## Overview of ST230C..C Series The **ST230C..C** series refers to a family of **Phase Control Thyristors** (also known as Silicon Controlled Rectifiers or SCRs) manufactured by companies like Vishay (formerly International Rectifier). These are high-power semiconductor devices designed for switching and phase control applications. ### 1. Key Technical Specifications The ".." in the part number usually denotes the voltage rating (e.g., ST230C16C represents a 1600V device). | Parameter | Symbol | Typical Value | | :--- | :--- | :--- | | **Average On-State Current** | $I_{T(AV)}$ | 410 A (at $T_c = 55^\circ C$) | | **RMS On-State Current** | $I_{T(RMS)}$ | 785 A | | **Voltage Range** | $V_{DRM} / V_{RRM}$ | 400V to 1600V | | **Max Peak One-cycle Surge** | $I_{TSM}$ | 5700 A to 6000 A | | **Gate Trigger Current** | $I_{GT}$ | 150 mA | | **Case Style** | Package | TO-200AB (A-PUK) | --- ### 2. Physical Construction and Package The ST230C..C series uses a **"Press-Pack" (Hockey Puk)** design. Unlike standard transistors with pins, these are disc-shaped components. * **Ceramic Housing:** Provides high insulation and hermetic sealing. * **Pressure Contact:** The device does not have solder leads for the main current. It must be physically clamped between two heat sinks with specific force (typically 4.9 to 9.8 kN) to ensure electrical and thermal contact. * **Gate Lead:** A small wire or terminal used to apply the trigger signal. --- ### 3. Core Functional Electronic Features * **Phase Control:** These are "slow" thyristors optimized for line frequency (50Hz to 60Hz). They are used to control the portion of the AC cycle that conducts current. * **High Surge Capability:** Designed to handle massive current spikes without failure, making them ideal for heavy industrial starts. * **Low Conduction Losses:** They exhibit a very low on-state voltage drop, maximizing efficiency in high-current paths. --- ### 4. Common Applications Due to their high power handling, these parts are found in: 1. **Industrial Motor Drives:** Soft starters and variable speed controls for large DC motors. 2. **Power Supplies:** Large battery chargers and electrochemical plating rectifiers. 3. **Welding:** Controlled power output for heavy-duty arc welders. 4. **Heating Control:** Controlling large resistive heating elements in furnaces. --- ### 5. Part Numbering Example: ST230C16C0 | Code | Meaning | | :--- | :--- | | **ST230** | Basic Series Number (Thyristor) | | **C** | Case Style (Ceramic Puk) | | **16** | Voltage rating ($16 \times 100 = 1600V$) | | **C** | Standard gate and manufacturing specifications | ---