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H21A2 Optical Switch
Product Overview
Category
The H21A2 optical switch belongs to the category of optoelectronic devices.
Use
It is commonly used for detecting the presence or absence of an object by utilizing an infrared light-emitting diode and a phototransistor.
Characteristics
- Utilizes infrared light for detection
- Compact size
- High sensitivity
- Reliable performance
Package
The H21A2 is typically available in a compact, through-hole package.
Essence
The essence of the H21A2 lies in its ability to accurately detect the presence of objects using infrared light.
Packaging/Quantity
The H21A2 is usually packaged individually and is available in varying quantities depending on the supplier.
Specifications
- Emitter Type: Infrared LED
- Detector Type: NPN Phototransistor
- Peak Wavelength: 950 nm
- Collector-Emitter Voltage (VCEO): 30 V
- Emitter-Collector Voltage (VECO): 5 V
- Collector Current (IC): 50 mA
- Power Dissipation (PD): 100 mW
- Operating Temperature Range: -40°C to +85°C
Detailed Pin Configuration
The H21A2 typically consists of three pins: 1. Emitter (E) 2. Collector (C) 3. Base (B)
Functional Features
The H21A2 operates by emitting infrared light from the LED, which is then detected by the phototransistor. When an object is present, the infrared light is reflected back to the phototransistor, causing it to conduct and produce an output signal.
Advantages and Disadvantages
Advantages
- High sensitivity to infrared light
- Compact size allows for versatile integration
- Reliable detection capabilities
Disadvantages
- Susceptible to ambient light interference
- Limited range of detection
Working Principles
The working principle of the H21A2 is based on the reflection of infrared light. When an object is within the detection range, the emitted light reflects off the object and is detected by the phototransistor, resulting in a change in its conductivity and the generation of an output signal.
Detailed Application Field Plans
The H21A2 finds applications in various fields, including: - Object detection in automated systems - Proximity sensing in robotics - Position sensing in industrial equipment - Motion detection in security systems
Detailed and Complete Alternative Models
Some alternative models to the H21A2 include: - H21A1: Similar functionality with different specifications - H21A3: Enhanced sensitivity and wider detection range - H21A4: Higher power dissipation and extended temperature range
In conclusion, the H21A2 optical switch offers reliable object detection capabilities through the use of infrared light and phototransistor technology. Its compact size and high sensitivity make it suitable for a wide range of applications in automation, robotics, and industrial systems.
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Énumérez 10 questions et réponses courantes liées à l'application de H21A2 dans les solutions techniques
What is the H21A2 sensor used for?
- The H21A2 sensor is commonly used for detecting the presence or absence of an object, as well as for position sensing in various technical solutions.
How does the H21A2 sensor work?
- The H21A2 sensor works based on the principle of reflective optointerrupter, where it emits infrared light and detects the reflected light to determine the presence or absence of an object.
What are the typical applications of the H21A2 sensor?
- The H21A2 sensor is often used in applications such as proximity sensing, object detection, line following robots, and position sensing in industrial automation.
What is the operating voltage range for the H21A2 sensor?
- The H21A2 sensor typically operates within a voltage range of 4.5V to 5.5V.
Can the H21A2 sensor be used in harsh environments?
- The H21A2 sensor is not designed for harsh environments and may require additional protection if used in dusty, humid, or corrosive conditions.
What is the typical response time of the H21A2 sensor?
- The H21A2 sensor has a fast response time, typically in the range of microseconds, making it suitable for high-speed applications.
Does the H21A2 sensor require calibration?
- The H21A2 sensor does not typically require calibration, but proper alignment and setup are necessary for accurate operation.
Can the H21A2 sensor distinguish between different types of objects?
- The H21A2 sensor can distinguish between objects based on their reflectivity, but it may not be able to differentiate between specific types of objects.
What are the limitations of the H21A2 sensor?
- The H21A2 sensor may have limitations in detecting transparent or highly reflective objects, and its performance can be affected by ambient light.
Is the H21A2 sensor compatible with microcontrollers and digital systems?
- Yes, the H21A2 sensor can be easily interfaced with microcontrollers and digital systems using its output signal, making it suitable for integration into various technical solutions.