In modern power design, balancing high-current handling, thermal performance, and board space is a critical engineering challenge. Selecting the right MOSFET involves careful trade-offs among current capability, switching efficiency, package size, and supply chain flexibility. This article takes two representative MOSFETs from Nexperia—the high-power BUK7628-100A,118 (N-channel) and the compact BUK6D56-60EX (N-channel)—as benchmarks. We will deeply analyze their design focus and application scenarios, and compare them with two domestic alternative solutions: VBL1102N and VBQG1620. By clarifying parameter differences and performance orientations, we provide a clear selection guide to help you find the optimal power switching solution in your next design.
Comparative Analysis: BUK7628-100A,118 (N-channel) vs. VBL1102N
Analysis of the Original Model (BUK7628-100A,118) Core:
This is a 100V N-channel MOSFET from Nexperia in a robust D2PAK (TO-263) package. Its design core is to deliver high-current switching capability with reliable thermal performance in high-power applications. Key advantages include: a high continuous drain current rating of 47A and an on-resistance (RDS(on)) of 28mΩ measured at 10V, 25A. This combination makes it suitable for circuits requiring substantial current handling with moderate conduction losses.
Compatibility and Differences of the Domestic Alternative (VBL1102N):
VBsemi's VBL1102N is also offered in a TO-263 package and serves as a pin-to-pin compatible alternative. The key differences are in the electrical parameters: VBL1102N features a significantly lower on-resistance of 20mΩ (@10V) and a higher continuous drain current rating of 70A, while maintaining the same 100V drain-source voltage rating. This represents a substantial performance enhancement in both conduction loss and current capacity.
Key Application Areas:
Original Model BUK7628-100A,118: Ideal for high-power applications where robust current delivery (up to 47A) and a 100V rating are required. Typical uses include:
High-current DC-DC converters and voltage regulators.
Motor drives for industrial equipment or electric vehicles.
Power switches in UPS systems and inverters.
Alternative Model VBL1102N: Better suited for upgraded scenarios demanding even higher efficiency and current capability. Its 70A rating and lower 20mΩ RDS(on) make it an excellent choice for next-generation high-power designs, such as:
High-efficiency synchronous rectification in server power supplies.
High-performance motor controllers requiring lower thermal dissipation.
Any application seeking to reduce conduction losses and increase power density within the same footprint.
Comparative Analysis: BUK6D56-60EX (N-channel) vs. VBQG1620
This comparison shifts focus to compact, space-constrained applications. The design pursuit for this N-channel MOSFET is achieving a balance of adequate current handling, voltage rating, and minimal footprint.
Analysis of the Original Model (BUK6D56-60EX) Core:
This is a 60V N-channel MOSFET from Nexperia in a compact DFN-6-MD (2x2) package. Its core advantages are:
Space-Saving Design: The tiny DFN2020MD-6 (SOT1220) package is ideal for densely populated PCBs.
Balanced Performance: It offers an 11A continuous current and an on-resistance of 56mΩ (@10V, 4A), providing a solid solution for medium-power switching in a minimal space.
Compatibility and Differences of the Domestic Alternative (VBQG1620):
VBsemi's VBQG1620 is a direct pin-to-pin compatible alternative in the same DFN6(2x2) package. It offers a significant performance upgrade: a much lower on-resistance of 19mΩ (@10V) and a higher continuous drain current of 14A, while maintaining the same 60V voltage rating.
Key Application Areas:
Original Model BUK6D56-60EX: Its compact size and 60V/11A rating make it suitable for space-limited, medium-power applications. For example:
Load switches and power management in telecom/network equipment.
DC-DC conversion in automotive subsystems.
Motor drive circuits in portable or compact devices.
Alternative Model VBQG1620: Ideal for designs where the compact footprint is mandatory but performance cannot be compromised. Its enhanced 14A current and low 19mΩ RDS(on) make it perfect for:
High-density point-of-load (PoL) converters requiring higher efficiency.
Advanced battery management systems (BMS).
Upgrading existing designs to achieve lower losses and better thermal performance without changing the PCB layout.
Conclusion
In summary, this analysis reveals two distinct upgrade paths facilitated by domestic alternatives:
For high-power applications using the D2PAK package, the original BUK7628-100A,118 provides a reliable 47A, 100V solution. Its domestic alternative VBL1102N offers a compelling performance-enhanced option, with superior current handling (70A) and significantly lower conduction loss (20mΩ), enabling more efficient and powerful designs in the same form factor.
For compact, medium-power applications using the DFN package, the original BUK6D56-60EX delivers a balanced 60V/11A performance in a minimal footprint. Its domestic alternative VBQG1620 provides a direct upgrade, offering higher current (14A) and dramatically lower on-resistance (19mΩ), which translates to better efficiency and thermal performance without increasing board space.
The core takeaway is that selection is about precise requirement matching. In the context of supply chain diversification, domestic alternatives like VBL1102N and VBQG1620 not only provide reliable backup options but also offer significant performance gains in key parameters. This gives engineers greater flexibility, resilience, and potential for design optimization in their power management solutions.