CAT811LTBI-T3

Supervisors Overview

The CAT811LTBI-T3 is a voltage supervisory circuit manufactured by onsemi, designed to monitor power supply integrity in electronic systems. It operates within a supply voltage range of 1.2 V to 5.5 V and features a specific under-voltage threshold of 4.63 V with an over-voltage threshold of 4.7 V. The device provides an active low, push-pull reset output with a fixed reset delay time of 240 ms. It supports manual reset functionality and consumes a typical operating supply current of 8 uA. Packaged in a compact SOT-143-4 surface-mount case, it functions without a watchdog timer or battery backup switch. The component is rated for operation across a temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Provides precise voltage supervision with dedicated under-voltage and over-voltage detection thresholds
• Features an active low push-pull output driver for direct interface with digital logic
• Includes manual reset input capability for system control flexibility
• Operates with ultra-low quiescent current consumption suitable for power-sensitive designs

Supervisors Applications

• Microprocessor power supply monitoring
• Portable equipment voltage supervision
• Battery-operated system protection
• Industrial control board reset generation

Supervisors Procurement Notes

Verify the exact suffix configuration as datasheet variations exist for this series. Confirm availability status as some variants are marked obsolete. Ensure the ordering part number matches the required threshold voltage and package type. Check RoHS compliance documentation for specific manufacturing dates. Validate that the supplier source is authorized to guarantee component authenticity.

Supervisors Selection Notes

Select this component when a 4.63 V threshold is specifically required for 5 V or 3.3 V rail monitoring. Compare against other CAT811 variants if different voltage thresholds or active high outputs are needed. Consider the SOT-143-4 footprint constraints during PCB layout. Evaluate the 240 ms delay against system startup timing requirements. Verify that the manual reset pin is utilized in the design architecture.

Supervisors Part Context

This part belongs to the CAT811 family of microprocessor supervisors from onsemi. The family includes variants with different voltage thresholds and output polarities. Similar parts include the CAT811STBI-GT3 and CAT811LTBI-GT3, which share the same package and basic functionality but may differ in specific threshold values or packaging formats. The series is designed for general-purpose power management applications.

Supervisors Replacement Considerations

Direct substitutes include CAT811LTBI-GT3 and CAT811LTBI-T10, which share identical electrical specifications and pinouts. Verify that any replacement maintains the 4.63 V threshold and active low output characteristics. Ensure the alternative part is available in the SOT-143-4 package. Cross-reference datasheets to confirm matching reset delay times and operating temperature ranges.