The **BAT54S-AE3-R** is a specific variant of the widely used BAT54 series. It is a **Schottky Barrier Diode** configured in a dual-diode "series" arrangement, housed in a small surface-mount package. --- ## 1. Technical Specifications Below are the key electrical characteristics of the BAT54S-AE3-R: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Continuous Reverse Voltage** | $V_R$ | 30 | Volts (Max) | | **Forward Continuous Current** | $I_F$ | 200 | mA (Max) | | **Forward Voltage Drop** | $V_{F}$ | ~320mV @ 1mA / 1V @ 100mA | Volts | | **Reverse Recovery Time** | $t_{rr}$ | 5 | ns (Max) | | **Operating Temperature** | $T_j$ | -55 to +125 | °C | | **Package Type** | SOT-23 | Standard 3-lead | --- | --- ## 2. Internal Configuration The "S" in BAT54S denotes the **Series Configuration**. - **Pin 1:** Anode of Diode 1 - **Pin 2:** Cathode of Diode 2 - **Pin 3:** Common point (Cathode of Diode 1 and Anode of Diode 2) This layout is particularly useful for clipping circuits or protecting signal lines from both positive and negative over-voltage spikes. --- ## 3. Key Features and Advantages ### High Speed Switching Because it is a Schottky diode, it relies on a metal-semiconductor junction rather than a P-N junction. This results in an ultra-fast switching speed ($t_{rr} < 5ns$), making it ideal for high-frequency signal processing. ### Low Forward Voltage ($V_F$) The low turn-on voltage (significantly lower than standard silicon diodes like the 1N4148) reduces power loss and allows for more efficient low-voltage signal clamping. ### Compact Footprint The **AE3** suffix typically refers to the **SOT-23** package (though this can vary slightly by manufacturer naming conventions like UTC). The **-R** suffix generally indicates **Tape & Reel** packaging for automated assembly. --- ## 4. Common Applications * **Signal Clamping:** Protecting IC inputs by clamping the voltage to the supply rails. * **Reverse Polarity Protection:** Used in low-current battery-powered devices. * **Voltage Doublers:** Due to the dual-diode series configuration in one package. * **Fast Switching:** High-speed logic or communication lines. ---