The **LSMH-2012-R39M-B** is a surface-mount (SMD) power inductor commonly used in compact electronic devices. This specific part number follows a standard nomenclature used by manufacturers like **Laird Performance Materials** or similar magnetic component specialists. --- ### 1. Part Number Breakdown The alphanumeric code provides the technical specifications of the component: | Segment | Meaning | Value | | :--- | :--- | :--- | | **LSMH** | Series Name | High-current shielded power inductor | | **2012** | Package Size | 2.0mm x 1.2mm (EIA 0805) | | **R39** | Inductance Value | 0.39 µH (R denotes decimal point) | | **M** | Tolerance | ±20% | | **B** | Packaging/Revision | Typically refers to Bulk or a specific design revision | --- ### 2. Key Technical Specifications While exact values can vary slightly by manufacturer, the 2012-R39M series generally adheres to the following electrical profile: * **Inductance:** 0.39 µH * **DC Resistance (DCR):** Low (typically between 20mΩ to 50mΩ) to minimize power loss. * **Saturation Current (Isat):** The current at which inductance drops by ~30%. Usually high for its size (approx. 2A - 4A). * **Rated Current (Irms):** The current that causes a specific temperature rise (usually 40°C). * **Shielding:** Magnetic shielding to reduce Electromagnetic Interference (EMI). --- ### 3. Construction and Material * **Core Material:** Usually a Metal Alloy powder or Ferrite core. Metal alloys are preferred for high-current applications because they offer "soft saturation" (a gradual drop in inductance rather than a sudden crash). * **Mounting:** SMD (Surface Mount Device) for automated PCB assembly. * **Form Factor:** Low profile, making it ideal for thin devices like smartphones or wearable tech. --- ### 4. Typical Applications Because of its small footprint (0805 size) and high current handling, it is primarily used in: 1. **DC-DC Converters:** Voltage regulation in mobile devices. 2. **Power Management Integrated Circuits (PMICs):** Filtering and energy storage. 3. **IoT Devices:** Providing stable power to sensors and microcontrollers. 4. **Portable Electronics:** Tablets, cameras, and laptops where space is at a premium. ---