BUY RN2901 https://www.utsource.net/itm/p/11278843.html
RN2901 PNP+PNP Complex Bipolar Digital Transistor -50V -100mA HEF=30 R1=R2=4.7KΩ 200mW/0.2W SOT-363/US6/SC70-6 marking YA switching inverting interface driver circuit
Description: The RN2901 is a LoRaTM module by Microchip Technology. It is a low-power, long-range, secure, and cost-effective wireless transceiver. Features: Integrated LoRaWAN protocol stack Integrated RF transceiver Integrated power amplifier Integrated temperature sensor Integrated low-noise amplifier Integrated voltage regulator Integrated antenna switch Integrated SPI interface Integrated UART interface Integrated ADC Integrated RTC Integrated 32-bit ARM Cortex-M0 processor Small form factor (SOT-363/US6/SC70-6) Applications: Smart metering Asset tracking Home and building automation Industrial monitoring and control Agriculture Security systems Wireless sensor networks (For reference only)