The **HAH1040-R15** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and voltage regulator modules (VRMs). It belongs to a class of "molded" inductors designed for high efficiency and compact footprints. --- ### 1. Key Technical Specifications | Parameter | Specification (Typical) | | :--- | :--- | | **Inductance** | 0.15 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.50 mΩ (Max) | | **Saturation Current (Isat)** | ~75A - 90A | | **Rated Current (Irms)** | ~40A - 55A | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | ~10.0 x 11.0 x 4.0 mm | --- ### 2. Core Features & Construction * **Composite Molded Construction:** The inductor is made by pressing a metal alloy powder around the copper coil. This creates a "soft saturation" characteristic, meaning the inductance doesn't drop off instantly when current increases. * **Low DCR:** Because it uses heavy-gauge flat wire or thick copper, the internal resistance is extremely low (measured in milliohms). This minimizes heat loss (I²R loss). * **Magnetic Shielding:** The molded body acts as a natural shield, reducing Electromagnetic Interference (EMI) that could affect nearby sensitive components. * **High Frequency Performance:** It is optimized for switching frequencies ranging from 100 kHz up to 5 MHz. --- ### 3. Common Applications This specific inductor (0.15 µH) is a very low inductance value, typically used in **Multi-phase Buck Converters** where high speed and high current are required: 1. **Graphics Cards (GPUs):** Powering high-end NVIDIA or AMD processors. 2. **Motherboards:** VRM (Voltage Regulator Module) stages for CPUs. 3. **Data Centers:** High-current power modules for servers. 4. **FPGA Power Supplies:** Providing stable, high-current low-voltage rails. --- ### 4. Part Number Breakdown (General Logic) | Segment | Meaning | | :--- | :--- | | **HAH** | Series identifier (High Current Inductor) | | **1040** | Physical Size (Approx. 10mm x 10mm x 4.0mm) | | **R15** | Inductance value (R denotes decimal: 0.15 µH) |