Deeply cultivated in the industry for more than ten years, cumulatively serving more than 10W+ customers, WiFi modules, Bluetooth modules, power modules and other products are exported to more than 80 countries and regions, providing customers with professional and reliable IoT module products, strong technical support and thoughtful after-sales Service guarantee, products are widely used in smart home, smart medical, smart office, automotive electronics and industrial control fields.

  • HLK-B40
  • HLK-B40
  • HLK-B40
  • HLK-B40
  • HLK-B40

Master-slave integrated Bluetooth module B40 BLE Bluetooth 5.1 wireless serial port transparent transmission module long-distance stable transmission

Smart home/home appliances, Internet of Things, instrumentation, industrial and agricultural control, medical health, automotive electronics, toy entertainment PageView : 4137

Master-slave integrated BLE Bluetooth 5.1

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BLE5.1 Bluetooth module

Compact size/low consumption/easy to use

product features


Functional structure diagram 1: One-to-one Bluetooth data transparent transmission

Functional structure diagram 2: Many-to-one Bluetooth data transparent transmission

Support BLE Bluetooth 5.1 protocol

Main frequency 48MHz, 32-bit ARM Cortex M3 core

Master-slave integration, can be set as master or slave mode, support binding encryption

In slave mode, up to 20 host devices can be connected at the same time

Ultra-long transmission distance, 40-100m in open environment

Low power consumption mode, sleep current as low as 6μA

Ultra-small size, only 14mm×9.5mm×2mm

Technical specifications


Network parameters

Bluetooth specificationBLE 5.1/L2CAP/ATT/GAP/HID

Frequency range2.40-2.48GHz

Transmit power-20dBm-10dBm adjustable

Receiving sensitivity-95dbm

Interface typeUART/PWM/GPIO/ADC

Maximum number of connections20

Broadcast interval50-2000mS

Connection interval7.5-4000mA

Custom broadcast dataSupport up to 20 bytes/custom broadcast data

Binding encryptionSupport PASKEY ENTRY pairing, 6-digit Pincode

Hardware parameters

Serial port parameters1200-921600/data bit 8/stop bit 1

Power inputDC1.8-4.2V/typical 3.3V, power supply capacity>80mA

IO port outputVoltage 2.9V-3.3V/Maximum output current 8mA

Power consumption/single stateTX(0dB)8mA/RX9.7mA/sleep average 6.1μA

Average working current*Please refer to the detailed specification (adjustable)

Storage temperature-40℃-105℃


Other parameters

Device typeSlave device

Work modeSlave mode, broadcast mode, sleep mode

Power and power consumption

Power input requirements

DC1.8~4.2V, typical value 3.3V, power supply capacity>80mA

IO output

Voltage 2.9~3.3V, maximum output current 8mA span>

Power consumption (in a single state)

Bluetooth TX current (0dB): 8mA

Bluetooth RX current: 9.7mA

Average sleep current: 6.1μA

Average working current (adjustable)

The average operating current is determined by the set transmit power, connection interval and broadcast interval , Which can be adjusted, the reference value under the default setting is as follows:

Enable hibernation: 50~80μA

Disable hibernation: 4~5mA

You can set the corresponding parameters to achieve lower power consumption< /span>

VCHG charger input voltage

DC4.8~5.2V, typical value 5V span>

Serial port parameters

Baud rate

1200,,2400,4800,9600,14400,19200,38400,57600 ,115200,230400,460800,921600

data bits


Stop position


Bluetooth parameters



Transmit power

-20~10dBm adjustable

Receiving sensitivity



Bluetooth V5.1(LE mode)


Maximum number of connections


Broadcast interval


connection interval


Custom broadcast data

supports up to 20 bytes of custom broadcast data span>

Binding encryption

support PASSKEY ENTRY pairing, 6-digit pincode span>


Working temperature



length 14mm×width 9.5mm×H2mm

  • Development Information B40蓝牙透传模块规格书 V1.1 201031 HLK-B40底板PCB原理图 用户手册
  • Software Application HLK-B40_release_1.0.6 HLK-B40_Demo(APP源码)
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