Q817

Overview

The Q817C is a single-channel optoisolator from the Q817 series manufactured by QT Brightek. It features a transistor output with a maximum collector-emitter voltage of 35V and a peak forward current of 60 mA. The device provides an isolation voltage of 5000Vrms and operates within a temperature range of -55°C to 110°C. Typical current transfer ratios range from 200% to 400% at 5mA input, with rise and fall times of 6µs and 8µs respectively. It is housed in a standard 4-DIP package.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes a transistor output stage for digital signal switching applications
• Designed for through-hole mounting in standard DIP configurations

Applications

• General-purpose digital signal isolation
• Microcontroller interface circuits
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix (e.g., C) against the required datasheet specifications, as variations may exist within the Q817 family. Confirm that the 4-DIP package dimensions align with the target PCB footprint. Ensure the operating temperature range meets the environmental requirements of the final assembly. Check RoHS compliance status if restricted substances are prohibited in the manufacturing process.

Selection Notes

Select this component when a robust, cost-effective solution for galvanic isolation is required. The wide operating temperature range supports demanding industrial environments. The transistor output type is suitable for interfacing with logic-level inputs. Consider the current transfer ratio requirements to ensure adequate noise immunity and signal integrity across the isolation barrier during operation.

Part Context

The Q817 belongs to a widely recognized family of general-purpose optocouplers. These devices are commonly used in various electronic systems requiring safety isolation. The manufacturer produces multiple variants within this series, differentiated by packaging or specific electrical characteristics. This part represents a standard configuration within the broader product line.

Replacement Considerations

Compatible substitutes include the PC817, LTV-817, and SFH617A series. Verify pinout compatibility and electrical parameters such as isolation voltage and current transfer ratio before substitution. Ensure the replacement device matches the required package style and thermal performance specifications.