STB9NK50ZT4 N-Channel MOSFET 500V 7.2A D2PAK | STM Original

STB9NK50ZT4 MOSFET: High-Performance Power Transistor for Demanding Applications

In the realm of power electronics, selecting the right transistor can make or break a project's success. STMicroelectronics' STB9NK50ZT4 MOSFET emerges as a robust solution for engineers requiring high voltage tolerance, efficient power management, and industrial-grade reliability. This N-channel power transistor combines advanced semiconductor technology with practical design features, making it ideal for switching applications in power supplies, motor controls, and energy-efficient systems.

Key Specifications and Performance Metrics

Built on STMicroelectronics' SuperMESH™ technology, the STB9NK50ZT4 delivers exceptional performance metrics that set it apart in the competitive landscape of power MOSFETs. With a 500V drain-source voltage rating and 7.2A continuous drain current capability, this device balances high-power handling with compact packaging. Its 850mΩ maximum Rds(on) at 3.6A and 10V gate-source voltage ensures minimal conduction losses, while the 32nC gate charge value enables fast switching operations.

Design Advantages and Reliability Features

The STB9NK50ZT4's D2PAK surface mount package combines thermal efficiency with modern manufacturing compatibility. Its ±30V gate-source voltage rating provides robustness against voltage spikes, while the 910pF input capacitance at 25V ensures stable operation in high-frequency circuits. The device's 110W maximum power dissipation (at case temperature) allows for demanding thermal environments without compromising performance longevity.

Engineers will appreciate the 4.5V gate threshold voltage (at 100µA) that enables efficient gate drive circuitry design. The component's compliance with industry-standard TO-263-3 packaging specifications ensures easy integration with existing PCB layouts while maintaining mechanical stability in industrial applications.

Application Versatility

This power MOSFET excels in various applications including:

• Switch-mode power supplies (SMPS)
• Motor drive inverters
• Lighting ballasts
• Industrial automation systems
• Renewable energy converters

While marked as 'Not For New Designs,' the STB9NK50ZT4 remains a valuable component for existing system upgrades and maintenance projects requiring proven reliability. Its specifications make it particularly suitable for applications where voltage spikes up to 500V must be safely managed without compromising current delivery.

Technical Considerations and Implementation Tips

When implementing this transistor in circuit designs, engineers should consider its surface mount packaging requirements. The D2PAK footprint demands proper thermal vias for optimal heat dissipation, especially when operating near the 110W power dissipation limit. Designers should also account for the device's 10V gate drive requirement when selecting driver ICs or discrete gate circuits.

The component's 25°C reference temperature for current ratings necessitates derating calculations for higher ambient temperature environments. Implementing proper snubber circuits is recommended to protect against voltage transients exceeding the 500V rating, particularly in inductive load applications.

Tags: Power Electronics, Semiconductor Devices, Industrial Components, Electrical Transistors, Electronic Modules