The **SC4020FH-R35** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and power management modules. It is part of the SC4020FH series, characterized by its low profile and high efficiency. --- ### 1. Key Technical Specifications The following table outlines the primary electrical and physical characteristics of the R35 variant: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.35 µH (Microhenries) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.90 mΩ (Typical) | | **Saturation Current (Isat)** | ~35.0 A to 40.0 A | | **Heating Current (Irms)** | ~25.0 A | | **Dimensions (L x W x H)** | 4.0 x 4.0 x 2.0 mm | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Construction * **Core Material:** Usually features a metal alloy powder core. This provides "soft saturation" characteristics, meaning the inductance drops gradually rather than abruptly as current increases. * **Shielding:** It is a **shielded inductor**, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Terminals:** Flat-bottom leadframe construction for robust soldering and high vibration resistance. --- ### 3. Functional Role in Circuits The SC4020FH-R35 serves several critical roles in electronic assemblies: 1. **Energy Storage:** In Buck (step-down) or Boost (step-up) converters, it stores energy in a magnetic field during the switching cycle. 2. **Filtering:** It works alongside capacitors to smooth out ripple current, providing a steady DC voltage to sensitive components like CPUs or GPUs. 3. **High-Current Handling:** Due to its very low DCR (0.90 mΩ), it minimizes power loss as heat, making it ideal for high-efficiency power supplies. --- ### 4. Typical Applications * **Computing:** Voltage Regulator Modules (VRM) for laptops and servers. * **Telecommunications:** Distributed power systems and base stations. * **Consumer Electronics:** High-end tablets, SSDs, and gaming consoles where space is limited but current demand is high.