SFH618A-3XG

Overview

The SFH618A-3XG is a single-channel optocoupler manufactured by Isocom Components 2004 LTD. It integrates an infrared LED with an NPN silicon phototransistor in a 4-pin DIP package. Key electrical parameters include a maximum forward voltage of 1.65V, a typical rise time of 4µs, and a typical fall time of 3µs. The device supports a maximum input current of ±50 mA and offers a minimum isolation voltage of 5300 Vrms. Current transfer ratios range from a minimum of 100% to a maximum of 320%.

Feature Summary

• Integrates an infrared light emitting diode and an NPN silicon photo transistor for signal isolation.
• Provides high voltage isolation capability suitable for separating circuits with different potential levels.
• Features a space-efficient four-pin dual in-line package design for standard mounting applications.

Applications

• General purpose signal isolation in electronic circuits
• Interface between microprocessors and peripheral devices
• Switching applications requiring galvanic isolation

Procurement Notes

Verify the specific suffix '3XG' against official manufacturer documentation to confirm the exact pin configuration and packaging variant. Ensure that the required isolation voltage and current transfer ratio meet the specific circuit design requirements before procurement. Cross-reference the datasheet for absolute maximum ratings to prevent component damage during operation.

Selection Notes

Select this component when a single channel of isolation with NPN output is required. Consider the 5300 Vrms isolation rating for safety-critical applications. Evaluate the 4µs rise and 3µs fall times against the system's switching speed requirements. Confirm compatibility with the 4-pin DIP footprint during PCB layout planning.

Part Context

The SFH618A series consists of optically coupled isolators combining infrared LEDs and NPN silicon phototransistors. This family provides efficient space utilization for various isolation needs. The SFH618A-3XG represents a specific variant within this series, distinguished by its DIP packaging and specific electrical characteristics defined by the manufacturer.

Replacement Considerations

Compatible substitutes include other SFH618 series variants such as SFH618A-3XSMT&R for surface mount needs or SFH618A-2G for alternative packaging. Verify pinout compatibility and electrical specifications before substitution.

FAQ

What is the typical switching speed of the SFH618A-3XG?

The device has a typical rise time of 4µs and a typical fall time of 3µs.

What type of output transistor does this optocoupler use?

It utilizes an NPN silicon phototransistor for the output stage.