PS2502-4XSM

Overview

The PS2502-4XSM is a high-density, surface-mount photodarlington optocoupler manufactured by Isocom Components. It features four independent Darlington transistor channels within a single package, providing robust electrical isolation between input and output circuits. The device utilizes an infrared LED for signal transmission and includes integrated base resistors to simplify circuit design. Key specifications include a maximum forward voltage of 1.4V, a typical current transfer ratio of 500%, and a minimum CTR of 100%. It offers a high isolation voltage of 5300Vrms and operates within a temperature range of -30°C to +100°C.

Feature Summary

• Four-channel configuration with integrated base resistors for simplified driving
• High isolation voltage capability for safe circuit separation
• Darlington output structure providing high current gain
• Surface-mount packaging for automated assembly

Applications

• Industrial control systems requiring multi-channel isolation
• Power supply units for feedback loop isolation
• Solid-state relay driver circuits
• Microprocessor interface isolation

Procurement Notes

Verify the specific suffix 'XSM' against official Isocom documentation to confirm surface-mount variant status and lead time requirements. Ensure compatibility with standard reflow soldering profiles. Confirm that the four-channel configuration meets the system's isolation and channel count needs without requiring additional components.

Selection Notes

Select this component when multiple isolated channels are required in a compact footprint. The integrated base resistors reduce external component count compared to discrete solutions. Consider the high current transfer ratio for applications demanding significant output current from low input drive levels. Verify thermal management requirements due to power dissipation in dense PCB layouts.

Part Context

This part belongs to the PS2502 series of high-density photodarlington optocouplers. It serves as a modern alternative to through-hole equivalents like the PS2502-4N, offering similar electrical characteristics in a surface-mount format. The series is designed for applications requiring reliable isolation in space-constrained environments.

Replacement Considerations

Direct replacements include the PS2502-4N (through-hole) for mechanical adaptation or other manufacturers' PS2502-4 variants such as those from Renesas or California Eastern Labs. Verify pinout compatibility and isolation voltage ratings before substitution.