SFH640-3

Overview

The SFH640-3 is a single-channel phototransistor output optocoupler featuring a GaAs infrared emitting diode optically coupled to a silicon planar phototransistor detector. It provides high isolation voltage of 5300 Vrms and operates within a temperature range of -55°C to +115°C. The device offers a current transfer ratio (CTR) between 100% and 200%, with a maximum forward current of 60 mA and collector-emitter saturation voltage of 400 mV. Packaged in a 6-DIP configuration, it supports DC input applications.

Feature Summary

• High isolation voltage capability for safe signal transmission
• Wide operating temperature range suitable for harsh environments
• Integrated base terminal on phototransistor for improved switching speed

Applications

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

Procurement Notes

Verify the specific suffix code against official Vishay documentation to confirm package type and tape/reel specifications. Ensure compliance with required safety certifications such as UL or VDE for your application. Confirm lead times and availability directly with authorized distributors, as stock levels fluctuate. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when high isolation voltage and moderate speed are required. The integrated base allows for faster turn-off times compared to standard phototransistors. Consider the 6-DIP package size for through-hole mounting constraints. Evaluate the CTR range to ensure sufficient gain for your load requirements without exceeding maximum forward current limits.

Part Context

Part of the Vishay SFH series, designed for general-purpose isolation. The SFH640-3 variant specifically denotes the 6-pin DIP package with transistor output. It complements other SFH models offering different pin counts or output types like Darlington configurations for higher gain applications.

Replacement Considerations

Check for direct substitutes within the SFH640 family or equivalent Vishay parts with matching CTR and isolation ratings. Verify pinout compatibility before substitution. Cross-reference with other manufacturers' phototransistor optocouplers ensuring identical voltage and current ratings.