CAT803MTBI-GT3

Supervisors Overview

The CAT803MTBI-GT3 is a microprocessor power supply supervisory circuit manufactured by onsemi. It monitors system voltages and generates a reset signal when the supply drops below a specific threshold. The device features an open-drain active-low output, ensuring compatibility with various logic families. It operates within a voltage range of 1.2 V to 5.5 V and includes a fixed reset delay time of 240 ms. The component is designed for industrial temperature applications, functioning reliably between -40°C and +85°C. It consumes a typical quiescent current of 6 µA, making it suitable for low-power designs. The part is housed in a compact SOT-23-3 surface-mount package.

Supervisors Feature Summary

• Provides precise monitoring of standard digital system power supplies including +5.0 V, +3.3 V, +3.0 V, and +2.5 V rails.
• Features an open-drain active-low reset output configuration for flexible interfacing with microprocessors and logic circuits.
• Ensures reset validity down to a minimum supply voltage of 1.0 V, maintaining system integrity during brown-out conditions.

Supervisors Applications

• Computers and server systems requiring reliable power supervision
• Wireless communication devices needing stable voltage monitoring
• Embedded control systems in industrial environments
• Portable handheld equipment and PDAs

Supervisors Procurement Notes

Verify the exact threshold voltage variant required, as the CAT803 series offers multiple options for different supply rails. Confirm that the open-drain output architecture aligns with the target system's pull-up requirements. Ensure the SOT-23-3 package footprint matches the PCB design constraints. Check for any specific RoHS compliance documentation if required by regional regulations.

Supervisors Selection Notes

Select this component when an active-low reset signal with an open-drain interface is necessary for the application. It is appropriate for systems operating within the 1.2 V to 5.5 V range where low standby current is critical. Consider the 240 ms reset delay to ensure adequate power stabilization time before system initialization. Verify that the industrial temperature range meets the environmental specifications of the end product.

Supervisors Part Context

The CAT803MTBI-GT3 belongs to the CAT803/CAT809/CAT810 family of supervisory circuits from onsemi. These devices are direct replacements for the MAX803, MAX809, and MAX810 in industrial temperature applications. While the CAT809 offers a push-pull active-low output and the CAT810 provides a push-pull active-high output, the CAT803 specifically utilizes an open-drain active-low configuration. This family is designed to monitor power supplies in digital systems with high transient immunity.

Supervisors Replacement Considerations

The CAT803MTBI-GT3 is a direct replacement for the MAX803 in industrial temperature range applications. When substituting, ensure the target system supports open-drain outputs and has the necessary pull-up resistor. Verify that the reset delay characteristics of the existing component are compatible with the 240 ms delay of the CAT803 series.