74HC574BQX

Overview

The 74HC574BQX is an octal D-type flip-flop manufactured by Nexperia USA Inc., belonging to the HC/UH logic series. It features positive edge-triggering and three-state outputs, enabling direct interfacing with CMOS, NMOS, and TTL loads. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports a maximum clock frequency of 36 MHz. It is housed in a 20-VFQFN package with exposed thermal pads, measuring 4.5 mm by 2.5 mm. The component is specified for operation across a temperature range of -40 °C to +125 °C and complies with JEDEC standards JESD8C and JESD7A.

Feature Summary

• Octal D-type flip-flop architecture with positive edge triggering
• Three-state outputs for bus-oriented systems
• Wide operating voltage range from 2.0 V to 6.0 V
• Compliant with JEDEC JESD8C and JESD7A standards

Applications

• Parallel-to-serial data conversion circuits
• Bus driver applications requiring high noise immunity
• Register files in microcontroller-based systems
• Industrial control system interface modules

Procurement Notes

Verify the exact suffix 'BQX' against official Nexperia documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprint designs, as VFQFN packages require specific soldering profiles. Confirm RoHS compliance status and moisture sensitivity level prior to assembly to prevent damage during reflow processes.

Selection Notes

Select this component when designing systems requiring octal storage with tri-state output capability. The HC series offers symmetrical output impedance and low power dissipation suitable for general-purpose digital logic. Consider the 2.0 V to 6.0 V operating range for flexibility in mixed-voltage environments. Ensure the 36 MHz maximum frequency meets the system timing requirements.

Part Context

This part belongs to the 74HC574 family of octal D-type flip-flops. It shares functional similarities with other variants like the 74HC574PW but differs in packaging. The HC series is known for high-speed operation and low power consumption compared to older logic families. It serves as a standard solution for storing 8-bit data words in digital electronics.

Replacement Considerations

Direct substitutes include the 74HC574PW (TSSOP-20) and 74HC574D (SO-20). Verify pinout compatibility and thermal pad connectivity when replacing the VFQFN package with leaded alternatives. Check if the application requires specific drive capabilities or speed grades that might differ between package variants.