Transmitter coil saves space in Qi-compatible charging pads

Article By : Vishay Intertechnology

Offering a durable construction and high permeability shielding, the new Vishay Dale IWTX-47R0BE-11 6.3µH is 18% smaller than other solutions on the market.

Vishay Intertechnology has launched a new powdered-iron-based, WPC-compatible (Wireless Power Consortium) wireless charging A11 type transmitter coil for 5V applications.

Offering a durable construction and high permeability shielding, the new Vishay Dale IWTX-47R0BE-11 6.3µH is 18% smaller than other solutions on the market to save space in Qi wireless charging pads, while providing high efficiency greater than 70% when paired with a Vishay Rx coil and appropriate Qi-compatible Rx and Tx circuitry. AEC-Q200 qualification is pending.

Designed for use in conjunction with Vishay’s WPC-compatible wireless receiver coils, the IWTX-47R0BE-11 6.3µH’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 6.3µH offers a magnetic saturation of 50% at 4,000 gauss.

__Figure 1:__ *The IWTX-47R0BE-11 6.3µH is designed for use in conjunction with Vishay’s WPC-compatible wireless receiver coils.*

The RoHS-compliant device features low inductance of 6.3µH at 200kHz with a +5% inductance tolerance, DCR of 38mΩ (± 10%) at + 25°C, and Q of 190 typical at 200kHz. The transmitter coil features a lead length of 47mm and tinned length of 5mm, and self-resonant frequency of 22MHz.

Samples and production quantities of the IWTX-47R0BE-11 6.3µH Tx coil are available now, with lead times of 14 weeks for large orders.