PT28-21B/TR8

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Optical Sensors - Phototransistors are optical sensing devices that produce an electrical output in response to an incident light. The PT28-21B/TR8 is a phototransistor that is designed for use in applications involving light control. The transistor is sensitive to radiation between the wavelengths of 400nm and 1000nm, and it has a built-in RC load enabling it to be used in a wide range of applications.

The PT28-21B/TR8 is a two-terminal device that uses two separate terminals for the collector and emitter. The phototransistor has a built-in silicon photocell that generates an electric current when exposed to light. This current is then amplified by the transistor to create a voltage output. The output of the phototransistor is the result of the amount of light that it receives and can vary from a few millivolts to a few volts.

The working principle of a phototransistor is based on the photoelectric effect. In this effect, a photon (aquantum of light) emits an electron when it hits a metal surface. This is known as the photoemission effect. When the photoemission effect is used in a phototransistor, electrons are generated by the metal surface and are then directed to the base of the transistor. These electrons are then amplified by the transistor to create a voltage output, which is then sent to the collector of the phototransistor.

The PT28-21B/TR8 is most commonly used for applications such as light control and sensing. It can be used to sense the level of light in an environment or to detect motion. It can also be used to activate or deactivate a circuit depending on the amount of light it receives. The phototransistor is also suitable for use in portable electronic devices where a simple light sensor is needed.

The PT28-21B/TR8 is widely used in applications such as security systems, automotive lighting, medical devices, audio-visual equipment, and consumer electronics. It is also commonly used in robotic applications, as it can detect the presence of an object and react accordingly. The transistor is also used in infrared and other optical-based communication systems to detect and transfer signals.

The PT28-21B/TR8 has excellent electrical characteristics, and it is capable of high speed switching. It is highly reliable and has a long life, making it suitable for many applications in harsh operating environments. It is also able to withstand highly varying temperatures, and its small size makes it suitable for placement even in confined areas.

The PT28-21B/TR8 is a highly versatile and reliable phototransistor suitable for a wide range of applications. It is capable of generating a voltage output in response to an incident light and is widely used for applications involving light detection and control. Its small size makes it ideal for use in portable devices, while its ability to withstand extreme temperature variations makes it especially suitable for use in harsh operating environments.

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