The **MA0420-R68M1** is a high-performance, surface-mount (SMD) power inductor. These components are essential in modern electronics for energy storage and noise filtering, particularly in compact power supply circuits. ### Technical Specifications Below are the typical parameters for this specific part number: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.68 µH (Microhenries) | | **Tolerance** | ±20% (indicated by 'M') | | **Package Size** | 0420 (approx. 4.0 x 4.0 x 2.0 mm) | | **Material** | Metal Alloy / Carbonyl Powder | | **Shielding** | Magnetically Shielded | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### Part Number Breakdown The nomenclature follows a standard industry format: * **MA**: Series prefix (usually indicating Metal Alloy material for high current). * **0420**: Physical dimensions (Length 4.0mm, Width 4.0mm, Height 2.0mm). * **R68**: Inductance value. The 'R' acts as a decimal point ($0.68$). * **M**: Tolerance code ($M = \pm 20\%$). * **1**: Revision or packaging code. --- ### Key Features & Internal Composition 1. **Metal Alloy Core**: Unlike traditional ferrite inductors, the MA series uses a pressed metal powder core. This provides a "soft saturation" characteristic, meaning the inductance doesn't drop off instantly when high current is applied. 2. **High Current Handling**: Due to the metal body, it can handle significant DC current relative to its small size, making it ideal for DC-DC converters. 3. **Low DCR (DC Resistance)**: Designed with thick copper wire to minimize energy loss as heat. 4. **Shielded Design**: The molded construction acts as a magnetic shield, reducing Electromagnetic Interference (EMI) with nearby components. ### Common Applications * **Voltage Regulator Modules (VRM)**: Used in laptops and desktops to step down voltage for CPUs. * **DC-DC Converters**: Found in battery-powered devices (smartphones, tablets). * **LED Drivers**: Managing current flow for high-brightness LEDs. * **Automotive Electronics**: Powering infotainment systems or sensors. --- ### Equivalent Circuits In a schematic, this part is represented by an inductor symbol ($L$). It is typically used in a Buck Converter circuit: ```text [Input Vin] --- [Switch/MOSFET] --- [MA0420-R68M1] --- [Output Vout] | [Capacitor] | [GND] ```