MAX6346UR38

Overview

The MAX6346UR38+T is a voltage supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of up to 5.5 V and features a fixed threshold voltage of 3.80 V. The device provides an active low, push-pull reset output with a typical reset delay time of 185 ms. It consumes a maximum operating supply current of 500 nA and maintains an accuracy of 1.5%. The component is housed in a SOT-23-3 package and supports surface mount installation. It functions without manual reset, watchdog timer, or battery backup switching capabilities.

Feature Summary

• Ultra-low power consumption suitable for battery-operated applications
• Fixed factory-set reset threshold voltage for precise monitoring
• Active low push-pull reset output driver
• Compact three-pin SOT-23 surface-mount packaging

Applications

• Portable electronic devices requiring low standby current
• Battery-powered instrumentation systems
• Microprocessor power supply supervision
• Consumer electronics with limited power budgets

Procurement Notes

Verify the specific suffix (+T) indicates tape and reel packaging when ordering. Confirm the exact threshold voltage variant matches the design requirement, as the MAX6346 series offers multiple fixed voltage options. Ensure the SOT-23-3 footprint aligns with the PCB layout. Check RoHS compliance status if required by regional regulations. Validate availability through authorized distributors as lead times may vary.

Selection Notes

Select this component when a fixed 3.80 V threshold is required for system supervision. Consider the 500 nA quiescent current for energy efficiency constraints. The push-pull output eliminates the need for external pull-up resistors. Verify that the 185 ms timeout meets the microcontroller startup requirements. Ensure the operating temperature range covers the intended application environment.

Part Context

The MAX6346 belongs to Maxim's ultra-low-power microprocessor reset circuit family. These devices are designed to monitor single power supplies in portable and battery-operated equipment. The series offers various fixed threshold voltages to accommodate different logic levels. The UR suffix denotes the SC-70/SOT-23 package style optimized for space-constrained designs.

Replacement Considerations

The ADM6346 series serves as a direct functional equivalent from Analog Devices. Other MAX6346 variants with different threshold voltages (e.g., UR38, UR46) share identical pinouts and electrical characteristics except for the trip point. Verify that substitute parts maintain the same push-pull output configuration and package dimensions.