74HCT534D,653

Overview

The 74HCT534D,653 is an octal D-type flip-flop with 3-state outputs manufactured by NXP USA Inc. It belongs to the HCT logic family and utilizes CMOS technology. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 40 MHz at 5 V. It features synchronous data loading on the positive-going edge of the clock and includes a master reset input that forces all outputs low. The component is housed in a 20-pin SO package (SOT163) and is designed for surface mount installation.

Feature Summary

• Octal D-type flip-flop architecture with 3-state output capability
• Synchronous data loading triggered by the positive clock edge
• Master reset input provides synchronous clearing of all outputs
• Compatible with standard TTL logic levels via HCT family specifications

Applications

• Parallel-to-serial data conversion circuits
• General-purpose register storage applications
• Buffering digital signals with tri-state isolation

Procurement Notes

Verify the specific ordering code 74HCT534D,653 against current Nexperia or NXP documentation to confirm active status and pinout compatibility. Ensure the procurement source provides valid RoHS compliance certificates matching the component's environmental declarations. Cross-reference the package marking with the official datasheet to prevent counterfeit substitution during acquisition.

Selection Notes

Select this component when an octal register with tri-state outputs is required for systems operating at 5 V logic levels. The HCT series ensures direct compatibility with TTL inputs without additional level shifting. Consider the 20-pin SO package dimensions for PCB layout constraints and verify thermal requirements for the intended operating temperature range of -40 °C to +125 °C.

Part Context

This part is a member of the widely used 74HCT logic family, which bridges CMOS performance with TTL input compatibility. The 74HCT534 variant specifically provides eight independent D-type flip-flops, making it suitable for complex digital state management. It shares functional similarities with other octal registers but is distinguished by its specific HCT electrical characteristics and package configuration.

Replacement Considerations

Public confirmed substitute part numbers include 74HCT534D,652 and 74HCT534PW. Verify pinout and electrical specifications before substituting.