TIL191BG

Overview

The TIL191BG is a single-channel optocoupler featuring an infrared LED and NPN silicon phototransistor. It provides 5300Vrms isolation voltage with a typical rise/fall time of 6µs. The device supports DC input, has a minimum current transfer ratio of 100% at 5mA input, and a collector-emitter breakdown voltage of at least 35V. Maximum collector dark current is 100nA.

Feature Summary

• High-density four-pin mounting configuration for space-constrained designs
• Single-channel optical isolation between input and output circuits
• NPN silicon phototransistor output for reliable signal switching

Applications

• General-purpose digital signal isolation
• Microprocessor interface circuits
• Solid-state relay driver applications

Procurement Notes

Verify the specific suffix (e.g., DG) against the required package variant. Confirm that the 4-pin DIP form factor matches the target PCB footprint. Ensure the 5300Vrms isolation rating meets system safety standards. Check that the 100% CTR minimum aligns with drive requirements.

Selection Notes

Select this component when high-density packaging is critical due to its four-pin layout. The 6µs switching speed suits moderate-frequency digital signals. Verify that the 35V collector-emitter breakdown voltage accommodates the load voltage. Ensure the 100% CTR minimum provides sufficient gain for the application logic levels.

Part Context

The TIL191BG belongs to Isocom’s family of transistor-output optocouplers. It utilizes standard NPN phototransistor technology for cost-effective isolation. The four-pin design distinguishes it from wider six-pin or surface-mount alternatives in the same product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.