Toroidal Inductors

Headquartered in Gardena, Calif., MPS Industries is a leading provider of electronic components, such as custom inductors, transformers, common mode chokes, power supplies, and current sensors. We serve the medical, aerospace, telecommunications, defense, and other industries with high-quality custom solutions. Our expansive product line includes toroidal inductors suitable for diverse applications. 

What Is a Toroid Inductor?

The key purpose of a toroid inductor is to attain energy efficiency when low frequencies require inductance. This is achieved by using an insulated coil wire wound around in a ring-shaped magnetic form. Considered passive electronic components, toroid inductors are used when large inductances are needed.

In the past, most closed-cored inductors had a square shape. The toroidal shape has since emerged as the preferred option given its superior electrical performance. The symmetrical shape of toroidal cores minimizes the amount of leakage flux, the magnetic flux that escapes outside the core. This benefit means that the inductance of a toroid is less likely to cause electromagnetic interference than its square-shaped predecessor. 

Toroidal inductors are used in various electronic circuits, including amplifiers, inverters, and power supplies. Most electronic equipment uses a toroidal inductor, so there is a range of toroid inductor types available on the market. 

Types of Toroid Inductors

Generally, toroid inductors are identified by specific performance types, such as DC resistance or nominal inductance. Toroid inductors are also classified by size, current rating, tolerance, and packaging type. 

Common types of toroid inductors include:

  • Standard Toroidal Inductor
  • Low Loss Toroidal Inductor
  • High-Temperature Toroidal Inductor
  • High Current Toroidal Inductor
  • Current Sensing Inductor
  • Vertical Toroidal Inductor
  • Horizontal Toroidal Inductor
  • Coupled Inductor
  • Surface Mount Toroidal Inductor
  • Thru Hole Toroidal Inductor

When you order a toroidal inductor, it can be used as an SMT inductor, common mode inductor, toroidal coil, or any other application requiring toroidal coils.

Applications for Toroid Inductors

Toroid coils are best for electronic devices using electricity with low frequencies. Given that toroid inductors act as inductors, they increase electrical frequencies to optimal levels. Although toroids are more difficult to wind than solenoids, toroid inductance is more efficient and economical than its solenoid counterpart. Toroid applications are diverse and include:

  • Medical devices (in hospitals and residences) 
  • Telecommunications
  • Aerospace
  • Nuclear energy
  • Industrial controls
  • Ballasts
  • Refrigeration equipment
  • Musical instruments
  • Electronic brakes
  • Electronic clutches
  • EMI filter
  • HVAC equipment
  • Amplifiers
  • Triac control circuits
  • Power supplies
  • Switching regulators

Choosing the Right Toroid Inductor

Choosing the right toroid inductor is mainly based on three variables: tolerance, current rating, and nominal inductance. These should be used as guides when searching for or developing your own toroid inductor. Next, consider core material, size, and shape. Toroid cores are available in a variety of materials, which can be optimized for specific applications based on the inductor usage, cost, availability, and other considerations.

In most cases, a toroid inductor can be used in place of any inductor, given the round shape is compatible with the overall design. Round cross sections provide better performance than rectangular models. Toroid inductors can usually be positioned in vertical or horizontal mount orientations for low profile or board space requirements. 

Choose MPS Industries for Your Toroid Inductor Needs

Toroidal inductors are crucial components in electronic devices. At MPS Industries, we understand that electronic components must be reliable for devices to do their job. When needed, our engineering team can help design a custom toroid inductor for your project. 

Browse our selection of toroidal inductors, or, if you’re ready to place an order, request a quote today. 

MPS Industries, Inc.

19210 S. Vermont Avenue, Building D-415

Gardena, CA 90248

Phone: 310.325.1043