4N33SM

Overview

The onsemi 4N33SM is a single-channel Photodarlington optocoupler housed in a 6-pin surface-mount package. It provides an isolation voltage of 7500 Vrms, with a maximum collector-emitter voltage of 30 V and a peak forward current rating of 80 mA. The device features a typical rise time of 5 μs and operates within a temperature range of -40°C to +100°C. Power dissipation is rated at 270 mW, ensuring reliable signal transmission in compact designs.

Feature Summary

• High isolation capability with 7500 Vrms dielectric strength for robust circuit protection
• Photodarlington output structure delivers high current transfer ratio for logic interfacing
• Surface-mount packaging facilitates automated assembly and space-constrained layouts

Applications

• Low power logic circuit isolation
• Solid state relay driver interfaces
• General purpose signal coupling in industrial equipment

Procurement Notes

Verify the specific suffix designation against the manufacturer's latest documentation to confirm pinout orientation and lead material specifications. Ensure that the selected variant matches the required isolation voltage class and thermal performance criteria for the intended application environment before finalizing component selection.

Selection Notes

Select this component when high isolation voltage is critical alongside compact surface-mount requirements. Compare the 7500 Vrms rating against standard DIP alternatives to determine suitability for high-voltage noise immunity. Evaluate the photodarlington output speed against system timing constraints to ensure adequate response rates for data transmission applications.

Part Context

This device belongs to the general-purpose Photodarlington optocoupler family from onsemi. It shares functional similarities with through-hole variants but utilizes a surface-mount form factor. The series is designed for reliable operation in environments requiring electrical isolation between low-power control circuits and higher-voltage loads or signals.

Replacement Considerations

Direct substitutes include other 6-pin SMD Photodarlington optocouplers with comparable isolation ratings. Verify pin compatibility and current transfer ratios when cross-referencing with equivalent parts from other manufacturers to ensure seamless integration without redesigning the PCB layout.