Prem Magnetics stocks an extensive range of magnetic components for transformer and inductor construction, including bobbins, cores, frames, and laminations. Whether you are sourcing transformer components for a new design, replacing parts in an existing production run, or building prototypes from scratch, we can help you keep your project moving.
Following our acquisition of Formco assets, we have significantly expanded our magnetic components offering. We routinely supply coil components and inductor components to engineers, contract manufacturers, and production teams across a wide range of industries, from audio and communications to medical and industrial electronics.
Our large selection of in-stock material enables us to provide same day shipping of most bobbins and components and meet just-in-time manufacturing schedules. In addition, we provide custom transformer, inductor, and coil winding services to meet specific requirements.
Bobbins
Our bobbin inventory covers a wide range of coil bobbins and coil formers for transformer and inductor winding applications. We stock transformer bobbins, inductor bobbins, and coil winding bobbins in both through-hole and surface mount configurations, including EE, EI, UI, Pot Core, and Round bobbin styles. Whether you need magnetics bobbins for a standard lamination size or wire bobbins for a custom winding project, we have the stock to support prototyping and production quantities alike.
Cores
We supply a broad selection of magnetics cores for use in transformers, inductors, and chokes. Our range includes ferrite cores in common geometries as well as transformer cores and inductor cores sized to work with our bobbin inventory. Whether you are designing a high-frequency switching application that calls for ferrite core components or a lower-frequency power transformer requiring a laminated magnetic core, our team can help you identify the right part.
Frames
Magnetic frames are essential structural components in transformer assembly, providing support, alignment, and a secure platform for the finished unit. We stock a selection of metal frames suited to a range of standard transformer builds, with options to suit both standard and custom winding forms.
Laminations
Our laminations inventory includes transformer laminations in a range of standard sizes, including EI laminations and silicon steel laminations for use in power transformers and chokes. Transformer core laminations are available in standard sizes to suit a wide range of winding configurations.
Why Prem Magnetics
A Trusted Source for Magnetic Components
Prem Magnetics has been manufacturing and supplying electromagnetic components since 1972. Our inventory is backed by over 50 years of coil winding expertise, and most items are available for same-day shipping from our US facility.
- Large in-stock inventory: We maintain deep stock across bobbins, cores, frames, and laminations to support just-in-time manufacturing schedules and urgent prototype needs.
- No minimum order: We supply single units for engineering and prototyping as readily as large production quantities, with no minimum order charges.
- Same-day shipping: Most in-stock magnetic components ship the same day from Johnsburg, Illinois.
- US-based support: Our team is here to help you select the right components for your application; call or contact us directly.
- Custom coil winding: Need more than components? We offer full custom transformer, inductor, and coil winding services to complement your build.