AX5243 - Compact Narrow-band, Ultra Low Power RF Transceiver IC

The AX5243 is a narrow-band ultra low power RF transceiver for the 27MHz to 1050MHz frequency bands, in a tiny 4mm x 4mm QFN package.

The AX5243 is a true single chip ultra-low power narrow-band CMOS transceiver for use in licensed and unlicensed bands from 27 and 1050 MHz. The on-chip transceiver consists of a fully integrated RF front-end with modulator, and demodulator. Base band data processing is implemented in an advanced and flexible communication controller that enables user friendly communication via the SPI interface. It supports any data rate from 0.1 kbps to 125 kbps for FSK, 4-FSK, GFSK, GMSK, MSK, ASK and PSK modulations.

The AX5243 can be operated from a 1.8 V to 3.6 V power supply over a temperature range of -40°C to 85°C. It consumes 7 - 48 mA for transmitting at 868 MHz carrier frequency, 4 - 51 mA for transmitting at 169 MHz depending on the output power. In receive operation, it consumes 9 - 11 mA at 868 MHz carrier frequency and 6.5 - 8.5 mA at 169 MHz. It also features an internal lowest power fully integrated oscillator. In default mode the frequency of oscillation is 640 Hz +/- 1.5%, in fast mode it is 10.2 kHz +/- 1.5%. These accuracies are reached after the internal hardware has been used to calibrate the low power oscillator versus the RF reference clock.

The AX5243 features make it an ideal interface for integration into various battery powered solutions such as ticketing or as transceiver for telemetric applications e.g. in sensors.


  • Carrier frequency range of 27 - 1050 MHz
  • High sensitivity and high selectivity Receiver
  • Low power oscillator and Wake on Radio (WOR) mode
  • Automatic Frequency Control (AFC)
  • Wide frequency range to work with
  • Data rates from 0.1 kbps to 125 kbps and 45 dB adjacent channel rejection
  • Allows for very low average receiver power
  • Capable of tracking transmitter frequency within the RX filter band width

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

  • Internet of Things (IOT)
  • Automatic Meter Reading (AMR)
  • Security Applications
  • Building Automation
  • Wireless Networks
Part No. Description Pack Size

RF Tx/Rx IC, 27 - 1050MHz narrow-band, ultra low power, 20-pin QFN, 4mm x 4mm

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

Reel of 500
AX5243-1-TW30 RF Tx/Rx IC, 27 - 1050MHz narrow-band, ultra low power, 20-pin QFN, 4mm x 4mm 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

ADD5243-868-2-GEVK Pack containing 2 x AX5243 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 ADD5243-868-2-GEVK add-on kit

Related Products

Recently Viewed Products

Last updated: 23 April 2018