In medium-high voltage application scenarios such as switch-mode power supplies, motor drives, lighting ballasts, and industrial controls, Toshiba's TK5A55D (STA4, Q, M) has been a widely adopted N-channel power MOSFET for engineers, known for its balance of voltage rating and current capability. However, facing challenges like extended international lead times, procurement cost volatility, and delayed technical support, the need for a reliable domestic alternative has become increasingly critical for ensuring supply chain resilience and cost optimization.
Responding to this market demand, VBsemi leverages its independent R&D prowess in power semiconductors to introduce the VBMB155R09 N-channel MOSFET. This product is precisely engineered to counterpart the TK5A55D, offering key advantages of enhanced parameters, technological parity, and full package compatibility. It serves as a direct drop-in replacement without circuit modifications, delivering a more powerful, stable, and locally supported solution.
Superior Parameter Performance, Delivering Significant Performance Headroom.
Designed as a domestic upgrade for the TK5A55D, the VBMB155R09 achieves substantial improvements in critical electrical specifications:
The drain-source voltage is maintained at a robust 550V, matching the original part, ensuring reliable operation in similar voltage environments. The continuous drain current is dramatically increased to 9A, an 80% enhancement over the original 5A, providing significantly higher current-carrying capacity for more demanding loads or power density improvements.
A major advancement is the on-state resistance, reduced to 1000mΩ (@10V gate drive), compared to the TK5A55D's 1.7Ω. This 41% reduction in RDS(on) directly translates to lower conduction losses, improved system efficiency, and reduced thermal dissipation.
Furthermore, the VBMB155R09 supports a ±30V gate-source voltage, enhancing robustness against gate noise and ESD events. The 3.2V gate threshold voltage ensures reliable switching and compatibility with common driver ICs, facilitating easy integration.
Advanced Planar Technology for Enhanced Reliability and Switching Performance.
The VBMB155R09 utilizes advanced Planar gate technology, optimizing the trade-off between on-resistance, switching speed, and reliability. It undergoes rigorous pre-screening including 100% avalanche testing, ensuring excellent ruggedness against voltage spikes and energy surges encountered during switching. The optimized internal capacitance design reduces switching losses and improves dv/dt capability, making it suitable for demanding high-frequency applications. With an operational temperature range of -55°C to 150°C and validated through extended reliability tests such as high-temperature/high-humidity aging, it offers dependable performance in harsh environments, ideal for industrial, automotive, and outdoor applications.
Full Package Compatibility for Seamless, Risk-Free Replacement.
The VBMB155R09 is offered in a TO-220F package, which is fully compatible in footprint, pinout, and mounting geometry with the TK5A55D's package. This complete mechanical and electrical compatibility enables a true "plug-and-play" replacement strategy. Engineers can substitute the component directly on existing PCB layouts without redesigning circuits or thermal management systems. This eliminates R&D re-engineering costs, accelerates verification (typically within days), and avoids additional expenses related to PCB re-spins or mechanical requalification, allowing for rapid supply chain transition.
Localized Supply Chain and Responsive Technical Support.
VBsemi's domestic manufacturing base ensures a stable and shorter lead time for the VBMB155R09, typically within 2 weeks, mitigating risks associated with global logistics and geopolitical uncertainties. As a local provider, VBsemi offers dedicated, responsive technical support, providing comprehensive documentation including substitution guides, detailed datasheets, and application notes. The technical team can provide prompt, scenario-specific assistance and troubleshooting, effectively solving the slow response and communication barriers often encountered with overseas suppliers.
From industrial SMPS and motor drives to lighting systems and power tools, the VBMB155R09, with its compelling advantages of "higher current, lower resistance, full compatibility, secure supply, and local support," stands as the optimal domestic alternative to the Toshiba TK5A55D. It has gained successful adoption across various industry leaders. Choosing the VBMB155R09 is a strategic step towards securing your supply chain, reducing costs, and enhancing product performance—without assuming redesign risks.