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MC74ACT02D

MC74ACT02D Description

The MC74ACT02D from onsemi is a quad 2-input NOR gate IC belonging to the 74ACT series, designed for high-speed logic applications. Packaged in a 14-SOIC surface-mount form factor, it operates within a 4.5V to 5.5V supply range, making it suitable for 5V TTL-compatible systems. With a maximum propagation delay of 9.5ns @ 5V, 50pF, it ensures rapid signal processing, while its low quiescent current (4 µA max) enhances power efficiency. The device features 24mA output drive capability, enabling robust performance in driving capacitive loads. Although marked as obsolete, it remains relevant for legacy designs requiring reliable NOR gate functionality.

MC74ACT02D Features

• High-Speed Operation: 9.5ns propagation delay ensures quick response in critical timing applications.
• Wide Voltage Range: 4.5V–5.5V compatibility with TTL levels (0.8V low / 2V high input thresholds).
• Strong Output Drive: 24mA sink/source current for interfacing with multiple loads.
• Low Power Consumption: 4 µA max quiescent current minimizes standby power dissipation.
• Surface-Mount Design: 14-SOIC package optimizes board space in compact layouts.
• Quad Configuration: Four independent NOR gates in a single IC reduce component count.

MC74ACT02D Applications

• Digital Logic Systems: Ideal for combinational logic circuits, such as flip-flop reset circuits or clock gating.
• Signal Conditioning: Used in noise filtering and pulse shaping due to its fast response.
• Industrial Control: Suitable for PLC interfaces and safety interlock systems requiring NOR-based logic.
• Legacy Upgrades: Maintains compatibility with older 5V TTL designs needing drop-in replacements.
• Embedded Systems: Efficient for microcontroller I/O expansion or glitch suppression in timing-critical applications.

Conclusion of MC74ACT02D

The MC74ACT02D offers a balance of speed, power efficiency, and drive strength, making it a dependable choice for 5V logic systems. While obsolete, its TTL compatibility, robust output current, and compact packaging ensure continued utility in industrial, embedded, and legacy electronics. Engineers seeking a proven NOR gate solution for high-speed digital designs will find this IC a practical option despite its discontinued status.