PT908-7C-F

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Optical sensors have become increasingly commonplace in a wide variety of applications due to their ability to detect light and convert it into electrical energy. The most common type of these sensors are phototransistors, which are semiconductors that use light to switch between a low-resistance, or ‘on’, state and a high-resistance, or ‘off’, state. One such phototransistor is the PT908-7C-F, which is an integrated, 8-pin NPN Common Base phototransistor.

PT908-7C-F is a specialized phototransistor that offers high speed, low noise and high sensitivity. It is ideal for signal switching, intelligence detection, remote control, and light control applications. It has a wide range of applications including light sensors, optical switches, SMT optoelectronics, remote control systems, and automotive door open sensing devices.

The PT908-7C-F phototransistor is made up of two main components: a photo-detector and a transistor. The photo-detector is a combination of a light-sensitive diode connected in reverse bias and a base-collector junction of a bipolar NPN transistor. The transmitting part of the phototransistor is the bipolar NPN transistor. When illuminated with light, the reverse-biased diode generates carriers that are converted into current. This current passes through the base-collector junction and is amplified by the NPN transistor.

The working of the PT908-7C-F phototransistor can be explained with the help of a simple circuit. The circuit consists of a 9V battery, a current-limiting resistor, the phototransistor, and a load resistor. When no light is present, the phototransistor remains in the off state, blocking the current and the voltage across the load resistor. But when light falls on the phototransistor, it becomes conductive and the current flows through it, producing a voltage drop across the load resistor.

The PT908-7C-F phototransistor is a versatile and useful light sensor due to its wide range of applications. It is suitable for use in both new and existing applications, and its simple operation makes it easy for designers to implement it in a variety of ways. It is an ideal choice for a variety of applications, including light sensors, optical switches, SMT optoelectronics, remote control systems, and automotive door open sensing devices.

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