Optical Sensors - Phototransistors

The SFH 310-2/3 is an optically active bipolar transistor designed for use as an optical receiver in low level control applications such as photocouplers, photodiodes, and phototransistors. It is well suited for applications in lighting control systems, nav systems, medical equipment, and security and CCTV systems. The SFH 310-2/3 has a wide range of applications in refrigeration, digital control, home appliances, and automotive electronic systems. It is ideal for use in various automation systems, automotive electronics, computer peripherals, and security systems. The SFH 310-2/3 is a bipolar phototransistor which combines a photosensitive base and a transistor in a single convenient package. The SFH 310-2/3 can be used in circuits requiring a high-gain current-carrying device with high speed response. The SFH 310-2/3 is a complement to the SFH 310-3/4 photodetector.

Application Field of SFH 310-2/3

The SFH 310-2/3 application field mainly involves the use of a phototransistor as a light sensitive current amplifier and switch. This type of device is used in a variety of applications, such as photocoupler circuits, motion detectors, IR remotes, sensing devices, and small automated systems. It can synthesize the ambient light to detect an object or discriminate between two objects, and in this way provide very accurate sensing functionality. The SFH 310-2/3 is also often used for detecting the presence of an individual in a room, a vehicle in a car park, and various other applications. It can also be used to measure light levels, such as for measuring photoresistor outputs. SFH 310-2/3 is also suitable for use in applications such as security systems and robotics.

Working Principle of SFH 310-2/3

The SFH 310-2/3 is a phototransistor, which means that it generates current when exposed to light of a certain wavelength. It works by using the photoelectric effect-the effect of light on a specially designed material, the emitter. When photons hit the emitter material, electrons from the material absorb the energy of the light and become dislodged from their regular atomic orbitals. These electrons then move to the collector layer, where the electric field created by the transistor forces them to remain. The current generated is proportional to the intensity of the light, and the speed at which the electrons move is also proportional to the intensity of the light. The SFH 310-2/3 uses this current to create an electrical signal that is then output to the circuit or device being controlled.

Conclusion

The SFH 310-2/3 is an optically active bipolar transistor ideal for use in many applications, including photocouplers, photodiodes, and phototransistors. It can synthesize the ambient light to detect an object or discriminate between two objects, and in this way provide very accurate sensing capability. The SFH 310-2/3 operates using the photoelectric effect, where photons hit the emitter material and distance electrons from their regular atomic orbitals. These electrons move to the collector layer, where the electric field created by the transistor forces them to remain. The current generated is proportional to the intensity of the light, and the speed at which the electrons move is also proportional to the intensity of the light.