AX5043 - Narrow-band Ultra Low Power RF Transceiver IC

The AX5043 is a single chip narrow-band RF transceiver for the 70MHz to 1050MHz frequency bands.

The AX5043 is a single chip narrow-band ultra-low-power ASK and FSK RF transceiver for the 27 MHz to 1050 MHz frequency bands. It offers the unique combination of ultra-low power consumption for transmit and receive operation combined with highest sensitivity and high selectivity. A link budget of 143 dB at 1 kbps is achieved, if the built-in forward error correction (FEC) is used this can be extended to 146 dB without extra external components. The AX5043 works perfectly down to 1 kbps in a 6.25 kHz channel.

An integrated voltage regulation system allows the direct use of batteries and short start-up times enable time- and energy-efficient protocols. Transmit power and receive characteristics do not change over the supply voltage range of 1.8 - 3.6 V.

The AX5043 supports FSK, MSK, 4-FSK, GFSK, GMSK, AFSK and ASK modulations. In transmit mode, all modulations are shaped. For FSK gaussian filters with BT=0.3 or BT=0.5 are available to meet the most stringent regulatory requirements. Power ramping can be configured without restrictions. Maximum output power level is 16 dBm.

Key Features:

  • Carrier frequency range 27 - 1050 MHz
  • Ultra-low power
  • Constant TX output power over the full VDD range of 1.8 - 3.6 V
  • Fully autonomous lowest power wake-on-radio mode (500 nA)
  • Packet RX/TX without microcontroller intervention

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

  • IoT (Internet of Things)
  • Automated Meter Reading (AMR)
  • Security Applications
  • Building Automation
  • Wireless Networks
  • Battery Powered Portable Applications
Part No. Description Pack Size

RF Tx/Rx IC, 70 - 1050MHz narrow-band, ultra low power, 28-pin QFN, 5mm x 5mm

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

Reel of 500
AX5043-1-TW30 RF Tx/Rx IC, 70 - 1050MHz narrow-band, ultra low power, 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
ADD5043-169-2-GEVK Pack containing 2 x AX5043-169 modules for the DVK-BASE-2-GEVK Each
ADD5043-433-2-GEVK Pack containing 2 x AX5043-433 modules for the DVK-BASE-2-GEVK Each
ADD5043-868-2-GEVK Pack containing 2 x AX5043-868 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 ADD5043-169-2-GEVK, ADD5043-433-2-GEVK or ADD5043-868-2-GEVK add-on kit.

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Last updated: 23 April 2018