Blue Gecko BGM121 Bluetooth® Low Energy SiP Module

The World’s Smallest Bluetooth SiP Module

Silicon Labs’ BGM121 Blue Gecko Bluetooth SIP Module has +8 dBm TX power and 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. BGM121 also integrates a high performance, ultra robust antenna, which requires minimal PCB, plastic and metal clearance. The total PCB area required by BGM121 is only 51 mm². The BGM121 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
  • Bluetooth mesh capable

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
  • 8 dBm TX power

Low Energy Consumption:

  • 8.7 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 Bluetooth Low Energy SiP Module

Blue Gecko Bluetooth Low Energy SiP Wireless Starter Kit

The easiest way to begin development with Blue Gecko Bluetooth Low Energy SiP Modules is with the Bluetooth SiP Wireless Starter Kit.

Add to Cart

BGM121 Modules

Part Number Buy Data Sheet Antenna Package BLE Bluetooth 5 Mesh Range (m) Dimensions (mm) TX Power (dBm) RX Sensitivity (dBm) MCU Core RAM (kB) Flash (kB)
BGM121A256V2 PDF icon Internal Tray Yes Advertising Yes 200 6.5 x 6.5 x 1.4 
+8 -90 ARM Cortex-M4 32 256
BGM121A256V2R PDF icon Internal Reel Yes Advertising
Yes 200 6.5 x 6.5 x 1.4 
+8 -90 ARM Cortex-M4
32 256
BGM121N256V2 PDF icon RF Pad Tray Yes Advertising
Yes 200 6.5 x 6.5 x 1.4 
+8 -90 ARM Cortex-M4
32 256
BGM121N256V2R PDF icon RF Pad Reel Yes Advertising
Yes 200 6.5 x 6.5 x 1.4 
+8 -90 ARM Cortex-M4
32 256


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