This IR LED/phototransistor pair is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features a high-performance, low-current QTRX sensor with lenses

Specifications:

• Dimensions: 5.0 20.0 4.4 mm
• Operating voltage: 2.9 V to 5.5 V
• Sensor type: QTRX
• Sensor count: 1
• Full-brightness LED current: 3.5 mA (independent of supply voltage)
• Max board current: 5 mA
• Output format: analog voltage (0 V to VCC)
• Optimal sensing distance: 10 mm
• Maximum recommended sensing distance: 30 mm
• Weight: 0.25 g