PS9121-AX

Logic Output Optoisolators Overview

The PS9121-AX is a high-speed, active-low type optically coupled isolator manufactured by Renesas Electronics. It integrates an AlGaAs LED on the input side with a photodiode and signal processing circuitry on the output side. The device features an open-collector logic output and supports data rates up to 15 Mbps. Key electrical specifications include a forward current of 10 mA, a forward voltage of 1.65 V, and a reverse voltage of 5 V. It offers an isolation voltage of 3750 Vrms and a common-mode transient immunity of 15 kV/µs. The component is housed in a compact SO-5 surface-mount package.

Logic Output Optoisolators Feature Summary

• High common-mode rejection ratio for reliable noise immunity
• Active-low logic output configuration
• High-speed digital communication capability
• Compact surface-mount packaging

Logic Output Optoisolators Applications

• Industrial automation control systems
• Power supply feedback loops
• Communication interface isolation
• Microcontroller peripheral isolation

Logic Output Optoisolators Procurement Notes

Verify the specific suffix (e.g., -N) against your Bill of Materials, as it may indicate RoHS compliance or tape-and-reel packaging variations. Confirm the manufacturer source directly with Renesas Electronics or authorized distributors to ensure authenticity. Check lead times and regional availability, as stock levels fluctuate. Ensure the operating temperature range meets your system requirements before finalizing procurement.

Logic Output Optoisolators Selection Notes

Select this component when high-speed digital isolation is required between circuits with different ground potentials. The active-low output is suitable for interfacing with logic families that accept low-active signals. Consider the 3750 Vrms isolation rating for safety-critical applications. The SO-5 package is ideal for space-constrained designs. Verify that the 15 Mbps data rate aligns with your system's communication speed requirements.

Logic Output Optoisolators Part Context

The PS9121 series belongs to Renesas' portfolio of high-speed optocouplers designed for robust signal transmission across isolated boundaries. These devices are engineered to provide electrical isolation while maintaining signal integrity at high frequencies. The family typically includes variants with different output configurations and packaging options to suit diverse industrial and consumer electronics applications requiring galvanic isolation.

Logic Output Optoisolators Replacement Considerations

Check for direct pin-compatible replacements from Renesas or other manufacturers offering similar high-speed optocouplers with open-collector outputs. Ensure substitute parts match the 3750 Vrms isolation voltage and 15 Mbps data rate. Verify that the replacement maintains the same SO-5 footprint and active-low logic functionality to avoid redesigning the PCB layout or software logic.

Logic Output Optoisolators FAQ

What is the common-mode transient immunity of the PS9121-AX?

The PS9121-AX has a common-mode transient immunity of 15 kV/µs.

Is the output of the PS9121-AX active-high or active-low?

The PS9121-AX features an active-low logic output configuration.

What is the maximum data rate supported by this isolator?

The device supports a nominal data rate of 15 Mbps.