The SX1261MB2BAS and SX1262MB2CAS are fitted with the low power SX126x RF transceiver device family (SX1261 or SX1262) which features LoRa® long range modem and (G)FSK modem.

Hello World

Import programSX126X_PingPong_Demo



Import librarySX126xLib

SX1261 and sx1262 common library




Additional Application Code and Library Examples can be found toward the bottom of this page

SX126x mbed Component Shield


The SX1261 and SX1262 sub-GHz radio transceivers are ideal for long range wireless applications. Both devices are designed for long battery life with just 4.6mA of active receive current consumption. The SX1261 can transmit up to +15 dBm and the SX1262 can transmit up to +22 dBm with highly efficient integrated power amplifiers. These devices support LoRa® modulation for LPWAN use cases and (G)FSK modulation for legacy use cases. The devices are highly configurable to meet different application requirements utilizing the global LoRaWAN standard or proprietary protocols. The devices are designed to comply with the physical layer requirements of the LoRaWAN specification released by the LoRa Alliance. The device also support high performance (G)FSK modes for systems including WMBus, IEEE802.15.4g. The SX126x delivers exceptional phase noise, selectivity, receiver linearity and IIP3 for significantly lower current consumption than competing devices. The SX126x is intended for applications over a wide frequency range and is providing continuous frequency coverage, including all available sub-GHz frequency bands (168MHz, 433MHz, 470MHz, 780 MHz, 868MHz, 915MHz and 923MHz). The SX126x really offers the possibility of two modems in one single package and complies with both ETSI and FCC regulatory requirements.

LoRa® Modulation


LoRa®, Semtech’s proprietary modulation is a spread-spectrum technique that uses wideband linear frequency modulated pulses to encode information, whose frequency increases or decreases over a certain amount of time. As with other spread-spectrum modulation techniques, LoRa® uses the entire channel bandwidth to broadcast a signal, making it robust to channel noise. In addition, because LoRa® modulation uses a broad band of the spectrum, it is also resistant to long term relative frequency error, multi-path, fading and Doppler effects.

SX1261 and SX1262 Features

• LoRa® and FSK Modem
• 163 dB maximum link budget for SX1261 / 170 dB maximum link budget for SX1262
• +15 dBm high efficiency PA for SX1261 / +22 dBm high efficiency PA for SX1262
• Low RX current of 4.6 mA
• Using the device internal DC_DC
• Programmable bit rate up to 62.5 kbps LoRa® and 300 kbps FSK
• High sensitivity: down to -148 dBm
• 88 dB blocking immunity at 1 MHz offset
• Co-channel rejection of 19 dB in LoRa® mode
• FSK, GFSK, MSK, GMSK and LoRa® modulation
• Built-in bit synchronizer for clock recovery
• Automatic Channel Activity Detection (CAD) with ultra-fast AFC


The SX1261MB2BAS is especially designed for ISM frequency band available in Europe at 868 MHz.


The SX1262MB2CAS is especially designed for ISM frequency band available in North America at 915 MHz.


The SX1261MB2BAS and SX1262MB2CAS are controlled through the SPI bus at a maximum speed of 16Mbps. The connections are identical on each board so that the same software can used on any boards. All “Pass through” pins are not used in the operations of the SX126xMB2xAS boards and can therefore be used in connections of other boards for various purposes. The I2C and UART have especially been let free so that a variety of sensor can be connected to the boards, and thus enable long distance control of them.


1This pins is used to indicate if the SX126x board is fitted with a TCXO or a standard XTAL (0: TCXO, 1: XTAL).

2This pins is used to indicate if the device mounted on the board is a SX1261 or the SX1262 (0: SX1262, 1: SX1261).

3This pins is used to indicate the board matching frequency (0: 915 MHz, 1: 868 MHz)

Where to buy

SX1261MB2BAS (868 MHz):

Online Distribution Online Distribution

SX1262MB2CAS (915 MHz):

Online Distribution Online Distribution

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Hello World SX126X_PingPong_Demo Example does not compile! 1 07 Jan 2019 by wayne roberts