The Everlight Optical Sensors - Phototransistors ALS-PT19-315C/L177/TR8 is a light sensor designed for ambient SMD applications. It features a wide operating voltage range of 2.7V to 5.5V, a low current consumption of 1.5mA, and a fast response time of 10µs. The ALS-PT19-315C/L177/TR8 is designed to detect ambient light levels and can be used in a variety of applications, such as lighting control, motion detection, and security systems. It is also RoHS compliant and has a long service life of up to 10,000 hours. The ALS-PT19-315C/L177/TR8 is an ideal choice for applications that require reliable and accurate light sensing.