LTR-323DB

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Dark (Id) (Max):	30nA
Wavelength:	900nm
Viewing Angle:	60°
Power - Max:	150mW
Mounting Type:	Through Hole
Orientation:	Top View
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	Radial

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IntroductionOptical sensors are a type of electronic sensor which detect or measure a particular type of electromagnetic radiation emitted by light. Phototransistors are an important type of optical sensor and typically utilize a light-sensitive semiconductor device to detect the intensity and duration of a light source. The LTR-323DB is an example of a phototransistor which often used for applications in covert night vision or as a photoelectric switch. This article will discuss the LTR-323DB’s application field and working principle.Application FieldThe LTR-323DB is most commonly used for applications in night vision systems due to its desirable qualities. Specifically, it is used for mid-range levels of infrared radiation as its range of detection is relatively large. Additionally, it can detect light from all directions, allowing it to be used in a wide variety of systems. This makes it useful for any systems where thorough coverage is crucial, such as surveillance.The LTR-323DB is also used as a type of photoelectric switch. On the surface, it does not appear to differ much from other photoelectric switches. However, it does have a few notable advantages. For instance, it has a much greater maximum current of 700mA, compared to 300mA for most other transistors. This makes it far more versatile and can be used for more powerful applications.Working PrincipleThe LTR-323DB works by using a silicon phototransistor to detect light packets. There are three terminals on the phototransistor, either side of which a voltage is applied. When light is detected, a current flows through the phototransistor and is able to close or open an external circuit.In order to be activated, the phototransistor needs to receive a certain amount of light. This is known as the threshold (or "sun") level. If the amount of light received is below this threshold level, the transistor will remain inactive. Conversely, if the amount of light is above the threshold level, the transistor will be activated and, consequently, the external circuit can be closed or opened.This process happens very quickly. Once the target light is detected, the transistor can be activated within just 5µs. This makes the LTR-323DB ideal for systems in which response time is essential.ConclusionIn conclusion, the LTR-323DB is a type of phototransistor which is often used for covert night vision or as a photoelectric switch. It is a highly versatile device which can be used in a wide variety of applications due to its wide range of detection and its fast response time.

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