## Technical Overview of CMH322522-R82ML The **CMH322522-R82ML** is a surface-mount (SMD) wire-wound chip inductor. It is designed for high-reliability electronic circuits, typically used for signal filtering, resonance, and decoupling in telecommunication and consumer electronics. --- ### 1. Part Number Breakdown Understanding the alphanumeric code reveals the specific physical and electrical properties: | Segment | Value | Meaning | | :--- | :--- | :--- | | **Series** | CMH | High-frequency wire-wound chip inductor | | **Size Code** | 322522 | Dimensions: 3.2mm x 2.5mm x 2.2mm (EIA 1210) | | **Inductance** | R82 | 0.82 microhenries ($\mu$H) | | **Tolerance** | M | ±20% | | **Termination** | L | Lead-free (RoHS compliant) | --- ### 2. Key Electrical Specifications Based on standard industry data for the 3225 series, here are the typical performance parameters: * **Inductance:** $0.82 \mu H$ * **Tolerance:** $\pm 20\%$ (M) * **Quality Factor (Q):** Typically 30 minimum (at test frequency). * **Self-Resonant Frequency (SRF):** High SRF (usually >250 MHz), making it suitable for high-frequency applications. * **DC Resistance (DCR):** Low resistance to minimize power loss and heat generation (approx. 0.30 - 0.50 $\Omega$). * **Rated Current:** The maximum DC current it can handle without overheating or saturating (approx. 400mA - 600mA). --- ### 3. Construction and Materials The component is built using a **wire-wound** architecture: 1. **Core Material:** Usually a Ferrite or Ceramic core depending on the frequency target. 2. **Winding:** Fine copper wire wound around the core to achieve precise inductance. 3. **Encapsulation:** Molded resin or epoxy coating provides mechanical strength and environmental protection. 4. **Terminations:** Tin-plated (Sn) electrodes for excellent solderability. --- ### 4. Common Applications Due to its 1210 footprint and stability, it is commonly found in: * **RF Circuits:** Matching networks and high-frequency filters. * **DC/DC Converters:** Small power supply modules for mobile devices. * **EMI Suppression:** Filtering noise in signal lines. * **Consumer Electronics:** Hard drives, digital cameras, and GPS modules. ---