The **SCEP134S-R40** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-current power supplies. It is manufactured by **Sumida Corporation**. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the SCEP134S-R40: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.40 µH (± 20%) | | **DCR (Direct Current Resistance)** | 1.10 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | ~30.0 A (at 25°C) | | **Temperature Rise Current ($I_{rms}$)** | ~22.0 A | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (LxWxH)** | 13.9 x 13.9 x 4.8 mm | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Key Features * **High Current Capability:** Designed to handle significant current flow without saturating, thanks to its robust magnetic core. * **Low DCR:** The very low DC resistance (1.10 mΩ) minimizes power loss as heat, increasing the overall efficiency of the power circuit. * **Magnetic Shielding:** The "S" in the series usually denotes a shielded construction, which reduces Electromagnetic Interference (EMI) with surrounding components. * **Flat Wire Technology:** Often utilizes flat copper wire to maximize the winding area and reduce high-frequency skin effect losses. --- ### 3. Application Areas This specific inductor is typically found in environments requiring stable power delivery under heavy loads: 1. **Voltage Regulator Modules (VRMs):** Used in CPU and GPU power delivery on motherboards. 2. **DC/DC Converters:** Found in point-of-load (POL) converters for telecommunications and industrial equipment. 3. **Battery Powered Systems:** Ideal for high-efficiency mobile power management. 4. **Servers and Networking:** Used in high-speed data processing hardware. --- ### 4. Part Number Breakdown The part number can be decoded as follows: * **SCEP:** Series name (Shielded, High Current Inductor). * **134S:** Size code (approx. 13mm square by 4mm height). * **R40:** Inductance value ($R40 = 0.40 \mu H$).