Content last revised on November 12, 2025
Vishay VS-UFB280FA20 | 200V 280A Insulated Ultrafast Diode Module
The Vishay VS-UFB280FA20 is a highly integrated and robust power module engineered for demanding, high-current power conversion applications. As an **Ultrafast Rectifier Module** (FRED Pt® Technology), it contains **two fully independent, high-speed diodes** in the compact SOT-227 package. This module provides a streamlined solution for designers of high-frequency power supplies, DC-DC converters, and welding systems who prioritize efficiency, power density, and reliability.
· Categories:
Diode Module
- Brand: Vishay
- Model: VS-UFB280FA20
- Core Function: **200V**, **280A (Average per module)** Ultrafast Diode Module (Two independent Diodes)
- Key Strengths: **Ultrafast** reverse recovery time (**45 ns**), low conduction losses, and high $T_J$ reliability.
- Typical Applications: High-Frequency Switching Mode Power Supplies (SMPS), welding equipment, high-current DC-DC converters, and industrial rectification.
Technical Deep-Dive: The Engineering Edge
The performance of the VS-UFB280FA20 is rooted in its advanced silicon technology and high-current packaging. Two features stand out for system-level benefits:
- Ultrafast, Soft Recovery Characteristics: The module utilizes Vishay's **FRED Pt®** silicon, optimized for rapid switching. The low typical **Reverse Recovery Time ($t_{rr}$) of 45 ns** ensures minimal power loss during high-frequency operation. Crucially, its **soft recovery** behavior reduces voltage overshoots and ringing, significantly lowering Electro-Magnetic Interference (EMI) and enhancing system reliability by minimizing stress on surrounding components.
- Low Conduction Loss and High Thermal Margin: The design achieves a very low typical **Forward Voltage Drop ($V_F$) of $0.95 \text{ V}$** (at $120 \text{ A}, 175^\circ C$). This minimizes power dissipated as heat during high-current conduction. The module is specified for a maximum operating junction temperature ($T_J$) of **$175^\circ C$**, providing superior thermal performance and allowing for robust operation in hot industrial environments.
Application-Specific Value Proposition
The technical features of the Vishay **VS-UFB280FA20** deliver tangible benefits across various industrial sectors:
- High-Frequency Power Supplies & DC-DC Converters: The **ultrafast recovery** speed is a key enabler for compact SMPS and high-frequency DC-DC designs. Operating at higher frequencies allows designers to use smaller and lighter magnetic components (transformers and inductors), leading to a significant increase in power density.
- Welding Equipment Rectification: Welders require reliable, high-current rectification. The module's robust **$280 \text{ A}$** capability combined with its **$200 \text{ V}$** rating and high $T_J$ ensures stable, long-service life, even under the repetitive thermal and electrical stress found in professional welding applications.
Key Technical Parameters at a Glance
The following table highlights the critical **diode** performance parameters of the Vishay VS-UFB280FA20.
| Parameter | Value |
|---|---|
| Max. Reverse Voltage (VRRM) | 200 V |
| Average Forward Current (IF(AV) per module @ TC=100°C) | 280 A |
| Forward Voltage (VF typ. @ IF=120A, 175°C) | 0.95 V |
| Reverse Recovery Time (trr typ. @ 25°C) | 45 ns |
| Max. Operating Junction Temperature (TJ) | **-55°C to +175°C** |
| Package Type | SOT-227 |
For complete specifications, download the official **Vishay** datasheet here: VS-UFB280FA20 Datasheet.
Industry Insight & Design Advantage
The **VS-UFB280FA20** offers a compelling balance of performance, reliability, and value in the sub-600V range. It delivers a significant efficiency uplift over standard recovery diodes without the cost and complexity of high-voltage SiC/GaN devices. Its combination of high current handling, low losses, and a standard, easy-to-use **SOT-227** package makes it an ideal workhorse for optimizing systems. For engineers looking to upgrade existing designs or develop new, cost-effective platforms, this module is the reliable choice.
To discover more solutions, explore our full range of Diode Modules.
Frequently Asked Questions (FAQ)
- How does the SOT-227 package benefit my design?The **SOT-227** is an industry-standard, isolated package renowned for its ease of mounting and excellent thermal transfer to a heatsink. Its isolated baseplate simplifies mechanical design by eliminating the need for external insulating materials, reducing assembly time and potential points of failure.
- What does "Ultrafast Recovery" mean for system efficiency?Ultrafast recovery means the diode switches off extremely quickly (low $t_{rr}$). This minimizes energy loss during the diode's commutation, which is crucial in high-frequency circuits. Reduced recovery loss directly translates to higher overall system efficiency and less heat generation.
- Is this module suitable for paralleling?While the module is designed for high-current applications, paralleling **SOT-227** packages requires careful attention to layout symmetry to ensure current sharing.