The OPTEK TECHNOLOGY part OP505A is an NPN Si Phototransistor designed for applications that require reliable and accurate light detection. It operates in the 850-1000nm wavelength range, making it suitable for various light sensing applications. With a wide 20° field of view, it can effectively detect light from different angles. The OP505A features a low dark current of 100nA, ensuring accurate readings even in low-light conditions. It also has a high breakdown voltage of 30V, making it resilient to voltage fluctuations and surges. Enclosed in a T1 (3mm) package, this phototransistor is easy to integrate into your existing circuits or designs. Its compact size makes it suitable for space-constrained applications, while still offering excellent performance.