HCPL-7851

Product Overview

Category: Optocoupler
Use: Isolation and signal transmission between high voltage and low voltage circuits
Characteristics: High isolation voltage, high speed, compact size
Package: DIP-8 (Dual Inline Package)
Essence: Optoelectronic device for electrical isolation
Packaging/Quantity: Tape and reel, 1000 pieces per reel

Specifications

• Isolation Voltage: 5000 Vrms
• Input Current: 10 mA
• Output Voltage: 5 V
• Output Current: 50 mA
• Propagation Delay: 0.5 µs
• Rise Time: 0.3 µs
• Fall Time: 0.2 µs
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. Anode (Input)
2. Cathode (Input)
3. NC (No Connection)
4. Ground (Input)
5. Emitter (Output)
6. Collector (Output)
7. Base (Output)
8. NC (No Connection)

Functional Features

• Provides electrical isolation between input and output circuits
• Transmits signals between high voltage and low voltage circuits
• High-speed response for quick signal transmission
• Compact size allows for space-saving designs

Advantages

• High isolation voltage ensures safe operation in high voltage environments
• Fast propagation delay and rise/fall times enable efficient signal transmission
• Compact package saves board space in electronic designs

Disadvantages

• Limited output current may not be suitable for high-power applications
• No connection pins may limit flexibility in certain circuit designs

Working Principles

The HCPL-7851 is an optocoupler that utilizes a light-emitting diode (LED) and a phototransistor to achieve electrical isolation between input and output circuits. When a current is applied to the LED, it emits light that activates the phototransistor, allowing signal transmission from the input side to the output side.

Detailed Application Field Plans

The HCPL-7851 is commonly used in various applications where electrical isolation and signal transmission between high voltage and low voltage circuits are required. Some specific application fields include:

1. Power supply systems
2. Industrial automation
3. Motor control circuits
4. Medical equipment
5. Telecommunications

Detailed and Complete Alternative Models

1. HCPL-7800: Similar optocoupler with lower isolation voltage (2500 Vrms)
2. HCPL-7860: Optocoupler with higher output current capability (100 mA)
3. HCPL-7870: Optocoupler with extended temperature range (-40°C to +105°C)

Note: This is not an exhaustive list of alternative models, but provides examples of similar optocouplers with varying specifications.

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