• 1.

    Operating Temp. Range: The combination of ambient temperature and temperature rise.

  • 2.

    Inductance: Tested at 100kHz, 1 VRMS, Series.

  • 3.

    ISAT: DC current through the winding to cause a 25% (typ) drop in inductance.

  • 4.

    IDC: DC current through the winding to cause a 40°C (typ) temperature rise at 25°C ambient.

  • 5.

    Flammability Standard: Meets UL 94V-0.

  • 6.

    SRF: Values are for reference only.

  • 7.

    Packaging

    • Pieces/Tray: 40
    • Trays/Box: 4
    • Pieces/Box: 160
  • 8.

    Specifications subject to change without prior notice.

Frequently Asked Questions (FAQs)

What inductance values does the 1D31A Series offer?

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The series includes 10 µH, 12 µH, 15 µH, 18 µH, and 22 µH options (±20%). Selecting a higher value improves ripple attenuation, while lower values provide faster transient response.

What are the typical current and saturation levels?

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Depending on the variant, saturation currents range from ~31 – 50 A, with continuous current ratings around 12 A for a 40 °C rise. This fits audio filtering and moderate DC rails.

What does the SRF range (10–19 MHz) indicate for real use?

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The reference SRF range defines where parasitic capacitance begins to dominate. Since SRF is far above audio and low-frequency supply ranges, 1D31A behaves predictably within intended operating frequencies.

Why choose a shielded inductor for audio applications?

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Shielding reduces magnetic leakage, preventing noise coupling into nearby analog or digital circuits — essential for maintaining audio fidelity and EMI compliance.

Is the 1D31A suitable for high-frequency switching converters?

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No — its inductance range and core material are optimized for low-frequency filtering, not MHz-speed switching.

What are key layout considerations?

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Use wide copper traces, support thermal dissipation, minimize loop area, and ensure adequate solder anchoring due to the component’s size.

How does low DCR improve system performance?

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Low DCR minimizes conduction losses, improving efficiency and maintaining lower temperatures under sustained load.

What mechanical benefits does the large THT package offer?

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Strong mechanical anchoring and vibration resistance — ideal for large audio amplifiers, industrial equipment, and power modules.

What non-audio applications can 1D31A support?

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Low-frequency filtering in embedded systems, industrial controls, DC rail smoothing, and analog or mixed-signal electronics.

What parameters should engineers evaluate before selecting a model?

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Inductance, DCR, SRF margin, saturation current, thermal limits, footprint constraints, and ripple-current behavior.