The **TP4212-470M-R** is a specific surface-mount (SMD) power inductor. Components like these are critical in power management circuits, specifically for filtering and energy storage. Below is a detailed breakdown of its electronic specifications and characteristics. --- ## 1. Technical Specifications The part number follows a standard naming convention used by manufacturers like **Tri-Mag (a division of Curtis Industries)** or similar passive component specialists. | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 47 $\mu$H | | **Tolerance** | ±20% (indicated by 'M') | | **Inductor Type** | Shielded Power Inductor | | **Mounting Type** | Surface Mount (SMD) | | **DC Resistance (DCR)** | Typ. ~0.20 - 0.28 $\Omega$ (varies by exact batch) | | **Saturation Current ($I_{sat}$)** | Typically 0.8A to 1.2A | | **Dimensions (Footprint)** | Approx. 4.0mm x 4.0mm x 1.2mm | --- ## 2. Key Features ### A. Magnetic Shielding The TP4212 series is generally **shielded**. This means the ferrite core encapsulates the winding, which: * Reduces Electromagnetic Interference (EMI). * Prevents the inductor's magnetic field from affecting neighboring components on a high-density PCB. ### B. Low Profile The "12" in the suffix often refers to the height (1.2mm). This makes it ideal for thin electronics like smartphones, tablets, and portable IoT devices. ### C. Construction * **Core Material:** Ferrite. * **Termination:** Lead-free (RoHS compliant) tin plating. --- ## 3. Circuit Applications This component is primarily used in **DC-DC Converters**. Its role depends on the circuit topology: 1. **Buck Converters (Step-Down):** It stores energy during the "ON" cycle of the switching transistor and releases it to the load during the "OFF" cycle to maintain a steady current. 2. **Decoupling/Filtering:** Used in LC filters to smooth out ripple voltage and noise from high-frequency switching power supplies. 3. **LED Drivers:** Provides constant current regulation for backlight circuits. --- ## 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **TP** | Series Identifier (Power Inductor) | | **4212** | Package Size (4.0x4.0mm footprint, 1.2mm height) | | **470** | Inductance Code (47 + 0 zeros = 47$\mu$H) | | **M** | Tolerance (M = ±20%, L = ±15%, K = ±10%) | | **R** | Packaging (usually signifies Tape & Reel) |