ON Semiconductor
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H21A3
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H21A3 Optical Switch

Product Overview

The H21A3 optical switch belongs to the category of optoelectronic devices and is commonly used for sensing and control applications. Its characteristics include high sensitivity, fast response time, and reliable performance. The package typically consists of a housing with an integrated infrared emitter and phototransistor, encapsulated in an opaque epoxy resin. The essence of the H21A3 lies in its ability to detect the presence or absence of an object by sensing the interruption of the emitted infrared light. It is usually available in standard packaging with varying quantities per unit.

Specifications

  • Emitter Wavelength: 950 nm
  • Detector Type: Phototransistor
  • Operating Voltage: 5V
  • Operating Temperature Range: -40°C to 85°C
  • Response Time: 15 µs

Detailed Pin Configuration

The H21A3 typically features a 4-pin configuration: 1. Anode of Emitter 2. Cathode of Emitter 3. Collector of Detector 4. Emitter of Detector

Functional Features

The H21A3 operates on the principle of infrared light transmission and reception. When the infrared emitter is powered, it emits light towards the phototransistor. If an object is present between the emitter and detector, the received light is interrupted, causing the phototransistor to switch from a conducting state to a non-conducting state, thereby indicating the presence of the object.

Advantages and Disadvantages

Advantages

  • High sensitivity
  • Fast response time
  • Reliable performance
  • Compact design

Disadvantages

  • Susceptible to ambient light interference
  • Limited range of detection

Working Principles

The working principle of the H21A3 is based on the interruption of infrared light. When the emitted light is obstructed by an object, the phototransistor's conductivity changes, allowing it to be utilized for object detection and position sensing applications.

Detailed Application Field Plans

The H21A3 finds extensive use in various applications, including: - Object detection in automated systems - Position sensing in robotics - Proximity sensing in consumer electronics - Reflective sensors in industrial equipment

Detailed and Complete Alternative Models

Some alternative models to the H21A3 include: - H21A1: Similar specifications with different package dimensions - H21A2: Enhanced sensitivity and wider temperature range - H21A4: Higher power handling capability and improved noise immunity

In conclusion, the H21A3 optical switch offers reliable performance and is widely used in sensing and control applications due to its high sensitivity and fast response time. While it has certain limitations, its functional features make it a valuable component in various electronic and industrial systems.

Word Count: 386

Перелічіть 10 типових запитань і відповідей, пов’язаних із застосуванням H21A3 у технічних рішеннях

  1. What is the H21A3 sensor used for?

    • The H21A3 sensor is commonly used for detecting the presence or absence of an object, as well as for position sensing in various technical solutions.

  2. What is the operating voltage range of the H21A3 sensor?

    • The operating voltage range of the H21A3 sensor is typically between 4.5V and 5.5V.

  3. How does the H21A3 sensor work?

    • The H21A3 sensor operates using an infrared LED and a phototransistor to detect the presence or absence of an object based on the reflection of the emitted infrared light.

  4. What is the typical response time of the H21A3 sensor?

    • The typical response time of the H21A3 sensor is around 15 microseconds.

  5. Can the H21A3 sensor be used for proximity sensing?

    • Yes, the H21A3 sensor can be used for proximity sensing applications within its specified range.

  6. What is the recommended operating temperature range for the H21A3 sensor?

    • The recommended operating temperature range for the H21A3 sensor is usually between -25°C to 85°C.

  7. Is the H21A3 sensor suitable for use in harsh environments?

    • The H21A3 sensor is not specifically designed for harsh environments, so additional protection may be required for such applications.

  8. What is the typical output of the H21A3 sensor?

    • The typical output of the H21A3 sensor is a digital signal that indicates the presence or absence of the detected object.

  9. Can the H21A3 sensor be used in industrial automation applications?

    • Yes, the H21A3 sensor can be utilized in industrial automation for tasks such as object detection and position sensing.

  10. Are there any specific precautions to consider when using the H21A3 sensor?

    • It's important to avoid exposing the H21A3 sensor to direct sunlight or other intense light sources, as this can affect its performance. Additionally, proper shielding from ambient light may be necessary for accurate operation.