The **CMS1-14-R** is a high-performance, common-mode inductor (choke) manufactured by **Eaton (formerly Coiltronics)**. It is part of the CMS series, designed to provide excellent noise suppression in power electronics applications. --- ## 1. Technical Specifications The "1-14-R" suffix denotes specific physical size and winding configurations. Below are the primary technical parameters: | Parameter | Value/Detail | | :--- | :--- | | **Inductance** | ~14.1 µH (Typical) | | **Current Rating (Irms)** | ~5.8 Amperes | | **DCR (DC Resistance)** | ~11.0 mΩ (Max) | | **Footprint Size** | Size 1 (Approx. 9.4 x 9.4 x 4.0 mm) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Toroidal core with surface mount (SMT) base | --- ## 2. Core Features The CMS1-14-R is engineered for reliability and efficiency in electromagnetic interference (EMI) filtering: * **Common-Mode Noise Suppression:** Effectively filters out high-frequency noise that travels in the same direction on both power lines. * **Low Magnetic Flux Leakage:** The toroidal design ensures that the magnetic field is contained, reducing interference with neighboring components. * **Surface Mount Design:** Features a rugged header/base that allows for automated "pick and place" assembly on PCBs. * **RoHS Compliant:** The "-R" suffix indicates compliance with lead-free and environmental standards. --- ## 3. Applications and Usage This component is typically found in the input/output filter stages of power supplies. ### Common Use Cases: 1. **DC-DC Converters:** Filtering switching noise to prevent it from reaching the rest of the system. 2. **AC Adapters:** Reducing EMI to comply with regulatory standards (like FCC or CISPR). 3. **Industrial Electronics:** Protecting sensitive control logic from power line disturbances. 4. **Computer Peripherals:** Used in power rails for servers and high-end workstations. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in selecting alternatives: `CMS` | `1` | `14` | `-R` ---|---|---|--- **Series Name** | **Size Code** | **Inductance Code** | **RoHS Compliant** (Common Mode Sensor) | (Physical dimensions) | (Value in µH) | (Environmentally Friendly)