Introduction
Power MOSFETs are the crucial "switches" controlling energy flow in modern electronic devices. For a long time, international brands like ROHM have dominated the market with their classic products, such as the RSQ035N06HZGTR. However, global supply chain volatility and the need for technological autonomy have made seeking reliable, high-performance domestic alternatives a strategic necessity. Represented by VBsemi's VB7638, domestic components are now achieving direct substitution and even surpassing international classics.
Part 1: Analysis of the Classic Component
ROHM's RSQ035N06HZGTR is a low-voltage N-channel MOSFET (60V, 3.5A) with an on-resistance of 70mΩ at 10V. It utilizes a compact SOT23-6 package and is widely used in applications such as power management, motor drives, and portable devices, valued for its reliability and efficiency in space-constrained designs.
Part 2: Performance Surpassing by the Domestic Challenger
VBsemi's VB7638 directly substitutes the RSQ035N06HZGTR and offers improvements in key parameters:
Higher Current Capability: Continuous drain current reaches 7A (an increase of 3.5A), enabling greater power handling and design flexibility.
Lower Conduction Loss: On-resistance is as low as 30mΩ at 10V (a significant reduction from 70mΩ), minimizing conduction losses and boosting system efficiency.
Full Compatibility: Features a pin-compatible SOT23-6 package (Single-N configuration), allowing seamless replacement without PCB modifications.
The device is built on advanced Trench technology, ensuring robust performance and stability.
Part 3: Core Value Beyond Specifications
Choosing a domestic alternative brings deeper advantages:
Ensuring Supply Chain Security: Reduces reliance on international suppliers, mitigating risks and ensuring production continuity.
Optimizing Overall Cost: Provides cost-effective performance, potentially lowering system expenses through improved efficiency and reduced thermal management needs.
Accessing Rapid Local Support: Domestic suppliers offer responsive technical assistance and tailored solutions for specific application scenarios.
Boosting the Industrial Ecosystem: Each successful adoption strengthens the domestic semiconductor sector, fostering innovation and a virtuous development cycle.
Part 4: A Robust Path for Substitution Implementation
For a smooth transition, follow these steps:
Detailed Specification Comparison: Carefully assess all electrical parameters, including VDS (60V), VGS (±20V), Vth (1.7V), and switching characteristics.
Rigorous Laboratory Testing: Perform static and dynamic tests, efficiency measurements, and reliability stress tests under real-world conditions.
Small-Batch Pilot Verification: Trial the VB7638 in actual products to validate long-term performance and compatibility.
Develop a Switchover and Backup Plan: Gradually implement the substitution after verification, while retaining the original design as a short-term backup.
Conclusion: Moving from "Usable" to "Excellent"
The evolution from the RSQ035N06HZGTR to the VB7638 showcases how domestic power semiconductors can rival and exceed international benchmarks. Adopting such high-performance domestic components is not only a practical response to supply chain challenges but also a strategic step toward building an autonomous, resilient, and innovative industrial future. Now is the opportune moment to actively evaluate and integrate high-quality domestic solutions like the VB7638.