CAT1021ZI-42-G

Supervisors Overview

The CAT1021ZI-42-G 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 an under-voltage threshold of 4.25 V and an over-voltage threshold of 4.5 V. Key functional blocks include a manual reset input and a watchdog timer. It draws a typical operating supply current of 3 mA and supports a power dissipation of 1 W. The component is housed in an MSOP-8 surface-mount package and functions reliably across an industrial temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates a watchdog timer for system stability monitoring
• Supports manual reset functionality via dedicated input
• Provides precise voltage supervision with defined under-voltage and over-voltage thresholds

Supervisors Applications

• CPU voltage monitoring in embedded systems
• Industrial control unit power supervision
• Consumer electronics power management circuits

Supervisors Procurement Notes

Verify the specific suffix G for RoHS compliance status against the latest manufacturer documentation. Confirm the MSOP-8 package dimensions match your PCB footprint requirements. Ensure the 4.2 V threshold aligns with your target supply rail. Check for any recent product change notices regarding manufacturing location or material composition updates before finalizing procurement.

Supervisors Selection Notes

Select this component when a combined supervisor and watchdog solution is required in a compact surface-mount package. The 4.2 V threshold suits 5 V logic systems. Verify that the 3 mA quiescent current fits your power budget. Consider the manual reset pin availability if user intervention is needed. Compare against other CAT1021 variants if different packages or thresholds are preferred.

Supervisors Part Context

This part belongs to the CAT1021 series of supervisory circuits from onsemi. The series offers various threshold voltages and packaging options. The ZI suffix indicates the MSOP-8 package type. The 42 designation specifies the 4.2 V threshold voltage. The G suffix typically denotes environmental compliance. This family targets cost-sensitive applications requiring reliable power management.

Supervisors Replacement Considerations

Check for CAT1021ZI-42 without the G suffix for identical electrical performance but potentially different compliance status. Other CAT1021 variants with different threshold codes may serve as alternatives if voltage levels differ. Verify pin compatibility with SOIC-8 or TSSOP-8 versions if package changes are acceptable.