## Analysis of CDMC6D28NP-R20MB The **CDMC6D28NP-R20MB** is a high-performance, shielded surface-mount (SMD) power inductor manufactured by **Sumida**. It is specifically designed for high-current power supply applications where space and efficiency are critical. --- ### 1. Key Technical Specifications The following table breaks down the electrical and physical characteristics of this component: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.20 µH | | **Tolerance** | ±20% (indicated by 'M') | | **DC Resistance (DCR)** | 2.50 mΩ (Typical) / 3.00 mΩ (Max) | | **Saturation Current (Isat)** | ~22.0 Amperes | | **Temperature Rise Current (Irms)** | ~20.0 Amperes | | **Operating Temperature** | -40°C to +125°C (including self-heating) | | **Dimensions (L x W x H)** | 7.25 x 6.6 x 3.0 mm | | **Construction** | Metal Compound Molding (Shielded) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying the series features: - **CDMC**: Series name (Metal Compound Molded Inductor). - **6D28**: Physical size (approx. 6mm footprint, 2.8mm height). - **NP**: Packaging type (Standard Carrier Tape). - **R20**: Inductance value (R20 = 0.20 microhenries). - **M**: Tolerance (M = ±20%). - **B**: Specific internal code/revision. --- ### 3. Core Features and Benefits 1. **Metal Compound Structure**: Unlike traditional ferrite drum cores, this part uses a metal powder molding technology. This results in a **soft saturation** characteristic, meaning the inductance doesn't drop abruptly when current exceeds the limit. 2. **Magnetic Shielding**: The molded design inherently provides magnetic shielding, which minimizes Electromagnetic Interference (EMI) with surrounding components. 3. **Low DCR**: The extremely low DC resistance (2.5mΩ) ensures minimal power loss and high efficiency in high-current DC-DC converters. 4. **High Reliability**: The robust construction is resistant to mechanical shock and vibration, making it suitable for industrial environments. --- ### 4. Typical Applications * **Voltage Regulator Modules (VRMs)** for CPUs and GPUs. * **DC/DC Converters** in telecommunications and distributed power systems. * **High-current POL (Point of Load)** converters. * **Battery-powered devices** where high efficiency is required to extend battery life. ---