Infineon Technologies AG has introduced the XDP8HD40S-1, a high-voltage hot-swap controller developed to provide digital power-path protection and monitoring in next-generation AI server systems operating at ±400 V and 800 VDC. As AI infrastructure evolves beyond 48 V power distribution to support higher rack power demands, safe and reliable hot-swapping is becoming increasingly essential to ensure continuous system operation. The new controller allows power modules, converters, GPUs, and server subsystems to be connected or disconnected safely without compromising overall system stability. With this launch, Infineon further expands its power semiconductor portfolio, which includes silicon, silicon carbide (SiC), and gallium nitride (GaN) technologies, into the protection and monitoring solutions needed to support scalable, high-power AI infrastructure.
“Future AI data centers require power delivery systems that combine high efficiency, maximum reliability, and comprehensive protection capabilities,” said Magdalene Boebel, Senior Vice President and Business Line Head of Power System ICs at Infineon. “The XDP8HD40S-1 enables system designers to implement reliable hot-swap solutions for ±400 V and 800 V power architectures while providing the monitoring and protection features needed to maximize server uptime and operational efficiency.”
The XDP8HD40S-1 is designed for a range of high-voltage applications, including two-wire 800 V or ±400 V intermediate bus converters and GPUs, 1.500 V intermediate bus converter systems, high-voltage rack and server power delivery, battery backup systems, peak shaving, and 400 V to 800 V single- or dual-side hot-swap implementations. The device is compatible with Infineon’s power semiconductor portfolio, including OptiMOS MOSFETs and CoolSiC JFETs, allowing designers to build efficient, rugged protection stages using the same underlying technologies Infineon has already applied in its 800 VDC AI data center reference designs.
Operating at higher system voltages increases the complexity of controlling inrush current and protecting infrastructure from transient events. The XDP8HD40S-1 integrates digital Safe Operating Area (SOA) control with programmable and preconfigured active protections.Together with a variable pulse SOA control mode (Boost Mode), the device supports optimized startup behavior while maintaining safe operation of the power switch. An integrated gate driver supports external SiC cascode implementations based on a MOSFET and JFET combination, enabling efficient control of high-voltage power stages. To further enhance system robustness, the controller incorporates surge immunity protection and supports fast power-switch shutdown with a configurable 1.5 A pull-down current, helping protect AI compute infrastructure during abnormal operating conditions.
The XDP8HD40S-1 supports a broad operating voltage range, with VDDB from 4.5 V to 24 V and VDDA from 4.5 V to 13.2 V, allowing integration into a variety of server and rack-level power systems. For system management and remote diagnostics, the controller includes a PMBus 1.5 interface with enhanced security features for integration into data center management infrastructure. A built-in black-box recording feature captures critical event information to help accelerate fault analysis and system debugging. Additional protection features include programmable input and output overvoltage and undervoltage protection, external temperature sensor support, and overtemperature protection.
Modern AI server platforms increasingly require real-time visibility into power consumption and system health. The XDP8HD40S-1 addresses this through 12-bit current and voltage analog-to-digital converters, providing measurement accuracies of approximately 1 percent for voltage, 1 percent for current, and 3 percent for power, with analog power monitoring reporting accuracy of 1.5 percent and integrated energy metering for continuous system monitoring. These capabilities support system optimization, predictive maintenance, and power management strategies in high-density AI computing platforms, complementing the reference designs Infineon has already demonstrated for 800 V-to-48 V and direct-conversion architectures now emerging as AI data center rack power continues to rise.
Availability
The XDP8HD40S-1 is offered in an LFDSO-40 package measuring 10.7 mm × 10.3 mm. Samples are targeted for availability in the second quarter of 2027.
