H21A2 Sensors, Transducers

Series:	--
Packaging:	Bulk
Part Status:	Active
Sensing Distance:	0.118" (3mm)
Sensing Method:	Transmissive
Output Configuration:	NPN - Open Collector/Light-ON
Current - DC Forward (If) (Max):	3mA
Current - Collector (Ic) (Max):	50mA
Voltage - Collector Emitter Breakdown (Max):	30V
Response Time:	8µs, 50µs
Operating Temperature:	-25°C ~ 85°C
Mounting Type:	Through Hole, Flange
Package / Case:	Slotted, PC Pins
Type:	Unamplified

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The H21A2 slot-type photointerrupter transistor output is a type of optical sensor which utilizes the blocking and transmission of visible red light to detect the presence of an object. It is typically used in applications such as the detection of printed circuit boards and other surface structures, for detecting the passage of ferrous and non-ferrous objects when used as an encoder, and as a counter or timer. The H21A2 slot-type photointerrupter transistor output consists of an optical emitter and a phototransistor detector. The emitter is a high-speed, highly efficient gallium arsenide (GaAs) infrared LED, and the phototransistor is a silicon-based photodetector. These two components are packaged in an epoxy and mounted to a printed circuit board. The optical emitter emits a narrow beam of light at a predetermined wavelength and intensity, which is concentrated in the slot or gap between the emitter and the detector. When an object passes through this gap, the light is blocked and no longer shines onto the detector, triggering the output signal. The output signal from the H21A2 photointerrupter transistor output depends on the type of package and the situation. Some versions are configured to produce a digital signal, one that is fast enough to be used as an encoder, while others can be used as a counter or timer, with a pulse width modulation (PWM) output signal. This PWM output can be used to provide a stepwise or continuous output that can be used to detect the presence or absence of an object in the slot or gap. The H21A2 photointerrupter transistor output is particularly useful in applications that require reliable and instantaneous detection of objects with minimal false alarm rate. It is highly reliable in detecting low, medium, and high-speed signals, and is also very suitable for detecting printed circuit boards and other surface structures. The H21A2 photointerrupter transistor output is a cost-effective and reliable sensing solution for industrial applications. It is versatile in its applications and easy to use. It is also resistant to environmental conditions such as dust, moisture, vibration, and electromagnetic interference. It is suitable for use in industrial, automotive, medical, and consumer electronics environments. The H21A2 photointerrupter transistor output is designed for applications with high reliability and accuracy, and is suitable for a variety of sensing requirements. Its design ensures high-speed communication between the sensor and the device, and it offers the user a cost-effective and reliable operation. The optoelectronic components of the device have a high tolerance to electromagnetic interference and are resistant to environmental conditions such as dust and moisture. The optoelectronics are also designed for fast response times. The optoelectronics also have a low power consumption, and the optoelectronic components have a long life. The optoelectronics are also designed for use with a wide range of wavelengths. The H21A2 photointerrupter transistor output is suitable for use in the detection of printed circuit boards and other surface structures, as well as for the detection of ferrous and non-ferrous objects when used as an encoder. It is also used as a counter or timer, with a pulse width modulation (PWM) output signal. It is a cost-effective and reliable sensing solution that offers users reliability, accuracy, and fast response times.

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