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 RTQ035N03TR. 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 VB7322, domestic components are now achieving direct对标and even surpassing international classics.
Part 1: Analysis of the Classic Component
ROHM's RTQ035N03TR is a low-voltage MOSFET (30V, 3.5A) featuring low on-resistance (54mΩ@4.5V). It incorporates a built-in G-S protection diode and comes in a compact surface-mount TSMT6 package. With lead-free plating and RoHS compliance, it is widely used in switching applications, serving as a standard choice for many designs.
Part 2: Performance Surpassing by the Domestic Challenger
VBsemi's VB7322 directly对标s the RTQ035N03TR and offers improvements in key parameters:
Higher Current Capability: Continuous drain current reaches 6A (an increase of 2.5A), providing greater power handling capacity.
Lower Conduction Loss: On-resistance at 10V is 26mΩ, significantly lower than the classic's 54mΩ@4.5V, reducing conduction losses and improving system efficiency.
Full Compatibility: Uses a pin-compatible SOT23-6 package, enabling direct replacement without PCB modifications.
Advanced Technology: Based on Trench technology, ensuring stable and reliable performance with a gate threshold voltage of 1.7V and enhanced VGS tolerance of ±20V.
Part 3: Core Value Beyond Specifications
Choosing a domestic alternative brings deeper advantages:
Ensuring Supply Chain Security: Reduces dependence on international supply chains, ensuring supply stability and production continuity.
Optimizing Overall Cost: Typically offers better cost competitiveness with equivalent or superior performance, potentially enabling optimization of peripheral designs.
Accessing Rapid Local Support: Domestic suppliers can provide more agile technical support and joint development tailored to actual application scenarios.
Boosting the Industrial Ecosystem: Every successful application helps the domestic semiconductor industry accumulate experience and iterate technology, forming a virtuous development cycle.
Part 4: A Robust Path for Substitution Implementation
For a smooth transition, the following steps are recommended:
Detailed Specification Comparison: Carefully compare all key electrical parameters and characteristic curves.
Rigorous Laboratory Testing: Conduct static parameter tests, dynamic switching tests, temperature rise/efficiency tests, and reliability stress tests.
Small-Batch Pilot Verification: Trial the component in real products and environments, tracking long-term performance.
Develop a Switchover and Backup Plan: Implement the substitution gradually after verification is complete, while retaining the original design as a short-term backup.
Conclusion: Moving from "Usable" to "Excellent"
The evolution from the RTQ035N03TR to the VB7322 demonstrates that domestic power semiconductors now possess the capability to compete with and even surpass international classics in certain aspects. Adopting such high-performance domestic components is not only a pragmatic choice to address current supply chain challenges but also a strategic move to build an autonomous, resilient, and innovative industrial ecosystem for the future. Now is the opportune time to actively evaluate and introduce high-quality domestic solutions.