SFH628A-4X016

Overview

The SFH628A-4X016 is a single-channel AC input-transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features a NPN phototransistor output with a maximum collector-emitter voltage of 55 V and a peak forward current rating of 50 mA. The device provides high isolation capability with a maximum insulation voltage of 5300 Vrms. Key electrical parameters include a typical rise time of 3.5 µs and fall time of 5 µs, with a power dissipation limit of 150 mW. The unit is housed in a standard DIP-4 package suitable for through-hole mounting.

Feature Summary

• AC input configuration allows direct connection to alternating current sources without additional rectification circuitry
• High isolation voltage rating ensures robust safety barriers between input and output circuits
• NPN phototransistor output provides reliable switching performance with defined current transfer characteristics

Applications

• Solid-state relay interfaces requiring AC signal detection
• Industrial control systems needing galvanic isolation for AC inputs
• Power supply feedback loops utilizing AC line monitoring

Procurement Notes

Verify the specific datasheet revision and manufacturer documentation before integration, as component specifications may vary across production batches or regional variants. Confirm that the DIP-4 package dimensions align with your PCB footprint requirements. Ensure that thermal management strategies account for the 150 mW power dissipation limit under worst-case operating conditions. Cross-reference official Vishay documentation to validate the 5300 Vrms insulation rating for your safety compliance needs.

Selection Notes

Choose this component when AC input sensing is required alongside high-voltage isolation. The 55 V collector-emitter voltage rating suits low-voltage logic interfacing. Consider the 50 mA forward current limit for drive circuit design. The DIP-4 form factor facilitates easy prototyping and manual assembly. Evaluate the 3.5 µs rise time against system speed requirements to ensure adequate response latency for the intended application frequency.

Part Context

This device belongs to the family of transistor-output optocouplers designed for general-purpose isolation applications. It distinguishes itself through its AC input capability, eliminating the need for external diodes often required in DC-input variants. The DIP-4 packaging remains a standard choice for legacy and modern through-hole designs. Vishay Semiconductor Opto Division produces this series to meet industrial reliability standards for signal transmission across isolated boundaries.

Replacement Considerations

The VO617A-4X016 is documented as a recommended alternative with similar transistor output characteristics. Verify pin compatibility and electrical parameter margins before substitution. Ensure the replacement part meets the same 5300 Vrms isolation requirement and fits the existing DIP-4 footprint without mechanical interference.