PS9121-A

Logic Output Optoisolators Overview

The PS9121-A is a high-speed, active-low type optically coupled isolator manufactured by CEL. It integrates a GaAlAs LED on the input side with an open collector output IC on the output side. The device operates within a supply voltage range of 2.7V to 3.6V and supports data transmission rates up to 15 Mbps. It features high common mode transient immunity and provides electrical isolation rated at 3.75 kVrms. The component is housed in a compact 5-lead SOIC package.

Logic Output Optoisolators Feature Summary

• High-speed response capability for logic interface circuits
• Active low output configuration with open collector structure
• High common mode transient immunity for noise reduction
• Operable at elevated temperatures up to 100°C

Logic Output Optoisolators Applications

• High-speed logic interface circuits
• Measurement equipment signal isolation
• FA network communication interfaces

Logic Output Optoisolators Procurement Notes

Verify the specific suffix designation against official documentation, as variations such as -AX or -F3 may indicate different packaging formats like tape-and-reel quantities. Confirm current lifecycle status, as some listings indicate this part number may be discontinued or obsolete depending on the distributor region. Ensure compatibility with 3.3V logic systems during integration.

Logic Output Optoisolators Selection Notes

Select this component when designing circuits requiring high-speed digital isolation with active-low output characteristics. It is suitable for applications demanding high common mode rejection ratios in noisy environments. Verify that the required operating temperature range extends to 100°C and that the 5-lead SOIC footprint fits the PCB layout constraints.

Logic Output Optoisolators Part Context

This device belongs to the NEPOC series of high-speed photocouplers from CEL. It shares architectural similarities with other models in the family, such as the PS9123, but differs in its specific output stage configuration. The PS9121-A is designed to replace older discrete isolation solutions in modern high-density electronic designs.

Logic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.