SN74ALS646A-1DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS646A-1DW is an octal bus transceiver and register featuring three-state outputs, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input and output levels. The device provides a low-level output current of 48 mA and a high-level output current of -15 mA, with a propagation delay of 9 ns. Designed for surface-mount applications, it is housed in a 24-SOIC package and functions as a non-inverting logic element.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver and register configuration
• Three-state output capability
• TTL-compatible input and output levels

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data communication on buses
• Memory interface circuits
• I/O port expansion systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

This component is officially marked as obsolete and no longer manufactured by Texas Instruments. Procurement should focus on verifying the authenticity of existing stock from authorized distributors or secondary market suppliers. Ensure that any available units are new old stock (NOS) and have been stored under appropriate conditions to prevent degradation. Cross-reference parametric equivalents if active sourcing is required for production continuity.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this part only when legacy compatibility with the 74ALS series is strictly required. Verify that the 9 ns propagation delay and specific drive currents meet the system timing and load requirements. Consider the 24-SOIC package dimensions for PCB layout constraints. Evaluate alternative active components from the SN74AS or SN74LVTH families if obsolescence poses a risk to long-term supply.

Buffers, Drivers, Receivers, Transceivers Part Context

The SN74ALS646A-1DW belongs to the Texas Instruments 74ALS (Advanced Low-power Schottky) logic family. This series was designed to offer improved speed and power consumption characteristics compared to standard 74LS devices. The device integrates eight bidirectional buffers with latching capability, serving as a foundational component in older digital design architectures requiring high-speed data transfer.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS646ADWR is listed as a parametric equivalent substitute.