CAT809MTBI-T3

Supervisors Overview

The CAT809MTBI-T3 is a microprocessor power supply supervisor manufactured by 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 4.38 V with a corresponding overvoltage threshold of 4.45 V. It includes a standard reset delay time of 240 ms to ensure stable power-up sequencing. The component is housed in a compact SOT-23-3 surface-mount package and supports an industrial operating temperature range from -40 °C to +85 °C.

Supervisors Feature Summary

• Generates a reset signal when the monitored power supply voltage drops below a preset threshold level
• Provides an active-low push-pull reset output for direct interface with digital logic systems
• Includes a fixed reset delay timer to prevent false resets during power supply ramp-up
• Designed as a direct replacement for legacy MAX809 devices in industrial temperature applications

Supervisors Applications

• Monitoring power supplies in digital systems requiring reliable reset generation
• Industrial control applications operating within the specified temperature range
• Embedded systems utilizing +5.0 V or +3.3 V power rails

Supervisors Procurement Notes

Verify the exact suffix configuration against the manufacturer's current datasheet, as ordering codes determine specific threshold voltages and packaging options. Confirm availability status directly with authorized distributors, as lifecycle changes may affect production schedules. Ensure the selected variant matches the required reset threshold and package type for your specific circuit design constraints.

Supervisors Selection Notes

Select this component when a fixed 4.38 V threshold is required for supervising 5 V or 3.3 V systems. The SOT-23-3 package offers space-efficient mounting for compact designs. Consider the 240 ms reset delay for timing requirements during power-up sequences. Verify that the active-low output polarity aligns with the target microprocessor or logic input specifications.

Supervisors Part Context

The CAT809 series comprises 3-pin microprocessor power supply supervisors used to monitor voltage levels in digital circuits. These devices are engineered to replace older MAX809 equivalents while maintaining compatibility with industrial temperature standards. The series utilizes floating gate technology to provide precise threshold monitoring across various supply voltages.

Supervisors Replacement Considerations

The CAT809MTBI-T3 serves as a direct functional replacement for the Maxim Integrated MAX809 in industrial applications. Designers transitioning from MAX809 should verify pinout compatibility and electrical parameter alignment before implementation.