The **PI13038-R15M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-frequency power supplies. It belongs to a class of "Molded Power Inductors" designed for high efficiency and low electromagnetic interference (EMI). --- ## 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics of the component: | Segment | Meaning | Description | | :--- | :--- | :--- | | **PI** | Series | Indicates Power Inductor (Molded type) | | **13038** | Dimensions | Roughly 13.5mm x 12.6mm (Footprint) and 3.8mm (Height) | | **R15** | Inductance | **0.15 µH** (R denotes decimal point) | | **M** | Tolerance | **±20%** tolerance on the inductance value | --- ## 2. Technical Specifications While exact values can vary slightly by manufacturer (e.g., Cyntec, Mag.Layers), the standard specs for an R15 (0.15µH) inductor in this frame size are: * **Inductance:** 0.15 µH * **DC Resistance (DCR):** Extremely low, typically between **0.5mΩ to 0.9mΩ**. This minimizes power loss through heat. * **Saturation Current ($I_{sat}$):** Typically ranges from **50A to 70A**. This is the current at which inductance drops by ~30%. * **Heating Current ($I_{rms}$):** Typically ranges from **35A to 50A**. This is the current that causes a 40°C temperature rise. * **Operating Temperature:** -55°C to +125°C. --- ## 3. Key Features * **Molded Construction:** The coil is encapsulated in a metal iron powder composite. This provides a "soft saturation" characteristic and excellent magnetic shielding. * **Low Profile:** The "38" in the name indicates a max height of 3.8mm or 4.0mm, making it suitable for thin devices like laptops or servers. * **High Frequency:** Optimized for high-speed switching frequencies (up to 5MHz). * **Acoustic Quietness:** The molded design reduces "coil whine" (magnetostriction noise). --- ## 4. Common Applications Due to its high current handling and low inductance, it is primarily found in: 1. **Voltage Regulator Modules (VRM):** Specifically for CPU and GPU power phases. 2. **Point of Load (POL) Converters:** Used in servers and networking hardware. 3. **Battery Powered Systems:** Where high efficiency is required to extend battery life. 4. **Distributed Power Systems:** High-current DC-DC buck converters. ---