Parameters of Optical Coupler 357
The 357 series optical coupler is a 4-pin phototransistor optocoupler with an isolation voltage of up to 3750–3700 V RMS, designed for low-voltage signal isolation.
Key Specifications
- Type: Phototransistor optocoupler (LED input, NPN phototransistor output) ( )
- Package: SOP-4 (Small Outline Package, 4 pins) ( )
- Number of Channels: 1 channel ( )
- Input LED Forward Voltage (Vf): Typically around 1.2–1.4 V at 10–20 mA forward current ( )
- Input Forward Current (If): Maximum 50 mA, typical operation 10–20 mA ( )
- Output Collector-Emitter Voltage (Vce): Maximum 35–80 V depending on model ( )
- Current Transfer Ratio (CTR): Typically 50–600% depending on operating conditions ( )
- Isolation Voltage: Up to 3750 V RMS (EL357) or 3.7 kV (PC357) between input and output ( )
- Operating Temperature Range: -55°C to +100°C ( )
- Storage Temperature Range: -55°C to +125°C ( )
- Switching Time: Rise time ~3 µs, fall time ~3 µs typical ( )
Pin Configuration (SOP-4)
- Pin 1: Anode of LED
- Pin 2: Cathode of LED
- Pin 3: Collector of phototransistor
- Pin 4: Emitter of phototransistor ( )
Applications
- Electrical isolation between low-voltage control circuits and high-voltage loads
- Signal transfer in microcontroller interfaces
- Switching and protection circuits
- Replacement for PC817 optocoupler in low-voltage applications ( )
Notes
- The 357 series is designed for general electronic equipment; for safety-critical or high-reliability applications, written approval from the manufacturer is recommended ( ).
- Proper usage within datasheet limits is essential to prevent damage to insulation or device failure ( ). This comprehensive overview provides the main electrical, mechanical, and operational parameters of the 357 series optical coupler, suitable for circuit design and component selection.
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