In modern power design, selecting the right MOSFET is a critical task that balances performance, size, cost, and supply chain stability. This article takes two representative MOSFETs—AON7246E (N-channel) and AO4268 (N-channel)—as benchmarks, analyzes their design focus and application scenarios, and evaluates two domestic alternative solutions: VBQF1615 and VBA1615. By comparing their parameter differences and performance orientations, we provide a clear selection guide to help you find the most suitable power switching solution for your next project.
Comparative Analysis: AON7246E (N-channel) vs. VBQF1615
Analysis of the Original Model (AON7246E) Core:
This is a 60V N-channel MOSFET from AOS in a compact DFN-8-EP (3x3) package. Its design focuses on efficient power switching in space-constrained applications. Key advantages include a low on-resistance of 10.7mΩ at 10V gate drive and a continuous drain current rating of 13A. The device offers a good balance of switching performance and thermal efficiency for medium-power circuits.
Compatibility and Differences of the Domestic Alternative (VBQF1615):
VBsemi’s VBQF1615 is offered in a similar DFN8 (3x3) package and serves as a pin-to-pin compatible alternative. Electrically, it matches the 60V voltage rating and provides comparable on-resistance: 10mΩ at 10V. The continuous current rating is slightly higher at 15A, offering a marginal performance uplift in current handling.
Key Application Areas:
- Original Model AON7246E: Ideal for 48V–60V systems requiring compact size and moderate current capability, such as:
- DC-DC converters in industrial power supplies.
- Motor drive circuits in robotics or small automotive modules.
- Load switching in telecom or networking equipment.
- Alternative Model VBQF1615: Suitable for similar applications where a domestic alternative with equivalent or slightly better current rating is preferred, providing a reliable drop-in replacement with good efficiency.
Comparative Analysis: AO4268 (N-channel) vs. VBA1615
Analysis of the Original Model (AO4268) Core:
The AO4268 from AOS is an N-channel MOSFET in SOIC-8 package, emphasizing low conduction loss and robust performance. Its standout features include a very low on-resistance of 4.8mΩ at 10V and a high continuous current rating of 19A. With a threshold voltage of 2.3V, it ensures easy drive compatibility in standard logic-level circuits.
Compatibility and Differences of the Domestic Alternative (VBA1615):
VBsemi’s VBA1615 is offered in SOP8 package, providing a form-factor compatible alternative. It maintains the same 60V voltage rating but differs in key parameters: on-resistance is 12mΩ at 10V, and continuous current is rated at 12A. While its conduction performance is slightly lower than the original, it remains a viable option for cost-sensitive designs with moderate current demands.
Key Application Areas:
- Original Model AO4268: Excels in high-efficiency, medium-to-high current applications such as:
- Synchronous rectification in 48V DC-DC converters.
- Power management in server, storage, or communication hardware.
- Motor drives for industrial tools or automotive systems.
- Alternative Model VBA1615: Best suited for applications where cost optimization is critical and the full current capability of the original is not required, such as:
- Lower-power DC-DC modules.
- Switching circuits in consumer power adapters.
- General-purpose load switching within its current range.
Conclusion
This comparison highlights two distinct selection paths:
- For compact, medium-power designs using DFN packages, the AON7246E offers a solid blend of low RDS(on) and good current handling. Its domestic alternative VBQF1615 provides a compatible, performance-similar option with slight current advantage.
- For higher-current applications using SOIC/SOP packages, the AO4268 delivers excellent efficiency with very low RDS(on) and high current capability. The domestic alternative VBA1615 offers a cost-effective replacement for designs where moderate current and voltage ratings are sufficient.
The core insight is that selection depends on precise requirement matching. Domestic alternatives not only supply chain resilience but also offer parameter-specific enhancements or cost benefits, giving engineers greater flexibility in design trade-offs. Understanding each device’s design intent and parameter implications is key to maximizing circuit performance and value.