Blue Gecko BGM123 Bluetooth® Module - SiP

The World’s Smallest Bluetooth SiP Module

Silicon Labs’ BGM123 Blue Gecko SiP Bluetooth Module has +3 dBm TX power is targeted for applications where ultra-small size, reliable high performance RF, low-power consumption and easy application development are key requirements. At 6.5 x 6.5 x 1.4 mm the BGM121 module fits applications where size is a constraint. BGM123 also integrates a high performance, ultra robust antenna, which requires minimal PCB, plastic and metal clearance. The total PCB area required by BGM123 is only 51 mm². The BGM123 also integrates a Bluetooth 4.2 compliant Bluetooth stack and it can also run end-user applications on-board or alternatively used as a network co-processor over one of the host interfaces.

Module Benefits

Integrated Bluetooth Radio and Antenna:

  • Excellent RF performance
  • Integrated hugh performance antenna
  • Fast time-to-market and low R&D costs

Bluetooth and regulatory certifications:

  • Minimal end product certification
  • Faster time-to-market
  • Proven platform

Pre-assembled and pre-tested platform:

  • Modules are pre-assembled
  • Radio is pre-tested
  • Firmware is pre-installed

Module Specifications


  • Bluetooth 4.2 compliant
  • Bluetooth 5 advertising

Low Power Wireless System-on-Chip:

  • High Performance 32-bit 38.4 MHz ARM® Cortex®-M4 with DSP instruction and floating-point unit for efficient signal processing
  • 256 kB flash program memory
  • 32 kB RAM data memory
  • 2.4 GHz radio operation
  • 3 dBm TX power

Low Energy Consumption:

  • 9.0 mA RX current at 2.4 GHz
  • 8.2 mA TX current @ 0 dBm output power at 2.4 GHz
  • 63 μA/MHz in Active Mode (EM0)
  • 2.5 μA EM2 DeepSleep current (full RAM retention and RTCC running from LFXO)
  • 2.1 μA EM3 Stop current (State/RAM retention)
  • Wake on Radio with signal strength detection, preamble pattern detection, frame detection and timeout

High Receiver Performance:

  • -90 dBm sensitivity @ 1 Mbit/s GFSK (2.4 GHz)

Wide Operating Range:

  • 1.85 V to 3.8 V single power supply
  • 2.4 V to 3.8 V when using DC-DC
  • Integrated DC-DC
  • -40 °C to +85 °C

Support for Internet Security:

  • General Purpose CRC
  • Random Number Generator
  • Hardware Cryptographic Acceleration for AES 128/256, SHA-1, SHA-2 (SHA-224 and SHA-256) and ECC


  • 6.5 mm x 6.5 mm x 1.4 mm

Wide Selection of MCU peripherals:

  • 12-bit 1 Msps SAR Analog to Digital Converter (ADC)
  • 2 × Analog Comparator (ACMP)
  • Digital to Analog Current Converter (IDAC)
  • 32 pins connected to analog channels (APORT) shared between Analog Comparators, ADC, and IDAC32 General Purpose I/O pins with output state retention and asynchronous interrupts
  • 8 Channel DMA Controller
  • 12 Channel Peripheral Reflex System (PRS)
  • 2 × 16-bit Timer/Counter
  • 3 + 4 Compare/Capture/PWM channels
  • 32-bit Real Time Counter and Calendar
  • 16-bit Low Energy Timer for waveform generation
  • 32-bit Ultra Low Energy Timer/Counter for periodic wake-up from any Energy Mode
  • 16-bit Pulse Counter with asynchronous operation
  • Watchdog Timer w/ dedicated RC oscillator @ 50 nA
  • 2 × Universal Synchronous/Asynchronous Receiver/Transmitter (UART/SPI/SmartCard (ISO 7816)/IrDA/I²S)
  • Low Energy UART (LEUART™)
  • I²C interface with SMBus support and address recognition in EM3 Stop

Getting Started with Blue Gecko SiP Bluetooth Module

Blue Gecko SiP Bluetooth Starter Kit

The easiest way to begin development with BGM123 Blue Gecko SiP Bluetooth Module is with the Bluetooth Module Starter Kit.

Add to Cart

BGM123 Modules

Part Number Buy  Data Sheet Antenna Package BLE Bluetooth 5 Range (m) Dimensions (mm) TX Power (dBm) RX Sensitivity (dBm) MCU Core RAM (kB) Flash (kB)
BGM123A256V2 PDF icon Internal Tray Yes Advertising 50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4 32 256
BGM123A256V2R PDF icon Internal Reel Yes Advertising
50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4
32 256
BGM123N256V2 PDF icon RF Pad Tray Yes Advertising
50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4
32 256
BGM123N256V2R PDF icon RF Pad Reel Yes
50 6.5 x 6.5 x 1.4 
+3 -90 ARM Cortex-M4
32 256

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