SMD Inductors

A chip inductor, also known as a surface-mount inductor (SMT inductor), is a passive electronic component that stores energy in its magnetic field when current flows through it. It is a type of inductor that is designed for surface-mount technology (SMT), which allows for automated assembly on printed circuit boards (PCBs).

Definition:
A chip inductor is a compact, high-frequency inductor that is typically made from a ferrite or ceramic core, with a coil of wire wrapped around it. The coil is then encapsulated in a small, often rectangular, package made of plastic or ceramic material. These inductors are valued for their small size, high inductance, and low self-resonant frequency, which makes them suitable for high-frequency applications.

Function:
The primary function of a chip inductor is to introduce inductance into an electrical circuit. Inductance is the property of a component that opposes changes in the current flowing through it, which is useful for filtering, tuning, and energy storage in various electronic circuits. Chip inductors are particularly important in applications where space is at a premium and high-frequency performance is required.

Applications:
Chip inductors are widely used in a variety of electronic devices and systems, including:
1. Mobile Phones and Tablets: For power management, signal filtering, and RF applications.
2. Computers and Servers: In power supplies and signal processing circuits.
3. Automotive Electronics: For engine control units, infotainment systems, and power management.
4. Medical Devices: In power supplies and signal conditioning circuits.
5. Telecommunications: In base stations and networking equipment for signal filtering and impedance matching.
6. Consumer Electronics: In power supplies and signal processing circuits of various devices.

Selection Criteria:
When choosing a chip inductor, several factors should be considered:
1. Inductance Value: The amount of inductance required for the specific application.
2. Current Rating: The maximum current the inductor can handle without overheating.
3. Self-Resonant Frequency (SRF): The frequency at which the inductor's inductive reactance equals its capacitive reactance, beyond which the inductor's performance may degrade.
4. Quality Factor (Q): A measure of the inductor's efficiency, with higher Q indicating less energy loss.
5. Size and Package: The physical dimensions and packaging type that fit the PCB layout and assembly process.
6. Temperature Range: The operating temperature range of the device.
7. Cost: The budgetary constraints of the project.

In summary, chip inductors are essential components in modern electronics, providing inductance in a compact form factor suitable for high-frequency applications. Their selection involves a balance of electrical performance, physical constraints, and cost considerations.
Please refer to the product rule book for details.