The **FST5035** is a high-power Schottky Barrier Rectifier diode. It is commonly used in industrial power supplies and high-frequency switching circuits due to its low forward voltage drop and high switching speed. --- ### 1. Key Technical Specifications The FST5035 belongs to a class of power semiconductors designed for heavy-duty rectification. | Parameter | Value | Description | | :--- | :--- | :--- | | **Peak Repetitive Reverse Voltage ($V_{RRM}$)** | 35V | The maximum voltage it can block in reverse. | | **Average Rectified Current ($I_{O}$)** | 50A | Total current capacity (usually 25A per leg). | | **Forward Voltage Drop ($V_{F}$)** | ~0.55V - 0.65V | Typical voltage loss at rated current. | | **Operating Temperature** | -55°C to +150°C | Maximum junction temperature range. | | **Package Type** | TO-249 / TO-3P / SOT-227 | Varies by manufacturer (e.g., Microsemi, GeneSiC). | --- ### 2. Physical Configuration The FST5035 is typically a **Common Cathode** dual diode. This means it contains two diode chips inside a single package sharing a middle terminal. * **Pin 1:** Anode 1 * **Pin 2:** Common Cathode (Output) * **Pin 3:** Anode 2 --- ### 3. Electronic Characteristics #### A. Schottky Technology Unlike standard silicon diodes, the FST5035 uses a metal-to-semiconductor junction. This results in: * **Zero Reverse Recovery Time:** Ideal for high-speed switching. * **Lower Heat Generation:** Due to the lower forward voltage drop. #### B. Guard Ring Protection Most high-quality FST5035 modules incorporate a "Guard Ring" for transient protection. This helps the component survive voltage spikes and reduces the risk of "thermal runaway." --- ### 4. Typical Applications The FST5035 is widely used in the following electronic systems: 1. **Switching Mode Power Supplies (SMPS):** Used for secondary-side rectification. 2. **Battery Chargers:** Efficiently converting AC to DC for high-current charging. 3. **Free-Wheeling Diodes:** Protecting inductive loads (motors, solenoids) from back-EMF. 4. **Solar Power Converters:** Used in bypass circuits to prevent reverse current flow. --- ### 5. Implementation Example (Wiring) When using the FST5035 in a full-wave center-tap rectifier circuit: ```text Transformer Secondary (Tap A) ----> [Anode 1] [Common Cathode] ----> DC Output (+) Transformer Secondary (Tap B) ----> [Anode 2] ```