Source Silkscreen SIL2104 QFN24 USB to UART bridge controller CP2104-F03-GMR on m.alibaba.com
CP2104 Programmer – ESProto
Amazon.com: YWBL-WH Converter Module CP2104 USB 2.0 to TTL UART 6PIN Module Serial Converter Board Module with Wire Support OS Windows 98/2000/XP/7/8/10 MAC OS-9 X-Windows CE Linux 2.40 or Higher Version, Module :