The **FDV0840-R26M** is a high-performance, fixed power inductor manufactured by **Murata Electronics** (originally part of the TOKO line). It is specifically designed for high-current applications where efficiency and space are critical. --- ## 1. Technical Specifications The following table highlights the core electrical and physical parameters: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.26 µH | | **Tolerance** | ±20% | | **Current Rating (Isat)** | ~25.4 Amps (based on inductance drop) | | **Current Rating (Itemp)** | ~21.7 Amps (based on temperature rise) | | **DC Resistance (DCR)** | 1.1 mΩ (typical) | | **Operating Temp** | -40°C to +125°C | | **Dimensions (L x W x H)** | 8.4mm x 8.0mm x 4.0mm | | **Shielding** | Magnetically Shielded | --- ## 2. Key Features * **Metal Alloy Core:** Unlike traditional ferrite cores, this inductor uses a metal alloy powder. This allows for a **"Soft Saturation"** characteristic, meaning the inductance drops gradually as current increases rather than dropping off sharply. * **Low DCR:** With a typical resistance of only 1.1 mΩ, it minimizes power loss due to heat (I²R loss), making it highly efficient for high-speed switching. * **Magnetic Shielding:** The construction minimizes Electromagnetic Interference (EMI), which is vital for densely packed circuit boards. * **Compact Footprint:** The 0840 series designation refers to its roughly 8x8mm size with a 4mm height profile. --- ## 3. Applications The FDV0840-R26M is primarily used in **DC-to-DC converters** and voltage regulator modules (VRMs). Common use cases include: * **CPU/GPU Power Supplies:** Providing stable, high-current power to processors. * **Servers and Data Centers:** High-efficiency power distribution. * **Industrial Electronics:** Robust performance in varying temperature environments. * **FPGA Power Rails:** Supporting high-speed logic with low-noise power. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **FDV:** Series name (Metal Alloy type). * **0840:** Dimensions (8.4mm x 8.0mm x 4.0mm). * **R26:** Inductance value (R represents the decimal point = 0.26 µH). * **M:** Tolerance (M = ±20%).