TCST1202

Series:	--
Packaging:	Tube
Part Status:	Active
Sensing Distance:	0.122" (3.1mm)
Sensing Method:	Transmissive
Output Configuration:	Phototransistor
Current - DC Forward (If) (Max):	60mA
Current - Collector (Ic) (Max):	200mA
Voltage - Collector Emitter Breakdown (Max):	70V
Response Time:	10µs, 8µs
Operating Temperature:	-55°C ~ 85°C
Mounting Type:	Through Hole
Package / Case:	PCB Mount
Type:	Unamplified

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Introduction:TCST1202 is a Transistor Output Slot Type Photointerrupter that belongs to Optical Sensors. This type of optical sensors are used to detect objects or distances between two points. This application note will first explain what is a Transistor Output Slot Type Photointerrupter, then it will discuss about the different applications of this type of optical sensor and finally its working principle. What is a Transistor Output Slot Type Photointerrupter?A Transistor Output Slot Type Photointerrupter (TCST1202) is an optical position sensing device consisting of an optoelectronic transmitter and receiver coupled into a single package. A light source, usually a light emitting diode (LED) emits infrared light. This light is focused onto the receiving element, such as a phototransistor and depending on the distance between the two, the phototransistor will operate either normally or at a reduced response. The Transistor Output Slot Type Photointerrupter has two slots, one for the transmitter and the other for the receiver. The emitted light is focused on the gap between these two slots, causing the phototransistor to switch between ON and OFF states when the target object passes through the gap.Application and UsesThe Transistor Output Slot Type Photointerrupter is widely used for many different applications, including:• Counting objects and measuring distances: The Transistor Output Slot Type Photointerrupter is a reliable tool for counting the number of objects that pass through a given area or for measuring the distances between two points. • Security systems: The Transistor Output Slot Type Photointerrupter can be used to detect any suspicious or unauthorized access to restricted areas. • Bar-code scanning: The high resolution of the Transistor Output Slot Type Photointerrupter allows for accurate reading of bar-codes.• Measurement of power: The Transistor Output Slot Type Photointerrupter is a very reliable tool for measuring the power input or output in electrical systems. • Automation: The fast response time of the Transistor Output Slot Type Photointerrupter makes it ideal for many automation applications, such as controlling motors or switching mechanisms.Working PrincipleThe working principle of the Transistor Output Slot Type Photointerrupter is based on the semiconductor physics of optoelectronics. The TCST1202 consists of two parts, the transmitter (LED) and the receiver (phototransistor). When a target object passes through the gap between the two slots, the LED emits a beam of infrared light which is then focused onto the phototransistor. This causes a change in the current flowing through the phototransistor, leading to a change in the electrical parameters of the Transistor Output Slot Type Photointerrupter. When the object is in the gap, the LED emits a continuous beam of light, causing the phototransistor to become saturated. This saturation will cause a voltage drop across the phototransistor, resulting in a “low” output signal from the Transistor Output Slot Type Photointerrupter. When the object moves out of the gap, the LED stops emitting a beam of light and the phototransistor will become unsaturated. This will cause a voltage drop across the phototransistor, resulting in a “high” output signal from the Transistor Output Slot Type Photointerrupter. The Transistor Output Slot Type Photointerrupter is widely used in many applications due to its accuracy and reliability. In summary, the TCST1202 is a Transistor Output Slot Type Photointerrupter that works on the optoelectronic principles and can be used to detect objects or distances between two points. ConclusionTCST1202 is a Transistor Output Slot Type Photointerrupter that belongs to Optical Sensors. This application note has discussed the different applications of this type of optical sensor and its working principle. The Transistor Output Slot Type Photointerrupter is widely used for many different applications, including counting objects, security systems, bar-code scanning, measuring power and automation. The working principle of the Transistor Output Slot Type Photointerrupter is based on the semiconductor physics of optoelectronics which can be used to detect objects or distances between two points.

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