Datasheet for the CNY70, a Vishay reflective optical sensor that combines an infrared emitter and a phototransistor in one leaded package. The 243 KB PDF lists pinout, recommended sensing distance, current transfer characteristics and absolute ratings. It is commonly found in line-following robots, encoders and paper or object detectors. When repairing such circuits, check the LED current-limiting resistor, the phototransistor load resistor and contamination of the sensor face, which reduces the output signal.
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