CAT1161WI45

Supervisors Overview

The CAT1161WI-45 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 fixed threshold voltage of 4.5 V with an overvoltage threshold of 4.75 V. The device includes a manual reset input, a watchdog timer, and provides active high, active low, or open drain output options. It has a reset delay time of 270 ms and consumes 3 mA of operating current. Packaged in an SOIC-8 surface-mount format, it functions reliably across temperatures from -40°C to +85°C.

Supervisors Feature Summary

• Integrates a watchdog timer for system stability monitoring alongside voltage supervision.
• Offers flexible output configurations including active high, active low, and open drain modes.
• Supports manual reset functionality via dedicated input pin.
• Includes integrated non-volatile memory for data retention.

Supervisors Applications

• CPU power supply monitoring in embedded systems
• Voltage supervision for microcontroller units
• Watchdog timer implementation in industrial controllers

Supervisors Procurement Notes

Verify component authenticity through authorized distributors as the part status is discontinued. Confirm package type and suffix codes match design requirements. Check RoHS compliance documentation. Ensure ESD handling procedures are followed during storage and assembly. Validate lead availability with suppliers due to end-of-life status.

Supervisors Selection Notes

Select this component when a fixed 4.5 V threshold is required for single-channel voltage supervision. Consider the SOIC-8 package for surface-mount compatibility. Verify that the 3 mA operating current fits the system power budget. Ensure the 270 ms reset delay aligns with startup timing requirements. Confirm integration with existing I2C EEPROM interfaces if data logging is needed.

Supervisors Part Context

This part belongs to the CAT1161 family of supervisory circuits featuring integrated EEPROM. It shares functional similarities with other variants differing primarily in threshold voltages and packages. The WI suffix indicates wide-body SOIC packaging. The 45 designation specifies the 4.5 V trip point. This series targets cost-sensitive applications requiring combined reset generation and data storage capabilities.

Supervisors Replacement Considerations

CAT1161LI-45-G offers identical electrical specifications in a PDIP-8 through-hole package. CAT1161WI-45-T3 provides the same function in tape-and-reel packaging. Verify pinout compatibility before substitution. Confirm package dimensions fit the PCB footprint. Check manufacturer datasheets for any minor parameter variations between suffixes.