CAT1021WI45

Supervisors Overview

The CAT1021WI-45-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 4.5 V with an under-voltage threshold of 4.5 V and an over-voltage threshold of 4.75 V. The device includes a manual reset function and a watchdog timer, consuming 3 mA of operating current. It is housed in an SOIC-8 surface-mount package and supports industrial temperature ranges from -40°C to +85°C.

Supervisors Feature Summary

• Integrates voltage supervision with a built-in watchdog timer for comprehensive system protection.
• Supports manual reset functionality to allow user-initiated system recovery.
• Monitors a single input channel for under-voltage and over-voltage conditions.

Supervisors Applications

• CPU power supply monitoring
• Industrial control systems requiring voltage supervision
• Embedded systems with watchdog requirements

Supervisors Procurement Notes

Verify the specific suffix (e.g., -G) to confirm RoHS compliance and lead-free status. Confirm the package type matches the design requirement, as variations exist across the CAT1021 family. Check datasheets for exact electrical characteristics corresponding to the specific threshold voltage variant required for the application.

Supervisors Selection Notes

Select this component when a combined supervisor and EEPROM solution is not needed, focusing purely on voltage monitoring and reset generation. Ensure the 4.5 V threshold aligns with the target system's nominal voltage level. Consider the SOIC-8 package constraints for PCB layout and thermal management during selection.

Supervisors Part Context

This part belongs to the CAT1021 series of supervisory circuits from onsemi. The series offers various threshold voltages and packages, including TSSOP and MSOP options. The WI-45 variant specifically denotes the SOIC-8 package with a 4.5 V threshold, distinguishing it from other series members like the CAT1021PE or CAT1021ZI.

Supervisors Replacement Considerations

Cross-reference with other CAT1021 variants such as CAT1021WI-28-G or CAT1021ZI-45-G if different thresholds or packages are acceptable. Verify pin compatibility and electrical specifications before substituting with non-onsemi equivalents.