SN74HCS238QDYYRQ1

Overview

The SN74HCS238QDYYRQ1 is an automotive-qualified 3-to-8 line decoder and demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an ambient temperature range from -40°C to +125°C. The device features Schmitt-trigger inputs for noise rejection and balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. Propagation delay ranges from 7 ns to 54 ns depending on voltage and temperature. It utilizes a 16-pin SOT-23-THIN package.

Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades
• Schmitt-trigger inputs provide tolerance for slow or noisy input signals
• Balanced CMOS push-pull outputs support high current drive capabilities
• Low power consumption with minimal static supply current

Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data in solid state memory systems

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the SN74HCS238-Q1 family includes multiple packages such as TSSOP, SOIC, WQFN, and SOT-23-THIN. Confirm that the Q1 suffix indicates automotive qualification requirements are met for your specific application environment. Ensure compatibility with system voltage levels and thermal constraints before finalizing procurement.

Selection Notes

Select this component when designing automotive logic circuits requiring address decoding or data routing. The Schmitt-trigger inputs are advantageous for environments with signal noise or slow transition times. Verify that the output drive current meets the load requirements, noting that unused outputs should remain disconnected to prevent damage.

Part Context

This part belongs to the SN74HCS238-Q1 series of high-speed silicon gate CMOS decoders. It is designed specifically for automotive applications, offering robust performance across wide voltage and temperature ranges. The device simplifies system design by allowing binary encoded inputs to activate single outputs efficiently.

Replacement Considerations

Direct substitutes within the same family include SN74HCS238PW-Q1 (TSSOP), SN74HCS238D-Q1 (SOIC), and SN74HCS238BQB-Q1 (WQFN). These alternatives share identical electrical characteristics but differ in physical package dimensions and pinout configurations.