Q817CST1

Overview

The Q817CST1 is a single-channel optoisolator manufactured by QT Brightek (QTB). It features a DC input driving a transistor output, housed in a 4-SMD gull-wing package. The device provides an isolation voltage of 5000Vrms and operates within a temperature range of -55°C to 110°C. Key electrical parameters include a maximum forward current of 60mA, a typical forward voltage of 1.24V, and a collector-emitter saturation voltage of 200mV. The output can withstand up to 35V and deliver 50mA per channel. Current transfer ratios range from 200% to 400% at 5mA input, with rise and fall times of 6µs and 8µs respectively.

Feature Summary

• Provides high-voltage galvanic isolation between input and output circuits
• Utilizes a surface-mount 4-SMD gull-wing package for automated assembly
• Features a phototransistor output stage for digital signal transmission
• Designed for operation across extended industrial temperature ranges

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops
• Microcontroller interface circuits
• Communication equipment isolation barriers

Procurement Notes

Verify the specific suffix CST1 against the manufacturer's datasheet to confirm pinout and packaging configuration. Ensure compatibility with RoHS3 standards if required by your design specifications. Cross-reference the DigiKey part numbers 1516-1384-2-ND or 1516-1384-1-ND for accurate ordering details and availability status. Confirm lead times directly with authorized distributors as manufacturing schedules may vary.

Selection Notes

Select this component when a single-channel transistor output isolator is needed with a 5000Vrms isolation rating. Consider the 4-SMD package size for space-constrained PCB layouts. Evaluate the 200-400% current transfer ratio at 5mA to ensure sufficient gain for your logic levels. Verify that the 35V output voltage rating meets the downstream circuit requirements.

Part Context

This component belongs to the Q817 series of optocouplers produced by QT Brightek. The series typically includes variants with different output types and packaging options. The Q817CST1 specifically denotes the transistor output version in the SMD gull-wing form factor. This family is designed for general-purpose isolation applications in consumer and industrial electronics.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source data. Consult the manufacturer's official replacement guide or distributor cross-reference tools for verified alternatives.