The **M8CD-4446-R** is a specific surface-mount power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **M8CD series**, which is designed for high-current applications and efficient power conversion. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the M8CD-4446-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.6 µH (Typical) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~11.5 mΩ (Max) | | **Isat (Saturation Current)** | ~12.0 A | | **Irms (Rated Current)** | ~8.5 A | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Shielding** | Magnetically Shielded | --- ### 2. Key Internal Components & Materials * **Core Material:** This part typically utilizes a **Metal Powder Core** (Iron Powder/Composite). Unlike traditional ferrite, metal powder provides a soft saturation characteristic, preventing a sudden drop in inductance when the current spikes. * **Winding:** High-grade copper wire is wound around the core. The "CD" designation often refers to the specific drum-and-chase construction style used to optimize space. * **Terminations:** Matte tin over copper plating, ensuring high solderability for lead-free (RoHS compliant) assembly processes. * **Shielding:** The construction is magnetically shielded to minimize Electromagnetic Interference (EMI), which is critical in dense PCB layouts. --- ### 3. Functional Application The M8CD-4446-R is primarily used in **DC-DC Converters** and **Voltage Regulator Modules (VRMs)**. Its role is to store energy in the form of a magnetic field and smooth out the current ripples. **Common use cases include:** 1. **Computing:** Laptop and desktop motherboards for CPU/GPU power. 2. **Industrial:** Distributed power systems and DC-DC modules. 3. **Consumer Electronics:** High-efficiency power supplies for gaming consoles or smart home hubs. --- ### 4. Advantages * **Low DCR:** The low resistance minimizes heat dissipation (I²R losses), leading to higher overall system efficiency. * **High Power Density:** Large current handling capability within a relatively small footprint (approx. 8.3mm x 8.3mm). * **Stable Performance:** The composite core handles high-frequency switching with minimal core losses.