The **CDBH8D38NP-R56MC** is a surface-mount (SMD) power inductor manufactured by **Sumida**. It is part of the CDBH8D38 series, known for high current capacity and magnetic shielding. --- ## 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **CDBH** | Series Name | High Current SMD Power Inductor | | **8D38** | Dimensions | Approx. 8.3 x 8.3 mm (Width/Length) x 4.0 mm (Height) | | **NP** | Packaging | Standard Carrier Tape & Reel | | **R56** | Inductance Value | **0.56 µH** (R denotes decimal point) | | **M** | Tolerance | **±20%** | | **C** | Special Code | Internal manufacturing/revision code | --- ## 2. Key Technical Specifications Based on the standard datasheet for this specific R56 (0.56 µH) variant: ### Electrical Properties * **Inductance:** 0.56 µH * **DC Resistance (DCR):** Extremely low (typically in the range of 5–8 mΩ) to minimize power loss. * **Saturation Current ($I_{sat}$):** High current capability, typically exceeding **15A - 20A** (the point where inductance drops by 30%). * **Temperature Rise Current ($I_{rms}$):** The current that causes a 40°C temperature rise, usually rated very high due to the thick wire gauge. ### Physical & Environmental * **Shielding:** Ferrite core construction provides magnetic shielding to reduce Electromagnetic Interference (EMI). * **Operating Temperature:** Generally **-40°C to +125°C** (including self-heating). * **Footprint:** Square-shaped base for stable PCB mounting. --- ## 3. Typical Applications Because this part offers low inductance but very high current handling, it is typically used in: * **DC/DC Converters:** High-frequency switching regulators. * **CPU/GPU Power Supplies:** Used in "Voltage Regulator Modules" (VRMs) for servers and high-end PCs. * **Battery Powered Devices:** Where efficiency is critical to prolong battery life. * **Distributed Power Systems:** Handling high-current point-of-load (POL) requirements. --- ## 4. Design Considerations * **Saturation:** Ensure your peak circuit current does not exceed the $I_{sat}$ rating, or the inductor will lose its effectiveness and cause circuit instability. * **Thermal Management:** Even with low DCR, high-current flow generates heat. Ensure adequate PCB copper traces for heat dissipation. * **EMI:** While shielded, the orientation of the inductor can still affect nearby sensitive analog traces.