Infineon’s New Silicon Carbide Chips Target the Power Grid Inside AI Data Centers

Infineon introduces 750V/1200V CoolSiC JFETs for AI data center power infrastructure, enabling solid-state circuit breakers and hot-swap designs; shares surged 129% YTD.

Infineon isn’t building the brains of artificial intelligence — it’s building the circulatory system. The Munich-based chipmaker has expanded its CoolSiC JFET portfolio with Normally-Off variants designed specifically for the power infrastructure of AI data centers and industrial protection systems. The move, announced on June 2, gives engineers a way to replace electromechanical switches with semiconductor-based solid-state circuit breakers, battery disconnect switches, and hot-swap designs — all of which must handle the extreme power loads of modern AI clusters.

The new lineup includes 750-volt and 1,200-volt CoolSiC JFETs in Q-DPAK packages that are already entering series production. Infineon claims RDS-on values of 1.6 milliohm at 750 volts and 2.3 milliohm at 1,200 volts, among the lowest available in those voltage classes. A 1,200-volt JFET in the TO-247-4 package, with an on-resistance starting at 5.0 milliohm, is positioned as a drop-in replacement for existing SiC MOSFET designs — no printed circuit board changes needed. The company is also offering Q-DPAK, TO-247-4, and TOLL packages, along with Dual-Drive and Cascode configurations. In the Dual-Drive version, designers get separate gate access to both transistors; the Cascode variant exposes only the MOSFET gate and works with standard gate drivers, lowering the barrier for upgrading existing equipment.

Batch production of the 750-volt and 1,200-volt Q-DPAK CoolSiC JFETs is slated for later in 2026, with engineering samples of other variants already available. Infineon will showcase the portfolio at PCIM Europe in Nuremberg from June 9 to 11, where demonstrations include solid-state circuit breakers capable of isolating faults within microseconds, as well as HVDC sidecars and DC microgrids for next-generation data center architectures. The technical rationale is pragmatic: in these applications, the devices are mostly on, with fault events occurring only briefly and rarely, so the design priorities shift toward conduction losses, linear-mode robustness, and avalanche capability.

The product news lands against a remarkable stock rally. Infineon’s shares have surged roughly 129% since the start of the year, touching a 52-week high of €87.85. On Wednesday morning, the stock was trading around €86.76, down about 1.5% from the previous day’s close — a modest pullback after the historic run. The company has already flagged strong demand for power-supply solutions in AI data centers, guiding for third-quarter revenue of approximately €4.1 billion in May. That guidance was part of a broader outlook revision on May 6, in which Infineon forecast a significant year-on-year revenue increase for fiscal 2026, a segment-result margin of roughly 20%, and adjusted free cash flow of around €1.65 billion.

What Infineon is selling here isn’t just components — it’s a blueprint for re-architecting how electricity flows through a data center. Solid-state protection switches switch faster than electromechanical systems, and in a hyperscale AI environment, every microsecond of downtime translates directly into lost compute capacity. By coupling its newly expanded SiC portfolio with the broader growth themes of solid-state transformers, robotics, and charging infrastructure — all on display at PCIM — Infineon is making a bet that its role as the enabler of AI’s physical backbone will generate enough book-to-bill momentum to justify the stock’s triple-digit run. The next quarterly numbers will show whether that narrative is translating into orders and margins.