CAT811STBI-T3

Supervisors Overview

The CAT811STBI-T3 is a microprocessor supervisory circuit designed to monitor power supplies within embedded systems. It provides precise monitoring for +5.0 V, +3.3 V, +3.0 V, and +2.5 V rails with specified tolerance levels. The device features an active LOW reset output and includes a manual reset input for system control. It operates reliably down to a supply voltage of 1.0 V with a quiescent current of 6 µA. The component supports industrial temperature ranges from -40°C to +85°C and is housed in a compact SOT-143 package.

Supervisors Feature Summary

• Provides precision monitoring for standard voltage rails including +5.0 V, +3.3 V, +3.0 V, and +2.5 V
• Features an active LOW reset output configuration suitable for low-voltage logic interfaces
• Includes a manual reset input allowing direct user intervention for system restarts
• Ensures power supply transient immunity to maintain stability during electrical noise events

Supervisors Applications

• Computers and server infrastructure
• Wireless communications equipment
• Embedded control systems
• Intelligent instruments and power meters

Supervisors Procurement Notes

Verify the specific threshold voltage variant required, as the base part number covers multiple monitoring levels. Confirm the package finish matches design requirements, as options include Sn or NiPdAu Green Lead finishes. Ensure the active LOW output aligns with the target microprocessor reset pin polarity. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.

Supervisors Selection Notes

Select this component when an active LOW reset signal is required for power supervision. It serves as a direct replacement for legacy MAX811 devices in industrial applications. Consider the 6 µA quiescent current for battery-sensitive designs. Verify that the manual reset feature meets the system's safety and recovery protocols. Ensure the operating voltage range covers the minimum system rail of 1.0 V.

Supervisors Part Context

This component belongs to the CAT811/CAT812 family of microprocessor supervisory circuits manufactured by onsemi. The family distinguishes between active LOW (CAT811) and active HIGH (CAT812) outputs. These devices are engineered to replace older MAX811/MAX812 equivalents while offering improved transient immunity and lower power consumption in a small SOT-143 footprint.

Supervisors Replacement Considerations

The CAT811STBI-T3 is documented as a direct replacement for the MAX811 in industrial temperature range applications. Verify pin compatibility and reset polarity when substituting into existing designs originally using the MAX811.