The **FST7335M** is a high-power Schottky Barrier Rectifier module typically used in industrial power supplies and heavy-duty motor control applications. It is designed to handle high currents while maintaining a low forward voltage drop to maximize efficiency. --- ### ## Technical Specifications Below are the key electronic characteristics of the FST7335M: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Average Forward Current ($I_{F(AV)}$)** | 70 Amperes | The continuous current the device can handle. | | **Maximum Repetitive Reverse Voltage ($V_{RRM}$)** | 35 Volts | The maximum voltage it can block in reverse mode. | | **Forward Voltage Drop ($V_F$)** | ~0.60V - 0.70V | The voltage lost across the diode when conducting. | | **Operating Junction Temp** | -55°C to +150°C | The safe thermal range for the semiconductor. | | **Configuration** | Dual Diode (Common Cathode) | Two diodes sharing a center pin in one package. | --- ### ### Key Features and Components 1. **Schottky Barrier Technology**: Unlike standard PN junction diodes, it uses a metal-to-semiconductor junction. This results in **ultra-fast switching** speeds and significantly lower power loss due to reduced forward voltage. 2. **Package Style (TO-249/Custom Module)**: It usually comes in a rugged, bolt-down power module package. This design is optimized for mounting onto large heat sinks to dissipate the heat generated by 70A of current. 3. **Guard Ring Protection**: Internally, the chip features a "Guard Ring" for transient protection. This helps the part survive high-voltage spikes and improves long-term reliability. --- ### ### Typical Applications * **Switching Power Supplies (SMPS)**: Used in the output stage to rectify high-frequency AC to DC. * **Battery Chargers**: Efficiently handles high charging currents with minimal heat. * **ORing Diodes**: Used in redundant power systems to prevent backflow from one power supply to another. * **Free-wheeling Diodes**: Protects circuits from inductive kicks in motor control. --- ### ### Comparison: Schottky vs. Standard Rectifier | Feature | FST7335M (Schottky) | Standard Diode | | :--- | :--- | :--- | | **Switching Speed** | Extremely Fast | Fast to Slow | | **Forward Loss** | Low (Efficiency High) | High (Efficiency Low) | | **Reverse Leakage** | Higher | Lower |