The 6N135-L is an optocoupler from Lite-On. It is a motorized variably-attenuator with a digital-to-analog (D/A) converter and photo-transistor. It works by using a light link between a control circuit and the circuit it interfaces with. It is designed to accurately provide very fast response times and minimize crosstalk in noisy industrial environments. The 6N135-L is housed in an 8-pin dual in line package and has an operating temperature range of -40°C to +85°C. It also has an isolation voltage of 500VDC, making it suitable for use in a hospital or other similarly sensitive environment. With its low-cost and high reliability, the 6N135-L is a great choice for a variety of applications ranging from robotics to data acquisition.