The **LPF3513T-331M** is a high-performance power inductor, typically categorized as a surface-mount device (SMD) used in power management and filtering circuits. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **LPF** | Series Name | Low Profile Power Inductor | | **3513** | Dimensions | Approx. 3.5mm x 3.5mm x 1.3mm | | **T** | Packaging | Tape and Reel | | **331** | Inductance Code | $33 \times 10^1 = 330 \mu H$ | | **M** | Tolerance | $\pm 20\%$ | --- ### 2. Technical Specifications While exact specifications can vary slightly by manufacturer (such as Taiyo Yuden or Chilisin), the general parameters for this part are: * **Inductance:** $330 \mu H$ * **DC Resistance (DCR):** High (relative to lower inductance values), typically in the range of $3 \Omega$ to $5 \Omega$. * **Rated Current ($I_{sat}$):** Usually between $150mA$ to $250mA$. * **Operating Temperature:** $-40^\circ C$ to $+125^\circ C$ (including self-heating). * **Shielding:** Usually magnetically shielded to minimize Electromagnetic Interference (EMI). --- ### 3. Key Electronic Functions The LPF3513T-331M serves several critical roles in a circuit: 1. **Energy Storage:** In DC-DC converters (Buck or Boost), it stores energy in its magnetic field during the switching cycle. 2. **Filtering:** Due to its high inductance ($330 \mu H$), it is excellent at smoothing out high-frequency noise and ripples in power lines. 3. **EMI Suppression:** The shielded construction prevents the magnetic flux from interfering with adjacent sensitive components on the PCB. --- ### 4. Typical Applications Because of its small footprint and relatively high inductance, it is found in: * **LCD Displays:** Powering the backlight or bias circuits. * **Portable Electronics:** Smartphones, tablets, and wearables where height (1.3mm) is restricted. * **Sensors:** Filtering power for low-current analog sensors. --- ### 5. Footprint (Top View) ```text 3.5mm +---------+ | | | (331) | 3.5mm | | +---------+ Height: 1.3mm ```