CAT1021WI-42-GT3

Supervisors Overview

The CAT1021WI-42-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 5.5 V and features a threshold voltage of 4.2 V. The device includes a manual reset function and a watchdog timer. It is housed in an SOIC-8 surface-mount package and supports operation temperatures from -40°C to +85°C. The typical operating supply current is 3 mA, with a maximum power dissipation of 1 W.

Supervisors Feature Summary

• Integrates voltage supervision with a built-in watchdog timer for enhanced system reliability.
• Supports manual reset functionality to allow user-initiated system recovery.
• Provides single-input monitoring capability for critical power rails.

Supervisors Applications

• CPU power supply monitoring
• Embedded system voltage supervision
• Industrial control unit protection

Supervisors Procurement Notes

Verify the exact suffix GT3 against official datasheets to confirm reel packaging specifications. Confirm RoHS compliance status through manufacturer documentation. Check for end-of-life notices as availability may be restricted. Ensure the SOIC-8 footprint matches your PCB design requirements before procurement.

Supervisors Selection Notes

Select this component when a combined voltage supervisor and watchdog timer are required in a compact SOIC-8 package. The 4.2 V threshold suits systems requiring precise monitoring near standard 5 V logic levels. Consider the 3 mA quiescent current for power-sensitive designs. Verify that the manual reset pin is utilized in the target application architecture.

Supervisors Part Context

This part belongs to the CAT1021 series of supervisory circuits from onsemi. The series typically integrates voltage monitoring and watchdog functions in small packages. The WI-42 designation indicates specific threshold voltages and package type variations within the broader product family.

Supervisors Replacement Considerations

Consult official cross-reference lists for verified substitutes. Generic equivalents may differ in watchdog timing or reset delay characteristics. Verify pin compatibility and threshold voltage accuracy before substitution.