PS2502-1-L-A

Overview

The PS2502-1-L-A is an optically coupled isolator manufactured by CEL. It integrates a Gallium Arsenide (GaAs) light emitting diode with an NPN silicon Darlington phototransistor. The device provides high isolation voltage capabilities for signal transmission between isolated circuits. Key electrical characteristics include a minimum collector-emitter breakdown voltage of 40 V and a maximum collector dark current of 400 nA. The nominal current transfer ratio is specified at 2000%. The component operates in a single configuration, designed for reliable optical coupling in industrial and commercial applications requiring galvanic isolation.

Feature Summary

• Integrates a GaAs LED with an NPN silicon Darlington phototransistor for efficient optical coupling
• Provides high isolation voltage performance to protect sensitive circuitry
• Features a high nominal current transfer ratio for robust signal transmission

Applications

• Industrial control systems requiring galvanic isolation
• Signal transmission between microprocessors and power circuits
• Noise immunity enhancement in data communication interfaces

Procurement Notes

Verify the specific suffix 'L' against the manufacturer's official documentation to confirm package type and compliance status. Ensure the part number matches the exact electrical specifications required for your design, particularly the 40V breakdown voltage and 400nA dark current limits. Cross-reference with authorized distributors to confirm availability and authenticity.

Selection Notes

Select this component when a high current transfer ratio is necessary to drive loads directly from the phototransistor output. The Darlington configuration offers higher gain compared to standard phototransistors but may exhibit slower switching speeds. Consider the 40V isolation rating when designing for low-to-medium voltage isolation barriers.

Part Context

This part belongs to the PS2502 series of optocouplers, which are widely used for isolation purposes. The series includes variants with different pin configurations and packaging options. The PS2502-1-L-A specifically denotes a single-channel device with a particular lead form or compliance marking indicated by the suffix.

Replacement Considerations

Direct replacements must match the NPN Darlington output structure and GaAs input. Verify that substitute parts meet the 40V minimum breakdown voltage and similar current transfer ratio requirements. Check pinout compatibility to ensure seamless integration without PCB redesign.