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To enable the next generation of solid-state power distribution systems, Infineon Technologies AG is expanding its silicon carbide (SiC) portfolio with the new CoolSiC™ JFET product family. The new devices deliver minimized conduction losses, solid turn-off capability, and high robustness, making them ideal for advanced solid-state protection and distribution.
With robust short-circuit capability, thermal stability in linear mode, and precise overvoltage control, CoolSiC JFETs enable reliable and efficient system performance in a wide range of industrial and automotive applications, including solid-state circuit breakers (SSCBs), AI data center hot-swaps, eFuses, motor soft starters, industrial safety relays, and automotive battery disconnect switches.
“With CoolSiC JFET, we are addressing the growing demand for smarter, faster, and more robust power distribution systems,” says Dr. Peter Wawer, Division President Green Industrial Power at Infineon Technologies. “This application-driven power semiconductor technology is specifically designed to provide our customers with the tools they need to solve the complex challenges in this rapidly evolving space. We are proud to introduce devices that achieve best-in-class R DS(ON), setting a new standard for SiC performance and reaffirming Infineon’s leadership in the field of wide-bandgap technology.”
The first generation of CoolSiC JFETs features ultra-low R DS(ON) starting at 1.5 mΩ (750 V BDss) and 2.3 mΩ (1200 V BDss), significantly reducing conduction losses. The bulk-channel optimized SiC JFET offers high robustness under short-circuit and avalanche failure conditions. Housed in a Q-DPAK top-side cooled package, the devices support easy paralleling and scalable current handling, enabling compact, high-power systems with flexible layout and integration options. Their predictable switching behavior under thermal stress, overload and fault conditions provides maximum long-term reliability in continuous operation.
To meet the thermal and mechanical challenges of harsh application environments, CoolSiC JFETs leverage Infineon’s advanced .XT interconnection technology with diffusion soldering. This significantly improves transient thermal impedance and robustness under pulsed and cyclic loads typical of industrial power systems. Tested and qualified under real-world operating conditions of solid-state power switches and based on the industry-standard Q-DPAK package, the devices enable quick and seamless design integration in both industrial and automotive applications.
Engineering samples of the new CoolSiC JFET family will be available later in 2025, with volume production starting in 2026. The product portfolio will be further expanded with a variety of packages and modules. The product family has been successfully demonstrated at the Infineon booth at PCIM Europe 2025 in Nuremberg. More information is available at www.infineon.com/jfet.
Original – Infineon Technologies
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onsemi announced that it has completed its acquisition of the Silicon Carbide Junction Field-Effect Transistor (SiC JFET) technology business, including the United Silicon Carbide subsidiary, from Qorvo for $115 million in cash.
The addition of SiC JFET technology will complement onsemi’s extensive EliteSiC power portfolio and enable the company to address the need for high energy efficiency and power density in the AC-DC stage in power supply units for AI data centers.
In electric vehicle applications, SiC JFETs help improve efficiency and safety by replacing multiple components with a solid-state switch based on SiC JFET in battery disconnect units. In the industrial end-market, SiC JFETs enable certain energy storage topologies and solid-state circuit breakers.
“This acquisition further strengthens onsemi’s leadership in power semiconductors by providing disruptive and market leading technologies to our customers to solve their most pressing power density and efficiency problems in AI data centers, automotive and industrial markets,” said Simon Keeton, group president and general manager of the Power Solutions Group, onsemi. “We will continue to innovate and make investments to expand our technology leadership in providing the most comprehensive power system solutions.”
Original – onsemi
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onsemi has unveiled plans to acquire Qorvo’s Silicon Carbide (SiC) JFET business, a strategic move that enhances its portfolio in high- and mid-voltage power semiconductors. The $115 million deal includes Qorvo’s United Silicon Carbide subsidiary and is expected to close in Q1 2025. This acquisition is projected to expand onsemi’s market opportunity by $1.3 billion by 2030, focusing on AI, data centers, EVs, and industrial markets. By leveraging its vertically integrated SiC supply chain, onsemi aims to boost efficiency, profitability, and innovation across key technology areas.
SiC JFET technology offers superior power efficiency, reduced costs, and versatility in advanced applications, including EV battery systems, AI-driven data centers, and renewable energy solutions. It promises to disrupt traditional silicon-based and GaN technologies, with its superior switching speed, lower on-resistance, and smaller die size. This acquisition positions onsemi to capitalize on the growing demand for sustainable, high-performance power solutions in a wide range of industries.
Moreover, SiC JFETs are designed to enable transformative advancements in industrial applications such as power supplies, solar power converters, and energy storage systems. These innovations align with market trends emphasizing higher efficiency and reliability. The technology also offers critical advantages in EV battery safety, ensuring quicker response and long-term dependability through solid-state switches that surpass conventional electromechanical solutions.
By integrating Qorvo’s business, onsemi also strengthens its presence in the competitive AI and data center markets. The shift to higher voltages and power capacities in these areas provides a unique opportunity for SiC JFETs to reduce costs and improve performance, establishing onsemi as a leader in next-generation semiconductor solutions.
Original – onsemi
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Qorvo® announced the industry’s first 4 milliohm silicon carbide (SiC) junction field effect transistor (JFET) in a TOLL package. It was designed for circuit protection applications including solid-state circuit breakers, where low resistance, superior thermal performance, small size and reliability are paramount.
With RDS(on) of just 4 milliohm, the UJ4N075004L8S offers the industry’s lowest on-resistance among the 650V to 750V class of power devices in standard discrete packages. This low RDS(on) drives significant reductions in heat generation and, when coupled with a compact TOLL package, enables a solution size that is 40% smaller than competing devices in TO-263 packages.
This small solution size supports the space-limited dimensions of today’s electromechanical circuit breakers and operates without the need for elaborate cooling systems, accelerating the transition from electromechanical circuit breakers to semiconductor-based solid-state circuit breakers (SSCBs).
“With the introduction of the UJ4N075004L8S, Qorvo continues to lead the way in SiC power innovation, catalyzing the emergence of applications such as circuit protection with ultra-low RDS(on) FET offerings in very small footprints,” said Ramanan Natarajan, director of product line marketing for Qorvo’s SiC Power Products business. “The SSCB market is growing rapidly, and Qorvo’s newest product marks a significant milestone in the evolution of the technology.”
Qorvo’s JFETs are highly robust devices well suited to meet the challenges of circuit protection, providing the ability to turn off at very high inrush currents during circuit faults. Qorvo’s newest JFET can also withstand high instantaneous junction temperatures without experiencing degradation or parametric drift. The normally-on nature of the JFET lends itself to seamless integration into systems where the switch is in the on-state by default and in turn-off state under fault conditions.
The UJ4N075004L8S is now available for sampling and will enter full production in Q4 2024, accompanied by additional JFET options, including 750V with 5 milliohm and 1200V with 8 milliohm ratings, all in TO-247 packaging. For more details about this transformative power technology and detailed product specifications, please visit UJ4N075004L8S.
Original – Qorvo
