## BAS20WS Surface Mount Switching Diode The **BAS20WS** is a high-voltage, fast-switching diode housed in a small **SOD-323** surface-mount package. It is primarily designed for high-speed switching applications, circuit protection, and signal conditioning. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics typically found in the BAS20WS datasheet: | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | **Repetitive Peak Reverse Voltage** | $V_{RRM}$ | 200 | V | | **Continuous Forward Current** | $I_F$ | 200 | mA | | **Forward Voltage Drop** (at $I_F = 100mA$) | $V_F$ | 1.0 (max) | V | | **Reverse Recovery Time** | $t_{rr}$ | 50 | ns | | **Reverse Current** (at $V_R = 150V$) | $I_R$ | 100 | nA | | **Power Dissipation** | $P_D$ | 200 | mW | --- ### 2. Core Features * **High Voltage Capability:** With a $V_{RRM}$ of 200V, it can handle significant reverse voltage stresses compared to standard signal diodes like the 1N4148. * **Fast Switching:** The 50ns reverse recovery time ($t_{rr}$) makes it suitable for high-frequency signals and rapid transitions. * **Compact Footprint:** The **SOD-323** package is extremely small, making it ideal for high-density PCB layouts in portable electronics. * **Low Leakage:** It exhibits very low reverse leakage current, which improves efficiency and accuracy in sensing circuits. --- ### 3. Internal Structure and Pinout The BAS20WS is a **single diode** device. In the SOD-323 package, the cathode is typically marked with a band. ```text SOD-323 Package +-------|-------+ | | | [Anode] 1 ----|<---- 2 [Cathode] | | | +-------|-------+ (Band) ``` --- ### 4. Typical Applications * **General Purpose Switching:** Turning signals on and off in digital circuits. * **Reverse Polarity Protection:** Protecting low-power sensitive rails from accidental battery reversal. * **Voltage Clamping:** Limiting voltage spikes to protect Integrated Circuits (ICs). * **Signal Steering:** Directing signals in logic gates or communication lines. ---