CAT809JTBI-GT3

Supervisors Overview

The CAT809JTBI-GT3 is a voltage supervisory circuit manufactured by onsemi, designed to monitor power supplies 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 V. The device provides an active low, push-pull output signal with a standard reset delay time of 240 ms. It consumes a typical operating current of 20 uA and supports a maximum power dissipation of 320 mW. The component is housed in a compact SOT-23-3 surface-mount package and is rated for industrial operation across a temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Generates a reset signal when the monitored power supply voltage drops below the preset threshold level.
• Features an active low, push-pull output configuration for direct interface with microprocessor reset pins.
• Includes internal circuitry to ignore fast transients on the power supply line, ensuring stable operation.

Supervisors Applications

• Monitoring power rails in industrial control systems requiring reliable voltage supervision.
• Ensuring system integrity in portable battery-powered devices through low quiescent current consumption.
• Providing power-on reset functionality for embedded processors and digital logic circuits.

Supervisors Procurement Notes

Verify the specific threshold voltage requirement against the datasheet, as the suffix indicates a 4 V threshold. Confirm that the SOT-23-3 package dimensions align with the PCB footprint design. Check the latest manufacturer lifecycle status, as availability may vary due to production schedules. Ensure the operating temperature range meets the environmental conditions of the target application.

Supervisors Selection Notes

Select this component when a fixed 4 V threshold is required for monitoring higher voltage rails within the 5.5 V limit. Consider the 20 uA quiescent current for battery efficiency compared to other options. Evaluate the push-pull output capability if driving loads directly without additional pull-up resistors is necessary. Compare the 240 ms reset delay against the system's startup timing requirements.

Supervisors Part Context

This part belongs to the CAT809 series of simple reset/power supply supervisor circuits from onsemi. These devices are engineered as direct replacements for legacy MAX809 components in industrial applications. The series utilizes floating gate technology to provide precise threshold voltages, ensuring consistent performance across manufacturing batches and temperature variations.

Supervisors Replacement Considerations

The CAT809RTBI-GT3 serves as a functional substitute within the same family but differs in its reset threshold voltage (2.63 V). Verify that the system design can accommodate the lower threshold voltage change before substituting. Other CAT809 variants with different suffixes offer alternative thresholds; ensure the electrical parameters match the specific circuit requirements.