SFH617A-1

Overview

The SFH617A-1 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output and utilizes through-hole PDIP-4 packaging. The device provides high isolation with a rated insulation voltage of 5300 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 70 V, a maximum collector current of 50 mA, and a power dissipation of 150 mW. The forward current rating is 60 mA with a typical forward voltage of 1.65 V. The current transfer ratio ranges from 40% to 80%. Switching characteristics specify a rise time of 2 µs and a fall time of 11 µs. The component operates within a temperature range of -55°C to +110°C.

Feature Summary

• Provides galvanic isolation between input and output circuits using infrared LED and NPN phototransistor technology.
• Features high reliability construction suitable for demanding industrial environments.
• Offers fast switching performance with a typical rise time of 2 microseconds.

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops
• Solid-state relay driver circuits

Procurement Notes

Verify the specific suffix designation when ordering, as it indicates the tape and reel or tube packaging configuration. Confirm that the required current transfer ratio bin aligns with the application's sensitivity requirements. Ensure the PCB footprint matches the standard PDIP-4 package dimensions. Check for compliance with relevant safety standards such as UL1577 or IEC 60065 if used in certified equipment.

Selection Notes

Select this component when a robust, high-voltage isolated interface is needed for digital signal transmission. The NPN open-collector output requires a pull-up resistor for proper logic level interfacing. Consider the thermal management capabilities given the 150 mW power dissipation limit. Compare the 40-80% CTR range against other variants like the SFH617A-4 if higher gain is necessary for low-input-current applications.

Part Context

This part belongs to the SFH617 series of high-reliability optocouplers designed for general-purpose isolation tasks. It shares the same physical footprint and basic electrical limits as other members of the family but differs in current transfer ratio specifications. The series is widely used in legacy and modern designs requiring verified isolation barriers.

Replacement Considerations

The VO617A-1 is listed as a recommended alternative with identical pinout and functional characteristics. Verify that any substitute component meets the same insulation voltage and safety certification requirements before integration.