CAT803RTBI-GT3

Supervisors Overview

The CAT803RTBI-GT3 is a voltage supervisory circuit from onsemi designed for monitoring digital system power supplies. It features an open-drain active-low reset output and supports threshold voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The device operates within a supply voltage range of 1.2 V to 5.5 V and includes a reset delay time of 240 ms. It functions in the industrial temperature range of -40°C to +85°C with a maximum power dissipation of 320 mW and a quiescent current of 15 µA.

Supervisors Feature Summary

• Provides precise monitoring of standard power supply rails including 5.0 V, 3.3 V, 3.0 V, and 2.5 V systems.
• Generates an active-low reset signal via an open-drain output when supply voltage drops below the selected threshold.
• Ensures reset validity down to a minimum supply voltage of 1.0 V while maintaining correct output states.

Supervisors Applications

• Computers and servers
• Wireless communications equipment
• Embedded control systems
• White goods and power meters

Supervisors Procurement Notes

Verify the specific threshold voltage variant required, as the RTBI suffix corresponds to a fixed 2.63 V threshold within the broader CAT803 family specifications. Confirm that the open-drain active-low output configuration aligns with the target microprocessor reset input requirements. Ensure the SOT-23-3 package dimensions fit the designated PCB footprint. Check for any lead-free or RoHS compliance documentation if required by the manufacturing facility standards.

Supervisors Selection Notes

Select this component when a low-power, single-input voltage supervisor with an open-drain output is needed for industrial applications. It serves as a direct replacement for legacy MAX803 devices in systems operating over the industrial temperature range. Consider the 240 ms reset delay and 15 µA quiescent current when designing for power-sensitive or timing-critical circuits. Ensure the monitored rail falls within the 1.2 V to 5.5 V operational window.

Supervisors Part Context

The CAT803RTBI-GT3 belongs to the CAT803 series of microprocessor power supply supervisors manufactured by onsemi. This series is engineered to monitor power supplies in digital systems and offers precision monitoring for common voltage levels. The device is part of a family that also includes variants with push-pull outputs, such as the CAT809 and CAT810, providing flexibility for different reset interface requirements.

Supervisors Replacement Considerations

• MAX803