powerful ARM® Cortex® M0 + 32-bit microcontroller with integrated 2.4 GHz transceiver

Key Features

  • Dimensions: 21 x 13 x 2.5 mm
  • Frequency: 2.4 GHz
  • Antenna:
    • deRFsamR21E-23S00: Chip ceramic
    • deRFsamR21E-23S20: U.FL and RF-pad
  • Storage: 4MBit SPI DataFlash for
    firmware updates over the air
  • Interfaces: SWD, UART, I2C, ADC, SPI, USB, GPIO
  • Connections: 27 pins, SMD
  • Side contacts in 50 mil / 1.27 mm grid
    deRFsamR21E-23S00 deRFsamR21E-23S20
    Version Range Special Frequency Typ Antenna
    deRFsamR21E-23S00 200 m DIV PA Sub GHz 2.4 GHz SMT THT C U P Shop
    deRFsamR21E-23S20 200 m DIV PA Sub GHz 2.4 GHz SMT THT C U P Shop
    • DIV Antenna diversity
    • PA Power amplifier
    • C Chip antenna
    • U U.FL connector
    • P RF pads


    The radio module series deRFsamR21E contains a powerful ATSAMR21E18 microcontroller with an integrated 2.4 GHz radio transceiver which supports the latest version 3.0 of radio protocol standard ZigBee. The 256 KB internal flash memory allows the usage of extensive program code like the ZigBee 3.0 firmware stack by Microchip. (Hint: This stack is only available at Microchip after registration) The onboard 4 MBit SPI DataFlash enables firmware updates over the air without any additional external components. The radio modules have a tiny weglassen footprint for SMD process in 50 mil / 1.27 mm grid.


    dresden elektronik offers two radio module variants which differs in their RF output:

    • deRFsamR21E-23S00:
      The onboard chip ceramic antenna allows for easy integration of the module into the application without special RF knowledge and therefore time of implementation and BOM cost may to be reduced.
    • deRFsamR21E-23S20:
      The onboard u.FL coaxial connector is suitable for external antenna applications. A coaxial connector pigtail from u.FL to e.g. SMA is furthermore necessary, depending on the application. The available RF-pad can be used to enable customized  RF-designs like external front-end implementation or antenna diversity.


    The radio module series deRFsamR21E is suitable for applications in the following areas:

    • ZigBee 3.0
    • Smart Home
    • Lighting
    • Home Automation
    • Wireless Sensor Networks
    • Industrial Controlling
    • Smart Metering


    The radio modules are CE-compliant according to RED 2014/53/EU as well as certified according to FCC Part 15C.