The **ST1230C..KP** series refers to high-power **Phase Control Thyristors (SCRs)** manufactured by Vishay (formerly International Rectifier). These devices are designed for heavy-duty industrial applications requiring high current and voltage regulation. --- ## 1. Technical Specifications The ST1230C series is categorized as a "Hockey Puk" or "Press-Pack" thyristor due to its physical shape and mounting style. | Feature | Description | Typical Value (Range) | | :--- | :--- | :--- | | **Device Type** | Phase Control SCR | Standard Recovery | | **IT(AV)** | Max Average On-State Current | ~1230 A @ $T_C = 55^\circ C$ | | **VDRM / VRRM** | Repetitive Peak Voltage | 800V to 1600V (depending on suffix) | | **ITSM** | Max Peak One-cycle Surge | ~20,000 A to 24,000 A | | **VTM** | Max On-state Voltage Drop | ~1.55 V | | **Package** | Press-Pack | B-PUK (A-24) | --- ## 2. Key Features * **High Current Capacity:** Capable of handling over 1200 Amperes, making it suitable for large-scale power distribution. * **Double-Side Cooling:** The Hockey Puk design allows heat to be dissipated from both the top and bottom surfaces when clamped between heatsinks. * **High Surge Capability:** Excellent robustness against momentary current spikes. * **International Standard Case:** The B-PUK (A-24) outline is an industry standard, ensuring compatibility with various heatsink assemblies. --- ## 3. Part Number Decoding The alphanumeric string follows a specific logic to define the component's capabilities: | Code | Meaning | | :--- | :--- | | **ST** | Standard Thyristor | | **1230** | Current Rating (Approx. $I_{T(AV)}$ in Amps) | | **C** | Ceramic Puk (Housing material) | | **12** | Voltage code (e.g., $12 \times 100 = 1200V$) | | **K** | High Voltage / Package configuration | | **P** | Lead-free (RoHS compliant) | --- ## 4. Common Applications Due to their ability to control large amounts of power with a small gate signal, these thyristors are used in: 1. **Industrial DC Drives:** Controlling the speed of large industrial motors. 2. **AC Soft Starters:** Reducing inrush current during motor startup. 3. **High Power Rectifiers:** Used in electroplating, electrolysis, and battery charging stations. 4. **SVC (Static Var Compensators):** Used in power grids for reactive power compensation. --- ### Important Installation Note Since this is a **Press-Pack** device, it does not have mounting holes. It requires a specific **clamping force** (usually expressed in kilonewtons, e.g., 22kN) to ensure proper electrical and thermal contact with the heatsink. Failure to apply the correct pressure will lead to immediate device failure due to overheating.