SFH620A-3G

Overview

The SFH620A-3G is a single-channel optocoupler featuring inverse parallel infrared LEDs and an NPN silicon phototransistor. It supports AC input signals with a maximum forward voltage of 1.65V and a peak input current of ±50 mA. The device offers a minimum isolation voltage of 5300 Vrms, ensuring robust electrical separation. Current transfer ratios range from 100% to 320%, with typical rise and fall times of 4µs and 3µs respectively. Packaged in a 4-pin DIP for through-hole mounting.

Feature Summary

• AC Input Capability: Inverse parallel LED configuration enables direct coupling to alternating current signals without external rectification.

Applications

• Logic-to-logic isolation in noisy environments
• Line receiver circuits
• Industrial control systems

Procurement Notes

Verify the specific suffix '3G' against official Isocom documentation to confirm pinout and compliance status. Ensure the procurement channel provides valid traceability for the DIP-4 package. Cross-reference the manufacturer part number with authorized distributor lists to avoid counterfeit components. Confirm that the AC input rating aligns with your circuit design requirements before finalizing orders.

Selection Notes

Select this component when AC signal isolation is required within a single channel. The inverse parallel LED structure simplifies circuit design by eliminating the need for external diodes. Verify that the 5300 Vrms isolation voltage meets safety standards for your application. Ensure the NPN output interface matches the receiving logic level and current requirements of the downstream system.

Part Context

The SFH620A series belongs to Isocom's line of optically coupled isolators, designed as industry-standard replacements. These devices combine infrared emitters with silicon phototransistors to provide reliable signal transmission across isolated boundaries. The series is widely used in applications requiring high isolation voltage and compatibility with standard digital interfaces.

FAQ

How does the SFH620A-3G handle AC input signals?

It utilizes inverse parallel infrared LEDs, allowing it to conduct during both positive and negative half-cycles of an AC input signal without additional rectification components.

What is the isolation voltage rating?

The device provides a minimum isolation voltage of 5300 Vrms between the input LED and output phototransistor.