Overview

The 74ACT00SC from Fairchild/ON Semiconductor is a high-speed CMOS logic gate device in the Advanced CMOS TTL-compatible (ACT) family. It implements four independent 2-input NAND gates, providing basic combinational logic functions that are widely used for enable signals, simple decoding, timing, and control logic. As an ACT-series part, it is designed to operate from a 5 V supply with TTL-compatible input thresholds and faster edge rates than standard 74HC logic, making it suitable where traditional 5 V digital logic must interface with higher-performance circuitry. Typical features of this family include low power consumption compared to bipolar TTL and the ability to drive standard logic loads at high speed.

Applications

• General-purpose glue logic in microcontroller- or DSP-based embedded systems
• Digital control and status logic in industrial control boards and PLC I/O modules
• Signal gating, enables, and simple decoding in communication or networking equipment
• Timing and control functions in consumer electronics and home appliances
• Interface and level-compatible logic in instrumentation and laboratory equipment
• Custom logic replacement or consolidation in legacy 5 V digital designs

Alternatives & Replacement

Depending on availability, lifecycle status, or specific design constraints (speed, power, or logic function), you may need to consider alternative logic devices or families. Even when the basic logic function is similar, differences in propagation delay, supply voltage range, drive capability, and package can affect drop-in compatibility.

Recommended alternatives:

• NC7SZ04M5 – Fairchild/ON Semiconductor, single inverter gate (Redesign required)
• 74HCT1G08GW-Q100,1 – Nexperia USA Inc., single 2-input AND gate, automotive qualified (Redesign required)
• SN74LVC1G08DCKRG4 – Texas Instruments, single 2-input AND gate, LVC family (Redesign required)
• NC7S14M5 – Fairchild/ON Semiconductor, single Schmitt-trigger inverter (Redesign required)
• SN74LVC1G86DCKT – Texas Instruments, single 2-input XOR gate (Redesign required)

Engineering note: the alternatives listed are not pin-, function-, or package-identical replacements and are flagged as “redesign required”. Always review the full datasheet for each candidate device and verify logical function, pinout, package footprint, supply voltage range, input thresholds, timing (propagation delay), and drive strength against your original 74ACT00SC design before committing to a substitute.