QT4502

Overview

The QT4502 is a single-channel optocoupler manufactured by QT Brightek (QTB), designed for electrical isolation in electronic circuits. It features a transistor output with a base connection, housed in an 8-DIP package suitable for through-hole mounting. The device provides a high isolation voltage of 5000Vrms between the input and output sections. Key electrical parameters include a maximum forward current of 25 mA, a typical forward voltage of 1.45 V, and a collector-emitter voltage rating of 20 V. The unit operates within a temperature range of -55°C to 100°C.

Feature Summary

• Provides robust electrical isolation with a 5000Vrms dielectric barrier between input and output circuits.
• Integrates a phototransistor output with a dedicated base terminal for enhanced switching control and speed.
• Supports wide operating temperatures ranging from -55°C to 100°C for reliable performance in diverse environments.

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops for voltage regulation
• Microcontroller interface circuits for noise immunity

Procurement Notes

Verify the specific datasheet version when ordering, as QT Brightek may update specifications over time. Confirm that the 8-DIP package dimensions match your PCB footprint requirements. Ensure that the 5000Vrms isolation rating meets the safety standards of your target application. Check the current transfer ratio specifications against your drive circuit capabilities to ensure proper switching performance.

Selection Notes

Select the QT4502 when high isolation voltage and fast switching are required in a through-hole package. The integrated base allows for faster turn-off times compared to standard phototransistors. Consider the 20V collector voltage limit when designing the output circuit. Verify compatibility with your logic levels and current requirements before finalizing the design.

Part Context

The QT4502 belongs to the Optocoupler series from QT Brightek, which focuses on providing reliable isolation solutions for various electronic applications. This component is part of a broader lineup that includes different output types and packaging options. It serves as a critical interface element in systems where galvanic isolation is necessary to protect sensitive components from high voltages or noise.

FAQ

What is the typical turn-on and turn-off time for the QT4502?

The typical turn-on and turn-off times for the QT4502 are both 350ns.

Does the QT4502 have a base connection?

Yes, the QT4502 features a transistor output with a base connection, which can be used to improve switching speed.