In high-performance switch-mode power supply (SMPS) applications, particularly in synchronous rectification stages, Infineon's BSZ028N04LS N-channel MOSFET has been a benchmark choice for engineers, valued for its extremely low on-resistance, avalanche ruggedness, and excellent thermal performance. However, navigating global supply chain uncertainties and seeking cost optimization drive the imperative for reliable, high-performance domestic alternatives. Addressing this need, VBsemi introduces the VBQF1402, a meticulously engineered drop-in replacement that not only matches but surpasses the BSZ028N04LS, offering enhanced performance, guaranteed supply, and localized support.
Direct Parameter Superiority and Performance Headroom for Demanding Applications
Engineered as a direct alternative to the BSZ028N04LS, the VBQF1402 delivers significant advancements in key electrical specifications, providing greater design margin and efficiency:
Higher Current Handling: The continuous drain current (Id) is elevated to 60A, a substantial 50% increase over the original 40A. This allows for handling higher power levels or providing increased reliability and cooler operation at existing power levels.
Lower Conduction Losses: It features an ultra-low on-resistance (RDS(on)) of just 2mΩ at VGS=10V, outperforming the BSZ028N04LS's 2.8mΩ. This reduction directly minimizes conduction losses, boosting overall system efficiency and reducing thermal management demands.
Robust Voltage Ratings: With a drain-source voltage (VDS) of 40V and a gate-source voltage (VGS) rating of ±20V, it ensures stable operation and strong gate noise immunity in synchronous rectifier and other low-voltage, high-current switching environments.
Optimized Threshold: The 3V gate threshold voltage (Vth) ensures reliable switching and compatibility with standard driver ICs.
Advanced Trench Technology for Enhanced Reliability and Switching Performance
The VBQF1402 utilizes advanced Trench technology, building upon the core strengths of the original part. It achieves the remarkably low RDS(on) while optimizing switching characteristics and ruggedness:
It is designed and tested for high reliability, including 100% avalanche testing, ensuring robustness against voltage spikes and inductive switching events common in SMPS designs.
The technology enables excellent thermal resistance performance, crucial for maintaining device longevity and stability in high-power-density applications.
It complies with JEDEC standards for the target applications and adheres to RoHS and halogen-free standards (per IEC61249-2-21), meeting modern environmental and safety requirements.
Package Compatibility for Seamless, Risk-Free Replacement
The VBQF1402 comes in a DFN8 (3x3) package, designed for direct footprint compatibility with the BSZ028N04LS in typical layouts. This allows for a true "drop-in" replacement, eliminating the need for PCB redesign, re-validation of thermal management, or mechanical adjustments. Engineers can swiftly qualify and integrate the VBQF1402, drastically reducing the time, cost, and risk associated with component substitution.
Localized Supply Chain and Technical Support Assurance
VBsemi provides a stable and responsive supply chain for the VBQF1402, free from the volatility of international logistics and trade policies. With short, reliable lead times and local inventory potential, it safeguards production continuity. Backed by a local technical support team, VBsemi offers prompt assistance, comprehensive documentation (including substitution guides and application notes), and tailored solutions, ensuring a smooth and supported transition from the BSZ028N04LS.
From server and telecom SMPS to synchronous rectification in DC-DC converters and motor drives, the VBQF1402 stands as the intelligent choice for replacing the BSZ028N04LS. It delivers superior electrical performance, proven reliability, seamless integration, and the security of a local supplier—enabling designers to enhance their products' competitiveness while mitigating supply chain risk.