SFH6156

Overview

The SFH6156 is a single-channel transistor output optocoupler from Vishay Semiconductors, designed for surface-mount applications. It features an NPN phototransistor output with a maximum collector-emitter voltage of 70 V and a peak forward current rating of 60 mA. The device provides high isolation capability with a rated insulation voltage of 5300 Vrms. Standard packaging includes SMD-4 configurations. Performance varies by suffix, with typical rise times ranging from 2 to 4 microseconds and fall times between 14 and 15 microseconds. Power dissipation is limited to 150 mW, supporting operation within a temperature range of -55°C to +100°C.

Feature Summary

• Provides galvanic isolation via infrared LED and NPN phototransistor architecture
• Supports surface-mount installation in compact SMD-4 packages
• Delivers high-voltage isolation rated at 5300 Vrms
• Features fast switching characteristics suitable for digital signal transmission

Applications

• Industrial control systems requiring signal isolation
• Communication equipment interface circuits
• Power supply feedback loops
• Microcontroller input/output isolation

Procurement Notes

Verify the specific suffix (e.g., -1T, -2, -3X001T) to confirm Current Transfer Ratio ranges and packaging type. Confirm RoHS compliance status through official datasheets. Ensure the selected variant matches the required isolation voltage and thermal performance specifications for the target application environment.

Selection Notes

Select variants based on required Current Transfer Ratio accuracy and speed. Higher CTR options like the -4 series offer greater gain but may have different switching speeds compared to lower CTR versions. Consider package availability, such as tube versus reel formats, when planning assembly processes. Verify that the 60 mA forward current limit aligns with the driving circuit capabilities.

Part Context

The SFH6156 belongs to Vishay's SFH series of surface-mount optocouplers. This family offers various CTR grades and packaging options to suit different design constraints. The component serves as a standard solution for isolating low-voltage control signals from higher-voltage power stages in electronic systems.

Replacement Considerations

Direct substitutes include other Vishay SFH6156 variants with matching pinouts and electrical ratings. Cross-brand replacements require verification of isolation voltage, CTR, and package dimensions to ensure compatibility.