MAX6348UR42-T

Overview

The MAX6348UR42-T is a voltage supervisory circuit manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates within a supply voltage range of up to 5.5 V and features a fixed threshold voltage of 4.20 V for monitoring input lines. The device provides an active low, open-drain output signal with a reset delay time of 280 ms. It is designed for surface-mount installation in SOT-23-3 packages. The component functions without manual reset or watchdog timer capabilities, drawing a typical operating current of 500 nA. It supports operation across temperatures from -40°C to +85°C.

Feature Summary

• Provides precise voltage supervision with a fixed 4.20 V threshold for reliable system monitoring
• Features ultra-low power consumption suitable for battery-operated applications
• Delivers active low open-drain reset signals with defined timing delays

Applications

• Microprocessor reset circuits requiring fixed voltage thresholds
• Battery-powered portable devices needing low standby current
• Embedded systems requiring voltage supervision during power-up and power-down sequences

Procurement Notes

Verify the specific suffix UR42 to confirm the 4.20 V threshold variant, as the MAX6348 series offers multiple threshold options. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the SOT-23-3 package footprint matches your PCB design constraints. Check for obsolescence notices as this component may have limited availability compared to newer generations.

Selection Notes

Select this part when a fixed 4.20 V supervision level is required without adjustable thresholds. Consider the 500 nA quiescent current if power efficiency is critical. The open-drain output requires an external pull-up resistor; ensure your design accommodates this interface requirement. Verify that the 280 ms reset delay aligns with your system's startup timing requirements.

Part Context

The MAX6348 series belongs to Analog Devices' uPower supervisor family, designed for low-voltage digital systems. These components integrate voltage monitoring functions into compact packages to save board space. The MAX6348UR42-T specifically targets applications where a stable 4.20 V reference is needed for logic level supervision.

Replacement Considerations

Other MAX6348 variants with different suffixes offer alternative threshold voltages such as 2.5 V, 3.0 V, 3.3 V, or 5.0 V. Direct pin-compatible substitutes may exist within the same series but must match the 4.20 V threshold specification exactly.