## Overview of the STTH Series The **STTH** series refers to a family of **Ultrafast High-Voltage Rectifier Diodes** manufactured primarily by STMicroelectronics. These components are designed for high-frequency power conversion applications where speed and efficiency are critical. ### Key Features and Technology The STTH diodes utilize **Planar** or **Platinum-doped** technology to achieve a balance between low forward voltage drop ($V_F$) and fast recovery time ($t_{rr}$). | Feature | Description | | :--- | :--- | | **High Voltage** | Rated from 200V up to 1200V. | | **Ultrafast Recovery** | Extremely low $t_{rr}$ (often < 25ns to 75ns) to minimize switching losses. | | **High Junction Temp** | Typically rated for $T_j$ up to 175°C. | | **Low Leakage** | Minimal reverse leakage current even at high temperatures. | --- ### Internal Sub-Families The STTH line is often categorized by its specific performance characteristics: 1. **STTHxxR (Standard Ultrafast):** Balanced performance for general-purpose high-frequency rectification. 2. **STTHxxL (Low $V_F$):** Optimized for the lowest possible conduction losses; ideal for low-frequency power supplies. 3. **STTHxxS (Soft Recovery):** Designed to reduce EMI (Electromagnetic Interference) and voltage ringing during switching. --- ### Common Packages STTH diodes are available in various through-hole and surface-mount packages depending on power requirements: * **Through-Hole:** TO-220, TO-247, DO-201AD. * **Surface Mount (SMD):** SMA, SMB, SMC, D2PAK. --- ### Application Use Cases Because of their high speed, STTH parts are found in the following circuits: * **Switch Mode Power Supplies (SMPS):** Used in the output rectification stage. * **PFC (Power Factor Correction):** Acts as the boost diode in active PFC circuits. * **Motor Drives:** Used as freewheeling diodes to protect transistors from inductive spikes. * **Inverters:** Essential for DC-to-AC conversion in solar and UPS systems. --- ### Example Part Numbering Breakdown: `STTH8R06D` | Segment | Meaning | | :--- | :--- | | **STTH** | STMicroelectronics Ultrafast Diode Family | | **8** | Forward Current ($I_F$) = 8 Amperes | | **R** | Sub-family (R = High Performance/Reduced Switching losses) | | **06** | Voltage Rating (06 = 600V) | | **D** | Package Code (D = TO-220AC) |