SN74HCS165QWBQBRQ1

Shift Registers Overview

The SN74HCS165QWBQBRQ1 is an automotive-grade, 8-bit parallel-load shift register from the Texas Instruments HCS logic family. It operates within a supply voltage range of 2 V to 6 V and supports ambient temperatures from -40°C to +125°C. The device features Schmitt-trigger inputs for noise tolerance and balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. It utilizes a 16-pin WQFN (WBQB) package with wettable flanks.

Shift Registers Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD protection levels.
• Schmitt-trigger inputs provide high noise immunity and support slow or noisy input signals.
• Balanced CMOS push-pull outputs ensure similar sourcing and sinking capabilities for reliable signal transmission.
• Wettable flank QFN package design facilitates improved side soldering and enables automatic optical inspection.

Shift Registers Applications

• Increasing the number of available inputs on a microcontroller
• Cascading multiple units to expand data input capacity while maintaining single serial interface usage

Shift Registers Procurement Notes

Verify that the specific WBQB package variant matches the required footprint and thermal pad configuration. Confirm AEC-Q100 qualification status aligns with target automotive reliability standards. Ensure operating conditions remain within the specified 2 V to 6 V voltage and -40°C to +125°C temperature ranges during system integration.

Shift Registers Selection Notes

Select this component when designing automotive systems requiring robust noise rejection via Schmitt-trigger inputs. Consider the wide 2 V to 6 V operating range for flexibility in power supply architectures. Evaluate the wettable flank package benefits if automated optical inspection is critical for production quality control.

Shift Registers Part Context

This part belongs to the SN74HCS165-Q1 series, which includes variants in TSSOP, SOIC, WQFN, and SOT-23-THN packages. All variants share identical electrical characteristics and functionality, differing only in physical package dimensions and pinout configurations suitable for various PCB layout constraints.

Shift Registers Replacement Considerations

Direct substitutes include other SN74HCS165-Q1 variants such as SN74HCS165PW-Q1, SN74HCS165D-Q1, SN74HCS165BQB-Q1, and SN74HCS165DYY-Q1. Verify package compatibility before substitution.

Shift Registers FAQ

How does the device handle slow input signals?

The integrated Schmitt-trigger architecture provides hysteresis, making the device tolerant to slow or noisy input signals without causing excessive dynamic current consumption.

What is the function of the CLK INH input?

Holding the CLK INH input high prevents clock pulses from being detected, effectively inhibiting the shifting operation regardless of the state of the primary CLK input.