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H21A1 Phototransistor Optocoupler
Product Overview
Category
The H21A1 belongs to the category of optocouplers, also known as opto-isolators.
Use
It is commonly used for signal isolation, voltage level shifting, and noise reduction in electronic circuits.
Characteristics
- High isolation voltage
- Fast response time
- Compact package
- Wide operating temperature range
Package
The H21A1 is typically available in a hermetically sealed TO-46 package.
Essence
The essence of the H21A1 is its ability to provide electrical isolation between input and output circuits while allowing the transmission of signals through light.
Packaging/Quantity
It is usually packaged individually or in reels, with quantities varying based on manufacturer specifications.
Specifications
- Isolation Voltage: 7500 Vrms
- Collector-Emitter Voltage: 30 V
- Collector Current: 50 mA
- Power Dissipation: 100 mW
- Operating Temperature Range: -55°C to 100°C
Detailed Pin Configuration
The H21A1 has a standard 4-pin configuration: 1. Anode (A) 2. Cathode (K) 3. Emitter (E) 4. Collector (C)
Functional Features
- Phototransistor output
- High current transfer ratio
- Low input current requirement
- High-speed response
Advantages
- Electrical isolation
- Compact size
- Wide operating temperature range
- High isolation voltage
Disadvantages
- Limited collector-emitter voltage
- Sensitivity to ambient light
Working Principles
The H21A1 operates based on the principle of light-induced conductivity in the phototransistor. When light is applied to the base of the phototransistor, it allows current to flow from the collector to the emitter, providing an isolated output signal.
Detailed Application Field Plans
The H21A1 is widely used in the following applications: - Signal isolation in industrial control systems - Voltage level shifting in communication interfaces - Noise reduction in power electronics - Isolated feedback in switch-mode power supplies
Detailed and Complete Alternative Models
Some alternative models to the H21A1 include: - H11A1 - H22A1 - PC817
In conclusion, the H21A1 phototransistor optocoupler offers reliable electrical isolation and signal transmission capabilities, making it a versatile component in various electronic circuits and systems.
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Перечислите 10 распространенных вопросов и ответов, связанных с применением H21A1 в технических решениях.
What is H21A1?
- H21A1 is a phototransistor optocoupler that consists of a gallium arsenide infrared emitting diode and a silicon NPN phototransistor.
What are the typical applications of H21A1?
- H21A1 is commonly used in applications such as position sensors, encoders, industrial automation, and robotics for detecting objects or motion.
What is the operating voltage range for H21A1?
- The operating voltage range for H21A1 is typically between 4.5V to 16V.
What is the typical output current of H21A1?
- The typical output current of H21A1 is around 50µA.
How does H21A1 perform in different ambient light conditions?
- H21A1 has good ambient light rejection, making it suitable for use in various lighting environments.
What is the response time of H21A1?
- The response time of H21A1 is typically in the range of microseconds, allowing for fast detection and response to changes in the input signal.
Can H21A1 be used in harsh industrial environments?
- Yes, H21A1 is designed to withstand harsh industrial environments, including temperature variations and mechanical stress.
What are the key advantages of using H21A1 in technical solutions?
- Some key advantages of H21A1 include high sensitivity, compact size, low power consumption, and reliable performance.
Are there any specific precautions to consider when using H21A1?
- It's important to shield H21A1 from direct sunlight and other intense light sources to prevent false triggering and ensure accurate operation.
Where can I find detailed technical specifications and application notes for H21A1?
- Detailed technical specifications and application notes for H21A1 can be found in the manufacturer's datasheet and application guides, which are available on their official website or through authorized distributors.