FSC-BT821AN Realtek RTL8761 Dual-Mode Bluetooth 4.2 Module


The Feasycom FSC-BT821AN is a fully integrated Bluetooth module that complies with Bluetooth 4.2 dual mode protocols (BR/EDR/BLE). It supports SPP, BLE, ANCS, iBeacon profiles. It integrates baseband controller in a small package (external RF antenna is required), so the designers can have better flexibilities for the product shapes. FSC-BT821AN can be communicated by UART port. With Feasycom's Bluetooth stack, customers can easily transplant to their software.


  • Fully qualified Bluetooth 4.2/4.0/3.0/2.1/2.0/1.2/1.1
  • Postage stamp sized form factor
  • Low power consumption
  • Class 1.5 support (high output power)
  • The default UART Baud rate is 115.2 Kbps and can support from 1200 bps up to 921.6 Kbps
  • Supports UART, I2C, and PCM data connection interfaces
  • Bluetooth stack profiles support SPP, HID, HFP/HSP, A2DP, AVRCP, MAP, and all BLE protocols


  • Smart watch and Bluetooth bracelet
  • Health & medical devices
  • Wireless POS
  • Measurement and monitoring systems
  • Industrial sensors and controls
  • Asset tracking


Bluetooth Module FSC-BT821AN
Chipset Realtek RTL8761
Bluetooth Standard Dual-mode Bluetooth 4.2
Frequency Band 2.402~2.480GHz ISM band
Transmit Output Power +5.5 dBm (Max.) Class 1.5
Receive Sensitivity -82 dBm @ 0.1% BER
Profiles SPP, GATT (BLE standard), HID, HFP/HSP, A2DP, AVRCP, MFi, Airsync, iBeacon, MAP (optional)
Interfaces UART, I2C, PCM
Size (mm) 12 × 15 × 2
Power Supply 3.3V DC
Operating Temperature -20℃ to 70℃
Storage Temperature -40℃ to +85℃

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