4N28S-TA

Overview

The Lite-On 4N28S-TA is a surface-mount transistor output optocoupler featuring an NPN phototransistor. It provides electrical isolation between input and output circuits with a rated insulation voltage of 5000 Vrms. The device supports a maximum collector current of 100 mA and a collector-emitter voltage of 30 V. It operates with a forward current up to 80 mA and offers a minimum current transfer ratio of 10% at 10 mA. The component is housed in a 6-pin SMD package designed for automated assembly processes.

Feature Summary

• Provides galvanic isolation between input and output circuits using light transmission
• Features an NPN phototransistor output for effective signal switching and coupling
• Designed for surface-mount technology (SMT) applications requiring compact form factors

Applications

• Signal coupling in general-purpose electronic circuits
• Switching applications requiring electrical isolation
• Interface circuits between low-voltage logic and higher-voltage loads

Procurement Notes

Verify the specific suffix TA against the manufacturer's latest datasheet to confirm surface-mount configuration and tape-and-reel packaging details. Ensure compliance with RoHS directives as indicated by the product classification. Cross-reference the insulation voltage rating with system requirements to guarantee adequate safety margins for the intended application environment.

Selection Notes

Select this component when surface-mount integration is required alongside moderate speed performance. The NPN output structure suits standard switching interfaces. Evaluate the 5000 Vrms isolation capability against regulatory safety standards. Consider the 10% minimum CTR for drive circuit design to ensure reliable saturation under varying temperature conditions.

Part Context

This part belongs to the 4N28 series of transistor output optocouplers manufactured by Lite-On. The 'S' designation typically indicates a surface-mount variant, while 'TA' often refers to specific packaging or processing configurations. It serves as a modern alternative to through-hole equivalents like the 4N28, offering similar functional characteristics in a smaller footprint suitable for high-density PCB layouts.

Replacement Considerations

Direct substitutes include other surface-mount transistor output optocouplers from Lite-On such as the LTV-4N28S-TA. Verify pinout compatibility and isolation voltage ratings before substitution. Generic replacements must match the NPN output type and SMD package dimensions to ensure mechanical fit.