SFH618A-4SMT&R

Overview

The SFH618A-4SMT&R is a single-channel optocoupler manufactured by Isocom Components 2004 LTD. It features a transistor output with an integrated base for enhanced switching performance. The device provides a high isolation voltage of 5300Vrms and supports a maximum collector current of 50mA per channel. Key electrical parameters include a minimum current transfer ratio of 160% at 10mA input current, a typical forward voltage of approximately 1.15V, and a saturation voltage drop of 400mV. The component is designed for surface mount installation in a 4-SMD package.

Feature Summary

• High isolation voltage capability of 5300Vrms for robust circuit protection
• Transistor output with integrated base terminal to improve switching speed
• Surface mount packaging suitable for automated assembly processes

Applications

• General purpose signal isolation in industrial control systems
• Interface between microcontrollers and power switching devices
• Signal transmission across isolated ground planes

Procurement Notes

Verify the specific manufacturer designation when sourcing this component, as distribution channels may list it under alternative branding or legacy part numbers. Confirm that the 4-SMD package variant matches the design requirements, as pinout configurations can vary between manufacturers offering similar functional equivalents. Ensure compliance with RoHS directives if required for the target application environment.

Selection Notes

Select this component when a balance of moderate speed and high isolation voltage is required for single-channel applications. The integrated base feature makes it suitable for designs needing faster turn-off times compared to standard phototransistors. Consider the 50mA output current limit and the 160% CTR minimum when designing drive circuits to ensure reliable operation across temperature variations.

Part Context

This component belongs to the family of surface-mount optocouplers designed for general-purpose isolation tasks. It utilizes infrared LED technology coupled with a silicon phototransistor. The 4-SMD form factor allows for compact PCB layouts, distinguishing it from larger through-hole variants while maintaining comparable electrical isolation characteristics for standard digital signal applications.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly documented in the provided source material. Users should consult official datasheets for direct pin-compatible alternatives or verify functional equivalence with other 5kVrms transistor output optocouplers in 4-SMD packages.