74HC74D/AUJ

Overview

The NXP USA Inc. 74HC74D/AUJ is a dual positive edge-triggered D-type flip-flop housed in a 14-pin SO package. It features individual data, clock, set, and reset inputs with complementary outputs. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40 °C to +125 °C. It exhibits symmetrical output impedance, low power dissipation, and high noise immunity. The component complies with JEDEC standard no. 7A and includes Schmitt-trigger action on the clock input for tolerance to slow rise times.

Feature Summary

• Dual positive edge-triggered D-type flip-flops with asynchronous active LOW set and reset inputs
• Complementary outputs (Q and Q) with symmetrical output impedance
• Schmitt-trigger action on the clock input for improved noise tolerance
• Inputs include clamp diodes allowing interface to voltages exceeding VCC

Applications

• Parallel-to-serial or serial-to-parallel data conversion circuits
• Digital signal processing systems requiring data storage
• Timing control logic in embedded systems
• General-purpose digital state retention applications

Procurement Notes

Verify the specific suffix 'AUJ' against official NXP documentation to confirm package dimensions and marking details, as datasheets may list generic 'D' variants. Ensure compliance with RoHS directives if required by your manufacturing standards. Confirm availability status directly with authorized distributors, as lead times and stock levels fluctuate. Validate that the 14-SOIC package matches your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when dual independent D-type storage elements are required in a compact surface-mount package. The 74HC series offers CMOS compatibility with TTL-level inputs for the HCT variant, though this HC version requires CMOS level inputs. Consider the wide operating temperature range (-40 °C to +125 °C) for industrial environments. The presence of set and reset inputs provides immediate control over output states independent of the clock signal.

Part Context

The 74HC74 belongs to the widely adopted 74HC family of high-speed CMOS logic devices. This family is pin-compatible with Low-Power Schottky TTL (LSTTL), facilitating easy upgrades in existing designs. The 74HC74 specifically provides two independent flip-flops, making it a fundamental building block for sequential logic circuits. Its robust ESD protection and balanced propagation delays ensure reliable operation in various digital systems.

Replacement Considerations

The 74HC74D is functionally equivalent to other manufacturers' 74HC74 parts in SO-14 packages. Verify pinout compatibility before substitution. For automotive applications, consider the 74HC74-Q100 variant which meets AEC-Q100 standards. Ensure replacement parts maintain the same voltage and temperature specifications.