The OP550B is a high-quality phototransistor IR chip designed for use in various electronic applications. This silicon-based 2-pin component is packaged in a convenient bag format, making it easy to handle and store. With its reliable performance and sensitivity to infrared light, the OP550B is a versatile choice for detecting and measuring light levels in a wide range of environments. Trust OPTEK TECHNOLOGY for top-notch components like the OP550B for your next project.