The **STPS2170AF** is a high-voltage power Schottky rectifier manufactured by STMicroelectronics. It is specifically designed for high-frequency miniature switched-mode power supplies (SMPS) and high-frequency DC-to-DC converters. --- ### ## Technical Specifications Overview The following table highlights the core electrical characteristics of the STPS2170AF: | Parameter | Symbol | Value | | :--- | :--- | :--- | | **Repetitive Peak Reverse Voltage** | $V_{RRM}$ | 170 V | | **Average Forward Current** | $I_{F(AV)}$ | 2 A | | **Forward Voltage Drop (Max)** | $V_F$ | 0.63 V (at 2A, $T_j=125^\circ C$) | | **Operating Junction Temp** | $T_j$ | -40 to +175 °C | | **Package Type** | - | SMA Flat (Low profile) | --- ### ## Key Features 1. **High Voltage Capability:** Unlike standard Schottky diodes that often top out at 40V or 60V, this part handles up to **170V**, making it suitable for telecom and industrial power rails. 2. **Low Profile Package:** The "AF" suffix denotes the **SMA Flat** package. It has a significantly lower height compared to standard SMA packages, which is critical for slim electronic devices. 3. **Efficiency:** It offers a very low forward voltage drop ($V_F$), which minimizes power loss and heat generation during conduction. 4. **Avalanche Capability:** It is rated for avalanche (clamping energy), providing a safety margin against inductive spikes or transient overvoltages. --- ### ## Typical Applications * **Switch Mode Power Supplies (SMPS):** Used as a secondary-side rectifier. * **DC-DC Converters:** Ideal for step-up (boost) or step-down (buck) converters in industrial equipment. * **Reverse Polarity Protection:** Protecting sensitive circuitry from battery reversal. * **Freewheeling Diode:** Used in motor control or relay driving circuits to dissipate energy from inductive loads. --- ### ## Thermal Design Tip Because the SMA Flat package is small, heat dissipation is primarily achieved through the PCB copper traces. For optimal performance at 2A, ensure a sufficient copper area (solder pads) is provided to act as a heatsink.