SN74HCS138QPWRQ1

Overview

The SN74HCS138QPWRQ1 is an automotive-qualified 3-to-8-line decoder/demultiplexer featuring Schmitt-trigger inputs. 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 utilizes a TSSOP-16 package and provides 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 conditions.

Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classification levels.
• Schmitt-trigger inputs provide tolerance for slow or noisy input signals through defined hysteresis.
• Wide operating voltage range allows compatibility with various power supply standards from 2 V to 6 V.
• Low power consumption characteristics include typical supply current of 100 nA and low input leakage.

Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the SN74HCS138-Q1 family includes multiple packages such as TSSOP, SOIC, WQFN, and SOT-23-THN. Confirm that the Q1 suffix denotes automotive qualification and AEC-Q100 compliance. Ensure the selected variant aligns with the thermal and mechanical constraints of the target PCB layout.

Selection Notes

Select this component when automotive reliability and noise immunity are critical due to its Schmitt-trigger architecture. The wide voltage range suits systems requiring operation between 2 V and 6 V. Consider the TSSOP-16 package dimensions and thermal resistance values if heat dissipation is a concern in dense layouts. Verify output drive requirements against the ±7.8 mA capability at maximum voltage.

Part Context

This part belongs to the Texas Instruments SN74HCS138-Q1 series of high-speed silicon gate CMOS decoders. The HCS designation indicates the inclusion of Schmitt-trigger inputs for enhanced noise rejection. The 'Q1' suffix specifically identifies the device as being qualified for automotive applications, distinguishing it from standard commercial logic variants.

Replacement Considerations

SN74HCS138PW-Q1 (TSSOP-16), SN74HCS138D-Q1 (SOIC-16), SN74HCS138BQB-Q1 (WQFN-16), SN74HCS138DYY-Q1 (SOT-23-THN-16), SN74HCS138WBQB-Q1 (WQFN-16).