Overview
The ORPC817B is a general-purpose optocoupler designed to provide electrical isolation between circuits while transmitting signals via infrared light. It consists of a GaAs infrared LED and a silicon phototransistor housed in a standard DIP-4 package. Commonly used in power supplies, industrial controls, and consumer electronics, this optocoupler ensures safety by preventing high-voltage surges from damaging low-voltage components. Its compatibility with automated assembly processes makes it a cost-effective choice for mass production.
Structure and Working Principle
The ORPC817B integrates an emitter (LED) and a detector (phototransistor) within a light-sealed enclosure. When current flows through the LED, it emits infrared light, which activates the phototransistor, creating a conductive path. This optical coupling mechanism eliminates ground loops and suppresses electromagnetic interference (EMI). The device typically operates at a forward current of 5–20 mA for the LED, with a collector-emitter voltage of up to 35 V for the output side.
Key Features
The ORPC817B offers an isolation voltage of 5,000 Vrms, making it suitable for high-voltage applications. Its compact DIP-4 package adheres to industry standards for easy integration. Other notable features include a typical Current Transfer Ratio (CTR) of 50–600% at 5 mA IF, ensuring efficient signal transmission. The device also exhibits low power consumption and a response time of approximately 4 μs.
Application Areas
Primary applications include feedback circuits in switched-mode power supplies (SMPS), where it isolates control and output stages. It’s also used in PLCs, inverters, and telecommunications equipment. In consumer electronics, the ORPC817B safeguards microcontrollers from high-voltage peripherals. Industrial automation systems leverage its EMI resistance for reliable signal transmission in noisy environments.
Maintenance and Precautions
To ensure longevity, operate within specified temperature ranges (–30°C to +100°C) and avoid reverse voltage on the LED. Excessive forward current can degrade the emitter over time. During soldering, follow JEDEC standards (e.g., 260°C max for 10 seconds) to prevent package damage. Storage in anti-static bags is recommended to avoid electrostatic discharge (ESD) risks.
B2B Procurement Guide
When sourcing ORPC817B, prioritize suppliers with ISO 9001 certification to guarantee quality consistency. Bulk purchases (1,000+ units) often reduce costs by 15–30%. Verify datasheet parameters like CTR and response time match your requirements. For critical applications, request batch testing reports. Lead times vary; reputable distributors typically stock this item for immediate shipment.
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