SD2440-004

Series:	*
Packaging:	Bulk
Part Status:	Obsolete
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Collector (Ic) (Max):	7mA
Current - Dark (Id) (Max):	100nA
Wavelength:	--
Viewing Angle:	48°
Power - Max:	125mW
Mounting Type:	Surface Mount
Orientation:	Top View
Operating Temperature:	-55°C ~ 125°C (TA)
Package / Case:	Mini-pill

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Optical Sensors - Phototransistors

A phototransistor, also known as a light-activated transistor, is an optical sensor which responds to light intensity. The most common type of phototransistor is the SD2440-004. It consists of an integrated light-sensitive semiconductor chip with an output transistor in a single package. The semiconductor chip is usually made of cadmium sulfide (CdS) or gallium arsenide (GaAs).The SD2440-004 works by sensing the amount of incident light. When exposed to light, the semiconductor chip produces an electric current that is amplified by the output transistor. The output current is then sent to an external circuit for further processing. The gain of the phototransistor is determined by the area of the semiconductor chip and the values of the surrounding electrical components.The primary application of the SD2440-004 is in photolithography. Photolithography uses light to transfer a pattern from a mask to a photosensitive material in order to create a circuit. The SD2440-004 is used as an input photodetector to detect the intensity of the light and convert it into an electrical signal for processing.Another application for the SD2440-004 is in the field of optical communications. In this field, light is used to transmit data between two remote points. The SD2440-004 is used to detect the optical signal and convert it into an electrical signal. This signal is then processed and transmitted to the destination.The SD2440-004 also finds applications in light-emitting diode (LED) and laser-based medical instruments. In this application, the phototransistor is used to detect the light emitted from an LED or laser to measure the intensity of the light. This measured light intensity is then used to detect the presence of certain molecules in a biochemical sample, enabling medical practitioners to diagnose various diseases.The SD2440-004 is also used as a light sensor in robotics to detect the presence of obstacles in the robot’s path. By placing the phototransistor in the robot’s path, the SD2440-004 will detect the amount of incident light and transmit an electrical signal to the robot’s controller. This signal can be used to control the robot\'s actions and avoid obstacles.The SD2440-004 is a highly sensitive optical sensor and can be used for a variety of applications. Its small size, high sensitivity and low power consumption make it an ideal choice for applications where space is limited and power consumption needs to be minimized.

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