The KPC817S-D is a single-channel phototransistor optocoupler manufactured by KEC. This device consists of an infrared light-emitting diode (LED) optically coupled to a phototransistor. It is designed for electrical isolation between input and output circuits, offering a high degree of insulation and reliable signal transfer.

Applications

• Programmable Logic Controllers (PLCs): Used for isolating input/output modules.
• Microprocessor Input/Output Isolation: Protects microprocessors from voltage spikes and noise.
• Computer Peripheral Interface: Provides isolation in interfaces like USB or serial communication.
• Noise Suppression in Switching Circuits: Reduces noise coupling between circuits.
• Signal Transmission between Circuits of Different Potentials and Impedances: Enables safe and reliable signal transfer.

Features

• High Isolation Voltage: Offers significant electrical isolation between the input and output, typically up to 5000 Vrms.
• Compact Package: Available in a small outline package (SOP) for space-saving designs.
• CTR (Current Transfer Ratio): Specified CTR ensures efficient signal transfer.
• Low Saturation Voltage: Provides efficient switching performance.
• RoHS Compliant: Environmentally friendly, adhering to RoHS standards.

Benefits

• Enhanced System Reliability: Prevents damage from overvoltage and transients.
• Improved Signal Integrity: Reduces noise and interference in signal transmission.
• Safety and Protection: Protects operators and equipment from high voltage hazards.
• Compact Design: Facilitates integration into space-constrained applications.
• Cost-Effective Solution: Provides reliable isolation at a reasonable cost.

Additional Details

The KPC817S-D features a collector-emitter voltage (VCEO) of typically 80V and a forward current (IF) of 50mA. The operating temperature ranges from -30°C to +100°C. The current transfer ratio (CTR) varies depending on the specific grade (e.g., A, B, C, D) and is an important parameter to consider when selecting the appropriate optocoupler for a given application. Careful consideration of the forward voltage, collector current, and power dissipation is necessary to ensure proper and reliable operation. The device's insulation resistance is also very high, typically 10^11 ohms.