The **LP4040R-R60M** is a high-current, low-profile power inductor typically used in DC-DC converter applications. It is designed to handle high frequencies and provide stable inductance under significant current loads. ### 1. Part Number Breakdown Understanding the nomenclature helps identify its physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **LP** | Series Prefix | Low Profile / High Current series | | **4040** | Case Size | Dimensions (approx. 4.0mm x 4.0mm) | | **R** | Core Material | Often refers to Carbonyl Powder or Metal Alloy core | | **R60** | Inductance Value | 0.60 µH (Microhenries) | | **M** | Tolerance | ±20% | --- ### 2. Technical Specifications While exact specifications can vary slightly by manufacturer (such as Link-PP or Sunlord), the standard parameters for a 4040 R60M inductor are: * **Inductance:** 0.60 µH * **Tolerance:** ±20% * **DC Resistance (DCR):** Very low (typically < 10mΩ) to minimize power loss. * **Saturation Current ($I_{sat}$):** The current at which inductance drops by a specified percentage (usually 30%). For this size, it is typically between **10A - 15A**. * **Heating Current ($I_{rms}$):** The current that causes a 40°C temperature rise. Generally matches or is slightly lower than $I_{sat}$. * **Operating Temperature:** -40°C to +125°C. --- ### 3. Key Construction Features 1. **Shielded Design:** Most parts in this series are magnetically shielded. This reduces Electromagnetic Interference (EMI), preventing the inductor from interfering with nearby sensitive components. 2. **Metal Alloy Core:** Uses iron powder or alloy molding. This allows for "soft saturation" characteristics, meaning the inductance doesn't drop off abruptly when current increases. 3. **SMD Mounting:** Surface Mount Device pads for automated PCB assembly. --- ### 4. Common Applications Due to its low inductance and high current capability, the LP4040R-R60M is ideal for: * **Voltage Regulator Modules (VRMs):** Used in CPUs and GPUs. * **DC-DC Buck Converters:** High-frequency switching power supplies. * **Battery Powered Devices:** Smartphones and tablets where space is limited but power efficiency is critical. * **POL (Point of Load) Converters:** Distributed power systems. ---