FSC-BT836B RTL8761BTV Dual-Mode BT 5.3 Module for Multiple Masters & One Slave High-Speed Data Transmission (High Output Power and support MFi)


FSC-BT836B is a dual-mode Bluetooth 5.3 module, supporting profiles such as SPP, HID, GATT, and ATT. It features multiple hardware interfaces including UART, USB, PCM, I²C, AIO, and PIO, and integrates a high-performance MCU, Bluetooth controller, and chip antenna into a compact package, enabling integration into small products. Using UART for programming, users can configure the module via AT commands. Powered by Feasycom’s Bluetooth stack, it offers extensive application possibilities. For programming details, refer to the relevant user guide.


  • Fully qualified Bluetooth 5.3/4.2/4.0/3.0/2.1/2.0/1.2/1.1
  • Postage stamp sized form factor
  • Low power
  • Supports TX +10dBm maximum output power for Bluetooth BR/BLE
  • Supports TX +7.5dBm maximum output power for Bluetooth EDR
  • Receive sensitivity: -94 dBm (2Mbps EDR Minimum), -98 dBm (BLE Minimum)
  • The default UART Baud rate is 115.2 Kbps and can support from 1200 bps up to 921.6 Kbps
  • UART, I²C, USB hardware interfaces
  • Support the OTA upgrade
  • Embedded Bluetooth stack profiles support: SPP, HID, GATT, ATT, GAP
  • Support Apple MFi (iAP2), iBeacon
  • Power Consumption In Sleep Mode (VDD_3V3 at 3.3V)
    • Discoverable: 2.5 mA
    • BR/EDR Connection: 9.89 mA
    • LE Connection: 6.15 mA
  • Power Consumption In Working Mode (VDD_3V3 at 3.3V)
    • Discoverable: 21.75 mA
    • BR/EDR Connection: 24.92 mA
    • LE Connection: 20.79 mA
    • BR/EDR Connection @ 115200 bps: 25.11 mA


  • Smart Watch and Bluetooth Bracelet
  • Health & Medical devices
  • Wireless POS
  • Measurement and monitoring systems
  • Industrial sensors and controls
  • Asset tracking


Product Model FSC-BT836B
Chipset RTL8761BTV
Dimensions (mm) 13 × 26.9 × 2.4
Bluetooth Standard 5.3 (dual-mode)
Power Supply 3.3V DC
Output Power +4.5 dBm (default for all data rate)
+10 dBm (BR/BLE) (Max.)
+7.5 dBm (EDR) (Max.)
Sensitivity -94 dBm (2Mbps EDR) (Min.)
-98 dBm (BLE) (Min.)
Frequency Band 2.402 ~ 2.480 GHz ISM band
Modulation GFSK, π/4-DQPSK, 8-DPSK
Baseband Crystal OSC 40 MHz
Hopping & channels 1600 hops/sec, 1MHz channel space, 79 Channels (BT 5.x to 2MHz channel space)
RF Input Impedance 50 ohms
Antenna Integrated chip antenna
Interface Data: UART (Standard), I²C
Others: PIO, AIO, PWM, USB
Advanced Feature MFi, Airsync, iBeacon, OTA
Operating Temperature (Optional) 0ºC ~ +70 ºC
-20ºC ~ +85 ºC
Humidity 60% (Max)
Environmental RoHS Compliant
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