OP644SL

Series:	*
Packaging:	Bulk
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	25V
Current - Collector (Ic) (Max):	50mA
Current - Dark (Id) (Max):	100nA
Wavelength:	890nm
Viewing Angle:	--
Power - Max:	50mW
Mounting Type:	Surface Mount
Orientation:	Top View
Operating Temperature:	-65°C ~ 125°C (TA)
Package / Case:	Pill

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Optical Sensors - Phototransistors

Optical sensors, as the name suggests, are devices that can sense or measure light in some form and convert that light into electrical signals. These systems are usually applied in areas where a high speed of response is required and/or low power consumption is desired. Phototransistors, in particular, are one of the most common types of optical sensors that can be used to measure both static and dynamic light levels. The OP644SL is a common example of a phototransistor with a wide range of applications. This device is a 2 transistor phototransistor, offering visibility and ambient light sensing (ALS) functions with high current transfer ratios over infrared (IR) light at a wavelength of 940nm. This makes the OP644SL a particularly attractive solution for a number of different applications, including cell phones, tablet computers, and other consumer electronics.

Working Principle

At its most basic level, a phototransistor is a semiconductor device similar to a transistor. To understand its working principle, it’s helpful to first examine how a transistor works. A transistor is essentially a switch, made up of a number of electrical components. When a certain voltage is applied to the transistor, it allows electrical current to flow through, thus completing a circuit and turning on the device.Similarly, the OP644SL phototransistor works by sensing light using semiconductor materials such as silicon. When the device senses light, it allows a certain amount of electrical current to flow through. In the case of the OP644SL, when it senses infrared (IR) light at a wavelength of 940nm, it allows a very high current transfer ratio.

Applications and Uses

The OP644SL phototransistor is extremely versatile and can be used in a variety of different applications and markets. Its infrared (IR) sensitivity makes it useful in consumer electronics such as cell phones and tablet computers for visibility sensing and ambient light sensing (ALS). It can also be used for proximity sensing in electronic appliances, toys and gaming machines, and in industrial applications such as for monitoring and controlling the environment.In addition, the OP644SL makes a great solution for automotive applications, such as for controlling window and door locks, rearview mirrors, headlights and interior lighting. It’s also used in security systems for motion sensing.Finally, the OP644SL is also often used for optical communications, such as for fiber-optic systems or optical transceivers. This is due to its ability to sense barely visible light, making it an efficient solution for detecting extremely faint light signals at data rates of up to 10 Mbps.

Conclusion

The OP644SL is a highly versatile phototransistor that can be used in a variety of different applications and markets. It is designed to allow a high current transfer ratio when it senses infrared (IR) light at a wavelength of 940nm, making it especially useful for consumer electronics such as cell phones and tablet computers, as well as for industrial applications, automotive solutions, and optical communication systems.

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