Tinksky FT232RL FTDI USB2.0 to TTL Serial Converter Adapter Module for Arduino Use a 6-pin header on the bottom, which makes it smaller and more compact. Support 3.3V, 5V. Chipset FT232RL. USB has power over current protection, 500mA self-recovery fuse. RXD TXD-transceiver communication display. Pin definition: DTR, RTS, BLK, GRN, GND.