Newsletter-Spring 2026
As the demand for high power density and energy efficiency in AI Servers rapidly escalates, the 800V HVDC (High Voltage Direct Current) architecture has emerged as the mainstream design for next-generation data centers and high-end server power systems. Firstohm is pleased to announce its participation in upcoming international electronics exhibitions, where it will showcase its latest 800V HVDC Bleeder Resistor Application Solutions, specifically designed to be the "Safety Guardian" of high-voltage AI server architectures.
Why Are AI Servers Moving Toward 800V HVDC?
Compared to traditional AC or 48V architectures, 800V HVDC offers several key advantages:
- Reduced transmission losses: Lower current leads to significantly improved system efficiency.
- High-power support: Meets the power demands of next-generation AI GPUs and accelerators.
- Enhanced reliability: Simplified power conversion stages improve overall system stability.
As voltage and power levels continue to increase, discharge resistors are no longer just passive components—they have become a critical design element to ensure safety and stability in modern data centers.
★Case study
In 800V HVDC architectures, bus capacitors store a substantial amount of energy. To ensure personnel safety after system shutdown and to protect downstream circuit components, bleeder resistors play a critical role by safely discharging residual high voltage within a specified timeframe.For HVDC power applications, high-reliability, high-voltage, and surge-resistant resistors are widely used in:
- AI server power supply units (PSUs)
- HVDC power distribution cabinets and power architectures
- DC-link capacitor discharge circuits
- Energy storage systems (ESS) and backup battery units (BBU)
The design focus of these resistors is safety, stability, and long-term reliability, providing a solid and dependable power foundation for modern AI data centers.
800V Bleeder Conditions :
Design Tip:
Capacitance and discharge time are the key parameters when selecting resistor values and determining series/parallel configurations. The design must ensure that both the safety discharge timeframe and the energy-handling capacity of each resistor are properly satisfied.
Discharge Energy Calculation and Selection Criteria:
Considering the discharge time and power distribution, it is recommended to use 4 resistors in series, with each resistor rated to handle approximately 5 J of energy.
Recommended Product: SRM301 Surge Resistant MELF Resistor
- Model: SRM301 (3W)Dimensions: 4.0 × 10.5 mm
- Resistance: 1.5KΩ ±5% (Typical for 4-pcs in series configuration)
- Result: Discharge for 1000 cycle, Resistance change ΔR = 0.035% (PASS)
Key Advantages of the SRM series:
- High Pulse Endurance: Specifically designed for instantaneous discharge applications.
- Safety Certified: Passed the German VDE safety certification.
- MELF Structure: The cylindrical MELF design provides superior heat dissipation and higher reliability compared to standard flat chips.
- Compact Design: Ideal for modular designs and high-density PCB layouts
Firstohm – Surge Resistant MELF Resistors Specifications
★Firstohm in Action
April 8–10, 2026: electronica India
Location: India Expo Centre, Greater Noida, Delhi NCR, India
Booth Number: H10.F31 (Hall 10, Booth F31)
July 1–3, 2026: electronica China (Shanghai)
Venue: Shanghai New International Expo Centre
Booth No.: N2.300
Firstohm will showcase these optimized pre-charge and discharge solutions at the above events.
We warmly invite industry professionals to visit our booth for technical discussions and insights. For further inquiries, please contact our sales representatives or reach out via email at qrc@firstohm.com