SN74AHCT595QPWRQ1

Shift Registers Overview

The SN74AHCT595QPWRQ1 is an automotive-grade, 8-bit serial-in, parallel-out shift register with a D-type storage register and 3-state outputs. It operates within a supply voltage range of 4.5V to 5.5V and supports temperatures from -40°C to +125°C. The device features TTL-compatible inputs, positive-edge triggered clocks for both shift and storage registers, and a direct overriding clear input. It is available in 16-pin TSSOP (PW) and WQFN (BQB) packages.

Shift Registers Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classification levels.
• TTL-compatible CMOS inputs designed to interface directly with standard TTL logic devices.
• Balanced CMOS 3-state outputs capable of sourcing and sinking similar currents.
• Wettable flank design on the QFN package variant to improve side wetting and facilitate automatic optical inspection.

Shift Registers Applications

• Network switches
• Power infrastructures
• LED displays

Shift Registers Procurement Notes

Verify the specific package suffix against the orderable part number list to ensure correct physical dimensions and lead finish. Confirm that the selected variant meets the required moisture sensitivity level and peak reflow temperature specifications for the manufacturing process. Ensure the ordering suffix aligns with the desired carrier type and quantity constraints defined in the packaging information.

Shift Registers Selection Notes

Select this component when a 5V logic family with TTL-compatible input thresholds is required for automotive environments. The AHCT series provides balanced drive capabilities suitable for bus interfaces where output ringing must be minimized. Consider the BQB package if enhanced solder joint inspection via AOI is necessary compared to the standard PW package.

Shift Registers Part Context

This device belongs to the SN74AHC/AHCT595-Q1 family of automotive shift registers. It shares functional similarities with other members of the AHC and AHCT families but is specifically optimized for 5V operation with TTL-compatible input levels. The 'Q1' designation indicates its qualification for automotive reliability standards.

Shift Registers Replacement Considerations

Direct substitutes include CAHCT595QWBQBRQ1 for the WQFN package variant. Verify pinout compatibility and electrical characteristics before replacing the TSSOP version with alternative manufacturers' parts.

Shift Registers FAQ

How does the device handle unused inputs?

Unused inputs must not be left floating. They should be terminated at VCC or GND using a pull-up or pull-down resistor, typically 10kΩ, to prevent undefined operational states and excessive power consumption.

What is the function of the SRCLR input?

The SRCLR input provides a direct overriding clear for the shift register. When asserted low, it clears the shift register regardless of the clock signals.