SFH608-3

Overview

The SFH608-3 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor with a base connection for enhanced switching speed and stability. The device provides high isolation capability of 5300 Vrms, suitable for demanding industrial applications. It operates within a temperature range of -55°C to +100°C and utilizes a PDIP-6 through-hole package. Key electrical parameters include a maximum collector-emitter voltage of 55 V, a collector current of 50 mA, and a forward voltage of 1.5 V at 50 mA input.

Feature Summary

• Integrated base connection on the phototransistor to improve switching performance and reduce storage time.
• High insulation voltage rating of 5300 Vrms ensuring robust signal isolation between input and output circuits.
• Wide operating temperature range supporting reliable functionality in extreme environmental conditions.

Applications

• Industrial automation control systems requiring galvanic isolation
• Power supply feedback loops for voltage regulation
• Microcontroller interface circuits for signal level translation

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and specific lot codes against current datasheet revisions. Ensure handling procedures adhere to electrostatic discharge (ESD) protection standards during assembly. Check for any recent product change notifications regarding material composition or packaging specifications before finalizing procurement orders.

Selection Notes

Select this component when high-speed switching is required due to its base-connected phototransistor design. Consider the PDIP-6 package for through-hole mounting requirements. Evaluate the 5300 Vrms isolation rating against system safety standards. Compare current transfer ratio ranges if precise gain control is necessary for the specific application circuit design.

Part Context

This part belongs to the SFH608 series of optocouplers from Vishay. It shares architectural similarities with other models in the family but differs in specific electrical characteristics and package configurations. The series is designed for general-purpose isolation tasks where reliability and speed are prioritized over cost-sensitive mass production volumes.

Replacement Considerations

SFH608-2: Similar NPN output but without base connection, resulting in slower switching times. SFH608-4: Higher current transfer ratio range (160-320%) compared to standard variants. Verify pin compatibility and thermal characteristics when substituting within the same DIP-6 form factor.

FAQ

What is the function of the base connection in the SFH608-3?

The base connection allows for external biasing or grounding to accelerate the turn-off time of the phototransistor, improving overall switching speed compared to standard phototransistors.

Is the SFH608-3 suitable for high-frequency applications?

Yes, the integrated base connection reduces storage time, making it more suitable for higher frequency switching applications than standard transistor-output optocouplers.