Analog Devices Inc./Maxim Integrated MAX6380UR43

Overview

MAX6380UR43 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 4.30V threshold (±2.5% over temperature), 500nA supply current, and guaranteed operation down to 1V VCC - ideal for supervising 3.3V/5V rails in portable medical devices and IoT sensors.

For engineers reviewing the MAX6380UR43 datasheet, MAX6380UR43 pinout, MAX6380UR43 application, or MAX6380UR43 equivalent, this device delivers verified reset assertion accuracy, transient-immune detection, and SOT23-3 compatibility for space-constrained PCBs requiring reliable brownout protection without external components.

Technical Context

The MAX6380UR43 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.30V trip point. Its open-drain output sinks up to 100µA at VCC ≥1.2V when asserted, and it ignores transients ≤200µs (at 100mV overdrive), ensuring immunity to switching noise on monitored rails.

All operating parameters - including ±2.5% threshold accuracy across –40°C to +85°C, 9.5µs propagation delay (falling edge), and 0.1V hysteresis - are fully specified and production-tested per Maxim's characterization methodology. The device requires no external biasing or calibration and asserts OUT low only when VCC falls below VTH.

Key Specifications

Pinout & Package

MAX6380UR43 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with industry-standard 3-pin voltage supervisors. Pin 1 = GND, Pin 2 = OUT (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EC29DBZR and TPS3808G33DBVR, MAX6380UR43 uniquely combines 4.30V precision threshold, 500nA ultra-low current, and open-drain output in SOT23-3 - making it optimal for 5V-system brownout detection where minimal parasitic drain and bus-sharing capability are critical.

Availability

MAX6380UR43 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and wireless sensor nodes requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MAX6380UR43 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 high-performance analog and mixed-signal ICs for power management, sensing, and communication applications.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems - delivering precision thresholds, nanoscale current consumption, and robust transient rejection in minimal 3-pin packages.

FAQ

What is the exact reset threshold voltage of MAX6380UR43 and how tightly is it specified?

The MAX6380UR43 has a factory-trimmed nominal reset threshold of 4.30V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +85°C). This specification is validated across production lots and documented in Maxim's Electrical Characteristics table, ensuring consistent performance without user calibration. The 4.30V point places MAX6380UR43 precisely between standard 3.3V and 5V rail supervision requirements.

Does MAX6380UR43 require any external components to function?

No, MAX6380UR43 operates autonomously with no external components required. Its internal precision bandgap reference, comparator, and trimmed resistor network eliminate the need for external voltage dividers or trimming potentiometers. Only an external pull-up resistor on the open-drain OUT pin is necessary to establish the logic-high level - a standard design practice for open-drain interfaces and not considered an "external functional component" per the device's zero-component supervision claim.

What is the maximum supply voltage that can be safely applied to the OUT pin of MAX6380UR43?

The OUT pin of MAX6380UR43 is rated for voltages up to +6V relative to GND, independent of VCC. This allows the open-drain output to be pulled up to any logic supply within the 1.8V–5.5V range - including higher-voltage domains like 5V microcontrollers or industrial I/O lines - without risk of damage. This rating is explicitly stated in the Absolute Maximum Ratings table and confirmed in the Applications Information section.

How does MAX6380UR43 handle fast transients on the VCC line?

MAX6380UR43 incorporates built-in transient immunity: it ignores negative-going VCC glitches shorter than 200µs when the overdrive (VTH – VCC) is 100mV, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive". This feature prevents false resets caused by switching regulator noise or load-step events, and is inherent to the internal comparator design - no external RC filtering is needed to achieve this behavior.

Is MAX6380UR43 compatible with lead-free soldering processes?

Yes, MAX6380UR43 is available in both leaded and lead-free packaging. To specify lead-free, replace the "-T" suffix with "+T" in the order code (e.g., MAX6380UR43+T). The device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements and is qualified for standard reflow profiles including IPC/JEDEC J-STD-020 Rev D, supporting peak temperatures up to 260°C. Full process compatibility data is provided in Maxim's Package Information document.