WHYTA0412 series Inductance Value 0.15-4.7uH DCR 9-195mΩ IRMS 1.8-7.5A ISAT 2.2-15A Integrated Molded inductor
WHYTA0412 series Inductance Value 0.15-4.7uH DCR 9-195mΩ IRMS 1.8-7.5A ISAT 2.2-15A Integrated Molded inductor
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A molded inductor (such as the WHYT/WHYTA/WHYTP series) is a power inductor made by embedding the coil in metal magnetic powder and compression-molding it into a single body. Compared with traditional assembled wire-wound inductors, it has an integrated structure and a closed magnetic path, offering small size, good magnetic shielding, low flux leakage, vibration resistance, and low noise - particularly suitable for high-density board-level power supply designs.
They are widely used as energy-storage and filter inductors in DC-DC buck/boost circuits, commonly found in CPU/GPU power delivery (VRM), servers, laptops, automotive electronics, and power modules - applications involving high current, high-frequency switching, and tight space constraints.
Molded inductors use metal powder cores with a distributed air gap, so the inductance decreases slowly and smoothly as current increases (soft saturation), whereas gapped ferrite inductors show a sharp inductance drop at the saturation point (hard saturation). Soft saturation means the inductance will not suddenly collapse during momentary overcurrent (such as load transients or startup inrush), keeping the current ripple under control and the system safer, and allowing parts to be selected closer to their saturation current.
They are limited by different mechanisms: Isat is defined by the inductance dropping to a certain percentage (e.g., a 30% decrease) and relates to ripple current and peak current safety; Irms is defined by temperature rise (typically 40 K) and relates to long-term heating and reliability. In the design, ensure the circuit's peak current is below Isat and the continuous operating current is below Irms, applying whichever constraint is stricter. For high-frequency applications, also consider the additional temperature rise caused by core loss increasing with frequency.
