CAT809MTBI-GT3

Supervisors Overview

The CAT809MTBI-GT3 is a voltage supervisory circuit manufactured by onsemi, designed to monitor power supply voltages in digital systems. It operates within a supply voltage range of 1.2 V to 5.5 V and features a fixed reset threshold voltage of 4.38 V with an overvoltage threshold of 4.45 V. The device provides an active low, push-pull output signal with a typical reset delay time of 240 ms. It consumes a maximum operating supply current of 20 uA and dissipates up to 320 mW. The component is housed in a SOT-23-3 package and is rated for operation between -40°C and +85°C.

Supervisors Feature Summary

• Provides active low push-pull reset output for reliable logic interfacing
• Monitors single input voltage with fixed threshold detection
• Operates across industrial temperature range without manual reset requirement

Supervisors Applications

• Microprocessor power supply monitoring
• Digital system voltage supervision
• Industrial control unit power integrity checks

Supervisors Procurement Notes

Verify the specific suffix MTBI corresponds to the required 4.38 V threshold voltage before ordering. Confirm the SOT-23-3 package compatibility with your PCB footprint. Check current lifecycle status as obsolescence notices may affect long-term availability. Ensure the active low output polarity matches your system design requirements.

Supervisors Selection Notes

Select this component when a fixed 4.38 V threshold is required for 5 V or 3.3 V system monitoring. Compare quiescent current specifications against other supervisory circuits if battery life is critical. Verify that the 240 ms reset delay meets your microcontroller startup timing constraints. Ensure the operating voltage range covers your minimum system voltage during brown-out conditions.

Supervisors Part Context

This part belongs to the CAT809 series of voltage supervisors from onsemi. The series offers various threshold options to support standard logic families. The CAT809 variant specifically provides an active low output, distinguishing it from the CAT810 which offers active high outputs. These devices are commonly used as direct replacements for legacy MAX809 components in industrial applications.

Supervisors Replacement Considerations

Direct functional equivalents include the MAX809 series. Verify pinout compatibility and threshold voltage accuracy when substituting. Check if alternative packages like SC-70 are available if space constraints change.