The **SDH3812-101-R** is a low-profile, shielded surface-mount (SMT) power inductor. It is commonly used in DC-DC converter applications where space is limited and electromagnetic interference (EMI) must be minimized. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical properties: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 100 µH (Microhenries) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~1.42 Ω (Typical) | | **Rated Current (Irms)** | ~0.33 A | | **Saturation Current (Isat)** | ~0.35 A | | **Package Size** | 3.8mm x 3.8mm x 1.2mm | | **Shielding** | Magnetically Shielded | | **RoHS Status** | Compliant (-R suffix) | --- ### 2. Physical Construction The "SDH" series is designed for high-density circuit boards. Its construction features include: * **Ferrite Drum Core:** Provides high permeability for effective energy storage. * **Magnetic Shielding:** A ferrite sleeve or resin coating surrounds the coil to contain the magnetic field, preventing interference with nearby sensitive components. * **Low Profile:** The 1.2mm height makes it ideal for ultra-thin electronics like smartphones, tablets, and wearables. --- ### 3. Key Electronic Functions The SDH3812-101-R performs three primary roles in a circuit: 1. **Energy Storage:** In switching regulators (Buck/Boost converters), it stores energy in its magnetic field during the "on" cycle and releases it during the "off" cycle. 2. **Filtering:** It works with capacitors to smooth out ripple current, converting a pulsing square wave into a steady DC voltage. 3. **EMI Suppression:** Because it is shielded, it significantly reduces radiated noise that could interfere with RF signals or high-speed data lines. --- ### 4. Common Applications * **Mobile Devices:** Power management for displays or CPU rails in handheld electronics. * **IoT Sensors:** Efficient power conversion for battery-operated wireless nodes. * **LED Drivers:** Providing constant current for backlighting applications.