SparkFun
ALS-PT19 Light Sensor
The ALS-PT19 is a compact SMD ambient light sensor, significantly smaller than standard through-hole alternatives like the TEMT6000. Functioning as an NPN ph...
The ALS-PT19 is a compact SMD ambient light sensor, significantly smaller than standard through-hole alternatives like the TEMT6000. Functioning as an NPN phototransistor, it provides an analogue voltage output proportional to ambient light levels — making it easy to integrate into light-sensing projects.
Key Features
- Ultra-Compact SMD Package – Much smaller than standard light sensors for space-constrained designs
- Wide Supply Voltage – Operates from 2.5V to 5.5V, compatible with both 3.3V and 5V systems
- Analogue Output – NPN phototransistor output for simple analogue reading
- Ambient Light Sensing – Spectral response tuned to visible light
Ideal For
- Ambient light detection and automatic brightness control
- Space-constrained projects requiring a small-footprint sensor
- Wearable electronics and portable devices
- Light-level monitoring and data logging
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- Ambient light sensor
- A sensor that measures the general brightness of light falling on it, similar to how a device can adjust screen brightness automatically. It matters when you want a project to react to room lighting, daylight, shadows, or covered/uncovered conditions.
- phototransistor
- A light-sensitive transistor that changes its electrical output when light hits it. Compared with a modulated IR receiver, a simple phototransistor can be more affected by ambient light, so it may need extra filtering or careful setup.
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Sensors & Input
ALS-PT19-315C-L177-TR Datasheet
Datasheet · 242.9 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 338.9 KB · Click any page to view full size
Related Tutorials
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