buses via direction control
• Features high-current 3-state outputs for driving multiple LSTTL loads
• Ensures compatibility with TTL logic levels through specific input characteristics

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Memory-to-memory transfers
• Data buffering and bus-oriented communications

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the exact ordering suffix 'PWT' corresponds to the TSSOP-20 package with a 250-unit tube quantity as specified in the official documentation. Confirm that the component status is listed as active production and check for any recent package or material updates in the latest Package Option Addendum before finalizing procurement specifications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring bidirectional data transfer between buses operating at standard 5 V logic levels. Ensure the application environment remains within the specified -40°C to +85°C temperature range. Verify that the required drive current does not exceed the 6 mA output capability at 5 V and that the PCB layout accommodates the TSSOP-20 footprint dimensions.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74HCT645 family of octal bus transceivers manufactured by Texas Instruments. It is designed for use in digital logic circuits where reliable data transmission between different bus structures is necessary. The HCT series ensures compatibility with standard TTL logic families while utilizing CMOS technology for lower power consumption compared to older logic standards.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include other SN74HCT645 variants such as SN74HCT645N (PDIP), SN74HCT645DW (SOIC), and SN74HCT645DWR (SOIC Reel). When replacing, ensure the new variant maintains the same TSSOP-20 pinout if board space is constrained, or verify that the existing footprint can accommodate alternative package types like SOIC or PDIP.