CAT809STBI-GT3

Supervisors Overview

The CAT809STBI-GT3 is a single-channel voltage supervisory circuit manufactured by onsemi, designed to monitor power supplies in digital systems. It features an active low, push-pull reset output and operates within a supply voltage range of 1.2 V to 5.5 V. The device provides a fixed threshold voltage of 2.93 V with a reset delay time of 240 ms. It functions reliably down to a VCC level of 1.0 V and maintains correct output states during power supply transients. 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

• Provides precise monitoring for standard power supply voltages including +5.0 V, +3.3 V, +3.0 V, and +2.5 V systems.
• Features a push-pull active low reset output configuration for direct drive capability.
• Ensures reset validity down to a minimum supply voltage of 1.0 V.
• Includes immunity to power supply transients to prevent false triggering.

Supervisors Applications

• Computers and servers
• Wireless communications equipment
• Embedded control systems

Supervisors Procurement Notes

Verify the specific threshold voltage variant required for the application, as the CAT809 series offers multiple fixed options. Confirm that the active low push-pull output aligns with the target microprocessor reset input requirements. Ensure the SOT-23-3 package footprint matches the PCB design constraints. Check current availability status as distribution channels may vary.

Supervisors Selection Notes

Select this component when a reliable, low-current supervisor is needed for industrial temperature environments. The push-pull output eliminates the need for external pull-up resistors compared to open-drain alternatives. Consider the 240 ms reset delay to ensure adequate power-up stability for the connected logic. Verify compatibility with the system's minimum operating voltage of 1.0 V.

Supervisors Part Context

This part belongs to the CAT809 family of microprocessor power supply supervisors from onsemi. It serves as a direct replacement for legacy MAX809 devices in industrial applications. The family includes variants with different output polarities and thresholds, such as the CAT803 (open-drain) and CAT810 (active high). All share similar transient immunity and low standby current characteristics.

Supervisors Replacement Considerations

The CAT809STBI-GT3 is documented as a direct replacement for the MAX809 in industrial temperature range applications. Verify pinout compatibility and electrical specifications against existing designs before substitution.