Analog Devices Inc./Maxim Integrated MAX6380UR44-T

Overview

MAX6380UR44-T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for precision power-supply monitoring in battery-powered systems. It features a factory-trimmed 4.38V threshold (±2.5% over temperature), 500nA supply current, and operates from 1.2V to 5.5V VCC - enabling reliable brownout detection in portable medical devices and low-power IoT sensors.

For engineers reviewing the MAX6380UR44-T datasheet, MAX6380UR44-T pinout, MAX6380UR44-T application, or MAX6380UR44-T equivalent, key selection criteria include its open-drain output configuration, 4.38V trip point, SC70/SOT23-3 package compatibility, transient immunity up to 200µs at 100mV overdrive, and guaranteed logic state down to 1V VCC.

Technical Context

The MAX6380UR44-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.38V threshold without external components. Its open-drain output requires an external pull-up and sinks 100µA at 0.4V typical VOL when asserted.

It ignores fast VCC transients - maximum allowable negative glitch duration is 200µs at 100mV overdrive - and maintains valid output logic state across VCC from 1.0V to 5.5V, supporting operation during deep battery discharge and cold-start conditions.

Key Specifications

Pinout & Package

MAX6380UR44-T is supplied in a 3-pin SOT23-3 package (lead-free, tape-and-reel). Pin 1 = GND, Pin 2 = OUT (open-drain, active-low), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6380UR44-T uniquely delivers 4.38V precision detection, 500nA supply current, and open-drain flexibility in a 3-pin SOT23 - making it optimal for space-constrained, long-life battery systems needing exact Li-ion cutoff voltage.

Availability

MAX6380UR44-T is available at Aetrix Electronics and suitable for portable medical sensors, lithium-ion battery protection circuits, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6380UR44-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications markets.

The MAX6375–MAX6380 family was developed specifically for ultra-low-power voltage monitoring in battery-critical systems - prioritizing nanoscale supply current, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the MAX6380UR44-T?

The MAX6380UR44-T has a factory-trimmed nominal reset threshold of 4.38V, with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the R44 suffix variant within the MAX6380 series.

Does the MAX6380UR44-T require an external pull-up resistor on its OUT pin?

Yes, the MAX6380UR44-T features an open-drain active-low output and requires an external pull-up resistor connected between OUT and the target logic supply (up to 5.5V). The datasheet specifies that a 10kΩ resistor is typically sufficient to ensure valid logic-high levels while meeting VOL ≤0.4V at 100µA sink current.

Can the MAX6380UR44-T operate reliably at VCC = 1.2V?

Yes, the MAX6380UR44-T is fully specified to maintain correct output logic state down to VCC = 1.0V, and its functional operating range begins at 1.2V. This enables use in deeply discharged battery scenarios where other detectors may fail to assert reset, ensuring robustness in energy-harvesting and ultra-low-power systems.

What is the propagation delay of the MAX6380UR44-T when VCC falls below threshold?

The MAX6380UR44-T exhibits a typical propagation delay of 9.5µs from VCC crossing the 4.38V threshold to OUT transitioning low. This value is measured under standard conditions (VOD = 200mV) and is consistent across the MAX6378/MAX6379/MAX6380 group per the Electrical Characteristics table.

Is the MAX6380UR44-T available in both leaded and lead-free packaging?

Yes, the MAX6380UR44-T is offered in both leaded and lead-free versions. The standard "-T" suffix denotes leaded packaging; to specify lead-free, replace "-T" with "+T" in the order code (e.g., MAX6380UR44+T), per Maxim's ordering information guidelines.