CAT1161WI-25

Supervisors Overview

The CAT1161WI-25 is a supervisory circuit manufactured by onsemi, designed for microcontroller-based systems. It integrates a 16K serial CMOS EEPROM with hardware write protection, a precision reset controller, and a watchdog timer within a single low-power CMOS device. The component operates within a supply voltage range of 2.7 V to 6 V. It features a specific under-voltage threshold of 2.5 V and an over-voltage threshold of 2.7 V. The reset delay time is specified at 270 ms. The device supports manual reset functionality and utilizes an I2C bus interface for memory access. It is available in an SOIC-8 surface-mount package and functions across an operating temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates 16K serial EEPROM with hardware write protection alongside power supervision
• Includes a watchdog timer that monitors the SDA line to detect system hangs
• Provides precise brown-out protection with configurable reset timing

Supervisors Applications

• Microcontroller-based embedded systems requiring data retention
• Industrial control units needing reliable power supervision
• Consumer electronics with limited board space constraints

Supervisors Procurement Notes

Verify the exact suffix designation, as the base model CAT1161WI-25 typically requires a trailing character (e.g., G, T3) to specify packaging or revision status. Confirm availability status, as this series may be discontinued or subject to last-time buy restrictions. Ensure the selected variant matches the required package type and thermal specifications for the target application environment.

Supervisors Selection Notes

Select this component when a combined solution for non-volatile storage and power monitoring is required. Compare against the CAT1162 series if the integrated watchdog timer feature is not necessary for the design. Verify that the I2C address and voltage thresholds align with the system's power rail characteristics. Consider the SOIC-8 footprint compatibility during PCB layout planning.

Supervisors Part Context

This part belongs to the CAT1161/2 family of supervisory circuits produced by onsemi. These devices are engineered to simplify system design by consolidating memory, reset generation, and watchdog functions into one IC. The family differentiates between models with and without watchdog timers, offering flexibility for various cost and feature requirements in portable and industrial applications.

Supervisors Replacement Considerations

Direct substitutes include other CAT1161 variants with adjusted voltage thresholds or packaging suffixes. Cross-reference with CAT1162 models if the watchdog function is redundant. Verify pinout compatibility before replacing with generic supervisor ICs.