SN74HCS138QDRQ1

Overview

The SN74HCS138QDRQ1 is an automotive-grade 3-line to 8-line decoder/demultiplexer from Texas Instruments, belonging to the HCS logic series. It operates within a supply voltage range of 2 V to 6 V and features a propagation delay of 54 ns. The device is housed in a SOIC-16 surface-mount package and supports installation via SMD/SMT techniques. It functions as a single circuit unit with three inputs and eight outputs. The component is qualified for AEC-Q100 standards and maintains reliable operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for reliability in vehicle environments
• Wide operating voltage capability supporting systems ranging from 2 V to 6 V
• High-temperature performance ensuring stable function up to +125°C junction temperature

Applications

• Memory address decoding in automotive electronic control units
• Data routing within high-performance vehicle communication networks
• General-purpose demultiplexing for sensor signal distribution

Procurement Notes

Verify the specific suffix 'QDRQ1' against official Texas Instruments documentation to confirm the exact package variant and automotive grade designation. Ensure compatibility with your PCB footprint for the SOIC-16 form factor. Cross-reference the datasheet revision date to validate electrical characteristics against your design requirements. Confirm that the intended application environment falls within the specified -40°C to +125°C operational limits.

Selection Notes

Select this component when designing automotive systems requiring robust 3-to-8 line decoding with wide voltage tolerance. The HCS series offers a balance of speed and power efficiency suitable for complex vehicle architectures. Consider the SOIC-16 package constraints regarding board space and thermal management. Verify that the 54 ns propagation delay meets the timing specifications of your target memory or data bus interface.

Part Context

This part belongs to the SN74HCS138 family of decoders and demultiplexers designed specifically for automotive applications. It shares functional similarities with other 3-to-8 line decoders but distinguishes itself through its HCS technology, which provides optimized performance for automotive environments. The Q1 suffix indicates its qualification for automotive use, while the DRQ1 suffix specifies the SOIC-16 package and tape-and-reel packaging configuration.

Replacement Considerations

Consult official Texas Instruments substitution guides for verified alternatives. Potential equivalents may include other SN74HCS138 variants with different package options or non-automotive grades if automotive qualification is not required.