The **47LAC-101R-R** is a specific surface-mount power inductor manufactured by companies like **Sumida** (or similar manufacturers following the same naming convention). It is designed for use in DC-DC converters and power supply circuits. --- ### 1. Technical Specifications Below is a breakdown of the key electrical and physical characteristics: | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 100 µH (Microhenries) | | **Tolerance** | ±20% (Standard for power inductors) | | **Series** | 47LAC (Low profile, high power density) | | **Termination** | RoHS compliant, Lead-free | | **Package Type** | Surface Mount Device (SMD) | | **Core Material** | Ferrite | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying similar components: - **47L**: Refers to the physical size and series architecture. - **AC**: Indicates the specific winding or core material configuration. - **101**: The inductance code. The first two digits are significant figures, and the third is the multiplier (10 * 10^1 = 100). - **R**: Represents the tolerance (often ±20%). - **-R**: Generally indicates compliance with **RoHS** standards or "Tape and Reel" packaging. --- ### 3. Key Features * **Magnetically Shielded:** The design minimizes Electromagnetic Interference (EMI), making it suitable for high-density PCB layouts near sensitive components. * **Low DC Resistance (DCR):** Engineered to reduce power loss and heat generation during operation. * **Compact Footprint:** Specifically designed for portable electronics where vertical space (height) is limited. --- ### 4. Common Applications This part is typically found in the following types of circuits: 1. **DC-DC Converters:** Stepping voltages up or down in battery-powered devices. 2. **LED Drivers:** Providing stable current to lighting arrays. 3. **Consumer Electronics:** Used in laptops, tablets, and handheld gaming consoles. 4. **Filtering:** Acting as a low-pass filter to smooth out ripples in power supply lines. --- ### 5. Equivalent Replacement Guide If you are sourcing this part or looking for an alternative, check the following parameters against the datasheet: * **Saturation Current ($I_{sat}$):** Ensure the replacement can handle the peak current without the inductance dropping. * **Heating Current ($I_{rms}$):** Ensure the thermal rating matches your environment. * **Dimensions:** Verify the pad layout (Land Pattern) matches your PCB.