SFH6156-3

Overview

The SFH6156-3 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output housed in a compact SMD-4 surface-mount package. The device provides high isolation with a rated insulation voltage of 5300 Vrms, ensuring safety in high-voltage applications. Key electrical parameters include a current transfer ratio (CTR) ranging from 100% to 200%, a maximum collector-emitter voltage of 70 V, and a peak forward current capability of 60 mA. The component operates within a temperature range of -55°C to +100°C and exhibits typical switching times of 3 µs rise and 14 µs fall.

Feature Summary

• High reliability design certified for 5300 Vrms insulation voltage
• NPN phototransistor output configuration for direct logic interfacing
• Compact SMD-4 surface-mount footprint for automated assembly

Applications

• Industrial control systems requiring galvanic isolation
• Power supply feedback loops for signal transmission
• Microcontroller input isolation for noise immunity

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as SFH6156-3T or SFH6156-3X001T may indicate different packaging formats like tape and reel versus tube. Confirm that the required CTR bin matches the 100-200% specification for the base model. Ensure compliance with RoHS directives and check for any recent Product Change Notifications regarding lead frame or assembly modifications before finalizing procurement.

Selection Notes

Select this component when high isolation voltage and moderate speed are required in a small form factor. The 100-200% CTR range offers flexibility for various drive currents. Consider the SFH6156-4 if a higher CTR of 160-320% is needed for improved sensitivity. Evaluate the thermal dissipation capabilities against the 150 mW power rating for dense PCB layouts.

Part Context

This part belongs to the SFH6156 series of high-reliability optocouplers designed for robust performance in demanding environments. The series utilizes advanced semiconductor processes to ensure consistent CTR linearity and long-term stability. It serves as a standard solution for isolating low-voltage digital signals from high-voltage analog or power circuits.

Replacement Considerations

The SFH6156-4 is a confirmed substitute offering identical pinout and package but with a higher CTR range of 160-320%. Other generic replacements require careful verification of isolation voltage, CTR, and switching speed to ensure functional equivalence.