EL357N Optocoupler SOP-4 : Everlight Phototransistor Optocoupler

EL357N Optocoupler SOP-4 – Everlight Original

The EL357N is a compact phototransistor output optocoupler from Everlight, designed to provide electrical isolation between input and output circuits while ensuring reliable signal transmission. Packaged in a space-saving SOP-4 surface mount package, it is widely used in switch mode power supplies (SMPS), industrial control systems, microcontroller interfaces, and communication circuits. The EL357N offers high isolation voltage, low power consumption, and dependable long-term performance.

Specifications:

• Manufacturer: Everlight
• Model: EL357N
• Device Type: Phototransistor Optocoupler
• Package: SOP-4
• Mounting Type: Surface Mount (SMD)
• Isolation Voltage: 5kVrms (Typical)
• Forward LED Voltage (VF): 1.2V (Typical)
• Collector-Emitter Voltage (VCEO): 80V
• Current Transfer Ratio (CTR): 50% to 600% (Depending on Rank)
• Operating Temperature: -55°C to +110°C

Key features and benefits:

• Original Everlight optocoupler
• Phototransistor output
• High isolation voltage between input and output
• Compact SOP-4 surface mount package
• Low input current requirement
• Suitable for high-speed signal isolation and feedback applications

Applications:

• SMPS feedback circuits
• AC-DC power supplies
• Microcontroller signal isolation
• Industrial automation equipment
• PLC input and output isolation
• Signal switching circuits
• Communication interfaces
• Battery chargers and adapters

Package Dimensions:

• Package Dimensions
• Body Length: 4.40 mm (Typical)
• Body Width: 4.10 ± 0.20 mm
• Overall Length (Lead to Lead): 7.00 ± 0.30 mm
• Package Height: 2.0 mm (Max)
• Lead Pitch: 2.54 mm (Typical)
• Lead Width: 0.40 ± 0.10 mm
• Lead Thickness: 0.20 mm (Typical)

Frequently Asked Questions:

Q: Is the EL357N compatible with PC817 optocouplers?
A: In many applications, yes. However, always verify the package, CTR rank, pin configuration, and electrical specifications before replacement.

Q: Can I use this optocoupler in SMPS feedback circuits?
A: Yes, the EL357N is commonly used in SMPS and power supply feedback circuits.

Q: Is this an original Everlight component?
A: Yes, this product is supplied as an original Everlight optocoupler.

Q: Does this IC provide electrical isolation between circuits?
A: Yes, it electrically isolates the input and output while transferring the control signal through an internal LED and phototransistor.

Q: Is the EL357N suitable for Arduino or microcontroller isolation?
A: Yes, it is widely used to isolate GPIO signals and protect microcontrollers from high-voltage circuits.

Q: Can this optocoupler be used in industrial control systems?
A: Yes, it is suitable for PLCs, automation equipment, relay interfaces, and industrial signal isolation.

Q: Is this a surface mount device?
A: Yes, the EL357N comes in a compact SOP-4 SMD package suitable for automated PCB assembly.

Q: What should I check before replacing an existing optocoupler?
A: Verify the package type, pin configuration, isolation rating, CTR grade, and operating specifications to ensure compatibility with your circuit.

Package Includes:

*Image shown is a representation only.

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