PoOnHand will send your inquiry to all specialized distributors.
Bluetooth v4.1 (BLE) SMART SOC 2Mbps 3V Medical 48-Pin QFN EP T/R
Descriptions of Nordic Semiconductor NRF51422-QFAB-R7 provided by its distributors.
ANT SoC 48-pin 6x6mm QFN w/128K flash
Symmetry Electronics