SN74ALS638ADWE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS638ADWE4 is an octal bus transceiver from the Texas Instruments 74ALS logic family, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5V to 5.5V and supports TTL input and output levels. The device features three-state outputs with a propagation delay of 30 ns. It provides a low-level output current of 24 mA and a high-level output current of -15 mA. Designed for through-hole or surface-mount applications, it functions within a temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional data transfer capability between two buses
• Three-state outputs for effective bus line isolation
• Inverting logic configuration for signal direction control

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module data bus interfacing
• Microprocessor system address and data routing
• Control signal distribution in industrial automation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'DWE4' against manufacturer documentation to confirm the SOIC-20 package and lead-free composition. Ensure compatibility with existing PCB footprints and reflow soldering profiles. Confirm RoHS compliance status for regulatory adherence. Check for obsolescence notices as this component may be subject to lifecycle changes. Validate electrical specifications against system requirements before integration.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal, inverting bus transceiver with ALS speed characteristics is required. The 20-SOIC package suits surface-mount designs needing compact layout. Verify that the 30 ns propagation delay meets timing constraints. Ensure the 4.5V to 5.5V operating range aligns with the system power supply. Consider the 24 mA sink current capacity for driving bus loads effectively.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments 74ALS series, known for advanced low-power Schottky technology. It serves as a standard interface solution for digital systems requiring reliable data transmission. The SN74ALS638A variant specifically provides eight channels of bidirectional transfer. It complements other logic families by offering faster switching speeds than standard LS devices while maintaining lower power consumption than AS series parts.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS638ADW is the non-green equivalent without the E4 suffix.