PT928-6C-F

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Optical sensors are devices that are used to measure light in detecting information. Phototransistors are one type of these devices and are commonly used in applications such as circuit protection, movement sensing, detection of ambient light levels, and presence detection. PT928-6C-F is an example of a phototransistor that is widely used in various applications. This article discusses the application field and working principles of PT928-6C-F in detail.

PT928-6C-F is a bipolar-type NPN phototransistor with a maximum collector current of 500 mA. It features an active area of 0.01 – 0.02 ㎠, a maximum supply voltage of 30 V, and a total power dissipation of 500 mW. Along with its high gain, low saturation voltage, and high sensitivity, PT928-6C-F also has a built-in light shield for noise suppression which makes it suitable for light intensity sensing applications. On the other hand, it can also be used as a regular transistor in digital circuits, making it versatile for different types of applications.

One of the most common application fields of PT928-6C-F is in optical detection circuits. It is widely used in optical sensors for detection of ambient light levels. In such applications, PT928-6C-F is typically paired with a light emitting diode (LED) to form an optical sensing circuit. In the circuit, when the LED is turned on, it emits infrared light to be received by the phototransistor. The phototransistor then converts the light energy into electrical energy, providing an electrical signal output that can be used in further detection systems.

Aside from light level detection, PT928-6C-F can also be used in motion sensing systems. It is commonly used in detecting the presence of moving objects such as cars, animals or people in a certain area. In this application, PT928-6C-F works together with the same LED that emits infrared light that is sensed by the phototransistor. When an object passes within the sensing area, the motion is detected and the phototransistor outputs an electronic signal which can be used by the detection system.

In addition, PT928-6C-F is often used for circuit protection applications. In this application, the phototransistor works in conjunction with the LED to detect any potential overcurrent and short circuit conditions. When the current goes above the preset level, the phototransistor output is redirected to the circuit protection device, which will then trigger an electronic signal in order to safeguard the circuit.

The working principle of PT928-6C-F is based on the photoelectric effect. When light with a certain wavelength is shone onto its active area, it creates an electric charge at the base-collector junction. This charge produces a current which is then collected by the transistor. The current is then amplified and diverted to another circuit, providing an electronic signal that can be used for various applications.

In conclusion, PT928-6C-F is a widely used phototransistor with various application fields. It is commonly used in optical detection circuits for detecting light levels, motion sensing systems for detecting the presence of objects, and circuit protection applications for shielding the circuit against overcurrent and short circuits. Its working principle is based on the photoelectric effect where light energy is converted into electrical energy at the base-collector junction. As such, this phototransistor provides a reliable and efficient solution for various sensing applications.

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