ALS‑PT19 ,Ambient Light Sensor (SMD Phototransistor), 2.5–5.5 V

The ALS‑PT19 is a compact, surface-mount phototransistor designed to sense visible light with a spectral response closely matching the human eye. Within a supply range of 2.5 V to 5.5 V, the sensor outputs a current proportional to ambient illumination, which can be easily converted to voltage with a pull-up resistor. Its low sensitivity variation across different light sources, wide operating temperature (-40 °C to +85 °C), and excellent linearity make it ideal for battery-powered devices, display backlight control, wearable tech, and automated lighting systems. RoHS-compliant, the ALS‑PT19 is designed for modern electronics and e-textiles.

 
Key Features:

• Spectral Response aligned with human vision, high IR rejection 
• Analog Light-to-Current Output, high linearity
• Supply Range: 2.5 V–5.5 V, ideal for microcontrollers
• Operating Temperature: -40 °C to +85 °C for harsh environments
• Compact SMD Package: approx. 1.7 × 0.8 × 0.6 mm
• Low Source Variation between light types 
• RoHS-compliant and lead-free