TOSHIBA PHOTOCOUPLER GaA As IRED PHOTO-IC TLP2066 Manual(1)(1) User Manual TLP2066 is a photocoupler produced by Toshiba. It uses GaAℓAs light-emitting diode and an integrated high-gain, high-speed photodetector, and works at 3.3V. It supports the highest transmission speed of 20MBd.