The **CMH322522-R15ML** is a surface-mount (SMD) wire-wound chip inductor. It is commonly used in high-frequency circuits for noise filtering, signal processing, and decoupling. ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify its specific electronic characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CMH** | Series Prefix | High-frequency multilayer/wire-wound chip inductor series. | | **322522** | Case Size | Dimensions: 3.2mm x 2.5mm x 2.2mm (EIA 1210). | | **R15** | Inductance Value | **0.15 µH** (R denotes decimal point). | | **M** | Tolerance | **±20%** (Standard industrial tolerance). | | **L** | Termination/Packaging | Typically denotes Lead-free (RoHS compliant) or Tape & Reel. | --- ### 2. Technical Specifications The device operates based on electromagnetic induction to resist changes in current flow. * **Inductance:** 0.15 µH * **DC Resistance (DCR):** Low (typically < 0.50 Ω), minimizing power loss. * **Rated Current:** Usually ranges between 300mA to 800mA (depends on specific manufacturer heat rise limits). * **Self-Resonant Frequency (SRF):** High, allowing the part to remain inductive at high frequencies. * **Operating Temperature:** Typically -40°C to +125°C. --- ### 3. Key Features and Materials * **Wire-wound Construction:** A copper wire is wound around a ceramic or ferrite core. This provides higher Q-factors (quality) and higher current handling compared to multilayer inductors. * **Ferrite Core:** Usually used to provide higher inductance in a smaller footprint and provide magnetic shielding to reduce EMI. * **SMD Design:** The "3225" (1210) footprint is optimized for automated pick-and-place assembly on PCBs. --- ### 4. Common Applications Due to its small size and high-frequency stability, this part is found in: 1. **RF Circuits:** Used in impedance matching and resonance circuits for telecommunications. 2. **EMI Filtering:** Suppressing high-frequency noise in power supply lines. 3. **Consumer Electronics:** Mobile phones, laptops, and tablets where board space is limited. 4. **Decoupling:** Isolating specific stages of a circuit to prevent interference. ---