CAT1161WI-28-GT3

Supervisors Overview

The CAT1161WI-28-GT3 is a voltage supervisory circuit manufactured by onsemi, designed for CPU monitoring applications. It operates within a supply voltage range of 2.7 V to 6 V and features a threshold voltage of 2.8 V with an overvoltage threshold of 3 V. The device includes a manual reset input and a watchdog timer, providing a reset delay time of 270 ms. It draws a working supply current of 3 mA and dissipates up to 1 W of power. The component supports active high, active low, and open drain output types without battery backup or chip enable signals. It is housed in an SOIC-8 surface-mount package and functions reliably across an operating temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates a watchdog timer for system stability monitoring alongside voltage supervision capabilities.
• Provides flexible output configurations including active high, active low, and open drain options.
• Supports manual reset functionality to allow user-initiated system recovery.

Supervisors Applications

• CPU voltage supervision in embedded systems
• Watchdog timer implementation for microcontroller protection
• Manual reset circuit integration in industrial control units

Supervisors Procurement Notes

Verify the specific suffix GT3 confirms the tape-and-reel packaging format required for automated assembly processes. Confirm that the 28 designation accurately reflects the 2.8 V threshold voltage needed for the target supply rail. Ensure compatibility with the SOIC-8 footprint during PCB layout finalization. Check for any recent product change notifications regarding material composition or manufacturing site changes.

Supervisors Selection Notes

Select this component when a combined voltage supervisor and watchdog timer is required in a single package. The 2.8 V threshold suits systems powered by 3 V rails. Consider the 270 ms reset delay for startup timing requirements. Evaluate the 3 mA supply current against total system power budgets. Verify that the SOIC-8 package fits within the available board space constraints.

Supervisors Part Context

This part belongs to the CAT1161 series of supervisory circuits from onsemi. The series typically integrates voltage monitoring with additional features like watchdog timers. Variants in the family differ by package type, such as PDIP or SOIC, and threshold voltage settings. The WI-28-GT3 specifically denotes the surface-mount SOIC-8 version with a 2.8 V threshold in reel packaging.

Supervisors Replacement Considerations

Check for CAT1161LI-28-G for through-hole DIP-8 alternatives. Consider CAT1163WI-28-G for similar SMD specifications. Verify electrical compatibility before substituting with other onsemi supervisory ICs.