SFH618A-3SM

Overview

The SFH618A-3SM is a single-channel optoisolator featuring an infrared LED and NPN silicon phototransistor. It provides high isolation voltage of 5300Vrms and 7.5kV peak. The device offers low input current requirements of 0.5mA and high current transfer ratios ranging from 63% to 320% at 1mA, with a minimum of 32% at 0.5mA. It has a minimum collector-emitter breakdown voltage (BVCEO) of 55V. The component is housed in a surface-mount 4-SMD package.

Feature Summary

• Low input current requirement for efficient drive
• High current transfer ratio for signal integrity
• High isolation voltage capability
• Space-efficient surface-mount packaging

Applications

• Computer terminals
• Industrial systems controllers
• Measuring instruments
• Signal transmission between systems of different potentials and impedances

Procurement Notes

Verify the specific suffix 'SM' confirms the surface-mount package variant. Ensure compatibility with existing PCB footprints. Confirm RoHS compliance status if required by project specifications. Check for any pending VDE approvals if regulatory certification is mandatory for the end application.

Selection Notes

Select this component when low input current and high CTR are critical. Suitable for applications requiring robust galvanic isolation. Consider the surface-mount form factor for automated assembly. Verify that the 55V BVCEO meets the output circuit voltage requirements.

Part Context

Part of the SFH618A series, which includes DIP and tape-and-reel variants. The series is designed for space-efficient dual in-line plastic packages. Isocom Components manufactures these optically coupled isolators for general-purpose isolation tasks.

Replacement Considerations

Check for direct substitutes within the SFH618A family, such as SFH618A-3XSMT&R for tape-and-reel or SFH618A-3XG for through-hole with 10mm lead spread. Verify pinout and electrical parameters match before substitution.