AX5051 - Universal Low Power RF Transceiver IC

400 - 470MHz and 800 - 940MHz universal low-power RF transceiver IC

Universal low power RF transceiver

The AX5051 is a universal single-chip RF transceiver for the 433/868/915 MHz SRD bands. It is typically used for medium distances up to 1 km. The supported data rates for this transceiver are 1 - 600 kbps.

The AX5051 transceiver consists of an integrated RF front-end with modulator and demodulator, flexible communication controller and integrated voltage regulator. Base band data processing is implemented in the integrated communication controller for user-friendly communication and configuration via SPI interface. The integrated framing enables the use of low cost external micro-controllers.

Higher data rates of up to 350 kbps for FSK modulated data and 600 kbps for ASK/PSK modulated data differentiate this chip from the AXSEM narrow-band line of transceivers. The receiver sensitivities are -116 dBm at 1.2 kbps and -103 dBm at 100 kbps, the values can be reached for operation at 433 MHz, 868 MHz and 915 MHz. Together with an output power of up to 16 dBm this allows to build a system with an attractive link budget.

Designed for low power and direct battery operation

An integrated voltage regulation system allows the direct use of batteries and short start-up times enable time- and energy-efficient protocols. RX wake-on-radio operation with 1s duty-cycle at 100 kbps consumes just 5 μA. The high efficiency PA has a flat output power characteristic over supply voltage and temperature. These performance details make the AX5051 ideal for battery powered portable applications.

Advanced receiver, transmitter and radio controller

The AX5051 supports  FSK, MSK, PSK and ASK modulations. In transmit mode all modulations are shaped. The AX5051 features an easy to use protocol implemented in hardware. This guarantees shortest code size and lowest CPU usage of a microcontroller. CRCs are calculated automatically both in RX and TX. Digital spread spectrum is possible on all modulations.
External components are only a crystal, an antenna and a few passive components. All parameters of the AX5051 including modulation, frequency, deviation and output power can be programmed via an SPI interface. Systems built with the AX5051 provide cost-efficient, longest range bi-directional communication links.


  • Carrier frequency range 400 - 470 MHz and 800 - 940 MHz
  • Frequency step 1 Hz
  • Data rate RX&TX FSK 1 - 350 kbps
  • Data rate RX&TX PSK 10 - 600 kbps
  • Data rate RX&TX ASK 1 - 600 kbps
  • TCXO/XTAL typical frequency 16 or 24 MHz
  • RSSI step 0.1 dB
  • Channel filter bandwidth 40 - 600 kHz

RX @ 868 MHz, 1.2 kbps, FSK, h=8

  • Sensitivity (BER = 10-3) -116 dBm
  • RSSI range -116 ... -36 dB

RX @ 868 MHz, 100 kbps, FSK, h=1

  • Sensitivity (BER = 10-3) -103 dBm
  • RSSI range -103 ... -23 dB

TX @ 868 MHz

  • Output power programmable range -10 ... -15 dBm
  • Output power dependence on VDD and temperature < +/- 0.5 dB


  • Supply voltage range 2.2 ... 3.6 V
  • RX current @ 868 MHz (LP mode) 17 mA
  • TX current @ 868 MHz, 10 dBm, FSK 28 mA


  • FCC Part 15
  • EN 300 220 V2.3.1
  • Wireles M-Bus T-mode
  • 802.15.4
  • ARIB

Axsem Product Selector

Part No. Description Pack Size
AX5051-1-TA05 RF Tx/Rx, 400 - 470MHz & 800 -940MHz universal low-power IC, 28-pin QFN, 5mm x 5mm. Reel of 500
AX5051-1-TW30 RF Tx/Rx, 400 - 470MHz & 800 -940MHz universal low-power IC, 28-pin QFN, 5mm x 5mm. Reel of 3000
Development Kits

Development kit for evaluating and developing applications using ON Semiconductor's family of high performance RF devices and microcontrollers.


  • 2 Main boards
  • Debug adapter
  • Debug cable
  • USB cable
  • Batteries
  • Documentation

* One of the Add-On Module Kits below must be ordered at the same time. The Base Kit is not supplied with any RF transceivers.

Add-On Module Kits for DVK-BASE-2-GEVK
ADD5051-868-2-GEVK Pack containing 2 x AX5051-868 modules for the DVK-BASE-2-GEVK Each

AX5051 is supported by the DVK-BASE-2-GEVK development kit. This is a complete and flexible ready-to-go solution for easy testing, evaluation and development with AXSEM RF ICs. It is suited for real performance tests using professional lab equipment, as well as for application code development.

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Last updated: 19 January 2016