Ferrite Inductor Calculator

| Added in Physics

What are Ferrite Inductors and Why Should You Care?

Ferrite inductors are components with ferrite cores known for strong electromagnetic properties and low electrical conductivity. They are widely used in RF circuits, power supplies, and signal processing applications.

Understanding ferrite inductors helps electronics enthusiasts and professionals design more efficient circuits and boost efficiency.

The Formula

$$L = \frac{\text{AL}}{\left(\frac{100}{N}\right)^2}$$

Where:

  • L is the inductance in henries (H)
  • AL Value is a core-specific constant from the manufacturer
  • Number of Turns is the number of coil loops around the core

Calculation Example

With an AL value of 75 and 45 turns:

First, calculate the inner part:

$$\frac{100}{45} = 2.2222$$

Square the result:

$$2.2222^2 = 4.938$$

Divide the AL value by this:

$$L = \frac{75}{4.938} \approx 15.19 \text{ H}$$

The ferrite inductor has an inductance of approximately 15.19 henries.

Benefits of Ferrite Core Inductors

  • High permeability - Increases inductance for given turns
  • Low eddy current losses - Efficient at high frequencies
  • Compact size - Achieve high inductance in small packages
  • Temperature stability - Consistent performance across temperature ranges

Frequently Asked Questions

A ferrite inductor uses a ferrite core known for strong electromagnetic properties and low electrical conductivity, common in electronics.

The AL value is a manufacturer-provided constant that measures inductance per turn squared of the core.

Inductance equals AL value divided by the square of 100 divided by the number of turns.

Ferrite cores offer high permeability and low eddy current losses, making them ideal for RF circuits and power supplies.