## Technical Overview: VS-ST1000C..K Series The **VS-ST1000C..K** is a high-power, phase-control thyristor (Silicon Controlled Rectifier or SCR) manufactured by Vishay. It is designed for industrial applications requiring high current handling and robust voltage blocking capabilities. It is typically housed in a "Hockey Puk" (Press-Pack) ceramic case. --- ### 1. Key Technical Specifications The ".." in the part number represents the voltage code (e.g., 12, 16, 24). | Parameter | Symbol | Typical Value | Unit | | :--- | :--- | :--- | :--- | | **Max average on-state current** | $I_{T(AV)}$ | 1000 | A | | **Max RMS on-state current** | $I_{T(RMS)}$ | 1970 | A | | **Peak off-state/reverse voltage** | $V_{DRM}/V_{RRM}$ | 1200 to 2400 | V | | **Peak non-repetitive surge current** | $I_{TSM}$ | 17800 (at 50Hz) | A | | **Maximum junction temperature** | $T_j$ | -40 to +125 | °C | | **Package style** | Case | B-PUK (TO-200AC) | - | --- ### 2. Functional Components 1. **Silicon Wafer:** A large-diameter diffused silicon slice that acts as the semiconductor heart. It uses a four-layer (P-N-P-N) structure. 2. **Gate Lead:** A high-quality trigger wire that initiates the "on" state when a small current pulse is applied. 3. **Ceramic Housing:** A hermetically sealed ceramic body that provides high electrical insulation and physical protection against harsh environments. 4. **Copper Contacts:** Large, flat metal surfaces on the top (Anode) and bottom (Cathode) designed to be compressed under high pressure to ensure low electrical and thermal resistance. --- ### 3. Key Electronic Characteristics * **Phase Control:** This device is optimized for line frequency (50Hz/60Hz) applications. It allows for precise control of the power delivered to a load by varying the trigger angle of the gate. * **High Surge Capability:** The $I_{TSM}$ rating allows the device to withstand massive short-term current spikes without immediate failure, which is critical for motor starting. * **Press-Pack Design:** Unlike bolted modules, the "K" (Hockey Puk) series requires external clamping force. This ensures double-sided cooling, significantly improving heat dissipation compared to single-sided modules. --- ### 4. Common Applications * **High Power Drives:** Used in large DC motor controllers and soft starters. * **Industrial Heating:** Controlling large resistive loads like furnaces and ovens. * **Power Supplies:** Large-scale rectifiers for electrochemical processes (plating, electrolysis). * **AC Switches:** Solid-state contactors for heavy industrial machinery. ---