SFH618A-3

Overview

The SFH618A-3 is a single-channel optically coupled isolator featuring an infrared LED and NPN silicon phototransistor in a DIP-4 package. It offers a minimum isolation voltage of 5300 Vrms and a peak voltage of 7.5 kV. The device supports a maximum forward current of ±50 mA with a typical forward voltage of 1.65 V. Current transfer ratios range from 100% to 320%, while rise and fall times are typically 4 µs and 3 µs, respectively.

Feature Summary

• High isolation voltage capability for safe signal transmission between systems of different potentials
• Low input current operation reduces power consumption in the driving circuit
• High current transfer ratio ensures efficient signal coupling across the isolation barrier

Applications

• Computer terminals
• Industrial systems controllers
• Measuring instruments

Procurement Notes

Verify that the ordering suffix matches the required lead spread or packaging format. Confirm compliance with UL recognition file E91231 and pending VDE 0884 approval if specific regulatory standards are mandatory for the target application environment.

Selection Notes

Select this component when high isolation voltage and low input current are critical design constraints. Ensure the NPN phototransistor output configuration aligns with the receiving circuit requirements. Verify that the DIP-4 package dimensions fit the available PCB layout space.

Part Context

This part belongs to the SFH618A series, which includes variants like SFH618A-2 and SFH618A-4. These devices share the same core architecture of an infrared LED paired with an NPN silicon phototransistor. The series is designed for space-efficient dual in-line plastic packages suitable through-hole mounting.

Replacement Considerations

SFH618A-2G and SFH618A-4G are documented variants within the same family offering similar electrical characteristics.