SFH620A-3

Overview

The SFH620A-3 is a single-channel optically coupled isolator manufactured by Isocom Components 2004 LTD. It integrates inverse parallel infrared light emitting diodes with an NPN silicon phototransistor to facilitate AC input signal isolation. The device provides high current transfer ratios and low coupling capacitance, ensuring reliable signal transmission across electrical barriers. Key electrical specifications include an input-to-output isolation voltage of 5300 VRMS and a peak withstand voltage of 7500 VPK. The collector-emitter saturation voltage is specified at 0.4 V under conditions of 10 mA forward current and 2.5 mA collector current. These parameters define its performance in standard digital isolation applications.

Feature Summary

• Features inverse parallel infrared LEDs for direct AC input compatibility without external rectification
• Provides high isolation voltage ratings suitable for demanding safety standards
• Utilizes NPN silicon phototransistor output for robust digital switching capabilities

Applications

• Logic-to-logic isolation in noisy industrial environments
• Line receiver circuits requiring AC signal processing
• Digital control interfaces for motors and servo machines

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure the correct package type and compliance certifications are selected. Confirm that the component meets all relevant regulatory requirements for your target market, including UL and VDE standards. Cross-reference the part number with authorized distributors to avoid counterfeit products and ensure supply chain integrity.

Selection Notes

Select this component when AC input isolation is required without additional rectifying components. Evaluate the 5300 VRMS isolation rating against system voltage requirements. Consider the current transfer ratio and saturation voltage for logic level compatibility. Ensure the DIP package format fits the PCB layout constraints compared to surface-mount alternatives like the SFH6206 series.

Part Context

The SFH620A series represents Isocom's line of plastic commercial optocouplers, evolving from earlier military-grade ceramic products. This series serves as a replacement for legacy parts from manufacturers such as Litronix and Siemens. The SFH620A-3 specifically targets general-purpose isolation needs, offering a balance of performance and cost-effectiveness for commercial electronics manufacturing.

Replacement Considerations

Publicly confirmed substitute part numbers for the SFH620A-3 are not available in the provided source material. Engineers should consult official cross-reference lists or contact the manufacturer directly for verified equivalent components.