The **AHC30-R39M-RC** is a high-current, surface-mount (SMD) power inductor typically used in DC-DC converters and voltage regulator modules. It is part of a class of "molded" inductors known for their durability and EMI shielding. --- ### 1. Part Number Breakdown Based on industry-standard nomenclature for this series, here is what the alphanumeric code represents: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **AHC** | Series Code | High-current power inductor series. | | **30** | Physical Size | Typically refers to height or a specific footprint (e.g., 3.0mm height). | | **R39** | Inductance Value | **0.39 µH** (R acts as the decimal point). | | **M** | Tolerance | **±20%** (Standard for power inductors). | | **RC** | Compliance | **RoHS Compliant**. | --- ### 2. Key Specifications While exact values can vary slightly by manufacturer (such as Allied Components or similar), the general specifications for an **R39M** in this frame size are: * **Inductance:** 0.39 µH * **DC Resistance (DCR):** Very low (typically < 2.0 mΩ), which minimizes power loss. * **Saturation Current ($I_{sat}$):** High (often between 20A to 35A), meaning the part maintains inductance even under high loads. * **Temperature Range:** -40°C to +125°C (includes self-heating). * **Core Material:** Carbonyl Iron or Metal Alloy powder (molded construction). --- ### 3. Core Features & Benefits * **Shielded Construction:** The molded design naturally shields the magnetic field, reducing Electromagnetic Interference (EMI) with surrounding components. * **High Efficiency:** The use of flat wire or specialized alloy powder allows for extremely low DCR, reducing heat generation. * **Soft Saturation:** Unlike ferrite cores that "drop off" abruptly, these inductors lose inductance gradually as current increases, making them safer for power spikes. --- ### 4. Common Applications These inductors are found in high-performance power circuits: 1. **Motherboards & Servers:** CPU/GPU voltage regulator modules (VRM). 2. **Point of Load (POL) Converters:** Step-down (Buck) converters for high-speed FPGAs. 3. **Battery Powered Devices:** High-efficiency power management for portable electronics. ---