SD43-822MLC SD43-822 Inductor (8.2 uH)

SD43-822MLC is a high-quality unshielded surface mount device (SMD) power inductor manufactured by Coilcraft, a renowned leader in inductor technology. This specific component, with an inductance of 8.2 microhenries (uH), is designed to efficiently store energy in a magnetic field and release it, making it crucial for various power conversion and filtering applications. As a passive component, it plays a vital role in regulating current flow, smoothing power supplies, and filtering unwanted noise in electronic circuits. Its compact form factor and robust construction make it suitable for integration into modern, space-constrained designs.

Key Specifications

The SD43-822MLC inductor boasts several critical specifications that define its performance and suitability for different applications. The ‘Series’ designation, SD43-822, identifies it within Coilcraft’s product line, indicating its general characteristics and family. The ‘DCR Max’ (DC Resistance Maximum) of 132 mOhm and ‘DCR Typ’ (DC Resistance Typical) of 118.8 mOhm are crucial metrics, representing the resistance of the inductor’s winding. Lower DCR values are generally desirable as they minimize power loss and heat generation, enhancing efficiency. Being ‘Unshielded’ means it does not have a magnetic shield around its core, which can lead to a more compact design but requires careful PCB layout to prevent electromagnetic interference (EMI) with adjacent components. The primary ‘Inductance’ of 8.2 uH, with a ‘Tolerance’ of ±20%, dictates its energy storage capacity and impedance characteristics at various frequencies. The ‘Core Material’ is Ferrite, a common choice for power inductors due to its high magnetic permeability and ability to handle significant current without saturating. Its ‘Mounting Type’ is Surface Mount, facilitating automated assembly processes. The ‘Size / Dimension’ of 4.7 x 4.2 x 3.45 mm highlights its compact footprint, essential for miniaturized electronics. The ‘Current – Peak (Ipk)’ of 2.2 A, ‘Current – RMS (Irms)’ of 2.2 A, and ‘Current – Saturation (Isat)’ of 2.2 A are critical current ratings. Ipk refers to the maximum instantaneous current, Irms is the effective continuous current, and Isat is the current at which the inductance drops by a specified percentage (typically 20-30%), indicating the point where the core begins to saturate. The ‘Operating Temperature’ of up to 125 °C ensures reliable performance across a wide range of environmental conditions, while the ‘AEC-Q200 Qualified’ status being ‘No’ indicates it is not specifically designed for automotive applications, though it may still be suitable for many industrial and commercial uses.

Features and Benefits

• Optimized Inductance: The 8.2 uH inductance with ±20% tolerance provides reliable energy storage and filtering capabilities for various power circuits.
• Low DC Resistance: With a typical DCR of 118.8 mOhm, the inductor minimizes power losses, contributing to higher efficiency in power conversion applications and reduced heat generation.
• Compact SMD Footprint: The 4.7 x 4.2 x 3.45 mm dimensions enable space-saving designs, crucial for modern portable and miniaturized electronic devices.
• High Current Handling: Rated for 2.2 A peak, RMS, and saturation currents, it can support demanding power applications without premature saturation or overheating.
• Wide Operating Temperature Range: Capable of operating up to 125 °C, ensuring stable performance in diverse and challenging thermal environments.
• Ferrite Core Material: Utilizes a ferrite core for efficient magnetic energy storage and good performance across a range of frequencies.

Typical Applications

The SD43-822MLC inductor is a versatile component suitable for a broad spectrum of electronic applications requiring efficient power management and filtering. One primary application is in DC-DC converters, particularly in buck, boost, and buck-boost topologies, where it stores and releases energy to regulate output voltage levels efficiently. This is crucial for powering microcontrollers, sensors, and other digital circuits from a varied input supply. Another significant use case is in power supply filtering, where it helps to smooth out ripple currents and suppress noise, ensuring a clean and stable power output for sensitive electronics. This is vital in consumer electronics, industrial control systems, and communication equipment. Furthermore, it finds application in LED lighting drivers, where it contributes to current regulation and power factor correction, enhancing the efficiency and lifespan of LED luminaires. Its ability to handle current and maintain inductance stability makes it ideal for these demanding power circuits. It is also well-suited for portable electronic devices such as smartphones, tablets, and wearable technology, where its compact size and efficient power handling are paramount for extending battery life and enabling sleek designs. Lastly, it can be employed in various general-purpose filtering and energy storage circuits in industrial equipment, medical devices, and telecommunications infrastructure, where reliable passive components are essential for system stability and performance. In summary, the SD43-822MLC from Coilcraft is a robust and efficient unshielded SMD power inductor, offering excellent performance for a wide array of power management and filtering applications. Its compact size, low DCR, and high current ratings make it an ideal choice for modern electronic designs. This component is readily stocked and shipped across India by Cirkit Electro Components, Mumbai, ensuring prompt availability for your projects.

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