FOD2743CTV

Overview

The FOD2743CTV is a transistor output optocoupler manufactured by onsemi. It features an infrared LED coupled to a phototransistor in an 8-DIP package with 0.400-inch lead spacing. The device provides electrical isolation with a rated insulation voltage of 5000 Vrms. Key electrical characteristics include a minimum current transfer ratio (CTR) of 50% and a collector-emitter breakdown voltage of at least 70 V. The component is designed for single-channel operation and complies with UL and VDE safety standards.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Integrates an infrared emitting diode with a silicon phototransistor
• Complies with international safety standards including UL recognition and VDE approval

Applications

• Error amplifier coupling in power supply feedback loops
• General-purpose signal isolation in industrial control systems
• Interface circuits requiring galvanic isolation between microcontrollers and high-voltage loads

Procurement Notes

Verify the specific suffix 'TV' indicates tape and reel packaging when ordering, as this differs from tube packaging variants. Confirm the manufacturer is onsemi or its predecessor Fairchild Semiconductor, as part numbers were transferred during corporate restructuring. Ensure the requested quantity matches the reel size specifications provided in the official datasheet to avoid partial reel issues.

Selection Notes

Select this component when a transistor output interface is required rather than a logic gate or photovoltaic output. The 5000 Vrms isolation rating makes it suitable for applications demanding robust safety barriers. Consider the 50% minimum CTR for drive circuit design to ensure reliable switching under varying temperature conditions and aging effects.

Part Context

This device belongs to the FOD2743 family of transistor output optocouplers. The family includes variants such as FOD2743C and FOD2743B, which share similar functional characteristics but may differ in packaging or testing criteria. The FOD2743 series is widely used in legacy and modern designs requiring cost-effective, high-isolation voltage solutions for signal transmission across isolated boundaries.

Replacement Considerations

Direct substitutes include other models within the FOD2743 series, such as FOD2743C or FOD2743B, provided the packaging and suffix requirements match. Verify that replacement parts maintain the same 5000 Vrms isolation rating and pinout configuration to ensure compatibility with existing PCB layouts and thermal management strategies.