The **XFHCL4MA-R90M** is a high-performance surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to a category of shielded, high-current inductors designed for compact electronic assemblies. --- ### 1. Technical Specifications The following table highlights the core electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.90 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~5.0 mΩ (Typical) | | **Saturation Current (Isat)** | ~18.0 A to 22.0 A | | **Temperature Rise Current (Irms)** | ~14.0 A | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetic Shielded | | **Package Size** | Approx. 4.0 x 4.0 mm (4040 Series) | --- ### 2. Key Features * **Magnetic Shielding:** The part is constructed to minimize electromagnetic interference (EMI), which is critical for densely packed circuit boards where noise can affect nearby components. * **High Current Handling:** Despite its small footprint, the "R90M" (0.90µH) design allows for high saturation currents, meaning the inductance remains stable even under heavy electrical loads. * **Low DCR:** The low direct current resistance reduces power loss through heat, increasing the overall efficiency of the power supply. * **Composite Construction:** Usually features a metal alloy powder core that provides superior saturation characteristics compared to traditional ferrite cores. --- ### 3. Application Areas This component is primarily found in power management stages for: 1. **Consumer Electronics:** Laptops, tablets, and high-end smartphones. 2. **DC-DC Converters:** Buck, Boost, and Buck-Boost regulators. 3. **Graphic Cards (GPUs):** Voltage Regulator Modules (VRMs) requiring stable current flow. 4. **Embedded Systems:** Industrial PC motherboards and IoT gateways. --- ### 4. Part Number Breakdown (Naming Convention) While specific to the manufacturer (often associated with brands like XFMRS), the code generally breaks down as follows: * **XF:** Manufacturer Prefix. * **HCL:** Series identifier (High Current, Low Profile). * **4MA:** Physical dimensions/Case size (e.g., 4x4mm). * **R90:** Inductance value (R90 = 0.90 µH). * **M:** Tolerance code (M = ±20%).