onsemi NC7WZ240K8X

NC7WZ240K8X by onsemi Product Summary

The onsemi NC7WZ240K8X is a compact, dual inverting buffer equipped with 3-state outputs, fabricated with advanced CMOS technology. Targeting demanding digital signal buffering tasks, it is designed to deliver ultra-high switching speeds along with robust output drive capabilities. Occupying minimal PCB real estate due to its US8 surface-mount package, the NC7WZ240K8X is particularly well-suited for modern, densely populated circuit boards in both consumer and industrial electronics.

Main Attributes of the NC7WZ240K8X

The NC7WZ240K8X distinguishes itself with several critical performance and operational attributes:

Ultra high-speed operation with a typical propagation delay ($t_{PD}$) of 2.3 ns into a 50 pF load at 5 V $V_{CC}$.

High output drive capabilities of ±24 mA at 3 V $V_{CC}$, accommodating both strong signal transmission and moderate capacitive loading.

Broad supply voltage range, supporting operation from 1.65 V to 5.5 V, allowing integration into new and legacy logic systems with varied voltage rails.

Compliance with RoHS, halogen-free, and lead-free requirements, ensuring suitability for environmentally friendly product lines.

Inputs and outputs maintain high impedance when unpowered ($V_{CC} = 0$ V), effectively eliminating the risk of back-powering connected circuitry.

Overvoltage-tolerant I/O, ensuring inputs can safely handle up to 5.5 V regardless of $V_{CC}$, and outputs can tolerate voltages above $V_{CC}$ when in high-impedance (3-state) mode.

Power-down features with high-impedance behavior safeguard the integrity of multi-voltage systems.

Proprietary EMI and noise reduction techniques are integrated, minimizing the impact on system signal integrity.

Operational Functions and Logic Details of the NC7WZ240K8X

The core of the NC7WZ240K8X functionality lies in its configuration as a dual inverting buffer, each section featuring independent active-low enable controls for 3-state output operation. This architecture allows each buffer element to independently drive, isolate, or tristate its output line based on system requirements.

Logic levels are clearly defined, with the device offering robust protection against input floating by recommending that all unused inputs be tied high or low, avoiding undefined logic states during operation. This safeguard is essential from an engineering perspective, as floating CMOS inputs can lead to unpredictable behavior or increased power consumption.

The input and output behavior follows industry-standard conventions, and the inclusion of 5 V tolerant inputs makes the NC7WZ240K8X ideal for translating signals in mixed-voltage systems—such as interfacing between legacy 5 V logic and modern 3.3 V or lower voltage domains—without requiring external level shifters.

Electrical Specifications and Timing Parameters of the NC7WZ240K8X

Engineers will appreciate the NC7WZ240K8X’s tight electrical limits and timing parameters, which are particularly relevant in high-speed digital buses where timing margins are critical. Key electrical characteristics include:

Wide operational $V_{CC}$ tolerance (1.65–5.5 V) supporting versatile integration.

Minimal static current draw ensures low quiescent power consumption—a valuable trait in battery-operated or low-power designs.

Output drive characteristics ensure compatibility with a variety of digital logic load conditions, capable of driving substantial fanout or capacitive loading.

Noise and EMI performance is managed by dedicated reduction circuits, important in systems where signal integrity and regulatory compliance are key.

AC characteristics such as rise/fall times, propagation delay, and dynamic power consumption are specified to facilitate precise timing analysis during design.

Use Cases for the NC7WZ240K8X

In typical engineering applications, the NC7WZ240K8X is used where signal inversion, buffering, and line isolation are necessary. Its small footprint makes it an excellent choice for hand-held devices, industrial controllers, and network equipment where PCB space is at a premium. For example:

Bus drivers for microprocessors or FPGAs, requiring fast, clean logic transitions and the option to disconnect from the bus via 3-state outputs.

Mixed-voltage translation, where signals from older 5 V logic must interface with 3.3 V or even lower-voltage components.

Digital switching in systems needing high drive strength and ultra-fast response for sampling, address decoding, or multiplexing circuits.

Package Variants and Physical Specifications for the NC7WZ240K8X

The NC7WZ240K8X is offered in a space-saving US8 (Ultra-Small 8-pin) surface-mount package. Mechanical specifications align with JEDEC MO-187 standards, and operate within industry-standard land pattern recommendations, ensuring compatibility with automated assembly processes.

Detailed pin assignments, pad layouts, and orientation diagrams facilitate error-free PCB layout and assembly. The device’s mechanical robustness and portability to existing manufacturing lines streamline the adoption process, especially for engineers seeking drop-in replacements or upgrades.

Alternative or Substitute Models for the NC7WZ240K8X

As the NC7WZ240K8X has been identified as discontinued for new designs, component selection engineers and procurement personnel should consider alternative models to future-proof development and production. Devices matching its electrical and functional profile, such as other TinyLogic UHS inverting buffers with 3-state outputs and wide $V_{CC}$ ranges, may qualify. When selecting a potential equivalent, core factors to consider include:

Pin-for-pin compatibility in US8 or comparable SMD packages.

Propagation delay and output drive characteristics suitable for high-speed applications.

5 V tolerant inputs and 3-state output capability.

Environmental compliance and supply chain reliability.

Thorough vetting of mechanical and electrical compatibility is recommended, with reference to vendors' current portfolio of UHS logic buffers to identify the closest drop-in replacements or redesign options.

Conclusion

: Selecting the NC7WZ240K8X for Reliable High-Speed Buffering Solutions

The onsemi NC7WZ240K8X serves as a robust solution for high-speed, low-power digital buffering and signal inversion. Its highly integrated features, advanced CMOS process, and small footprint offer tangible benefits for designers working within space, speed, and power constraints. While its discontinuation status necessitates forward consideration of replacement parts, understanding the unique advantages and system-level integration points of the NC7WZ240K8X equips engineers and procurement specialists to make informed, long-term component selection decisions in a rapidly evolving electronics landscape.