The **CM322522-R22ML** is a surface-mount (SMD) wire-wound chip inductor. It is commonly used in high-frequency circuits for signal processing and power management in compact electronics. ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the component's physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CM** | Series | Wire-wound Chip Inductor series. | | **322522** | Size Metric | Dimensions: 3.2mm x 2.5mm x 2.2mm (EIA 1210). | | **R22** | Inductance Value | **0.22 µH** (R represents the decimal point). | | **M** | Tolerance | **±20%** (Common for high-current/general inductors). | | **L** | Packaging/Finish | Usually denotes Lead-free/RoHS compliance or Tape & Reel. | --- ### 2. Technical Specifications While exact values can vary slightly by manufacturer (such as Bourns or TDK), the standard specifications for a 1210 R22 inductor are: * **Inductance:** 0.22 µH * **Case Size:** 1210 (Inch) / 3225 (Metric) * **Quality Factor (Q):** Typically 20–30 (measured at a specific frequency, e.g., 25.2 MHz). * **Self-Resonant Frequency (SRF):** High, usually around 450 MHz. * **DC Resistance (DCR):** Low, typically < 0.50 Ω. * **Rated Current:** Usually ranges between 400mA to 550mA depending on the specific series. --- ### 3. Construction and Features * **Wire-Wound Core:** Uses a copper wire wrapped around a ceramic or ferrite core. This provides higher Q factors and higher current handling compared to multilayer inductors. * **Encapsulation:** Often coated in an epoxy resin to protect the windings from environmental moisture and physical damage. * **Small Footprint:** The 1210 (3.2 x 2.5mm) size is ideal for automated pick-and-place assembly. --- ### 4. Common Applications Due to its moderate inductance and high frequency response, it is found in: 1. **Telecommunications:** Filtering noise in RF circuits and mobile phones. 2. **Consumer Electronics:** Power supply decoupling in tablets and laptops. 3. **Automotive:** Infotainment systems and sensor modules. 4. **Signal Lines:** Used to prevent EMI (Electromagnetic Interference) in high-speed data lines. ---