In high-voltage power conversion and motor drive applications, selecting a MOSFET that balances voltage rating, current capability, and switching efficiency is a critical engineering challenge. This involves careful trade-offs among performance, thermal management, cost, and supply chain stability. This article takes two representative high-voltage MOSFETs—AOTF15S60L (in TO-220F) and AOK160A60 (in TO-247)—as benchmarks, analyzes their design focus and application scenarios, and evaluates two domestic alternative solutions, VBMB16R15S and VBP16R20S. By clarifying parameter differences and performance orientations, we provide a clear selection map to help you find the most suitable power switching solution for your next high-voltage design.
Comparative Analysis: AOTF15S60L (N-channel, TO-220F) vs. VBMB16R15S
Analysis of the Original Model (AOTF15S60L) Core:
This is a 600V N-channel MOSFET from AOS in a TO-220F package. Its design focuses on reliable high-voltage switching with moderate current handling in a cost-effective, industry-standard package. Key advantages include: a 600V drain-source voltage rating, a continuous drain current of 15A, and an on-resistance of 254mΩ at 10V gate drive. It offers a robust balance for offline power supplies and motor drives where 600V withstand capability is essential.
Compatibility and Differences of the Domestic Alternative (VBMB16R15S):
VBsemi's VBMB16R15S is a direct pin-to-pin compatible alternative in the same TO-220F package. The main differences are in electrical parameters: it offers the same 600V voltage rating and 15A continuous current, but with a slightly higher on-resistance of 280mΩ at 10V. This makes it a highly suitable replacement where the primary requirement is voltage rating and package compatibility, with a minor trade-off in conduction loss.
Key Application Areas:
Original Model AOTF15S60L: Ideal for 600V-rated applications requiring 15A current capability in a standard TO-220F package. Typical uses include:
Switched-Mode Power Supplies (SMPS): PFC stages, flyback, or forward converters.
Motor Drives: Inverters for appliances, fans, and pumps.
Industrial Controls: Relays, contactors, and solenoid drivers.
Alternative Model VBMB16R15S: Best suited as a direct replacement in the same 600V/15A application scenarios where the slight increase in RDS(on) is acceptable, offering a reliable domestic alternative with good compatibility.
Comparative Analysis: AOK160A60 (N-channel, TO-247) vs. VBP16R20S
This comparison shifts to higher-power applications where the TO-247 package provides superior thermal performance.
Analysis of the Original Model (AOK160A60) Core:
This AOS MOSFET in a TO-247 package is designed for higher-current 600V applications. Its core advantages are:
High Current Capability: A continuous drain current of 24A.
Low On-Resistance: 160mΩ at 10V gate drive, reducing conduction losses.
Robust Package: The TO-247 package offers excellent thermal dissipation for higher power levels.
Compatibility and Differences of the Domestic Alternative (VBP16R20S):
VBsemi's VBP16R20S is a pin-to-pin compatible alternative in the TO-247 package. It matches the original's 600V rating and key on-resistance of 160mΩ at 10V. The main difference is a slightly lower continuous current rating of 20A compared to the original's 24A. This makes it a strong performance-matched alternative for many applications where the full 24A is not utilized, offering a very similar efficiency and thermal profile.
Key Application Areas:
Original Model AOK160A60: Suited for 600V applications demanding higher current up to 24A, such as:
High-Power SMPS: PFC, half-bridge, or full-bridge topologies.
Motor Drives: Inverters for larger industrial motors, air conditioners, and power tools.
UPS and Solar Inverters: Power switching stages.
Alternative Model VBP16R20S: An excellent alternative for 600V applications where 20A current is sufficient and the low 160mΩ RDS(on) is critical. It provides a high-performance domestic option for efficient power conversion and motor drive circuits.
Conclusion:
This analysis reveals two clear substitution paths for high-voltage MOSFETs:
For 600V/15A applications in the TO-220F package, the original AOTF15S60L provides a reliable balance of voltage, current, and conduction loss (254mΩ). Its domestic alternative VBMB16R15S offers direct compatibility with a slightly higher RDS(on) (280mΩ), serving as a viable replacement where the minor efficiency trade-off is acceptable.
For higher-power 600V applications in the TO-247 package, the original AOK160A60 delivers robust performance with 24A current and 160mΩ on-resistance. The domestic alternative VBP16R20S stands out as a near-performance match, offering the same low 160mΩ RDS(on) and a 20A current rating, making it a strong candidate for upgrade or direct replacement in designs that do not require the full 24A.
The core takeaway is that selection depends on precise requirement matching. In the context of supply chain diversification, these domestic alternatives provide not only feasible backup options but also competitive performance in key parameters, giving engineers greater flexibility and resilience in design trade-offs and cost control. Understanding each device's specifications is essential to leverage its full value in the circuit.