NC7WZ126K8X

Product Overview
The onsemi NC7WZ126K8X is a high-performance single buffer/inverter device belonging to the NC7WZ family of CMOS logic circuits. It is designed to provide robust signal buffering and inversion with low power consumption, high noise immunity, and wide operating voltage range, making it ideal for level shifting, signal conditioning, and general logic interface applications. Packaged in a compact SOT-553 (SC-88) small-outline transistor package, it is well-suited for space-constrained designs in portable and industrial electronics.

Device Architecture and Technology
The NC7WZ126K8X is fabricated using advanced CMOS technology optimized for low-voltage operation, fast switching, and low static power dissipation. The device incorporates a dedicated output buffer with a built-in pulldown transistor to improve noise margin and reduce switching noise, making it superior to standard inverters in noisy environments.

* Device Type: Single CMOS buffer/inverter with open-drain output and integrated pull-down transistor
* Technology: Advanced CMOS process for low power and high speed
* Package: SOT-553 (SC-88) surface-mount package with 5 pins
* Lead Finish: RoHS compliant matte tin plating for reliable solderability

Electrical Characteristics
The device operates over a wide voltage range and offers excellent switching performance with minimal power dissipation.

* Supply Voltage (V\_CC): 1.65 V to 5.5 V, supporting both low-voltage and traditional 5 V logic systems
* Input Voltage Range: 0 V to V\_CC
* Output Voltage Levels:
– Output can drive to V\_CC (logic high) or pull to GND (logic low) via open-drain configuration
* Output Current Capability: ±24 mA maximum output drive current (at 5 V) suitable for driving LEDs and other loads
* Propagation Delay (t\_PHL, t\_PLH): Typically 4 ns at V\_CC = 5 V, enabling high-speed logic operation
* Input Leakage Current (I\_IN): ±1 µA maximum
* Quiescent Supply Current (I\_CC): Typically 2 µA maximum at 5 V, ensuring low power consumption in static state
* Input Threshold Voltage: CMOS input threshold for noise immunity compatible with TTL and CMOS logic levels

Functional Description
The NC7WZ126K8X functions as a single inverter with an open-drain output stage combined with an internal pulldown device. This architecture ensures the output can be actively driven low or left floating for wired-AND logic or level shifting, making it versatile in mixed-signal environments.

* Input is buffered and inverted internally
* Output is open-drain, requiring an external pull-up resistor for proper high-level output
* Integrated pulldown transistor prevents floating output states and improves noise margin
* Supports wired-AND logic configurations for bus sharing and multiple device outputs

Thermal and Mechanical Specifications
The small footprint and low-profile package make the device ideal for compact PCB designs requiring efficient thermal dissipation.

* Operating Temperature Range: –40°C to +125°C
* Storage Temperature Range: –65°C to +150°C
* Thermal Resistance Junction-to-Ambient (R\_θJA): Approximately 270 °C/W (depends on PCB design and airflow)
* Package Dimensions: SOT-553 with approximately 2.0 mm × 1.6 mm × 1.0 mm dimensions

Applications
Due to its open-drain output and high-speed operation, the NC7WZ126K8X is commonly used in multiple electronic design scenarios requiring signal inversion, buffering, and logic level conversion.

* Level shifting between different voltage domains in mixed-signal systems
* Wired-AND bus applications and signal multiplexing
* LED driving with open-drain outputs for brightness control
* Signal buffering and noise reduction in communication interfaces
* Logic inversion in microcontroller and FPGA interfaces
* Power management circuits requiring low static power consumption

Reliability and Quality
onsemi ensures that the NC7WZ126K8X meets stringent reliability and quality standards for industrial and commercial applications.

* RoHS and REACH compliant manufacturing
* High Electrostatic Discharge (ESD) tolerance:
– Human Body Model (HBM): > 4 kV
– Machine Model (MM): > 200 V
* Consistent electrical performance over wide temperature and voltage ranges
* Quality-tested for long-term stability and performance in harsh environments

Typical Circuit Usage
The NC7WZ126K8X is often used in circuits where open-drain logic is required. For example, an external pull-up resistor connects the open-drain output to a positive voltage rail, enabling wired-AND or open-collector type logic functions. It is also used to invert signals while isolating or protecting downstream logic.

Key Specifications Summary

* Device Type: Single CMOS buffer/inverter with open-drain output and pulldown
* Supply Voltage: 1.65 V to 5.5 V
* Output Drive Current: ±24 mA max at 5 V
* Propagation Delay: ~4 ns at 5 V
* Input Leakage Current: ±1 µA max
* Package: SOT-553 (SC-88), 5-pin surface mount
* Operating Temperature: –40°C to +125°C

The onsemi NC7WZ126K8X combines fast, low-power CMOS logic with open-drain output architecture and enhanced noise immunity, making it a versatile and reliable component for modern electronic designs that require robust buffering, level shifting, and logic inversion within compact, power-sensitive applications.