MAX6348UR40-T

Overview

The MAX6348UR40-T is a 3-pin, ultra-low-power microprocessor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It monitors a single power-supply input with a fixed reset threshold voltage of 4.0V. The device features an active-low, open-drain reset output and provides a typical reset delay time of 280 ms. It operates within a supply voltage range up to 5.5 V and consumes only 500 nA of quiescent current. The component is available in SOT-23-3 and SC-70 packages, supporting surface-mount installation across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Ultra-low power consumption with 500 nA operating current
• Fixed 4.0V factory-set reset threshold for precise monitoring
• Active-low open-drain reset output configuration
• Compact 3-pin SOT-23-3 or SC-70 package design

Applications

• Portable battery-powered electronic devices
• Embedded systems requiring low standby current
• Microprocessor power supply supervision
• Consumer electronics with strict power constraints

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm the '40' designation corresponds to the 4.0V threshold variant. Ensure compatibility with SOT-23-3 footprint requirements. Check for lead-free compliance if RoHS standards are mandatory for your assembly process. Validate that the active-low open-drain output aligns with your system's logic interface needs.

Selection Notes

Select this component when a fixed 4.0V threshold is required without external resistor networks. Choose the MAX6348UR40-T over adjustable variants if board space is limited and a specific voltage level is sufficient. Consider the 500 nA current draw for applications where battery life is critical. Ensure the 280 ms timeout meets the startup requirements of the monitored microprocessor or memory device.

Part Context

The MAX6348 series belongs to Maxim Integrated's family of ultra-low-power reset circuits designed for portable applications. These devices eliminate the need for external components by integrating fixed thresholds and timers. The UR40 variant specifically targets systems requiring a 4.0V supervision level, offering a compact alternative to larger supervisor ICs while maintaining high accuracy and low power dissipation.

Replacement Considerations

Direct substitutes include other MAX6348 variants with different threshold voltages, such as MAX6348UR34+T (3.4V) or MAX6348UR46+T (4.6V), provided the threshold matches the application requirement. Cross-reference with MAX6326-MAX6348 datasheet for pin-compatible alternatives within the same package.