CAT809RTBI-T3

Supervisors Overview

The CAT809RTBI-T3 is a microprocessor power supply supervisor manufactured by onsemi. It monitors a single voltage channel with a fixed reset threshold of 2.63V. The device features an active low, push-pull output and operates within a supply voltage range of 1.2V to 5.5V. It provides a reset delay time of 240ms and functions in temperatures from -40°C to +85°C. Packaged in a compact SOT-23-3 surface-mount case, it draws 15µA of operating current.

Supervisors Feature Summary

• Generates a reset signal when the monitored supply voltage drops below the preset threshold level.
• Features an active low, push-pull output structure for direct interface with digital logic.
• Ignores fast transients on the power supply line to prevent false resets.
• Maintains correct output state at supply voltages as low as 1.0V.

Supervisors Applications

• Monitoring power supplies in industrial temperature range applications
• Providing power-on reset signals for microprocessor systems
• Supporting +2.5V and +3.3V system architectures

Supervisors Procurement Notes

Verify the specific suffix against official documentation, as 'T3' may indicate tape-and-reel packaging or a specific variant distinct from the widely documented 'GT3'. Confirm availability status, as some CAT809 variants are marked as obsolete or end-of-life. Ensure the component matches the required 2.63V threshold and SOT-23-3 package dimensions for your design.

Supervisors Selection Notes

Select this component for designs requiring a fixed 2.63V supervision threshold with an active low output. It serves as a direct replacement for MAX809 equivalents in industrial environments. Consider the 240ms reset delay and 15µA quiescent current when evaluating system power budgets and startup timing requirements.

Supervisors Part Context

The CAT809 series comprises 3-pin microprocessor power supply supervisors designed to monitor digital system voltages. These devices generate reset signals when supply voltages fall below preset thresholds. The series supports various industry-standard thresholds for +5.0V, +3.3V, +3.0V, and +2.5V systems, offering flexibility for different logic families.

Supervisors Replacement Considerations

Public confirmed substitute part numbers: ADM6326-31ARTZ-R7 (Analog Devices Inc.). Verify pinout compatibility and threshold voltage alignment before substitution.

Supervisors FAQ

What is the reset delay time for the CAT809RTBI-T3?

The reset delay time is 240 ms.

Does the CAT809RTBI-T3 include a manual reset input?

No, the device does not feature a manual reset input.

What is the maximum operating supply voltage?

The maximum operating supply voltage is 5.5 V.