PT26-21B/TR8

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Optical sensors are used to detect visible, infrared (IR), and ultraviolet (UV) light. Phototransistors, also known as photodarlington transistors, are one type of optical sensor. This article discusses the application field and working principle of the PT26-21B/TR8 Phototransistor.

PT26-21B/TR8 Phototransistors are used to detect optical signals and convert them into electronic signals. This type of phototransistor is designed with a mounting bracket that offers greater stability than a standard phototransistor, thus ensuring reliable operation. The PT26-21B/TR8 has a wide spectral response from 350nm to 1100nm with strong resistance to ambient light. It is designed with an impressive dynamic range, allowing it to accurately detect light signals over a wide range of levels.

The PT26-21B/TR8 is widely used in various applications including infrared remote control systems, optical positioning systems, navigation systems, optical communications, light sensing systems, and light actuated systems. It is also used in photography, optical inspection, lighting control, and other light sensing applications. The phototransistor is highly reliable, with a life expectancy of up to 100,000 hours.

The PT26-21B/TR8 operates on the principle of photoconductive gain. Photoconductive gain occurs when a photon of light is absorbed by the phototransistor, causing an increase in the flow of current. This increase in current causes the voltage to drop across the phototransistor, creating a decrease in the resistance in the transistor\'s base-emitter junction. The decrease in resistance causes an amplification of current through the transistor. The amplified current is then sent to the output of the phototransistor.

The PT26-21B/TR8 has a fast reaction time, with a response time of less than 10 microseconds. This allows the phototransistor to respond quickly to changes in light levels and is well suited for applications that require a quick response. The PT26-21B/TR8 is designed with a reverse bias voltage of up to 15V, which allows it to be used in a wide range of applications. The phototransistor also has a low power consumption and a small package size, making it easy to install and use.

In conclusion, the PT26-21B/TR8 is an excellent choice for a wide range of optical sensing applications and is designed with features that ensure reliable and accurate operation. It has a wide spectral response, fast response time, low power consumption, and small package size, making it an ideal choice for many applications.

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