The **PI13067-R40M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to a class of "molded" inductors designed for high efficiency and compact footprints. --- ### 1. Technical Specifications The part number follows a specific nomenclature. Below are the key electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.40 µH (Indicated by "R40") | | **Tolerance** | ±20% (Indicated by "M") | | **DCR (DC Resistance)** | Typical range: 0.5mΩ - 1.2mΩ (Ultra-low) | | **Saturation Current ($I_{sat}$)** | Typically > 50A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | Approx. 13.5mm x 12.6mm x 6.7mm | --- ### 2. Physical Construction The PI13067 series utilizes a **Molded Core** technology: * **Core Material:** Carbonyl iron powder or composite metal alloy. This allows for soft saturation (the inductance doesn't drop off instantly when current increases). * **Shielding:** The molded construction provides inherent magnetic shielding, reducing Electromagnetic Interference (EMI) with neighboring components. * **Lead Frame:** Heavy-duty copper leads to handle high RMS currents without overheating. --- ### 3. Key Features * **High Current Density:** Capable of handling massive surges in current despite its small size. * **Low Audible Noise:** The composite construction minimizes "coil whine" caused by magnetostriction. * **Frequency Range:** Optimized for high-frequency switching power supplies (typically up to 5MHz). --- ### 4. Common Applications This inductor is typically found in high-demand power stages: 1. **Voltage Regulator Modules (VRM):** Used in CPU/GPU power delivery on motherboards. 2. **Point-of-Load (POL) Converters:** In telecommunications and server hardware. 3. **Battery Powered Systems:** High-efficiency DC-DC buck/boost converters. 4. **Automotive Electronics:** Infotainment and ADAS power management. ---