The **CM252016-R27M** is a surface-mount (SMD) wire-wound chip inductor commonly used in high-frequency circuits. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Part Number Deciphering Understanding the naming convention helps identify the physical and electrical properties: | Component Segment | Meaning | Details | | :--- | :--- | :--- | | **CM** | Series Code | Wire-wound Chip Inductor | | **252016** | Dimensions (LxWxH) | 2.5mm x 2.0mm x 1.6mm (Metric 2520 / Imperial 1008) | | **R27** | Inductance Value | R denotes decimal; 0.27 microhenries ($\mu H$) or 270nH | | **M** | Tolerance | ±20% | --- ### 2. Technical Specifications These parameters define the operational limits and performance of the inductor: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.27 $\mu H$ (270 nH) | | **Tolerance** | ±20% | | **Self-Resonant Frequency (SRF)** | ~425 MHz (Minimum) | | **DC Resistance (DCR)** | ~0.50 $\Omega$ (Maximum) | | **Rated Current ($I_{dc}$)** | ~450 mA | | **Quality Factor (Q)** | ~25 (at test frequency) | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Physical Construction The "CM" series typically utilizes a **Wire-Wound** construction on a ceramic or ferrite core. * **Core Material:** Usually alumina (ceramic) for high-frequency stability or ferrite if higher inductance is needed in the same footprint. * **Termination:** Features solderable end-caps (usually Tin-plated over Nickel) for standard reflow soldering processes. * **Encapsulation:** Often coated with an epoxy resin for mechanical protection and environmental resistance. --- ### 4. Key Applications Because of its small size and high SRF (Self-Resonant Frequency), this part is ideal for: * **RF Tuning:** Used in impedance matching and resonance circuits for wireless communication. * **Signal Filtering:** Used in high-pass or low-pass filters to remove noise from signals. * **DC/DC Converters:** Small power management modules requiring compact energy storage. * **EMI Suppression:** Reducing electromagnetic interference in mobile devices and peripherals. --- ### 5. Equivalent Replacement Guide If you are looking for an equivalent, ensure the following parameters match or exceed the original: 1. **Footprint:** 1008 (Imperial) / 2520 (Metric). 2. **Inductance:** 0.27 $\mu H$. 3. **Current Rating:** Must be equal to or higher than 450mA to prevent overheating. 4. **DCR:** Lower is generally better as it reduces power loss.