4N25TM

Overview

The 4N25TM is a single-channel optoisolator featuring an infrared-emitting GaAs LED coupled to a silicon NPN phototransistor detector. It provides electrical isolation with a high breakdown voltage rating of 7,500 Vrms between input and output circuits. The device utilizes a standard 6-pin DIP package, facilitating through-hole mounting on printed circuit boards. Designed for robust signal transmission across isolated barriers, it supports digital logic interfacing and general-purpose switching applications in environments requiring reliable galvanic separation.

Feature Summary

• Integrated infrared emitter paired with silicon NPN phototransistor for efficient optical coupling
• High dielectric isolation strength ensuring safe operation across distinct voltage domains
• Standardized six-lead dual-in-line package configuration for straightforward PCB integration

Applications

• Industrial control systems requiring signal isolation
• Computer peripheral interface circuits
• General-purpose switching applications

Procurement Notes

Verify the specific suffix 'TM' against official manufacturer documentation to confirm exact binning or testing criteria. Ensure compatibility with existing footprint designs. Confirm lead-free status if required by project specifications. Cross-reference datasheet revisions to validate parameter consistency before finalizing procurement orders.

Selection Notes

Select this component when high-voltage isolation is critical for system safety. Evaluate the current transfer ratio requirements against load constraints. Consider the propagation delay characteristics for timing-sensitive digital signals. Verify that the package dimensions align with available board space and assembly equipment capabilities.

Part Context

This part belongs to the family of discrete optocouplers manufactured by onsemi. These devices are engineered to provide reliable electrical isolation between low-voltage control circuits and higher-voltage power stages. The product line supports various industrial and consumer electronics applications where noise immunity and safety compliance are paramount design considerations.

Replacement Considerations

Consult official substitution guides for compatible alternatives. Verify pinout compatibility and electrical parameter equivalence before swapping components. Ensure replacement parts meet the same isolation voltage ratings and package form factors.