SN74ALS843DW

Overview

The SN74ALS843DW is a non-inverting 9-bit bus interface latch manufactured by Texas Instruments. It belongs to the ALS logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device features a propagation delay of 18 ns, with a low-level output current capability of 32 mA and a high-level output current of -2.6 mA. It consumes 67 mA of operating power and functions reliably between 0°C and +70°C. Packaged in a 24-pin SOIC format for surface mount installation.

Feature Summary

• Provides nine independent transparent latching channels for bus interface applications
• Delivers high drive strength through 32 mA low-level output current capability
• Ensures signal integrity via non-inverting logic polarity

Applications

• Parallel data storage in digital systems
• Bus interface buffering
• Temporary data holding in microprocessor interfaces

Procurement Notes

Verify component authenticity against official Texas Instruments documentation due to end-of-life status. Confirm package markings match the SN74ALS843DW identifier. Check RoHS compliance details as specified in the manufacturer datasheet. Validate that the SOIC-24 package dimensions align with design requirements before integration.

Selection Notes

Select this component when nine-channel latching is required within standard TTL voltage limits. Ensure the design accommodates the 18 ns propagation delay and 67 mA power consumption. Verify that the SOIC-24 footprint fits the PCB layout constraints. Consider the commercial temperature range suitability for the intended environment.

Part Context

This part is a member of the SN74ALS family, known for reduced power dissipation compared to standard LS logic while maintaining compatible speed. The DW suffix indicates a plastic small-outline package. As a 9-bit latch, it serves specific niche roles where odd-numbered channel counts are necessary for system architecture.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.