The **LP404R-R36M** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to a category of low-profile, high-current inductors designed for high-density electronic assemblies. --- ### 1. Key Technical Specifications Based on the standard nomenclature for this series, here are the typical technical parameters: | Parameter | Specification (Typical) | | :--- | :--- | | **Inductance** | 0.36 µH (indicated by "R36") | | **Tolerance** | ±20% (indicated by "M") | | **DCR (Direct Current Resistance)** | Very Low (mΩ range) | | **Saturation Current ($I_{sat}$)** | High (typically 15A - 25A depending on size) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Shielded, Composite Iron Powder | --- ### 2. Breakdown of the Part Number Understanding the alphanumeric code helps in identifying the component's physical and electrical characteristics: * **LP**: Series prefix (often stands for Low Profile/Power). * **4040**: Refers to the physical footprint size (typically $4.0 \text{mm} \times 4.0 \text{mm}$). * **R**: Designates the specific material or packaging revision. * **R36**: The Inductance value. "R" acts as a decimal point, meaning $0.36 \mu\text{H}$. * **M**: The tolerance code. $M = \pm 20\%$. --- ### 3. Core Features and Benefits * **Magnetic Shielding:** The component is molded with a magnetic metal powder core, which reduces electromagnetic interference (EMI) and prevents noise from affecting nearby components. * **High Saturation:** Designed to handle high peak currents without the inductance dropping significantly (soft saturation characteristics). * **Low DCR:** Minimizes power loss as heat, leading to higher efficiency in power supply circuits. * **Compact Footprint:** Ideal for space-constrained designs like smartphones, laptops, and IoT devices. --- ### 4. Typical Applications The LP404R-R36M is primarily found in: 1. **Voltage Regulator Modules (VRM):** For CPUs and GPUs. 2. **Point of Load (POL) Converters:** Converting a main bus voltage to a lower voltage for specific chips. 3. **DC-DC Step-down (Buck) Converters:** Used in battery-powered handheld devices. 4. **Automotive Electronics:** Used in infotainment and ADAS sensors due to high-temperature stability. --- ### 5. Footprint/Land Pattern Example When designing a PCB for this part, the landing pads must accommodate the bottom-side terminals: ```text [ Pad 1 ] <--- 4.0mm ---> [ Pad 2 ] +-------+ +-------+ | | | | | | (Body) | | +-------+ +-------+ ```