Content last revised on March 9, 2026
International Rectifier UFB200FA40 | 400V 200A Ultrafast Diode Bridge Module
The International Rectifier UFB200FA40 is a high-performance, full-bridge diode module engineered for demanding power conversion applications. Integrating four ultrafast, soft-recovery HEXFRED diodes into a single, isolated SOT-227 package, this module provides a robust and efficient front-end rectification solution for systems where speed and low noise are paramount. This product originates from International Rectifier (IR) technology, which is now supported by Vishay. It is an ideal building block for high-frequency switch-mode power supplies (SMPS), motor drives, and uninterruptible power supplies (UPS).
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Diode Module
Technical Deep Dive: The Core Advantages of the UFB200FA40
- Ultrafast Soft Recovery (HEXFRED Diodes): The heart of the UFB200FA40 lies in its proprietary HEXFRED diodes. These diodes are optimized for an extremely soft recovery characteristic, preventing the abrupt turn-off common in standard fast-recovery diodes. This significantly reduces high-frequency EMI and voltage ringing. For designers, this translates directly to smaller, less expensive snubber circuits and simplified EMI suppression filters, saving both board space and component cost while ensuring greater system stability.
- Integrated and Isolated Package: The SOT-227 package offers more than just convenience. By integrating the full bridge into a single module with an electrically isolated baseplate (2500 VRMS), it simplifies mechanical assembly onto a heatsink and ensures excellent thermal management. This design minimizes parasitic inductance compared to a layout with four discrete components, leading to cleaner switching and improved reliability, especially at higher frequencies.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer (Original/Current) | International Rectifier / Vishay |
| Repetitive Peak Reverse Voltage (VRRM) | 400 V |
| Average Forward Current (IF(AV)) per Diode | 50 A @ TC = 105°C |
| Total Average Current (Full Bridge) | 200 A |
| Forward Voltage Drop (VF) @ 50A, 25°C | 1.3 V (Typical) |
| Reverse Recovery Time (trr) | 55 ns (Typical) |
| Isolation Voltage (VISOL) | 2500 VRMS |
For a comprehensive list of parameters, please refer to the official UFB200FA40 Datasheet.
Application Scenarios & Value Proposition
The UFB200FA40 is not just a component; it's a problem-solver in critical power systems:
- Welding Equipment & Power Supplies: In high-frequency welding inverters and SMPS, the module's low reverse recovery charge (Qrr) and soft recovery characteristics are crucial. They minimize switching losses and reduce stress on the downstream IGBTs or MOSFETs, enhancing the overall efficiency and lifespan of the equipment.
- Uninterruptible Power Supplies (UPS): Reliability is non-negotiable in UPS systems. The UFB200FA40's robust, integrated design reduces component count and potential points of failure. Its superior thermal performance ensures stable operation during critical backup power delivery.
- Motor Drives and Servo Control: A clean, stable DC bus is essential for precise motor control. This module provides a high-quality rectified input, preventing noise from propagating into the inverter stage and affecting motor performance. This leads to smoother operation and better control accuracy in industrial automation.
Selection Guidance: UFB200FA40 vs. Discrete Diodes
Engineers often face a choice: use an integrated module like the UFB200FA40 or build a bridge with four discrete ultrafast diodes. While discrete components might offer slightly lower initial costs, the UFB200FA40 provides compelling advantages in production and performance. It eliminates the complexity of matching diodes, designing a complex PCB layout to manage thermal and electrical parasitics, and the labor of mounting four separate components. For systems prioritizing reliability, compact design, and simplified manufacturing, the UFB200FA40 is the superior choice.
Frequently Asked Questions (FAQ)
- What does "soft recovery" really mean for my design?"Soft recovery" refers to the gradual, controlled decay of the reverse recovery current. This prevents the large voltage spikes and oscillations common with snappy diodes, protecting other semiconductors and making it easier to meet EMC standards. Think of it as a soft-recovery diode that acts as its own built-in snubber.
- Can I parallel these modules for higher current?While paralleling is possible, it requires careful circuit design to ensure current sharing, especially during dynamic conditions. For significantly higher current needs, it is often better to select a higher-rated single module. If you need assistance with a higher power design, please Contact Us for a Quote and expert advice.
- Is this module suitable for a PFC boost converter input?Absolutely. The ultrafast characteristics of the UFB200FA40 make it an excellent choice for the input bridge rectifier feeding a Power Factor Correction (PFC) boost stage, where it must handle high-frequency switching currents efficiently.
If your application demands superior rectification performance, simplified thermal design, and lower EMI, the UFB200FA40 diode module is a strategic choice. Explore More Diode Modules and power components for your complete system design.
