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  • Fair-Rite-Bridget
    Member
    Post count: 17

    The purpose of this topic is to provide an open forum to allow users of Fair-Rite’s products to share information, opinions, and experiences about Fair-Rite and our products and services.

    Bruce Sparrow
    Member
    Post count: 24

    I am using a ferrite bead in a MOSFET gate lead in a switching power supply to suppress noise reported in outputs (in the range of 1 – 10MHZ or higher ). I understand that material 31 or 43 is suitable for such application. But I have a size constraint for this ferrite bead. I need outer dia = 3mm; Inner dia = 1mm and length = 3mm. Small variations in size are acceptable. Please suggest a suitable part for the same.

    Bruce Sparrow
    Member
    Post count: 24

    MOSFET gate ringing can come from several sources but the only way to calm the stray inductance of the gate circuit, beyond just resistance, is with a ferrite. Fair-Rite 43 material a good choice for high frequency issues. A hole diameter of 1mm is the start – B dimension. Length is second – C dimension. This brings us to P/N 2643000501. If you find you need a little more impedance try our 2673000501 – it shifts the peak impedance to a lower frequency and supplies more impedance between 1 and 10MHz than the 43 material. Curves are available on the website for both.
    Good luck!
    Bill

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