SFH628A-4

Overview

The SFH628A-4 is a single-channel AC input-transistor output optocoupler in a DIP-4 package. It provides 5300 Vrms isolation voltage and supports an NPN phototransistor output with a collector-emitter breakdown voltage of 55 V. The device features a current transfer ratio ranging from 160% to 500% at a forward current of 1 mA, with a maximum forward current of 50 mA. Operating temperature spans -55°C to +100°C, and it exhibits low coupling capacitance for high common-mode interference immunity.

Feature Summary

• AC input capability allows direct connection to alternating current signals without additional rectification circuitry.
• High isolation voltage rating ensures robust electrical separation between input and output circuits.
• Low coupling capacitance design provides effective rejection of high-frequency common-mode noise.

Applications

• Telecommunications equipment interface circuits
• Industrial control system signal isolation
• Battery-powered equipment monitoring

Procurement Notes

Verify the specific suffix against official Vishay documentation to confirm pinout and packaging configuration. Ensure the component meets required isolation standards for the target application environment. Cross-reference datasheet parameters such as CTR and isolation voltage with system specifications before procurement.

Selection Notes

Select this component when AC signal detection is required with galvanic isolation. The DIP-4 package suits through-hole mounting applications. Verify that the 55 V collector-emitter voltage rating exceeds the peak output voltage in the load circuit. Consider the operating temperature range for environmental compatibility.

Part Context

This part belongs to the SFH628 series of optocouplers manufactured by Vishay Semiconductor Opto Division. The series includes variants with different packaging options and current transfer ratio grades. The SFH628A-4 specifically denotes the DIP-4 through-hole package variant with defined AC input characteristics.

Replacement Considerations

Check for SFH628A-3X016 or SFH628A-4-X016 equivalents if pinout compatibility is required. Verify that substitute components maintain the 5300 Vrms isolation rating and AC input functionality. Confirm that the replacement's current transfer ratio falls within the acceptable range for the circuit design.