FSC-BT3431 BLE 5.1 SIG Mesh Master & Slave Module (Low Power Consumption)

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FSC-BT3431 is a versatile Bluetooth module designed for seamless integration. With support for Bluetooth Low Energy (BLE) 5.1 and SIG mesh, this module offers unparalleled connectivity options. Equipped with user-friendly Feasycom firmware, it provides easy access to Bluetooth functionality through simple ASCII commands. Boasting impressive power efficiency, it ensures optimal power management with low power consumption in sleep mode. Featuring exceptional sensitivity and a programmable transmitter, it enables reliable and long-range communication. With precise clock synchronization and a wide range of applications, the FSC-BT3431 is ideal for Bluetooth keys, OBUs, smart homes, and more.


  1. Low power comparator
    • Radio receive current: 3.8 mA@3.3 V
    • Radio transmit current: 4.2 mA @0 dBm/3.3 V
    • Sleep mode (48 KB RAM retention): 1.4 μA@3 V
    • PD mode: 130 Na
  2. RF Specification:
    • RX sensitivity: -96 dBm @BLE 1 Mbps
    • RX sensitivity: -93 dBm @BLE 2 Mbps
    • Power of programmable transmitter: up to +6 dBm
    • Single end antenna
  3. Clock:
    • HSE: 32 MHz high speed external crystal
    • LSE: 32.768 KHz low speed external crystal
    • HSI: high speed internal RC 64 MHz


  • Bluetooth Key
  • OBU
  • Bluetooth Voice Remote Controller
  • Smart Home
  • Data Transmission Module


Product Model FSC-BT3431
Bluetooth Standard Bluetooth 5.1 (Bluetooth® Low Energy)
Frequency 2.402 ~ 2.480 GHz
Interface UART/I²S/I²C
Transmit Power +6 dBm (Max.)
Receiver Sensitivity -96 dBm (Min.) @ BLE 1Mbps
Dimension (mm) 12 × 15 × 1.7
Operating Temperature -40°C ~ +85°C
Storage Temperature -40°C ~ +85°C
Supply Voltage 1.8V/2.32V ~ 3.6V
Miscellaneous Lead-free and RoHS compliant, one year warranty
Humidity 10% ~ 90% (non-condensing)
MSL Grade MSL 3
ESD Grade Pass ±2000V for human body model, pass ±500V for charge device model
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