CAT853LTBI-T3

Supervisors Overview

The CAT853LTBI-T3 is a microprocessor power supply supervisor manufactured by onsemi, designed to monitor voltage levels in electronic systems. It operates within a supply voltage range of 1.2 V to 5.5 V and features a fixed reset threshold voltage of 4.75 V. The device provides an active-low open-drain reset output with a typical reset delay time of 140 ms. It is housed in a compact SOT-23-3 surface-mount package and supports operation across an extended temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Monitors single power supply rail for undervoltage conditions
• Provides active-low open-drain reset signal upon fault detection
• Operates without manual reset or watchdog timer functionality

Supervisors Applications

• Microprocessor power supply supervision
• Embedded system voltage monitoring
• Portable electronics power management

Supervisors Procurement Notes

Verify component authenticity through authorized distributors due to obsolete status. Confirm RoHS compliance documentation availability prior to integration. Check lead time constraints as production may be discontinued. Validate package marking codes against official datasheet specifications to prevent counterfeit substitution during procurement processes.

Supervisors Selection Notes

Select this supervisor when a fixed 4.75 V threshold is required for 5 V logic systems. Consider the 140 ms reset delay for timing-sensitive applications. Evaluate SOT-23-3 footprint compatibility against PCB layout constraints. Compare against CAT803 series if lower thresholds or different reset delays are needed for alternative voltage rails.

Supervisors Part Context

Part of the CAT853 family of voltage supervisors from onsemi, sharing architectural similarities with CAT803 and CAT859 series. Designed for low-power embedded applications requiring reliable power-fail detection. The LTBI suffix indicates specific threshold voltage and package configuration within the broader supervisory circuit portfolio.

Supervisors Replacement Considerations

CAT853STBI-T3 offers similar functionality with potentially different threshold options. CAT803LTBI-T3 provides comparable supervision with varied reset delay characteristics. Verify pinout compatibility and electrical parameter alignment before substituting these alternatives in existing designs.