4N28SR2VM

Overview

The 4N28SR2VM is a single-channel transistor output optocoupler manufactured by onsemi. It integrates a gallium arsenide infrared emitting diode with an NPN phototransistor featuring a base terminal for enhanced switching control. The device offers a high isolation voltage of 4170Vrms and operates within a temperature range of -40°C to 100°C. Key electrical parameters include a maximum forward current of 60mA, a collector-emitter saturation voltage of 500mV, and a typical rise/fall time of 2µs. It is housed in a compact 6-SMD鸥翼 package.

Feature Summary

• Integrates a gallium arsenide infrared LED with an NPN phototransistor that includes a dedicated base terminal for improved switching performance.
• Provides robust electrical isolation rated at 4170Vrms between input and output circuits.
• Utilizes proprietary process technology to ensure reliable operation across a wide industrial temperature range.

Applications

• Industrial communication interfaces requiring galvanic isolation
• Solid-state relay driver circuits
• Microcontroller input/output isolation

Procurement Notes

Verify the specific suffix SR2VM to confirm the tape-and-reel packaging format and compliance requirements. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability. Cross-reference the manufacturer part number with official datasheets to confirm pinout compatibility before integration into existing designs.

Selection Notes

Select this component when a base terminal is required for faster turn-off times or controlled saturation compared to standard phototransistors. The 6-SMD surface-mount package facilitates automated assembly and space-constrained layouts. Verify that the 30V collector-emitter voltage rating meets the load requirements of the target application circuit.

Part Context

This device belongs to the 4N28 family of optocouplers, which are widely used for general-purpose isolation. The SR2VM variant specifically denotes the surface-mount configuration with reel packaging. It serves as a modern replacement for through-hole equivalents in applications demanding higher density and automated manufacturing processes.

Replacement Considerations

Direct substitutes include other 4N28 variants such as the 4N28SM for bulk packaging. For pin-compatible alternatives, consider the PC817 series or ILD207, though electrical characteristics like CTR and isolation voltage must be validated against the original design specifications.

FAQ

What is the purpose of the base terminal on the phototransistor?

The base terminal allows for external connection to improve switching speed and provide better control over the transistor's saturation state, reducing storage time during turn-off.

What is the maximum operating temperature for this optocoupler?

The device is rated for operation up to 100°C, making it suitable for industrial environments with elevated thermal conditions.