Content last revised on August 5, 2026
SanRex FRS200CA100 Fast Recovery Diode Module
The SanRex FRS200CA100 is an isolated fast recovery diode module designed to support high-efficiency power conversion. The module features 1000V | 200A | Rth(j-c) 0.2°C/W. Key benefits include high surge current capability and minimized switching losses. A fast reverse recovery time of 350 ns directly reduces switching losses in welder power supplies by minimizing current overlap during transistor turn-off. What is the primary benefit of the short reverse recovery time? It minimizes switching losses in high-frequency applications. Why is the isolated baseplate significant? It simplifies heatsink design by eliminating external insulation. For high-frequency inverters requiring 1000V blocking voltage and fast switching, the FRS200CA100 fast recovery diode is the optimal choice.
Key Parameter Overview
Highlighting Key Metrics for Switching Efficiency and Loss Reduction
The electrical and thermal specifications of the SanRex FRS200CA100 define its operational boundaries in high-power systems. The table below outlines the core parameters essential for engineering evaluation.
| Parameter Symbol | Specification Name | Value | Unit |
|---|---|---|---|
| VRRM | Repetitive Peak Reverse Voltage | 1000 | V |
| IF(AV) | Average Forward Current (Tc = 78°C) | 200 | A |
| VFM | Forward Voltage Drop (Max @ IF = 200A) | 1.8 | V |
| trr | Max Reverse Recovery Time | 350 | ns |
| IFSM | Surge Forward Current (1/2 cycle, 60Hz) | 3300 | A |
| I2t | I2t Value (for one cycle of surge current) | 45000 | A2s |
| Rth(j-c) | Thermal Resistance (Junction to Case, Max) | 0.20 | °C/W |
| VISO | Isolation Breakdown Voltage (A.C. 1 min) | 2500 | V |
Download the FRS200CA100 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Optimizing Performance in Inverters and Industrial Welding Power Supplies
The SanRex FRS200CA100 finds its primary strength when integrated into high-speed switching systems. In industrial environments, engineers often face severe electrical noise and thermal runaway issues when standard recovery rectifiers fail to transition fast enough. During high-frequency inversion phases in a welding power supply, a slow freewheeling diode causes high peak reverse currents, generating significant switching losses. The FRS200CA100 module solves this with a reverse recovery time of 350 ns, limiting energy dissipation during transistor turn-off and protecting associated active switches such as IGBTs.
In addition to welding equipment, this fast recovery diode acts as a robust freewheeling path in IGBT modules and freewheeling paths in IGBT modules, which are crucial for uninterruptible power supplies (UPS) and telecom power units. Its high surge current capability (IFSM of 3300A) ensures that transient power surges during startups do not lead to catastrophic junction failures. To ensure high-reliability performance, designers must also focus on preventing overcurrent and thermal failures by implementing adequate cooling mechanisms.
For designs operating on higher AC grid inputs that require a greater safety margin, engineers can evaluate alternative devices like the SKKD162/16, which handles up to 1600V, or select the MDS200A1600V from our product range to support higher voltage requirements.
Technical & Design Deep Dive
Thermal Packaging and Dynamic Switching Physics Under Stress
The internal construction of the SanRex FRS200CA100 features an isolated copper baseplate. This electrical isolation simplifies thermal management by allowing multiple modules to share a single heatsink without short-circuiting. The junction-to-case thermal resistance (Rth(j-c)) is rated at a maximum of 0.20 °C/W. To conceptualize this, think of Thermal Resistance as a thermal highway; a lower thermal resistance acts as a wider multi-lane highway, allowing heat to escape from the silicon junction to the heatsink at high speeds, thereby preventing a thermal traffic jam that could degrade the semiconductor.
Moreover, the recovery behavior of this diode is a vital consideration in power semiconductor selection. When transitioning from a conducting to a non-conducting state, a diode cannot shut off immediately due to stored charge. This reverse recovery time (trr) behaves like the braking distance of a vehicle. A standard rectifier diode with a long braking distance continues to conduct in reverse, leading to massive energy overlap and switching loss when the transistor turns back on. With a short trr of 350 ns, the FRS200CA100 stops current flow rapidly, effectively shortening the braking distance and dramatically reducing power losses during high-frequency switching. For a comprehensive overview of power module dynamics, engineers can consult the power semiconductor selection guide.
Frequently Asked Questions
Addressing Design Constraints and Dynamic Performance Parameters
- How does the reverse recovery time (trr) of the FRS200CA100 directly impact overall switching losses in a high-frequency system?A shorter trr of 350 ns reduces the time the diode conducts in reverse during off-state transitions. This minimizes the reverse recovery current overlap with the turn-on voltage of the pairing transistor, significantly lowering dynamic power losses and heat generation.
- How does the low Rth(j-c) of 0.20 °C/W influence heatsink selection and system power density?The low thermal resistance of 0.20 °C/W ensures efficient heat transfer from the junction to the case. This allows engineers to use smaller heatsinks or run the module at higher power densities without exceeding the maximum junction temperature of 150°C, maintaining thermal safety margins.
- What are the recommended mounting torque specifications for the FRS200CA100 to ensure optimal thermal contact?According to the official specifications, the mounting torque for the baseplate (M6) should be 2.5 to 3.9 N·m, and the terminal connection (M5) torque should be 1.5 to 2.5 N·m. Proper torque prevents air gaps and excessive stress, ensuring low contact thermal resistance.
From a system design perspective, selecting components with optimized thermal paths and fast switching transients is a strategic imperative for modern industrial converters. Utilizing isolated baseplate technologies like that found in the FRS200CA100 enables engineers to design compact, high-efficiency systems that align with global energy-saving directives and long-term industrial reliability standards. When scaling designs or comparing layouts, engineering teams can also source alternatives from manufacturers like semikron to match specific voltage margins.
