In today's pursuit of device miniaturization and high efficiency, selecting the 'just right' MOSFET for a compact circuit board is a key challenge for engineers. It's a precise balance of performance, size, cost, and supply chain resilience. This article uses two representative MOSFETs, AON6282 (N-channel) and AO7415 (P-channel), as benchmarks, analyzes their design cores, and evaluates the domestic alternatives VBGQA1805 and VBK8238. We aim to provide a clear selection map for your next power switching solution.
Comparative Analysis: AON6282 (N-channel) vs. VBGQA1805
Analysis of the Original Model (AON6282) Core:
This is an 80V N-channel MOSFET from AOS in a DFN-8 (5x6) package. Its design core is delivering high current and low loss in a medium-footprint package. Key advantages are a high continuous drain current (85A at Tc, 26.5A at Ta) and a low on-resistance of 5.6mΩ at 10V gate drive, enabling efficient power handling with minimal conduction loss.
Compatibility and Differences of the Domestic Alternative (VBGQA1805):
VBsemi's VBGQA1805 is a pin-to-pin compatible alternative in a similar DFN8(5x6) package. It offers a comparable voltage rating (85V) and surpasses the original in key parameters: a lower on-resistance of 4.5mΩ at 10V and a high continuous current rating of 80A, indicating potentially lower conduction loss and robust current handling.
Key Application Areas:
Original Model AON6282: Ideal for medium to high-power applications requiring high efficiency and current capability in 48V-80V systems.
Synchronous rectification in high-current DC-DC converters (e.g., for servers, telecom).
Motor drives for power tools, e-bikes.
High-side or low-side switches in robust power management units.
Alternative Model VBGQA1805: Suited for the same applications as AON6282 but offers a performance-enhanced option where lower RDS(on) and high current (80A) are critical for maximizing efficiency and power density, especially in demanding thermal environments.
Comparative Analysis: AO7415 (P-channel) vs. VBK8238
This P-channel MOSFET focuses on providing a compact, efficient switching solution for low-voltage, space-constrained applications.
Analysis of the Original Model (AO7415) Core:
This is a -20V P-channel MOSFET from AOS in an ultra-small SC-70-6 package. Its core advantage is integrating a reasonable current rating (2A) and on-resistance (100mΩ @ 10V) into a minimal footprint, perfect for signal-level or low-power switching where board space is premium.
Compatibility and Differences of the Domestic Alternative (VBK8238):
VBsemi's VBK8238 is a direct pin-to-pin compatible alternative in the same SC70-6 package. It offers a significant performance upgrade: a much lower on-resistance of 34mΩ at 4.5V gate drive and a higher continuous current rating of -4A, while maintaining the same -20V voltage rating.
Key Application Areas:
Original Model AO7415: Excellent for space-critical, low-power control applications.
Load switches and power rail control in portable/IoT devices.
Level translation and interface switching.
Power management in battery-operated gadgets.
Alternative Model VBK8238: Targets the same compact applications as AO7415 but is superior for scenarios requiring lower voltage drop, higher efficiency, or the ability to handle higher load currents (up to 4A) within the same tiny footprint.
Conclusion
This analysis reveals two distinct selection paths:
For N-channel applications demanding high current and efficiency, the original AON6282 offers a strong balance of 80V rating, 85A current, and 5.6mΩ RDS(on). Its domestic alternative VBGQA1805 provides a compelling "performance-enhanced" option with even lower RDS(on) (4.5mΩ) and high current (80A), ideal for upgrading efficiency and power density.
For P-channel applications in ultra-compact spaces, the original AO7415 is a proven solution for low-power switching. Its domestic alternative VBK8238 stands out as a "superior drop-in" replacement, offering significantly better conduction (34mΩ vs. 100mΩ) and higher current capacity (-4A vs. -2A) in the identical package.
The core takeaway: Selection is about precise requirement matching. In the context of supply chain diversification, domestic alternatives like VBGQA1805 and VBK8238 not only provide reliable backup but often deliver parameter advantages, giving engineers more flexible and resilient choices for design optimization and cost control. Understanding each device's design philosophy is key to unlocking its full value in your circuit.