FM809SP3X

Supervisors Overview

The FM809SP3X is a 3-pin UC Supervisor Circuit manufactured by Fairchild Semiconductor. It belongs to the FM809 series of power supply support circuits designed for monitoring voltage levels in electronic systems. The component is housed in a PDSO3 package, specifically identified as SOT-23 with three pins. This integrated circuit functions as a supervisor to ensure reliable operation by detecting under-voltage or over-voltage conditions within the monitored power rail.

Supervisors Feature Summary

• Provides continuous supervision of power supply voltage levels
• Ensures system reliability through dedicated reset signal generation
• Compact 3-pin surface-mount design for space-constrained applications

Supervisors Applications

• Power supply monitoring in embedded systems
• Voltage supervision for microcontroller reset circuits
• Under-voltage detection in portable electronic devices

Supervisors Procurement Notes

Verify the specific suffix SP3X against official Fairchild documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with existing PCB footprint and soldering profiles. Cross-reference with Rochester Electronics listings if sourcing from secondary distributors to confirm authenticity and lot traceability.

Supervisors Selection Notes

Select this component when a compact, low-pin-count solution is required for basic voltage supervision. Consider the SOT-23 package constraints for thermal management and board space. Evaluate if the standard supervision thresholds meet the system requirements without external components.

Supervisors Part Context

The FM809SP3X is part of the broader FM809 family of 3-pin UC Supervisor Circuits produced by Fairchild Semiconductor. Related variants include FM809JP3X, FM809JS3X, and FM809LP3X, which share similar functional descriptions but may differ in specific electrical characteristics or packaging options within the same product line.

Supervisors Replacement Considerations

Potential substitutes include FM809JP3X, FM809JS3X, and FM809LP3X from Fairchild, or cross-manufacturer equivalents like PCS809 from PulseCore Semiconductor. Verify pinout compatibility and supervision thresholds before substitution.