SFH608-4

Overview

The SFH608-4 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output with a base connection, housed in a 6-DIP (PDIP-6) through-hole package. The device provides high isolation voltage of 5300 Vrms and supports a maximum collector current of 50 mA. Key electrical parameters include a forward current of 50 mA, forward voltage of 1.5 V, and collector-emitter saturation voltage of 400 mV. The current transfer ratio ranges from 160% to 320%. Switching characteristics include a rise time of 5 µs and fall time of 7 µs. It operates within a temperature range of -55°C to +100°C.

Feature Summary

• High current transfer ratio for efficient signal transmission
• Integrated base connection on the phototransistor for enhanced switching speed control
• Robust insulation voltage rating for reliable circuit isolation

Applications

• Industrial control systems requiring galvanic isolation
• Power supply feedback loops
• Signal isolation in microprocessor interfaces

Procurement Notes

Verify component authenticity and datasheet alignment before procurement. Confirm that the specific suffix matches design requirements, as variations may exist. Check availability status due to potential lifecycle changes. Ensure handling procedures comply with electrostatic discharge precautions. Validate thermal performance within the specified operating temperature range during integration.

Selection Notes

Select this component when high current transfer efficiency and fast switching are required. The integrated base allows for improved turn-off times compared to standard phototransistors. Consider the 6-DIP package for through-hole mounting constraints. Evaluate the 5300 Vrms isolation capability against system safety standards. Ensure the 50 mA collector current limit meets load requirements.

Part Context

The SFH608 series comprises transistor output optocouplers designed for applications demanding high reliability and fast response. The SFH608-4 variant specifically offers a higher current transfer ratio range compared to other members like the SFH608-2. This family is commonly used in industrial and consumer electronics where electrical isolation between input and output circuits is critical for safety and noise immunity.

Replacement Considerations

Direct substitutes within the same manufacturer line include SFH608-2, SFH608-3, and SFH608-5, which share similar packaging and basic electrical characteristics but differ in current transfer ratio specifications. Cross-manufacturer replacements require verification of pinout compatibility, isolation voltage ratings, and switching speeds.