TLP577x GaAlAs Infrared LED & Photo ICs Toshiba TLP577x Series GaAlAs Infrared LED and Photo ICs consist of a GaAlAs infrared light-emitting diode and an integrated high-gain, high-speed photodetector. The ICs are housed in 6-pin SO6L packages which are 50% smaller than the 8-pin DIP package. These packages meet the reinforced insulation class requirements of international safety standards so the mounting area can be reduced in equipment requiring the safety standard certification.