CAX809RTBI-T3

Supervisors Overview

The CAX809RTBI-T3 is a microprocessor power supply supervisor from onsemi, designed to monitor digital system voltages. It operates within a supply voltage range of 1.2 V to 5.5 V and features an active low, push-pull reset output. The device provides a fixed reset threshold voltage of 2.63 V with a typical reset delay time of 240 ms. Packaged in a compact SOT-23-3 surface-mount format, it supports industrial temperature ranges from -40 °C to +85 °C. This component ensures reliable system initialization by detecting under-voltage conditions without requiring manual reset or watchdog timer functionality.

Supervisors Feature Summary

• Monitors single power supply rail for under-voltage events
• Generates active low reset signal via push-pull output
• Operates at low quiescent current for energy efficiency
• Immune to power supply transients during startup

Supervisors Applications

• Microprocessor power supply supervision
• Digital system voltage monitoring
• Industrial control systems
• Consumer electronics power management

Supervisors Procurement Notes

Verify the exact suffix RTBI corresponds to the 2.63 V threshold variant when ordering. Confirm package type is SOT-23-3. Check current lifecycle status as some CAT809 variants may be obsolete. Ensure compatibility with your system's voltage levels and temperature requirements before procurement.

Supervisors Selection Notes

Select this part if a 2.63 V threshold is required for 3.3 V or 5 V systems. Compare with CAT809TTBI-T3 (3.0 V) or CAT809LTBI (2.63 V but different package/revision). Consider CAX809 series for multi-channel needs. Verify operating voltage range matches application. Check thermal performance for enclosed spaces.

Supervisors Part Context

Part of the CAT809/CAX809 family of voltage supervisors. Similar to MAX809 for pin compatibility. Uses floating gate technology for precise threshold control. Part of onsemi's PMIC portfolio. Designed for cost-sensitive applications requiring reliable reset generation.

Supervisors Replacement Considerations

CAT809LTBI-GT3 offers similar 2.63 V threshold in SOT-23-3. CAT809TTBI-T3 provides 3.0 V threshold. MAX809CSA is a legacy equivalent. Verify electrical parameters match exactly before substitution.