CAT809RTBI-GT3

Supervisors Overview

The CAT809RTBI-GT3 is a single-channel voltage supervisory circuit manufactured by onsemi, designed to monitor power supply voltages in digital systems. It operates within a supply voltage range of 1.2 V to 5.5 V and features a fixed reset threshold voltage of 2.63 V. The device provides an active-low, push-pull reset output with a typical reset delay time of 240 ms and a minimum timeout of 140 ms to ignore fast transients. Packaged in a compact SOT-23-3 surface-mount format, it supports industrial temperature ranges from -40°C to +85°C.

Supervisors Feature Summary

• Provides active-low push-pull reset signal generation when monitored voltage drops below the specified threshold.
• Includes internal reset timeout circuitry to ensure proper reset assertion during power-up events.
• Operates reliably at low supply voltages down to 1.2 V with guaranteed correct output states.

Supervisors Applications

• Desktop computer power supply monitoring
• Portable battery-powered equipment supervision
• Test and measurement instrument voltage oversight

Supervisors Procurement Notes

Verify component authenticity through authorized distribution channels due to potential availability constraints. Confirm package marking codes match official specifications for the SOT-23-3 variant. Ensure design compatibility with existing PCB footprints and thermal requirements before integration into production workflows.

Supervisors Selection Notes

Select this component for applications requiring a fixed 2.63 V threshold with active-low output logic. Consider alternative CAT809 variants if different threshold voltages or active-high outputs are needed. Verify that the 240 ms reset delay meets system timing requirements for microprocessor initialization sequences.

Supervisors Part Context

This part belongs to the CAT809 family of microprocessor power supply supervisors. It serves as a direct replacement for legacy MAX809 devices in industrial applications. The RTBI suffix indicates specific threshold and packaging characteristics within the broader product line.

Supervisors Replacement Considerations

CAT809TTBI-T3 offers similar functionality with a 3.15 V threshold. CAT809RTBI-GT10 shares the same electrical characteristics but differs in reel quantity specifications.