SFH620A-3XSMT&R

Overview

The SFH620A-3XSMT&R is a surface mount optocoupler featuring an NPN silicon phototransistor output and inverse parallel infrared LED input. It provides one channel with a high isolation voltage of 5300 Vrms. The device supports a maximum forward current of 50 mA and offers a current transfer ratio ranging from 100% to 320%. Typical switching times include a rise time of 4 µs and a fall time of 3 µs. It is housed in a 4-pin SMD PDIP package.

Feature Summary

• Inverse parallel infrared LED input configuration for AC signal compatibility
• High dielectric isolation strength between input and output circuits
• NPN silicon phototransistor output stage for digital or analog switching

Applications

• Industrial control system isolation
• Signal transmission across isolated boundaries
• Power supply feedback loop isolation

Procurement Notes

Verify the specific suffix 'XSMT&R' confirms the surface mount PDIP package and tape-and-reel delivery format. Ensure the component meets RoHS compliance requirements if mandated by the assembly process. Cross-reference the manufacturer part number with official Isocom documentation to confirm pinout orientation and thermal specifications before integration.

Selection Notes

Select this component when high isolation voltage is required in a compact surface mount footprint. The inverse parallel LED design allows direct AC coupling without external rectification. Evaluate the current transfer ratio range against the driving circuit capabilities to ensure reliable switching performance under varying temperature conditions.

Part Context

This model belongs to the SFH620A series, which utilizes inverse parallel infrared LEDs paired with NPN phototransistors. The series is designed for general-purpose isolation applications requiring robust electrical separation. The specific variant denotes the surface mount packaging and reel configuration for automated assembly processes.

Replacement Considerations

SFH620A-3XG (DIP through-hole equivalent)

FAQ

What is the significance of the inverse parallel LED configuration?

It enables the optocoupler to respond to both positive and negative half-cycles of an AC input signal without requiring external diodes.

Does the isolation voltage rating apply continuously?

The 5300 Vrms rating indicates the dielectric withstand capability; continuous operating voltage limits are defined by the device's insulation class and safety standards.