QSD122

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Optical Sensors - Phototransistors

Phototransistors are transistors that are sensitive to light. A phototransistor is composed of a semiconductor chip, a small base, a collector and an emitter. The light incident on the surface of a phototransistor generates a small current, which is the output signal of the phototransistor. Its application range covers optical communication, light detection, smoke and fire detection, and other aspects of detection.

QSD122 is a photo-transistor able to detect low-light levels. It is often used in medical, consumer electronics, automotive, and other electronic products. It is housed in a standard SOT-23 package, with a wavelength range of 250 to 1100 nm, responsivity of 0.1 A/W, and typical rise time of 10 ns. Additionally, The QSD122 is a flip chip phototransistor optimized for triggering applications like smoke and fire detectors. It is RoHS compliant and Halogen-Free.

The working principle of the QSD122 is the interaction between light and semiconductor material. When light is incident on the chip, a current is generated by the chip, and the value of the current is proportional to the intensity of the incident light, then the current can be amplified by the amplifier circuit, and then the signal of the amplifier circuit output can be used as a detection signal. The QSD122 phototransistor has FET structure and can directly detect light.

The QSD122 phototransistor is mainly used in fire alarms and smoke alarms, as well as medical endoscope imaging devices, optical communication receivers, infrared remote control receivers, and other signal sensors. When it is used as a fire or smoke detector, it can quickly detect the presence of light or smoke, giving a much faster response time than a traditional photocell. The QSD122 is also ideal for medical endoscopy because it can detect light through the endoscope tube with low power consumption.

This phototransistor uses a FET structure and will open a gate when there is sufficient light, which can be detected by an amplifier. Through this, it can detect the light and determine whether the light is within a certain range. It can also be used for light detection, such as range-finding and motion detection.

For optical communication receivers, optical signals from an optical fiber can be detected and converted into electrical signals. It is also used in infrared remote control receivers, such as TV remote controls and AC remote controllers, because it is sensitive to infrared light. In addition, because it has extremely low power consumption, it is suitable for applications that need to detect light for a long period of time.

The QSD122 phototransistor is an ideal choice for applications that require quick response time and low power consumption. It is relatively easy to use and can be used in a variety of applications. Its FET structure makes it very efficient and reliable in detecting light in low-light conditions.

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