4N28M

Overview

The Everlight Electronics Co Ltd 4N28M is a single-channel transistor output optocoupler housed in a 6-pin DIP package. It features an NPN phototransistor output with a base terminal for sensitivity control. The device provides high isolation voltage of 5000 Vrms between input and output, with a creepage distance exceeding 7.62 mm. Key electrical parameters include a collector-emitter breakdown voltage of 80 V minimum, a maximum forward current of 50 mA, and a typical current transfer ratio of 20%. Operating temperature ranges from -55 °C to +110 °C.

Feature Summary

• High isolation voltage capability of 5000 Vrms ensures safe signal transmission across potential barriers.
• Integrated base terminal on the phototransistor allows for adjustable sensitivity and faster switching response.
• Compact dual-in-line package design facilitates easy integration into standard PCB layouts.
• Compliant with RoHS standards and lead-free manufacturing processes.

Applications

• Power supply regulators
• Digital logic inputs
• Microprocessor inputs

Procurement Notes

Verify the specific suffix (e.g., TA) if tape-and-reel packaging is required, as standard versions may come in tubes. Confirm UL and VDE recognition numbers match your safety certification requirements. Ensure the operating temperature range meets your environmental specifications. Check for any regional distribution restrictions or end-of-life notices before finalizing procurement plans.

Selection Notes

Select this component when high isolation voltage and moderate speed are required for digital signal isolation. The presence of a base pin distinguishes it from similar models without base access, offering better control over switching characteristics. Consider the 6-pin DIP form factor for through-hole mounting applications where space constraints allow.

Part Context

The 4N28M belongs to the 4N2X series of transistor output optocouplers from Everlight. This series includes variants like the 4N25, 4N26, and 4N27, which share similar isolation and package characteristics but differ in current transfer ratio and switching speeds. The 4N28M is specifically designed for general-purpose isolation tasks requiring reliable performance.

Replacement Considerations

Compatible substitutes within the same family include the 4N25, 4N26, and 4N27. Verify that the replacement part's current transfer ratio and switching times meet the original circuit requirements. Ensure the pinout and package dimensions remain identical to avoid PCB redesign.