Through-Hole Inductors

Through Hole Inductors: Definition, Function, Applications, and Selection Criteria

Definition:
Through Hole Inductors (THI) are passive electronic components designed to store energy in a magnetic field when an electric current flows through them. They are characterized by having leads that pass through holes in a printed circuit board (PCB) for mounting and electrical connection.

Function:
The primary function of a through hole inductor is to provide inductance, which is the property of a component that opposes changes in current flow. This opposition is due to the magnetic field created by the current. Inductors are used to filter signals, block high-frequency noise, and provide energy storage in various electronic circuits.

Applications:
1. Signal Filtering: Inductors are used in filters to block or pass specific frequency ranges, helping to clean up signals in communication systems.
2. Power Supplies: They are integral in smoothing the output of power supplies, reducing noise and voltage.
3. RF Applications: In radio frequency (RF) circuits, inductors are used for impedance matching, tuning circuits, and signal coupling.
4. EMI/RFI Suppression: They help to suppress electromagnetic interference (EMI) and radio frequency interference (RFI) in sensitive electronic devices.
5. Energy Storage: In energy storage applications, inductors can temporarily store energy in the form of a magnetic field.

Selection Criteria:
1. Inductance Value: The inductance value (measured in henries) is critical and must be chosen based on the specific requirements of the circuit.
2. Current Rating: The inductor must be able to handle the current levels expected in the application without overheating or saturating.
3. Frequency Range: The operating frequency of the circuit will influence the choice of inductor, as different inductors have different performance characteristics at various frequencies.
4. Physical Size: The size of the inductor should be compatible with the available space on the PCB.
5. Temperature Stability: For applications with varying temperatures, inductors with stable inductance over a wide temperature range are preferred.
6. Quality Factor (Q): A higher Q factor indicates better energy storage efficiency and less energy loss in the form of heat.
7. Cost: The cost of the inductor should be considered in relation to the performance and reliability required for the application.

Through hole inductors are a versatile component in the design of electronic circuits, and their selection should be based on a careful consideration of the above criteria to ensure optimal performance.
Please refer to the product rule book for details.