## SD103CWH Schottky Barrier Diode The **SD103CWH** is a small-signal Schottky barrier diode, typically housed in the **SOD-123** surface-mount package. It is designed for high-frequency applications, fast switching, and low voltage rectification. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the SD103CWH: | Parameter | Symbol | Value | Unit | | :--- | :---: | :---: | :---: | | Peak Repetitive Reverse Voltage | $V_{RRM}$ | 40 | V | | RMS Reverse Voltage | $V_{R(RMS)}$ | 28 | V | | Maximum Average Forward Current | $I_{F(AV)}$ | 350 | mA | | Forward Voltage Drop (@ $I_F = 200mA$) | $V_F$ | 0.60 | V | | Maximum Reverse Current (@ $V_R = 30V$) | $I_R$ | 5.0 | µA | | Reverse Recovery Time | $t_{rr}$ | 10 | ns | --- ### 2. Physical & Material Properties * **Package Type:** SOD-123 (Small Outline Diode). * **Construction:** Silicon Epitaxial Planar. * **Terminals:** Lead-free (RoHS compliant), usually matte tin-plated. * **Polarity:** Band denotes the **Cathode** end. * **Thermal Resistance:** Approximately 500 °C/W (Junction to Ambient). --- ### 3. Core Features & Advantages * **Low Forward Voltage ($V_F$):** Compared to standard PN junction diodes (which have a $V_F$ of ~0.7V), the Schottky barrier allows for lower power dissipation and higher efficiency. * **Fast Switching:** With a reverse recovery time ($t_{rr}$) of roughly 10ns, it is suitable for high-speed signal processing. * **Guard Ring Protection:** The internal structure usually includes a guard ring for over-voltage protection and to minimize leakage currents. --- ### 4. Common Applications 1. **Switching Power Supplies:** Used in low-voltage DC-DC converters. 2. **Clamping Circuits:** Protects sensitive IC inputs from voltage spikes. 3. **Reverse Polarity Protection:** Prevents damage if batteries or power sources are connected incorrectly (in low-current circuits). 4. **Signal Demodulation:** Used in RF detection due to its fast response time.