FM809RP3X

Supervisors Overview

The FM809RP3X is a 3-pin microcontroller supervisor circuit manufactured by Fairchild Semiconductor, now part of onsemi. It monitors system voltage and generates a reset pulse when the monitored voltage falls below or exceeds specified thresholds. The device features an active low push-pull output and operates within a supply voltage range of 1.1 V to 5.5 V. Key electrical parameters include an under-voltage threshold of 3.9 V, an over-voltage threshold of 4.18 V, and a reset delay time of 560 ms. It consumes a typical operating current of 10 uA and functions across a temperature range of -40°C to +105°C in a SOT-23-3 package.

Supervisors Feature Summary

• Generates automatic reset pulses upon power-up or voltage out-of-tolerance events
• Provides precise monitoring for both under-voltage and over-voltage conditions
• Features active low push-pull output for direct interface with digital logic

Supervisors Applications

• Microcontroller system supervision
• Portable electronic devices requiring low power monitoring
• Battery-powered equipment voltage tracking

Supervisors Procurement Notes

Verify component authenticity through authorized distributors as the FM809 series may have legacy status. Confirm RoHS compliance details and specific suffix requirements against current datasheets. Check for obsolescence notices from onsemi prior to procurement planning.

Supervisors Selection Notes

Select this component for applications requiring simultaneous under-voltage and over-voltage detection in a compact 3-pin package. Ensure the fixed threshold voltages align with the target system's nominal supply levels. Consider the 560 ms reset delay timing relative to the microcontroller startup requirements.

Supervisors Part Context

The FM809RP3X belongs to the FM809 family of 3-pin supervisor circuits originally developed by Fairchild Semiconductor. Following the acquisition, these products are managed under the onsemi portfolio. This series provides essential power management protection for embedded systems in a minimal footprint.

Supervisors Replacement Considerations

Consult official cross-reference tools for parametrically similar parts. Verify pinout compatibility and threshold voltage matches before substituting.