MOSFET Selection for High-Voltage Power Applications: STB36NM60N, STF28NM60ND vs. China Alternatives VBL16R31SFD, VBMB16R20S
Comparative Analysis: STB36NM60N (N-channel) vs. VBL16R31SFD
Analysis of the Original Model (STB36NM60N) Core:
This is a 600V N-channel Automotive Grade MOSFET from STMicroelectronics, in a D2PAK (TO-263) package. Its design core is to provide robust high-voltage switching with high current capability. Key advantages are: a drain-source voltage (Vdss) of 600V, a continuous drain current (Id) of 29A, and a low on-resistance (RDS(on)) of 105mΩ at 10V gate drive. It features ST's MDmesh II technology for optimized switching performance and efficiency in high-power applications.
Compatibility and Differences of the Domestic Alternative (VBL16R31SFD):
VBsemi's VBL16R31SFD is offered in a TO-263 package and serves as a pin-to-pin compatible alternative. The main differences in electrical parameters: VBL16R31SFD has a similar 600V voltage rating and a slightly lower continuous current rating of 31A. However, it offers a significantly improved on-resistance of 90mΩ at 10V, which can lead to lower conduction losses.
Key Application Areas:
Original Model STB36NM60N: Its automotive-grade qualification and balanced parameters make it suitable for demanding high-voltage applications. Typical applications include:
- Automotive systems: DC-DC converters, motor drives, and other high-power switching in 48V or higher voltage systems.
- Industrial power supplies: Switch-mode power supplies (SMPS), PFC stages.
- High-power inverters and motor controls.
Alternative Model VBL16R31SFD: With its lower on-resistance, it is well-suited for upgrade scenarios where higher efficiency and reduced heat dissipation are critical, while maintaining the high voltage robustness, such as in next-generation high-density power supplies or enhanced motor drives.
Comparative Analysis: STF28NM60ND (N-channel) vs. VBMB16R20S
Analysis of the Original Model (STF28NM60ND) Core:
This is a 600V N-channel MOSFET from STMicroelectronics, in a TO-220FP package. It is designed for high-voltage applications where through-hole mounting is preferred. Its key parameters are a drain-source voltage of 600V, a continuous drain current of 23A, and an on-resistance of 150mΩ at 10V gate drive. The package offers good thermal performance for medium-power applications.
Compatibility and Differences of the Domestic Alternative (VBMB16R20S):
VBsemi's VBMB16R20S is offered in a TO-220F package and serves as a direct functional and form-factor alternative. The main parameter differences: VBMB16R20S has the same 600V voltage rating. Its continuous drain current is rated at 20A, and it matches the original part's on-resistance of 150mΩ at 10V. This provides a highly equivalent performance profile.
Key Application Areas:
Original Model STF28NM60ND: Its characteristics make it a reliable choice for various high-voltage, medium-current applications. Typical uses include:
- Industrial motor drives: For controlling AC motors, servo drives.
- Power supplies: As the main switch in offline flyback or forward converters.
- Lighting: High-voltage LED drivers, ballast controls.
Alternative Model VBMB16R20S: As a performance-matched alternative, it is suitable for the same application spectrum, offering a reliable domestic source for designs requiring the TO-220FP form factor and 600V capability, such as in cost-sensitive yet performance-conscious industrial and consumer power stages.
In summary, this comparative analysis reveals two clear selection paths:
For high-voltage, high-current applications requiring an automotive-grade D2PAK MOSFET, the original model STB36NM60N, with its 29A current rating and 105mΩ on-resistance, offers a proven solution for automotive and industrial power stages. Its domestic alternative VBL16R31SFD provides a compelling upgrade path with a lower 90mΩ on-resistance, enabling higher efficiency and potentially cooler operation in similar 600V circuits.
For high-voltage, medium-current applications utilizing the TO-220FP package, the original model STF28NM60ND provides a solid balance of 600V withstand, 23A current, and 150mΩ on-resistance. Its domestic alternative VBMB16R20S delivers nearly identical electrical performance (20A, 150mΩ), serving as a reliable drop-in replacement for supply chain diversification.
The core conclusion is: Selection depends on precise requirement matching. For an efficiency upgrade in D2PAK packages, VBL16R31SFD is a strong candidate. For a direct replacement in TO-220FP packages, VBMB16R20S offers a viable alternative. These domestic models provide engineers with flexible, resilient options for design trade-offs and cost control in high-voltage power applications.