4N25SD

Overview

The onsemi 4N25SD is a single-channel phototransistor output optocoupler housed in a 6-SMD, Gull Wing package. It provides electrical isolation with a rated voltage of 5300 Vrms. The device features a DC input and logic output configuration. Key electrical parameters include a maximum forward voltage of 1.5V, a minimum current transfer ratio of 20%, and typical rise and fall times of 2μs. It operates within a temperature range of -40°C to 100°C.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes a phototransistor output with an accessible base terminal for signal control
• Designed for compact surface-mount integration

Applications

• High-voltage isolation applications
• Signal transmission across isolated boundaries
• General-purpose digital isolation

Procurement Notes

Verify the specific suffix 'SD' against official datasheets to confirm the SMD gull-wing package variant. Ensure compatibility with surface-mount assembly processes. Confirm that the 5300 Vrms isolation rating meets system safety requirements. Check for any specific handling instructions related to the surface-mount form factor.

Selection Notes

Select this component when a surface-mount phototransistor optocoupler with high isolation voltage is required. The accessible base pin allows for external biasing or speed adjustment. Compare the 2μs switching speed against application timing needs. Verify that the 6-SMD footprint fits the PCB layout constraints.

Part Context

The 4N25SD belongs to the 4N25 series of optocouplers from onsemi. While the standard 4N25 typically uses a DIP-6 package, the SD suffix denotes the surface-mount variant. This series is widely recognized for general-purpose isolation tasks. The SD version maintains the core electrical characteristics of the through-hole counterpart while adapting to modern assembly methods.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source data.