TIL117

Overview

The TIL117 is a six-pin DIP phototransistor optocoupler manufactured by Texas Instruments. It features an infrared-emitting diode optically coupled to a high-gain phototransistor, providing electrical isolation between input and output circuits. The device is designed for compatibility with standard TTL integrated circuits, ensuring reliable signal transmission across isolated boundaries in digital logic applications.

Feature Summary

• Provides galvanic isolation via optical coupling between input and output stages
• High gain phototransistor output stage for efficient signal transfer
• Compatible with standard TTL logic families for direct interface

Applications

• Digital signal isolation in microcontroller systems
• TTL-compatible logic interface circuits
• General-purpose optoisolation for data transmission

Procurement Notes

Verify the manufacturer source carefully as multiple vendors produce this component. Confirm the package type matches your PCB footprint requirements. Check datasheet specifications for current transfer ratio and isolation voltage ratings relevant to your specific circuit design needs before procurement.

Selection Notes

Select this component when TTL compatibility and standard DIP packaging are required. Ensure the isolation voltage rating meets system safety standards. Consider the current transfer ratio if driving specific load currents is critical for the application performance.

Part Context

The TIL117 belongs to the family of general-purpose phototransistor optocouplers. It serves as a cost-effective solution for basic isolation tasks where high speed or complex functionality is not required. Its widespread availability makes it a common choice for legacy and simple digital isolation designs.

Replacement Considerations

Equivalent parts include the 4N25 and 4N26 from various manufacturers. Verify pinout compatibility and electrical parameters such as CTR and isolation voltage when substituting to ensure circuit functionality remains intact.