PC817 optical isolator photocoupler
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The PC817 is an optocoupler or photocoupler that integrates an infrared LED and a phototransistor within a single package. It provides electrical isolation between input and output, making it ideal for isolating high-voltage circuits from low-voltage control systems. The PC817 is commonly used in power supply circuits, microcontroller interfaces, and signal isolation applications.
Key Features:
- High isolation voltage: 5000 Vrms
- Compact 4-pin DIP package
- High collector-emitter voltage: 80V (max)
- Current transfer ratio (CTR): 50% to 600%
- Low input current: 1.2 mA (typical)
- Wide operating temperature range: -30°C to +100°C
- RoHS compliant
- Input Forward Voltage (VF): 1.2V (typical)
- Input Current (IF): 20mA (max)
- Collector-Emitter Voltage (VCEO): 80V (max)
- Collector Current (IC): 50mA (max)
- Isolation Voltage: 5000 Vrms
- Current Transfer Ratio (CTR): 50% to 600%
- Response Time (Rise/Fall Time): 3µs (typical)
- Operating Temperature Range: -30°C to +100°C
- Package: 4-pin DIP
- Power Supply Circuits: Isolates feedback signals in switching power supplies.
- Microcontroller Interfaces: Provides electrical isolation between microcontrollers and high-voltage circuits.
- Signal Isolation: Ensures signal integrity by isolating input and output signals in communication systems.
- Industrial Control: Used in industrial automation for isolating control signals.
- Consumer Electronics: Integrated into electronic devices to isolate and protect sensitive components.
- Telecommunications: Ensures reliable signal transfer in telecom equipment.
Technical Specifications:
- Logic Family: CMOS
- Number of Channels: 3
- Switch Configuration: Single-Pole Double-Throw (SPDT)
- Supply Voltage Range: 3V to 15V
- “ON” Resistance (R_ON): 125Ω typical at V_DD = 10V
- “OFF” Leakage Current (I_OFF): ±100pA typical at V_DD = 10V
- Control Input Voltage (V_IH): 0.7 V_DD min, 0.3 V_DD max
- Maximum Operating Frequency: 40 MHz at V_DD = 10V
Applications:
- Signal routing and switching
- Analog and digital multiplexing
- Audio and video signal processing
- Data acquisition systems
- Test equipment