CAT811STBI-GT3

Supervisors Overview

The CAT811STBI-GT3 is a microprocessor power supply supervisor manufactured by onsemi, designed to monitor voltage rails in embedded systems. It features an active LOW push-pull reset output and includes a manual reset input for system control. The device operates within an industrial temperature range of -40°C to +85°C and supports a maximum supply voltage of 5.5V with a minimum operating voltage of 1.2V. Key electrical parameters include a typical reset delay time of 240 ms and a quiescent current of 6 µA. It is housed in a compact SOT-143-4 surface-mount package.

Supervisors Feature Summary

• Provides precise monitoring of standard power supply voltages including +5.0 V, +3.3 V, +3.0 V, and +2.5 V configurations.
• Integrates a manual reset input allowing external control over the reset state for system initialization or recovery.
• Delivers an active LOW reset signal via a push-pull output structure, ensuring robust drive capability.
• Maintains low power consumption with a supply current of 6 µA, suitable for battery-operated applications.

Supervisors Applications

• Computers and server infrastructure
• Wireless communications equipment
• Embedded control systems
• Portable handheld devices and PDAs

Supervisors Procurement Notes

Verify the specific suffix GT3 confirms the lead-free and RoHS-compliant packaging configuration as specified by onsemi. Confirm the SOT-143-4 package variant matches your PCB footprint requirements. Ensure the active LOW output polarity aligns with your target microprocessor reset pin logic. Validate that the 240 ms reset delay meets your system startup timing constraints.

Supervisors Selection Notes

Select this component when an active LOW reset signal is required for voltage supervision. The inclusion of a manual reset input distinguishes it from simpler supervisors lacking external control. Verify that the 6 µA quiescent current fits your power budget compared to higher-current alternatives. Ensure the SOT-143-4 package is compatible with your assembly process and available board space.

Supervisors Part Context

This part belongs to the CAT811/CAT812 family of supervisory circuits, which serve as direct replacements for legacy MAX811/MAX812 components. The CAT811 series specifically provides active LOW outputs, whereas the CAT812 series offers active HIGH outputs. Both families share similar monitoring capabilities and package options, facilitating drop-in upgrades for existing designs requiring enhanced reliability or updated manufacturing standards.

Supervisors Replacement Considerations

The datasheet identifies the CAT811STBI-GT3 as a direct replacement for the MAX811 in industrial temperature range applications. Designers migrating from Maxim Integrated parts should verify pinout compatibility and ensure the active LOW output logic matches the original design intent without additional inversion circuitry.