EL817S

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EL817S

Transistor Output Optocouplers Photo-Coupler

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Description

The EL817S is an optocoupler, specifically a phototransistor optocoupler, designed to provide electrical isolation between its input and output while allowing signal transmission. It typically consists of a light-emitting diode (LED) on the input side and a phototransistor on the output side. When a current flows through the LED, it emits light, which is detected by the phototransistor, allowing current to flow in the output circuit.
Key features of the EL817S include a high isolation voltage (up to 5 kV), fast switching speed, and low input current requirements, making it suitable for a variety of applications, including signal isolation, data communication, and interfacing between different voltage levels. Its compact package and reliable performance make it a popular choice in industrial, consumer electronics, and telecommunications systems. The EL817S is also available in different configurations, offering flexibility in design for engineers.

Features

The EL817S is an optoisolator, commonly used for signal isolation in electronic circuits. Key features include:
1. Isolated Output: Provides electrical isolation between input and output, ensuring safety and noise reduction.
2. High-Speed Switching: Capable of switching speeds up to 15 kHz, making it suitable for fast signal processing.
3. Wide Operating Voltage: Input can operate with a wide voltage range, typically from 1.2V to 6V for the LED.
4. Low Forward Current: Requires minimal input current (around 10 mA) for activation, enhancing energy efficiency.
5. Compact Package: Available in a small 4-pin DIP or surface-mount package, allowing for space-saving designs.
6. High Common Mode Rejection Ratio (CMR): Ensures effective noise reduction in high-voltage environments.
7. Gain-Bandwidth Product: Offers good linearity and bandwidth for analog applications.
These features make the EL817S suitable for applications in industrial automation, microcontroller interfacing, and data communication systems.

Package

The EL817S is typically packaged in a 4-pin DIP (Dual In-line Package) format. This package style allows for easy insertion into circuit boards and is commonly used in optocouplers for electrical isolation applications.

Pinout

The EL817S is an optocoupler (optical isolator) with a 4-pin configuration. The pin assignments and their functions are as follows:
1. Pin 1 (Anode): The anode of the internal LED. This pin connects to the positive voltage supply for the LED.
2. Pin 2 (Cathode): The cathode of the internal LED. This pin connects to the ground or negative voltage and is used to complete the LED circuit.
3. Pin 3 (Collector): The collector of the phototransistor. This pin connects to the positive supply voltage for the output side of the optocoupler.
4. Pin 4 (Emitter): The emitter of the phototransistor. This pin connects to ground or the negative voltage in the output circuit.
The EL817S provides electrical isolation between its input and output, making it suitable for applications such as signal transmission, isolation in power supplies, and interfacing between different voltage systems.

Manufacturer

The EL817S is manufactured by Sharp Corporation, a prominent Japanese company known for its diverse range of electronics and technology products. Founded in 1912, Sharp specializes in consumer electronics, including televisions, home appliances, and components like semiconductors and optoelectronics. The EL817S is an opto-isolator, which is used in various applications to provide electrical isolation between different parts of a circuit, enhancing safety and performance. Sharp is recognized for its innovation and quality in the electronics industry, making it a significant player in both consumer and industrial markets.

Application

The EL817S is an optocoupler used in various applications, including signal isolation, switching power supplies, data communication interfaces, and microcontroller interfacing. It provides electrical isolation between high and low voltage circuits, protects sensitive components from voltage spikes, and helps reduce noise in circuit designs. Its fast switching speed makes it suitable for high-frequency applications, while its compact size is advantageous for space-constrained designs.

Equivalent

The EL817S chip is an optocoupler, and its equivalent products include the PC817, MOC3063, and TLP-185. These components serve similar functions in isolating and transferring signals between different voltage levels while providing electrical isolation. Always verify specific electrical characteristics to ensure compatibility for your application.

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