AX5051 - Universal Low Power RF Transceiver IC

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

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.

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.


  • Supported modulations: FSK, MSK, PSK and ASK
  • Programmable channel filtering
  • Communication with the device via SPI interface
  • Optional data transfer can be handled via a UART interface
  • Supports HDLC and Raw frames in hardware
  • Automatic frequency control (AFC)
  • Integrated RX/TX switching with differential antenna pins
  • RF Carrier and FSK deviation programmable in 1 Hz steps
  • Brown-out detection
  • Freely programmable general purpose IO's

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

  • Sensor applications
  • Home automation
  • Automatic meter reading
  • Active RFID
  • Wireless audio
Part No. Description Pack Size

RF Tx/Rx, 400 - 470MHz & 800 -940MHz universal low-power IC, 28-pin QFN, 5mm x 5mm.

*Pack size being discontinued - LTB before 30/9/2018

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

The DVK-2 is the second-generation development kit for high performance RF devices and microcontrollers. The complete development system includes all hardware and software necessary to quickly develop applications based on the ON Semiconductor AX series of wireless products. The DVK-2 features the AX8052F100 ultra-low-power microcontroller on the main boards. It allows developers to design, program and evaluate their applications using radio chips and microcontrollers under real world conditions. A range of RF modules with different RF ICs for various RF carrier frequencies are available as add-ons.


*Requires ADD5051-868-2-GEVK add-on kit

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Last updated: 23 April 2018