MOSFET Selection for High-Voltage Power Applications: STW75N60M6, STF28NM50N vs. China Alternatives VBP16R64SFD, VBMB15R24S
In the design of high-voltage and high-efficiency power systems, selecting a MOSFET that delivers robust performance and reliability is a critical task for engineers. This involves careful balancing of voltage rating, current capability, switching characteristics, and thermal management. This article takes two representative high-voltage MOSFETs from STMicroelectronics—STW75N60M6 (600V) and STF28NM50N (500V)—as benchmarks, analyzes their design cores and typical applications, and evaluates two domestic alternative solutions, VBP16R64SFD and VBMB15R24S. By comparing their parameter differences and performance orientations, we provide a clear selection guide to help you find the optimal power switching solution for your next high-voltage design.
Comparative Analysis: STW75N60M6 (600V N-channel) vs. VBP16R64SFD
Analysis of the Original Model (STW75N60M6) Core:
This is a 600V N-channel MOSFET from STMicroelectronics, utilizing the MDmesh M6 technology in a TO-247 package. Its design core is to achieve low conduction loss and high current handling in high-voltage applications. Key advantages include: a low typical on-resistance of 32mΩ (36mΩ @10V per datasheet), a high continuous drain current rating of 72A, and the advanced MDmesh structure which offers excellent switching performance and dv/dt capability.
Compatibility and Differences of the Domestic Alternative (VBP16R64SFD):
VBsemi's VBP16R64SFD is also offered in a TO-247 package and serves as a pin-to-pin compatible alternative. The key parameters show a strong match: both are 600V rated, with identical on-resistance of 36mΩ @10V. The continuous current rating of VBP16R64SFD is 64A, which is slightly lower than the original's 72A but remains suitable for many high-power scenarios. It employs a Super Junction Multi-EPI process, targeting similar high-efficiency performance.
Key Application Areas:
Original Model STW75N60M6: Its high voltage rating, very low RDS(on), and high current capability make it ideal for demanding high-power applications.
Switched-Mode Power Supplies (SMPS): PFC (Power Factor Correction) stages, hard-switched and resonant converters (e.g., LLC) in server, telecom, and industrial power supplies.
Motor Drives & Inverters: High-power motor control in industrial automation, HVAC, and automotive applications.
Solar Inverters & UPS: Power switching stages requiring high efficiency and reliability.
Alternative Model VBP16R64SFD: With its closely matched electrical parameters and package compatibility, it is a viable alternative for the same high-voltage, high-power applications mentioned above, especially where supply chain diversification or cost optimization is a priority, provided the slightly lower current rating is acceptable for the design.
Comparative Analysis: STF28NM50N (500V N-channel) vs. VBMB15R24S
This comparison focuses on a 500V MOSFET designed for efficient medium-power conversion, where the balance between conduction loss, switching performance, and package is key.
Analysis of the Original Model (STF28NM50N) Core:
This STMicroelectronics device is a 500V N-channel MOSFET using the second-generation MDmesh technology in a TO-220FP (isolated) package. Its core advantages are:
Optimized Technology: The MDmesh V structure combines a vertical layout with strip design, achieving a good trade-off between low gate charge (Qg) and low on-resistance (135mΩ @10V).
Reliable Performance: With a continuous current rating of 21A, it is suited for medium-power applications.
Package Advantage: The TO-220FP package offers good thermal performance with isolation, simplifying heatsink mounting in many systems.
Compatibility and Differences of the Domestic Alternative (VBMB15R24S):
VBsemi's VBMB15R24S is offered in a standard TO-220F package and serves as a functional alternative. It shows a performance-enhanced profile in key parameters: same 500V voltage rating, but a higher continuous current of 24A and a lower on-resistance of 120mΩ @10V compared to the original's 135mΩ. This indicates potential for lower conduction losses and higher efficiency or power density in similar applications.
Key Application Areas:
Original Model STF28NM50N: Its balanced performance makes it a solid choice for various medium-power, high-efficiency converters.
SMPS & DC-DC Converters: Main switches or synchronous rectifiers in offline power supplies (e.g., adapters, LED drivers) and industrial converters.
Lighting: Electronic ballasts and LED driving circuits.
Appliance Motor Control: Drives for fans, pumps, and compressors in home appliances.
Alternative Model VBMB15R24S: With its superior current rating and lower on-resistance, it is well-suited for upgraded scenarios or new designs requiring higher efficiency, higher output current, or better thermal performance within the same 500V class. It is an excellent choice for demanding medium-power applications.
Conclusion
In summary, this analysis reveals two distinct selection pathways for high-voltage MOSFETs:
For 600V high-power applications like server PSUs and industrial motor drives, the original STW75N60M6, with its very low 32mΩ typical RDS(on) and high 72A current capability, sets a high-performance benchmark. Its domestic alternative VBP16R64SFD offers a highly compatible solution with identical voltage and RDS(on) ratings and a substantial 64A current, presenting a reliable and cost-effective alternative for many designs in this segment.
For 500V medium-power applications focusing on efficiency and cost-effectiveness, such as adapters and appliance controls, the original STF28NM50N provides a proven, balanced performance with its MDmesh V technology. The domestic alternative VBMB15R24S emerges as a performance-enhanced option, offering a higher current rating (24A vs. 21A) and a significantly lower on-resistance (120mΩ vs. 135mΩ), making it an attractive choice for designs seeking higher power density or lower losses.
The core takeaway is that selection is driven by precise requirement matching. In the context of supply chain diversification, domestic alternatives like VBP16R64SFD and VBMB15R24S not only provide viable backup options but also demonstrate competitive or even superior performance in specific parameters, offering engineers greater flexibility and resilience in design trade-offs and cost management. A deep understanding of each device's specifications and design philosophy is essential to fully leverage its value in the circuit.