The **VS-25TTS12FP-M3** is a high-voltage Phase Control Thyristor (SCR) manufactured by Vishay Semiconductors. It is designed for medium-power switching and phase-control applications where reliability and isolation are critical. --- ## 1. Technical Specifications Below are the primary electrical and thermal characteristics of the device: | Parameter | Value | Description | | :--- | :--- | :--- | | **$V_{RRM} / V_{DRM}$** | 1200 V | Peak Repetitive Reverse and Off-State Voltage | | **$I_{T(AV)}$** | 16 A | Maximum Average On-State Current | | **$I_{T(RMS)}$** | 25 A | Maximum RMS On-State Current | | **$I_{TSM}$** | 350 A | Maximum Peak One-Cycle Non-Repetitive Surge Current | | **$V_{TM}$** | 1.25 V | Maximum On-State Voltage Drop (at 25 A) | | **$I_{GT}$** | 45 mA | Max Gate Trigger Current | | **Package** | TO-220 FULL-PAK | Plastic molded, fully isolated package | --- ## 2. Key Features * **Isolated Package:** The "FP" (Full-Pak) designation means the internal chip is electrically isolated from the metal heatsink tab. This allows multiple components to be mounted on a single heatsink without extra insulating pads. * **High Voltage Capability:** Rated at 1200V, making it suitable for 220V/440V AC line applications. * **Low Thermal Resistance:** Designed to dissipate heat efficiently despite the plastic encapsulation. * **M3 Series:** This suffix indicates the device is Halogen-free and RoHS compliant, following modern environmental standards. --- ## 3. Terminal Identification The device follows the standard TO-220 pinout configuration: 1. **Pin 1 (Cathode):** The negative terminal through which current exits the SCR. 2. **Pin 2 (Anode):** The positive terminal through which current enters the SCR. 3. **Pin 3 (Gate):** The control terminal used to trigger the device into conduction. --- ## 4. Typical Applications The VS-25TTS12FP-M3 is commonly found in industrial and consumer electronics for: * **Input Rectification:** Soft-start circuits for power supplies. * **AC Switching:** Solid-state relays and static switching. * **Motor Control:** Variable speed drives for AC motors. * **Battery Chargers:** Regulating charging current. --- ## 5. Circuit Symbol (Example) ```text Anode (A) | | ----- \ / <-- SCR Symbol V ----- / | \ Gate | Cathode (K) (G) ```