74VHCT74ATTR

Overview

The 74VHCT74ATTR is a dual D-type flip-flop manufactured by STMicroelectronics, belonging to the 74VHCT series. It operates on a single supply voltage of 4.5V to 5.5V and features TTL-compatible inputs with low noise immunity (V OL max 0.8V). The device provides synchronous set and reset capabilities via dedicated inputs. It supports output currents of 8mA for both high and low states. The maximum propagation delay is 8ns at 5V with a 50pF load. Static current consumption is maximized at 2µA. It is housed in a 14-TSSOP surface-mount package and rated for operation between -55°C and 125°C.

Feature Summary

• Dual D-type flip-flop configuration with independent clock, data, set, and reset inputs
• TTL-compatible input logic levels ensuring direct interfacing with standard logic families
• Synchronous operation with asynchronous preset and clear functions for flexible state control

Applications

• Data storage and register applications in digital systems
• Shift register construction for serial-to-parallel conversion
• Timing and synchronization circuits requiring precise clock edge triggering

Procurement Notes

Verify component authenticity through authorized distributors due to potential availability of obsolete or refurbished units. Confirm RoHS compliance status and specific tape-and-reel packaging quantities prior to ordering. Check for alternative active replacements if long-term supply stability is required for production environments.

Selection Notes

Select this component when TTL-level compatibility is required alongside high-speed CMOS performance. Ensure the operating voltage range aligns with the 4.5V to 5.5V specification. Consider the 14-TSSOP package dimensions for PCB layout constraints and verify thermal requirements against the specified operating temperature range.

Part Context

This part belongs to the 74VHCT family, which combines the speed of VHCT technology with the input compatibility of HCT logic. It serves as a high-performance solution for mixed-voltage interfaces where reliable switching speeds are critical while maintaining robustness against noise in industrial environments.

Replacement Considerations

Direct substitutes include SN74AHCT74PWR from Texas Instruments and 74AHCT74PW,118 from Nexperia. Verify pinout compatibility and electrical parameter alignment before integration into existing designs.