CAT809JTBI-T3

Supervisors Overview

The CAT809JTBI-T3 is a microprocessor power supply supervisor from onsemi, designed to monitor voltage levels in digital systems. It features a push-pull active low reset output and operates within an industrial temperature range of -40°C to +85°C. The device monitors a single input with a threshold voltage of 4V and an overvoltage threshold of 4.06V. It supports a maximum supply voltage of 5.5V and a minimum operating voltage of 1.2V. The reset delay time is 240ms, and the quiescent current is 20µA. Packaged in a compact SOT-23-3 surface-mount case, it serves as a direct replacement for legacy MAX809 components.

Supervisors Feature Summary

• Provides precise monitoring of power supplies with a push-pull active low reset output configuration
• Ensures system reliability through power supply transient immunity and reset validity down to low voltages
• Operates reliably across the full industrial temperature range without requiring manual reset or watchdog functions

Supervisors Applications

• Computers and servers
• Wireless communications equipment
• Embedded control systems

Supervisors Procurement Notes

Verify the exact suffix against official catalogs, as variations like GT3 may indicate specific tape-and-reel packaging or RoHS compliance details not explicitly defined by the base model alone. Confirm availability status, as some variants in this series are marked as obsolete or end-of-life. Ensure the sourcing channel provides genuine onsemi products with valid traceability documentation to guarantee performance specifications match the datasheet requirements.

Supervisors Selection Notes

Select this component when a push-pull active low reset signal is required for monitoring a 4V rail. It is suitable for designs needing direct compatibility with MAX809 pinouts and functionality. Consider the low quiescent current for battery-operated applications. Verify that the SOT-23-3 package dimensions fit the PCB layout constraints. Ensure the operating voltage range covers the system's minimum and maximum supply conditions.

Supervisors Part Context

This part belongs to the CAT809 family of supervisory circuits from onsemi, which also includes open-drain and active-high variants. These devices are engineered to replace older MAX803/MAX809/MAX810 generations while offering improved performance in industrial environments. The family focuses on providing reliable power management supervision for sensitive digital logic and microprocessors in compact form factors.

Supervisors Replacement Considerations

The datasheet identifies the CAT809 series as a direct replacement for the Maxim MAX809 in industrial temperature applications. When substituting, ensure the reset polarity (active low) and output type (push-pull) match the original design requirements. Verify that the threshold voltage and reset delay times are compatible with the target system's timing constraints.