MCP121-270E/TO

Supervisors Overview

The MCP121-270E/TO is a micropower voltage supervisor manufactured by Microchip Technology, designed to monitor system power integrity. It operates within a supply voltage range of 1 V to 5.5 V and features a typical threshold voltage of 2.63 V. The device provides an active-low open-drain reset output with a typical reset delay time of 120 ms. It is available in the TO-92-3 through-hole package and supports extended operating temperatures from -40°C to +125°C. The component draws a maximum steady-state supply current of 1.75 µA.

Supervisors Feature Summary

• Ultra-low supply current consumption for efficient power management
• Precision voltage monitoring with fixed threshold options
• Active-low open-drain reset output for microcontroller protection

Supervisors Applications

• Microcontroller reset circuits in battery-powered devices
• Power loss detection in portable electronics
• Voltage supervision in industrial control systems

Supervisors Procurement Notes

Verify the specific suffix 'E' indicates RoHS compliance and lead-free packaging status according to the manufacturer's current documentation. Confirm the 'TO' suffix corresponds to the TO-92-3 through-hole package variant. Ensure the part number matches the exact threshold voltage requirement of 2.63 V for your application design.

Supervisors Selection Notes

Select this component when a through-hole solution is required for voltage supervision with low quiescent current. The MCP121 series offers multiple threshold voltages; ensure the 2.63 V option aligns with the monitored rail. Consider the open-drain output configuration for compatibility with the target logic levels and pull-up requirements.

Supervisors Part Context

This part belongs to the MCP102/103/121/131 family of micropower voltage supervisors. The MCP121 variant specifically provides an active-low open-drain output, distinguishing it from push-pull or internal pull-up variants within the same family. It is engineered for applications requiring reliable reset generation under low-power conditions.

Supervisors Replacement Considerations

Compatible substitutes include other MCP121 variants with different threshold voltages (e.g., MCP121-232E/TO) if the voltage level can be adjusted. Cross-referencing with MCP111 or MCP131 series parts requires verifying output type compatibility, as MCP131 includes an internal pull-up resistor.