SanRex Fast Recovery Diode Modules

SanRex Fast Recovery Diode Modules are high‑power semiconductor rectifier devices designed for use in industrial power conversion and motor control systems. These SanRex modules are optimized to handle high current and high voltage operation while maintaining fast reverse recovery characteristics, making the devices well-suited for modern high‑frequency switching applications. The modules employ fast recovery or soft recovery diode structures to minimize reverse recovery time and switching losses. This performance characteristic is critical when the diodes are used in conjunction with IGBTs, MOSFETs, and power transistors, where excessive recovery current can increase losses, electromagnetic noise, and device stress. By reducing the reverse recovery charge, these modules help improve overall system efficiency and reliability.

Electrically, the product range spans wide voltage ratings (from low‑voltage, high‑current devices to high‑voltage rectifiers exceeding 1kV) and substantial current capabilities, reaching several hundred amperes depending on the series. The modules are designed to support both continuous conduction and high surge currents, allowing the components to tolerate startup, overload, and transient conditions commonly encountered in industrial environments.

From a mechanical and thermal standpoint, the modules are housed in robust power module packages intended for direct mounting onto heatsinks. The SanRex modules feature low junction‑to‑case thermal resistance, enabling efficient heat dissipation under high power operation. Secure screw terminals provide reliable electrical connections, while the package designs support mechanical stability, vibration resistance, and long service life. Some configurations also incorporate electrically isolated baseplates, simplifying system insulation design.

The product families include single‑diode and dual‑diode configurations, such as common cathode and common anode layouts, giving designers flexibility when implementing rectifier bridges, freewheeling paths, or snubber circuits. This modular approach allows the same technology platform to be applied across multiple circuit topologies without redesigning the mechanical interface.

Overall, these SanRex fast recovery diode modules are engineered for industrial‑grade reliability, high efficiency, and thermal robustness. These components are commonly used in inverters, converters, motor drives, UPS systems, welding equipment, induction heating power supplies, renewable energy inverters, and DC power supplies, where dependable high‑power rectification and fast switching performance are required over extended operating lifetimes.

Features

Fast recovery performance
- Fast reverse recovery time (trr) suitable for high‑frequency switching
- Reduced switching losses compared to standard rectifier diodes
- Optimized for use with IGBTs and power transistors
Electrical characteristics
- High repetitive peak reverse voltage ratings (typically 50V to 2000V, depending on series)
- High average forward current capability (25A up to 400A class modules)
- Low forward voltage drop (VF) for improved efficiency
- High surge current capability (IFSM) for transient and overload conditions
Thermal performance
- Low thermal resistance (junction‑to‑case)
- Designed for efficient heat dissipation when mounted to a heatsink
- High maximum junction temperature rating (typically +150°C)
Mechanical / packaging features
- Molded or metal base power module construction
- Electrically isolated baseplate (where specified) for easier heatsink mounting
- Compact, low‑profile module designs
- Screw‑mount terminals for secure electrical connections
- Standardized package outlines for interchangeability

Reliability and robustness
- High reliability under repetitive switching operation
- Designed to withstand industrial electrical noise and thermal cycling
- High mechanical strength against vibration and shock
- Long operating life under rated conditions
Configuration options
- Single diode and dual diode (common cathode or common anode) configurations
- Series offerings optimized for different voltage/current tradeoffs
- Availability of low‑voltage, high‑current variants (e.g., DBA series)
Compliance and manufacturing quality
- Manufactured under SanRex industrial quality standards
- Designed for industrial, transportation, and energy applications
- RoHS‑compliant materials

Applications

DBA Series (DBA200YA40)
- Low-voltage, high-current rectification
- Output rectifiers for DC power supplies
- Battery charging systems
- DC welding equipment
- Automotive and industrial DC systems
DKR Series (DKR200AB60, DKR300AB60, DKR400AB60, DKR400CA60)
- AC/DC rectifiers for industrial power supplies
- Freewheeling diodes for inverter circuits
- Snubber and clamp circuits
- Motor drive systems (servo and induction motors)
- Switching power supplies
- UPS (Uninterruptible Power Supplies)
- Welding power sources
FDF Series (FDF25CA100-120, FDF60BA50-60)
- High-frequency rectification
- Switching-mode power supplies (SMPS)
- DC chopper circuits
- Freewheeling diodes in transistor/IGBT circuits
- Industrial DC power converters
- Inverter input/output rectification

FDS Series (FDS100CA100-120)
- Fast recovery rectifiers for high-speed switching
- Inverter freewheeling applications
- Power factor correction (PFC) circuits
- Industrial power supplies
- DC motor drives
FRS Series (FRS150BA50, FRS200CA100-120, FRS300BA50, FRS400BA50-60, FRS400CA120, FRS400EA180-20)
- High-current freewheeling diode applications
- Inverter and converter circuits
- AC motor drives and variable frequency drives (VFDs)
- UPS systems
- Induction heating power supplies
- Welding and plasma cutting equipment
- Renewable energy inverters (solar/wind)
- Industrial rectifier bridges