In modern power design, selecting the optimal MOSFET requires balancing performance, size, cost, and supply chain stability. This article takes two classic MOSFETs—AO4453 (P-channel) and AOT2618L (N-channel)—as benchmarks, analyzes their design cores and application scenarios, and evaluates two domestic alternative solutions, VBA2107 and VBM1615. By comparing parameter differences and performance orientations, we provide a clear selection guide to help you find the most suitable power switching solution.
Comparative Analysis: AO4453 (P-channel) vs. VBA2107
Analysis of the Original Model (AO4453) Core:
This is a 12V P-channel MOSFET from AOS in an SOIC-8 package. Its design focuses on efficient power switching in standard footprint applications. Key advantages include: an on-resistance of 25mΩ at 4.5V gate drive, a continuous drain current of 9A, a threshold voltage of 900mV, and low input capacitance (1.37nF), enabling good switching performance with moderate drive requirements.
Compatibility and Differences of the Domestic Alternative (VBA2107):
VBsemi’s VBA2107 is a pin-to-pin compatible alternative in SOP8 package. It offers significantly improved electrical parameters: lower on-resistance of 5mΩ at 4.5V, higher continuous current (-16A), and a lower threshold voltage (-0.8V). The voltage rating remains -12V with ±8V gate tolerance.
Key Application Areas:
- Original Model AO4453: Suitable for 12V system load switching, power management, and DC-DC conversion where moderate current (up to 9A) and standard packaging are required.
- Alternative Model VBA2107: Ideal for applications demanding lower conduction loss, higher current capability (up to -16A), and faster switching, such as enhanced load switches, motor drives, or compact power modules in 12V systems.
Comparative Analysis: AOT2618L (N-channel) vs. VBM1615
Analysis of the Original Model (AOT2618L) Core:
This is a 60V N-channel MOSFET from AOS in a TO-220 package. It is designed for medium-power applications requiring robust performance. Key features include: an on-resistance of 19mΩ at 10V gate drive, continuous drain current of 23A (or 7A under certain conditions), and good switching characteristics for power conversion.
Compatibility and Differences of the Domestic Alternative (VBM1615):
VBsemi’s VBM1615 is a direct alternative in TO-220 package with enhanced performance. It offers lower on-resistance (11mΩ at 10V), much higher continuous current (60A), and a threshold voltage of 1.7V. The voltage rating remains 60V with ±20V gate tolerance.
Key Application Areas:
- Original Model AOT2618L: Well-suited for 48V-60V system applications such as DC-DC synchronous rectification, motor drives, and medium-power switching where 23A current and TO-220 heat dissipation are adequate.
- Alternative Model VBM1615: Excellent for high-current, high-efficiency applications requiring lower conduction loss and higher power handling, such as high-power DC-DC converters, motor controllers, or industrial power systems up to 60V.
Summary:
This comparison reveals two clear selection paths:
- For P-channel applications in standard packages, the original AO4453 provides reliable performance for 12V systems up to 9A. Its domestic alternative VBA2107 offers a performance upgrade with lower on-resistance (5mΩ) and higher current (-16A), making it a strong choice for efficiency-critical designs.
- For N-channel applications in medium-power ranges, the original AOT2618L delivers solid performance with 19mΩ on-resistance and 23A current. The domestic alternative VBM1615 significantly enhances performance with 11mΩ on-resistance and 60A current, ideal for demanding high-power scenarios.
The core conclusion is that selection depends on precise requirement matching. Domestic alternatives not only provide reliable backup options but also offer performance advantages in key parameters, giving engineers greater flexibility in design trade-offs and cost control. Understanding each device’s design philosophy and parameters is essential to maximize its value in the circuit.