Image courtesy of Vishay Intertechnology

(Image courtesy of Vishay Intertechnology).

Wireless Charging Transmitter Coil for Qi Wireless Charging Pads

Vishay Intertechnology has introduced a new AEC-Q200-qualified, powdered-iron-based, WPC-compliant (Wireless Power Consortium) wireless charging A10 type transmitter coil.

Offering a durable construction and high permeability shielding, the new Vishay Dale IWTX-47R0BE-11 is 18 % smaller than previous-generation solutions to save space in Qi wireless charging pads, while providing high efficiency greater than 80 % when paired with a Vishay Rx coil and appropriate Qi-compatible Rx and Tx circuitry. The IWTX-47R0BE-11 is suitable for use in WPC-compatible Tx circuits operating with 19 V input for up to 10 W wireless charging applications.

Designed for use in conjunction with Vishay's WPC-compliant wireless receiver coils, the IWTX-47R0BE-11's high-saturation powdered iron is not affected by permanent locating magnets. As an alternative to larger ferrite-based solutions - which can saturate in the presence of a strong magnetic field - the IWTX-47R0BE-11 offers a magnetic saturation of 50 % at 4,000 gauss.

The RoHS-compliant device features inductance of 24 µH at 200 kHz with a +5 % / -10 % inductance tolerance, DCR of 71 mW (± 10 %) at + 25 °C, and Q of 200 typical at 200 kHz. The transmitter coil features a lead length of 40 mm and tinned length of 5 mm, and self-resonant frequency of 7 MHz.

Samples and production quantities of the IWTX-47R0BE-11 Tx coil are available now, with lead times of 14 weeks for large orders. Pricing for U.S. delivery only is $3.75 per piece in 1,000-piece quantities. 

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