For tight-quarter designs, the OPL611 Series surface-mount infrared sensors measure 3 mm x 3 mm with a height of 1 mm and are mechanically and spectrally matched to the company’s OP180, OP200, OP250, OP270, and OP280 Series infrared LEDs. Available with buffer and inverter 10K internal pull-up as well as open collector outputs, the sensors feature a direct TTL/LSTTL CMOS interface. Minimum input power is 1.0 mW/cm2, Vcc ranges from 4.5 to 16V, and operating temperature ranges from -40°C to +85°C. OPTEK TECHNOLOGY INC., Carrollton, TX. (972) 323-2200.