High-Efficiency Transmitter Coil For 10W Wireless Chargers


Vishay Intertechnology introduced a new wireless charging transmitter coil which offers a small size and high efficiency for Qi-compliant wireless charging pads. The IWTX-47R0BE-11 is suitable for use in WPC-compatible Tx (transmitter) circuits operating with 19 V input for up to 10W wireless charging applications.

The new transmitter coil IWTX-47R0BE-11 is A10 type, powdered-iron-based, WPC-compliant (Wireless Power Consortium) and AEC-Q200-qualified with a durable construction and high permeability shielding.

The coil is 18 per cent smaller than previous-generation solutions to save space in Qi wireless charging pads, while providing high efficiency greater than 80 per cent when paired with a Vishay Rx coil and appropriate Qi-compatible Rx and Tx circuitry, according to the company.


The product is designed for use in conjunction with Vishay’s WPC-compliant wireless receiver coils. The IWTX-47R0BE-11 features a high-saturation powdered iron which is not affected by permanent locating magnets. Offering a magnetic saturation of 50 per cent at 4000 gauss, the coil can serve as an alternative to larger ferrite-based solutions which can saturate in the presence of a strong magnetic field.

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

The IWTX-47R0BE-11 Tx coil is available in samples and production quantities.

Click here to view full Press release.

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