STMicroelectronics STW9NK95Z N-Channel MOSFET 950V 7A TO-247

High-Performance STW9NK95Z N-Channel MOSFET for Demanding Power Applications

STMicroelectronics continues to set industry benchmarks with its STW9NK95Z N-Channel MOSFET, a high-voltage solution engineered for industrial power systems requiring exceptional reliability and efficiency. This 950V, 7A TO-247 packaged transistor combines advanced SuperMESH™ technology with robust thermal management capabilities, making it ideal for power supplies, motor drives, and energy-efficient converters. In this comprehensive overview, we explore the technical specifications, performance advantages, and application scenarios that position this device as a critical component for modern power electronics.

Technical Specifications and Performance Metrics

At the core of the STW9NK95Z's capabilities is its 950V drain-source voltage rating, which enables operation in high-voltage environments while maintaining stability under thermal stress. The device's N-channel MOSFET architecture delivers 1.38Ω on-resistance at 3.6A and 10V gate-source voltage, minimizing conduction losses in switching applications. Its ±30V gate voltage tolerance provides design flexibility, while the 4.5V gate threshold voltage ensures compatibility with standard logic controllers.

The device's 2256 pF input capacitance and 56 nC gate charge characteristics optimize switching performance, reducing energy losses in high-frequency operations. Its TO-247-3 package provides excellent thermal dissipation, supporting 160W power dissipation under standard mounting conditions.

SuperMESH™ Technology Advantages

STMicroelectronics' proprietary SuperMESH™ technology forms the foundation of the STW9NK95Z's superior performance. This innovative approach to MOSFET design achieves an optimal balance between on-resistance and capacitance parameters, enabling:

- Enhanced switching efficiency in hard-switched and resonant topologies
- Reduced electromagnetic interference (EMI) through controlled switching transitions
- Improved avalanche energy ratings for robustness in inductive load applications

Engineers benefit from the device's predictable behavior across temperature ranges, with minimal parameter variation between -55°C and 150°C operating conditions.

Application Versatility

The STW9NK95Z's combination of voltage rating and current capacity makes it particularly suited for:

Industrial Power Supplies: High-voltage DC-DC converters and uninterruptible power supply (UPS) systems leverage its 950V rating for enhanced safety margins.
Motion Control Systems: Motor drives in automation equipment utilize its 7A continuous current capability for precise torque control.
Renewable Energy Systems: Solar inverters and energy storage systems benefit from its low conduction losses and thermal stability.
Home Appliances: Induction cookers and high-power domestic equipment exploit its robustness in repetitive switching environments.

Design Considerations and Implementation

When integrating the STW9NK95Z into circuit designs, engineers should consider:

- Thermal management: The TO-247 package requires adequate heatsinking for power dissipation above 50W
- Gate drive circuitry: Implementing proper snubber networks to protect against voltage spikes
- PCB layout: Minimizing parasitic inductance in high-current paths
- Derating: Applying appropriate current reduction curves at elevated temperatures

The device's ±30V gate voltage tolerance allows compatibility with various driver ICs, while its 100µA gate threshold current simplifies biasing requirements.

Quality and Reliability

As part of STMicroelectronics' industrial-grade component portfolio, the STW9NK95Z undergoes rigorous testing to meet:

- JEDEC qualification standards
- AEC-Q101 automotive stress requirements
- 100% avalanche testing in production
- RoHS and REACH compliance

This ensures consistent performance in harsh environments characterized by vibration, humidity, and temperature extremes.

Conclusion: A Benchmark in High-Voltage MOSFETs

The STW9NK95Z represents STMicroelectronics' commitment to advancing power transistor technology. Its combination of high-voltage capability, low on-resistance, and robust packaging makes it a versatile solution for engineers developing next-generation power systems. Whether designing industrial motor drives, renewable energy inverters, or high-efficiency power supplies, this N-channel MOSFET provides the performance characteristics needed to meet modern energy efficiency standards while maintaining design simplicity and cost-effectiveness.

Tags: Power MOSFET, Industrial Electronics, STM Components, High Voltage Transistors, TO-247 Devices