The **HMLQ25201T-R47MSR** is a high-performance, miniature power inductor typically used in power management circuits (DC-DC converters). It belongs to the family of metal alloy multilayer inductors, designed for high-density electronic assemblies like smartphones and wearable devices. --- ### 1. Key Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.47 µH | Nominal inductance at 1MHz | | **Tolerance** | ±20% (M) | Standard tolerance for power inductors | | **Case Size** | 2520 (Metric) | 2.5mm x 2.0mm x 1.0mm (max height) | | **DC Resistance (DCR)** | ~21 mΩ (Typ) | Low resistance to minimize power loss | | **Saturation Current ($I_{sat}$)** | ~5.5 A | Current at which inductance drops by 30% | | **Rated Current ($I_{rms}$)** | ~4.5 A | Based on a 40°C temperature rise | | **Material** | Metal Alloy | Magnetic powder core for high saturation | --- ### 2. Breakdown of the Part Number The alphanumeric code follows a specific naming convention used by manufacturers (like Chilisin or similar high-frequency component makers): * **HMLQ**: Series name (usually High-current, Metal Alloy, Low Profile). * **25201T**: Dimensions (2.5mm x 2.0mm) and thickness/type. * **R47**: Inductance value ($0.47 \mu H$). * **M**: Tolerance ($\pm 20\%$). * **SR**: Specific internal coding for material or packaging style (e.g., Standard/RoHS). --- ### 3. Features and Advantages * **High Saturation Current:** Unlike traditional ferrite inductors, the metal alloy core allows for a "soft saturation" characteristic, preventing sudden drops in performance during current spikes. * **Low Profile:** The "10" or "1T" in the code often denotes a height of 1.0mm, making it ideal for slim electronic devices. * **Magnetic Shielding:** The molded construction provides excellent EMI (Electromagnetic Interference) shielding, reducing noise in sensitive circuits. * **Low DCR:** Efficiently handles high current with minimal heat generation. --- ### 4. Typical Applications 1. **Smartphones & Tablets:** Used in CPU/GPU power rails. 2. **DC-DC Converters:** Essential for Buck/Boost regulators. 3. **IoT Devices:** Provides power efficiency in battery-operated sensors. 4. **SSD/HDD:** Voltage regulation for high-speed data storage.