NCP301HSN45T1G: A Reliable Power Management IC Supervisor by onsemi

The NCP301HSN45T1G is a high-performance power management integrated circuit (PMIC) supervisor designed by onsemi, a global leader in semiconductor solutions. This precision component provides robust voltage monitoring for single-channel systems, ensuring reliable operation across diverse electronic applications. Despite being marked as obsolete, the NCP301HSN45T1G remains widely used due to its proven reliability in legacy systems and industrial environments.

Product Overview and Key Features

The NCP301HSN45T1G belongs to the Integrated Circuits (ICs) category, specifically classified as a PMIC - Supervisor. This voltage monitoring IC serves as a critical component in power management systems, offering:

• Single-channel voltage monitoring with 4.5V threshold
• Open-drain/open-collector output configuration
• Active-high reset functionality
• Wide operating temperature range (-40 C to +125 C)
• Compact SOT-23-5 (TSOT-23-5) surface-mount package

Detailed Technical Specifications

Voltage Monitoring Characteristics

The NCP301HSN45T1G provides precise monitoring of power supply voltages with:

• Monitoring Accuracy: 1.5% typical threshold accuracy
• Hysteresis: Built-in hysteresis for noise immunity
• Response Time: Fast detection of voltage drops

Reset Functionality

This supervisor IC features:

• Active-high reset output signal
• Guaranteed reset assertion down to VCC = 1V
• No external components required for basic operation

Package and Environmental Specifications

• Package Dimensions: 2.9mm 1.6mm 1.1mm
• Moisture Sensitivity Level (MSL): 1 (Unlimited floor life)
• RoHS Compliance: Meets environmental standards

Applications and Use Cases

The NCP301HSN45T1G finds application in numerous fields including:

Industrial Systems

• PLC (Programmable Logic Controller) power monitoring
• Industrial automation equipment
• Motor control systems

Consumer Electronics

• Set-top boxes and digital TVs
• Home automation systems
• Gaming consoles

Embedded Computing

• Microprocessor and microcontroller supervision
• Single-board computers
• IoT edge devices

Design Considerations

PCB Layout Recommendations

For optimal performance:

• Place the IC close to the monitored power rail
• Use proper ground plane techniques
• Minimize trace lengths to reduce noise pickup

System Integration Tips

• Combine with bulk capacitors for stable operation
• Consider adding a small pull-up resistor for open-drain output
• Verify reset timing meets system requirements

Why Choose NCP301HSN45T1G?

Key advantages of this voltage supervisor include:

• Reliability: Proven performance in demanding environments
• Compact Size: Space-saving SOT-23-5 package
• Wide Temperature Range: Suitable for industrial applications
• Simple Implementation: Easy to design into new systems

Frequently Asked Questions

Q: Is the NCP301HSN45T1G still available despite being obsolete?

A: Yes, while marked obsolete by the manufacturer, the NCP301HSN45T1G remains available through authorized distributors and inventory specialists.

Q: What are the alternatives to NCP301HSN45T1G?

A: Alternative options include the NCP302, NCP303, and TPS3808 series, though each has slightly different specifications.

Q: How does the open-drain output benefit my design?

A: The open-drain output allows for flexible voltage level translation and wired-OR connections in multi-supply systems.

Conclusion

The NCP301HSN45T1G from onsemi represents an excellent solution for power supply monitoring in critical electronic systems. Its combination of precision voltage monitoring, robust packaging, and wide operating temperature range makes it particularly valuable for industrial and embedded applications. While newer alternatives exist, the NCP301HSN45T1G continues to be specified in designs due to its proven track record and availability in the marketplace.

For engineers seeking reliable power supervision in space-constrained applications, the NCP301HSN45T1G offers an optimal balance of performance, size, and cost-effectiveness. Its simple implementation and dependable operation make it a preferred choice for system designers worldwide.