Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Collector Emitter Breakdown (Max):	30V
Current - Collector (Ic) (Max):	4mA
Current - Dark (Id) (Max):	100nA
Wavelength:	940nm
Viewing Angle:	16°
Power - Max:	100mW
Mounting Type:	Through Hole
Orientation:	Top View
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	Radial

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Introduction

Optical Sensors are devices that detect the presence or absence of a light or other electromagnetic radiation in its field of view and convert the information into an electrical signal. Phototransistors are one type of optical sensor, which detect light particles within a certain wavelength range and generate a current that is proportional to the light intensity. Other types of optical sensors include photoresistors, photodiodes, and photomultipliers. The LTR-209 is a phototransistor designed for applications such as light detection, and photometry.

Features & Benefits of LTR-209

The LTR-209 offers wide-angle and wide-spectrum light detection, low-power operation, high sensitivity, and long-term stability. The phototransistor has a small die size, making it suitable for applications that require compact designs. It also features a low dark current and a response time of less than 50 microseconds, making it suitable for quick response in applications that require fast response time. The LTR-209 also comes with a built-in quench circuit that protects it from a sudden overload of current.

Applications and Working Principles

The LTR-209 is typically used in appliations such as light detection, optical switches, and photometry. In applications such as light detection, the light signal, which can be either visible, infrared, or ultraviolet, is detected by the phototransistor and converted into an electrical signal. The electrical signal is then amplified, usually through amplifying op-amps, and used to control other components in the circuit. Photometry is similar to light detection, except the light signals are used to measure the intensity and color temperature of the light source.The working principles of a phototransistor are based on the photovoltaic effect. When light is incident on the base-collector junction of the transistor, electrons on the n-type base region of the junction are excited and migrate across the junction into the p-type collector region. This creates a current flow proportional to the intensity of the light. This current flow is then measured using an external circuit and used to control other components in the circuit.

Conclusion

The LTR-209 phototransistor is a reliable and versatile device that is suitable for applications such as light detection, optical switches, and photometry. It features a wide angle and wide spectrum light detection, low-power operation, high sensitivity, and long-term stability. It also has a built-in quench circuit that protects it from a sudden overload of current. The phototransistor works on the principle of the photovoltaic effect, where light incident on the transistor produces a current flow proportional to the light intensity.

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