Secrets of the RA-02 Lora Module: Silicon Reverse Engineering

A recent Ali - express Lora module, the "RA-02" Removing the RF shield shows a circuit board with 3 semiconductors: The SX1278 Lora module An RF switch A NPN Transistor Removing the SX1278 from it's package shows enables this die photo: Here is a close up of the VCO. 1st a photo focused on the metal and then focused on the diffusion layer below. 3D! photo of the RF switch, simple and elegant More…