SN74ALS638ANSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS638ANSR is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin TSSOP package. It features three-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides a propagation delay of 30 ns, with low-level output current capability of 24 mA and high-level output current of -15 mA. Designed for through-hole or surface-mount applications depending on variant, it supports TTL input and output levels.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture enabling bidirectional data transfer across eight channels
• Three-state outputs allowing direct connection to system buses without additional drivers
• ALS logic series performance characteristics ensuring fast switching speeds

Buffers, Drivers, Receivers, Transceivers Applications

• High-speed data acquisition systems requiring isolated bus interfaces
• Memory mapping circuits utilizing parallel data transmission
• Industrial control panels needing robust signal buffering

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'ANSR' indicates the TSSOP-20 surface mount package configuration rather than the standard PDIP variant. Confirm RoHS compliance status as manufacturing processes may update environmental certifications over time. Ensure the ordering part number matches the exact pinout and electrical specifications required by the target circuit design before finalizing procurement orders.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high-density octal data routing with minimal propagation delay. The ALS series offers a balance between power consumption and speed suitable for general-purpose digital logic applications. Consider the TSSOP package constraints regarding thermal dissipation and board space availability during layout planning.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the extensive 74ALS (Advanced Low-power Schottky) logic family produced by Texas Instruments. The 74ALS638A variant specifically addresses the need for wide-bus interfacing in legacy and modern mixed-signal environments. It serves as a critical interface element between microprocessors and peripheral devices in complex electronic architectures.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include the SN74ALS638ADW (SOIC-20 package) and SN74ALS638AN (PDIP-20 package). Verify pin compatibility and package dimensions before swapping to ensure mechanical fit within the existing PCB footprint.