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EL817C Optocoupler/Phototransistor IC - DIP-4 Package

SKU: X2EIWOE6XC
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The EL817C is a high-performance optocoupler (opto-isolator) that provides electrical isolation between input and output circuits using an infrared LED and a phototransistor housed within a single DIP-4 package. It enables signal transmission while preventing direct electrical connection, protecting sensitive electronic circuits from voltage spikes, noise, and ground loops. The EL817C is widely used in switching power supplies, microcontroller interfaces,...
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The EL817C is a high-performance optocoupler (opto-isolator) that provides electrical isolation between input and output circuits using an infrared LED and a phototransistor housed within a single DIP-4 package. It enables signal transmission while preventing direct electrical connection, protecting sensitive electronic circuits from voltage spikes, noise, and ground loops.

The EL817C is widely used in switching power supplies, microcontroller interfaces, industrial automation equipment, PLC systems, battery chargers, signal isolation circuits, and communication interfaces. Its compact size, high isolation voltage, and reliable performance make it one of the most commonly used optocouplers in electronic designs.

By isolating low-voltage control circuits from high-voltage power sections, the EL817C enhances system safety, reliability, and noise immunity.

Key Features

  • Infrared LED and phototransistor output
  • High electrical isolation between input and output
  • Compact DIP-4 package
  • High current transfer ratio (CTR)
  • Low power consumption
  • Fast switching response
  • Excellent noise immunity
  • High reliability and long lifespan
  • Suitable for signal isolation applications
  • Protects microcontrollers from high-voltage circuits
  • Compatible with digital and analog circuits
  • Easy PCB mounting
  • RoHS compliant
  • Widely used in power electronics and automation systems

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Component Type: Optocoupler / Optoisolator
Model: EL817C
Package Type: DIP-4
Output Type: Phototransistor
Isolation Method: Infrared Optical Coupling
Number of Channels: 1 Channel
Isolation Voltage: 5000Vrms Typical
Input LED Forward Voltage: 1.2V Typical
Input LED Forward Current: 50mA Maximum
Collector-Emitter Voltage (VCEO): 80V Maximum
Emitter-Collector Voltage (VECO): 6V Maximum
Collector Current (IC): 50mA Maximum
Current Transfer Ratio (CTR): 200% to 400% (Grade C)
Response Time: Approximately 4µs to 18µs
Power Dissipation: 200mW Typical
Operating Temperature Range: -30°C to +100°C
Storage Temperature Range: -55°C to +125°C
Mounting Type: Through-Hole
Pin Count: 4

Additional Resources

EL817C.PDF

FAQ

1. What is the EL817C optocoupler used for?

The EL817C is used to electrically isolate two circuits while allowing signals to be transferred safely between them.

2. How does the EL817C work?

It uses an internal infrared LED and phototransistor. When the LED is activated, the phototransistor conducts, transferring the signal without a direct electrical connection.

3. What is the isolation voltage of the EL817C?

The EL817C typically provides up to 5000Vrms isolation between the input and output circuits.

4. Can the EL817C be used with Arduino and ESP32 boards?

Yes, it is commonly used to isolate Arduino, ESP32, STM32, and other microcontrollers from high-voltage or noisy circuits.

5. Why is an optocoupler important in electronic circuits?

An optocoupler improves safety, protects sensitive components from voltage spikes and noise, and prevents ground loop issues by providing complete electrical isolation.

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