Wireless charging coil yields 70% efficiency

The IWAS-4832FE-50 powdered-iron-based wireless charging receiving coil is designed is for 10 W applications. It is said to offer coupling efficiency greater than 70%.  

The RoHS-compliant device has 15 µH inductance at 200 kHz, ± 5 %, a DCR of 255 mΩ at 25°C, and a Q of 60 minimum at 200 kHz. Its high saturation powdered iron is not affected by permanent locating magnets. The 1.89 x 1.26 x 0.05 inch device costs $1.50 ea/10,000.