SFH617A-1

Overview

The SFH617A-1 is a single-channel optoisolator manufactured by Isocom Components 2004 LTD. It features an infrared LED input coupled to an NPN silicon phototransistor output, providing electrical isolation with a rated insulation voltage of 4470 Vrms. The device is housed in a standard 4-pin Dual In-line Package (DIP). Key electrical parameters include a maximum collector current of 50 mA and a maximum collector-emitter voltage of 70 V. The unit supports a forward current up to 50 mA and operates within a temperature range of -30°C to 100°C.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits using an infrared LED and NPN phototransistor configuration.
• Offers reliable signal transmission through direct coupling without physical electrical connections.
• Designed for robust performance across a wide operating temperature range suitable for industrial environments.

Applications

• General-purpose signal isolation in electronic circuits
• Interface applications between low-voltage logic and higher-voltage systems
• Switching control in power supply units

Procurement Notes

Verify the specific manufacturer designation when sourcing, as this component may be listed under alternative part numbers or associated with different manufacturers such as Vishay Semiconductors depending on the supply chain source. Confirm that the requested unit matches the Isocom Components 2004 LTD specification sheet regarding the 4470 Vrms isolation rating and DIP-4 package dimensions to ensure compatibility with existing board layouts and safety requirements.

Selection Notes

Select this component for applications requiring moderate speed switching and high isolation voltage in a through-hole format. Consider the 50 mA collector current limit and 70 V breakdown voltage when designing the load circuit. Ensure the driving circuit can provide sufficient forward current to achieve the required current transfer ratio while staying within the maximum ratings defined in the official datasheet.

Part Context

This device belongs to the SFH617A series of transistor-output optocouplers. Similar variants in this family include the SFH617A-2X, SFH617A-3X, and SFH617A-4, which share similar functional principles but may differ in packaging options such as surface-mount configurations or slight variations in electrical characteristics like isolation voltage ratings.

Replacement Considerations

Public confirmed substitute part numbers include VO617A-4 from Vishay Semiconductors. When replacing, verify that the alternative component meets the same isolation voltage and pinout requirements to maintain circuit integrity.