4N28TM

Overview

The onsemi 4N28TM is a transistor output optocoupler housed in a 6-pin DIP package. It features an infrared emitting diode coupled to a phototransistor, providing electrical isolation with a high isolation voltage rating of 4170 Vrms. The device is designed for general-purpose applications requiring reliable signal transmission across isolated circuits.

Feature Summary

• Provides galvanic isolation between input and output circuits
• Integrates an infrared LED emitter with a phototransistor detector
• Offers high isolation voltage capability for safety compliance

Applications

• General purpose signal isolation
• Industrial control systems
• Computer peripheral interfaces

Procurement Notes

Verify the specific suffix 'TM' against the official datasheet to confirm packaging and tape/reel specifications. Ensure the component matches the required isolation voltage and current transfer ratio for the target design. Confirm RoHS compliance status as per the latest manufacturer documentation before finalizing procurement orders.

Selection Notes

Select this component when a standard transistor output optocoupler is required for basic isolation tasks. Consider the CTR range and propagation delay if timing sensitivity is critical. Verify that the 6-DIP package fits the PCB layout constraints and that the isolation voltage meets the system safety requirements.

Part Context

This part belongs to the broader family of transistor output optocouplers from onsemi. It shares functional similarities with other models in the series but is distinguished by its specific pinout and packaging configuration. The device serves as a fundamental building block for isolating low-voltage control signals from higher-voltage loads.

Replacement Considerations

Check for direct replacements such as the 4N28SM or 4N28SR2VM, ensuring pin compatibility and electrical parameter equivalence. Verify that any substitute maintains the same isolation voltage rating and package type to avoid redesigning the host circuit board.