In modern power design, selecting the optimal MOSFET involves balancing performance, footprint, cost, and supply chain stability. This analysis uses two established MOSFETs—PMPB100XPEAX (P-channel) and BUK965R4-40E,118 (N-channel)—as benchmarks, comparing them with domestic alternatives VBQG8238 and VBL1402. We will clarify key parameter differences and application suitability to provide a clear selection guide for your next power switching solution.
Comparative Analysis: PMPB100XPEAX (P-channel) vs. VBQG8238
Analysis of the Original Model (PMPB100XPEAX) Core:
This is a 20V P-channel MOSFET from Nexperia in a compact DFN-6 (2x2) package. It is designed for space-constrained, low-to-medium power switching. Key features include a continuous drain current (Id) of 3.2A and an on-resistance (RDS(on)) of 122mΩ at 4.5V gate drive. Its trench MOSFET technology in a small SMD package makes it suitable for efficient power management where board space is limited.
Compatibility and Differences of the Domestic Alternative (VBQG8238):
VBsemi's VBQG8238 is a pin-to-pin compatible alternative in a DFN6(2x2) package. It offers significantly improved conduction performance: a lower on-resistance of 30mΩ at 4.5V and a higher continuous current rating of -10A. While the voltage rating (-20V) is similar, the VBQG8238 provides substantially better current handling and lower conduction loss.
Key Application Areas:
Original Model PMPB100XPEAX: Ideal for compact 20V system applications requiring moderate current switching (~3.2A), such as load switches in portable electronics, power management in IoT devices, or as a high-side switch in miniaturized DC-DC converters.
Alternative Model VBQG8238: Better suited for P-channel applications demanding higher current capacity (up to 10A) and lower on-resistance in a similarly compact footprint. It is an excellent upgrade for designs needing improved efficiency and power handling within the same voltage range.
Comparative Analysis: BUK965R4-40E,118 (N-channel) vs. VBL1402
Analysis of the Original Model (BUK965R4-40E,118) Core:
This is a robust 40V N-channel MOSFET from Nexperia in a D2PAK (TO-263) package, designed for high-current applications. Its core strengths are a very low on-resistance of 4.3mΩ at 5V and an impressive continuous drain current rating of 75A. This combination minimizes conduction losses and is suited for high-power switching.
Compatibility and Differences of the Domestic Alternative (VBL1402):
VBsemi's VBL1402, in a TO-263 package, is a high-performance alternative. It matches the 40V voltage rating but offers even lower on-resistance: 2.5mΩ at 4.5V and 2mΩ at 10V. Its continuous current rating is dramatically higher at 150A. This represents a major performance enhancement for ultra-high-current applications.
Key Application Areas:
Original Model BUK965R4-40E,118: A strong choice for high-current 40V systems such as motor drives, high-power DC-DC converters (synchronous rectification), and power distribution in industrial or automotive applications where 75A capability is required.
Alternative Model VBL1402: Targets the most demanding high-power scenarios. With its ultra-low 2mΩ RDS(on) and massive 150A current rating, it is ideal for next-generation high-efficiency power supplies, advanced motor controllers, and any application where minimizing loss and maximizing current throughput are critical.
Conclusion:
This comparison reveals two distinct upgrade paths with the domestic alternatives:
1. For P-channel applications in compact designs, VBQG8238 offers a direct footprint-compatible upgrade to PMPB100XPEAX, providing significantly lower on-resistance and higher current capability for improved efficiency and power density.
2. For high-power N-channel applications, VBL1402 surpasses BUK965R4-40E,118 in key metrics, offering drastically lower RDS(on) and double the current rating, enabling higher efficiency and power handling in demanding circuits like motor drives and high-current converters.
The core takeaway is precise requirement matching. In the context of supply chain diversification, these domestic alternatives (VBQG8238, VBL1402) not only provide reliable compatibility but also deliver substantial performance gains, offering engineers enhanced flexibility and resilience in design and cost optimization.