The **104CDMCCDS-R15MC** is a high-performance, surface-mount (SMD) power inductor typically manufactured by **Sumida**. It belongs to the CDMC series, which is characterized by its metal composite core construction designed for high-current power applications. --- ### 1. Technical Specifications The alphanumeric code represents specific physical and electrical characteristics. Below is a breakdown of the key parameters: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.15 µH (Microhenries) | | **Tolerance** | ±20% (indicated by 'M') | | **Case Size** | 104 (Approx. 11.5 x 10.4 x 4.0 mm) | | **DCR (DC Resistance)** | Very Low (typically < 1.0 mΩ) | | **Saturation Current (Isat)** | High (typically 50A - 70A range) | | **Core Material** | Metal Composite (Iron powder based) | | **Operating Temp** | -55°C to +125°C (includes self-heating) | --- ### 2. Key Features * **Metal Composite Core:** Unlike traditional ferrite inductors, these use a metal powder core. This allows for a **soft saturation** characteristic, meaning the inductance drops gradually as current increases rather than dropping abruptly. * **Low Profile:** The "104" series is designed to be relatively flat (approx. 4mm height), making it suitable for compact electronic assemblies. * **Shielded Construction:** The molded metal body acts as a natural magnetic shield, significantly reducing Electromagnetic Interference (EMI). * **High Efficiency:** Due to the extremely low DC resistance (DCR), energy loss through heat is minimized. --- ### 3. Common Applications This specific part is used in circuits where high current must be regulated quickly and efficiently: 1. **Voltage Regulator Modules (VRMs):** Found on motherboards and server cards to power CPUs and GPUs. 2. **DC-DC Converters:** Used in point-of-load (POL) power supplies. 3. **Battery Powered Systems:** Ideal for high-efficiency mobile or automotive electronics. 4. **Distributed Power Systems:** Used to stabilize power rails in telecommunications equipment. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **104** | Dimensions (approx. 10mm x 10mm footprint) | | **CDMC** | Series name (Metal Composite Type) | | **DS** | Specific internal design/material variation | | **R15** | Inductance value (R15 = 0.15 µH) | | **M** | Tolerance (M = ±20%) | | **C** | Packaging / Specific manufacturing code |