The **LLM3225-R68H** is a surface-mount (SMD) wire-wound chip inductor. This specific part number follows standard industry naming conventions for passive electronic components. ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify its physical and electrical characteristics: | Code | Component Detail | Description | | :--- | :--- | :--- | | **LLM** | Series/Type | Wire-wound chip inductor (often specific to a manufacturer's series). | | **3225** | Package Size | Metric 3225 (3.2mm x 2.5mm) or Imperial 1210. | | **R68** | Inductance Value | **0.68 µH** (R acts as a decimal point). | | **H** | Tolerance | Typically ±3% or ±5% (depending on the manufacturer's datasheet). | --- ### 2. Technical Specifications (Typical) While exact specs can vary slightly between manufacturers (like Taiyo Yuden or Murata), the general parameters for a 3225-R68H are as follows: * **Inductance:** 0.68 Microhenries (µH). * **DC Resistance (DCR):** Usually very low (range of 0.1Ω to 0.5Ω) to minimize power loss. * **Rated Current:** Typically ranges from 400mA to 800mA, depending on the wire gauge and core material. * **Self-Resonant Frequency (SRF):** High frequency (often >200 MHz), making it suitable for RF applications. * **Operating Temperature:** Generally -40°C to +125°C. --- ### 3. Construction and Material The "Wire-Wound" construction distinguishes it from multilayer inductors: * **Core Material:** Usually a Ferrite or Ceramic core. Ferrite provides higher inductance and current handling, while Ceramic is used for higher frequency stability. * **Structure:** Fine copper wire is wound around a core and terminated at metallic electrodes on the ends. ### 4. Common Applications Due to its size and inductance value, the LLM3225-R68H is frequently found in: 1. **Power Management:** Used in DC-DC converter circuits for mobile devices. 2. **RF Circuits:** Impedance matching and filtering in telecommunication equipment. 3. **Noise Suppression:** Decoupling and filtering high-frequency noise in signal lines. --- ### 5. Footprint (Land Pattern) For PCB design, use the standard **1210 (Imperial)** footprint. ```text 3.2mm (Length) x 2.5mm (Width) Height: Usually 1.6mm to 2.2mm ```