TIL118

Overview

The TIL118 is a transistor output optocoupler manufactured by Texas Instruments. It provides electrical isolation between input and output circuits using an infrared LED and a phototransistor detector. The device offers high isolation voltage capabilities, making it suitable for applications requiring signal transmission across isolated domains while maintaining safety standards.

Feature Summary

• Transistor output configuration for digital switching applications
• High isolation voltage rating for circuit protection
• Compact package design for space-constrained layouts

Applications

• General purpose digital isolation
• Microprocessor system interface
• Solid state relay control

Procurement Notes

Verify the specific suffix variant (e.g., TIL118-1 or TIL118-2) against your design requirements, as performance characteristics may differ between versions. Confirm RoHS compliance status and lead times directly with authorized distributors. Ensure storage conditions meet manufacturer specifications to maintain device integrity prior to assembly.

Selection Notes

Select this component when a simple, cost-effective isolation solution is required for low-speed digital signals. Consider the CTR (Current Transfer Ratio) limits and saturation voltage requirements of your load. Evaluate thermal management needs if operating at high duty cycles or elevated ambient temperatures.

Part Context

The TIL118 belongs to Texas Instruments' family of optical isolators. It serves as a foundational component for galvanic isolation in industrial and consumer electronics. Its design prioritizes reliability and ease of integration into standard PCB footprints common in legacy and modern systems.

Replacement Considerations

Fairchild Semiconductor offers equivalent parts such as the FOD118 series. Verify pinout compatibility and electrical parameters before substitution. Check for any mechanical dimension differences that might affect enclosure fit.