74ACT14SCX Datasheet, Features, Pinout, and Applications

The 74ACT14SCX, manufactured by onsemi (formerly Fairchild), is a high-speed CMOS logic device that integrates six independent Schmitt Trigger inverters into a single SOIC-14 package. With fast switching times, TTL-compatible inputs, and input hysteresis, it's a reliable choice for signal conditioning, edge shaping, and noise immunity in digital circuits.

Overview

The 74ACT14SCX belongs to the ACT logic family and is designed using advanced CMOS technology. It offers TTL-compatible input levels while maintaining high-speed performance. It is commonly used in industrial, communication, and embedded system applications that require clean, noise-free logic signals.

Key Features

• Six independent inverters with Schmitt Trigger inputs

• Advanced CMOS technology for high-speed performance

• Typical propagation delay of 6.5 nanoseconds at 5V

• TTL-compatible input voltage levels

• Built-in hysteresis for improved noise immunity

• ±24mA output drive capability

• Wide operating voltage range from 2V to 6V

• Low power consumption

• Surface-mount SOIC-14 package

• RoHS compliant and lead-free

Electrical Characteristics

The 74ACT14SCX operates within a supply voltage range of 2V to 6V. The inputs accept standard TTL logic levels, with input thresholds typically around 0.8V for low and 2.0V for high. The propagation delay is approximately 6.5ns at 5V, making it suitable for high-speed applications. The output stage can sink or source up to 24mA, allowing it to drive moderate loads such as LEDs or logic gates directly.

Pinout Description

The 74ACT14SCX comes in a 14-pin SOIC package. It includes six inverting gates, each with a Schmitt Trigger input. Pins 1, 3, 5, 9, 11, and 13 are the inputs labeled 1A through 6A. Pins 2, 4, 6, 8, 10, and 12 are the outputs labeled 1Y through 6Y. Pin 14 is the power supply (VCC), and pin 7 is ground (GND).

Functional Description

Each of the six gates in the 74ACT14SCX functions as an inverter with Schmitt Trigger input behavior. This means the gate outputs a logic LOW when the input is HIGH, and a logic HIGH when the input is LOW, but with added hysteresis. This input hysteresis ensures that noisy or slow-rising signals do not cause multiple transitions at the output, improving system stability.

Applications

The 74ACT14SCX is ideal for applications where signal integrity is critical. It is commonly used to debounce mechanical switches in embedded systems, clean up noisy waveforms, create oscillators, and interface noisy digital inputs to microcontrollers. It also finds use in industrial automation, digital communication circuits, and test equipment.

Ordering and Availability

The 74ACT14SCX is available in tape and reel format for automated surface-mount assembly. It is widely distributed and in stock at major suppliers such as Mouser, Digi-Key, and Censtry. Its moisture sensitivity level is 1, meaning it does not require special handling in most environments.

Alternatives

If you are looking for similar devices, you may consider the 74HC14 or 74HCT14 for lower-speed or lower-power applications. For applications requiring faster switching speeds, the 74AC14 may be a better fit. The CD40106BE is another alternative that supports a wider supply voltage range but is generally slower.

Conclusion

The 74ACT14SCX offers a robust and high-speed solution for logic inversion and signal conditioning, particularly in environments where input signals are noisy or unstable. Its Schmitt Trigger inputs and strong output drive make it ideal for a wide range of digital circuit applications. Whether you’re building a reliable interface or conditioning signals for sensitive digital inputs, the 74ACT14SCX is a proven, dependable choice.