## VS-ST223C..C Series Phase Control Thyristors The **VS-ST223C..C** series consists of phase control thyristors (Silicon Controlled Rectifiers or SCRs) designed in a "Hockey Puk" (press-fit) package. These components are primarily used for high-power switching and phase control applications in industrial environments. --- ### 1. Key Technical Specifications The ".." in the part number typically denotes the voltage rating (e.g., VS-ST223C04C refers to 400V). | Parameter | Symbol | Typical Value | | :--- | :--- | :--- | | **Average On-State Current** | $I_{T(AV)}$ | 390 A (at $T_C = 55^\circ C$) | | **RMS On-State Current** | $I_{T(RMS)}$ | 745 A | | **Voltage Range ($V_{DRM}/V_{RRM}$)** | $V_{RRM}$ | 400V to 1200V | | **Peak Surge Current (50Hz)** | $I_{TSM}$ | 5850 A | | **Max Junction Temperature** | $T_J$ | -40 to +125 °C | | **Package Type** | Case Style | TO-200AB (B-PUK) | --- ### 2. Major Features * **High Surge Capability:** Designed to handle significant overcurrent surges, making them robust for motor starting. * **Diffusion Process:** Uses a diffused glass-to-metal seal for high reliability. * **Low Thermal Resistance:** The hockey puk design allows for double-sided cooling, significantly improving heat dissipation. * **International Standards:** Compliant with JEDEC standards for TO-200AB packages. --- ### 3. Common Applications These thyristors are used in circuits requiring precise control of high AC or DC power: 1. **DC Motor Control:** Variable speed drives for industrial machinery. 2. **Power Supplies:** Controlled rectifiers for battery charging or plating. 3. **AC Soft Starters:** Reducing inrush current in large induction motors. 4. **Heating Control:** Managing power levels in industrial furnaces and ovens. 5. **Welding Equipment:** High-current switching for arc welding. --- ### 4. Mechanical & Installation Note Because the **VS-ST223C..C** is a "puk" type device, it does not have mounting holes. It must be installed between two heatsinks using a **mounting clamp**. The performance is highly dependent on the "Clamping Force" applied, which ensures both electrical contact and thermal transfer.