Analog Devices Inc./Maxim Integrated MAX6381XR46D3-T

Overview

MAX6381XR46D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.63V reset threshold, 140ms minimum V_CC reset timeout, active-low open-drain reset output, and operation down to V_CC = 1.0V. It monitors single supply rails in battery-powered embedded systems and guarantees valid reset assertion during brownout conditions.

For engineers reviewing the MAX6381XR46D3-T datasheet, MAX6381XR46D3-T pinout, MAX6381XR46D3-T application, or MAX6381XR46D3-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), ultra-low 3μA supply current at 1.8V, SC70-3 package footprint, and compatibility with dual-voltage monitoring architectures requiring auxiliary reset inputs.

Technical Context

The MAX6381XR46D3-T implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance across −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset pulse after V_CC recovers above 4.63V.

This variant belongs to the MAX6381–MAX6390 family's open-drain active-low subgroup (MAX6383/MAX6386/MAX6389/MAX6390) and lacks manual reset (MR) and auxiliary RESET IN inputs-confirmed by ordering guide and pin configuration diagrams showing only RESET, V_CC, and GND terminals in 3-pin SC70.

Key Specifications

Pinout & Package

MAX6381XR46D3-T is housed in a 3-pin SC70 package (outline 21-0075) with exposed pad not electrically connected. Pin assignments are fixed and validated per Maxim's official pin description table and top-view diagrams.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX809TRD3-T and TPS3808G33DBVR, MAX6381XR46D3-T uniquely delivers 4.63V precision supervision in a 3-pin open-drain SC70 package with industry-leading 3μA quiescent current-making it optimal for space- and power-constrained 5V system monitoring where reset bus sharing is required.

Availability

MAX6381XR46D3-T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, automotive body control units, and dual-voltage microcontroller systems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6381XR46D3-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 demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 product line delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems operating across extended temperature ranges and low-voltage rails.

FAQ

What is the exact reset threshold voltage of MAX6381XR46D3-T and how tightly is it specified?

The MAX6381XR46D3-T has a nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +125°C). This specification is confirmed in the Electrical Characteristics table and Reset Thresholds table of the official datasheet, where suffix "46" explicitly maps to 4.63V nominal with min/max bounds of 4.51V and 4.74V at +25°C.

Does MAX6381XR46D3-T include a manual reset input (MR) or auxiliary RESET IN pin?

No, MAX6381XR46D3-T does not include MR or RESET IN functionality. As confirmed by the Selector Guide and Pin Configurations section, only MAX6384–MAX6386 and MAX6390 feature MR, while MAX6387–MAX6389 provide RESET IN. The MAX6381 series (including MAX6381XR46D3-T) is a 3-pin device with RESET, V_CC, and GND only.

What package type and dimensions does MAX6381XR46D3-T use?

MAX6381XR46D3-T uses a 3-pin SC70 package (outline number 21-0075), measuring 1.25mm × 0.85mm with 0.65mm pitch. Land pattern number 90-0208 applies, and the package is RoHS-compliant (denoted by "+T" suffix). This compact footprint is validated in the Package Information section and Pin Configurations diagrams.

How does the open-drain reset output of MAX6381XR46D3-T interface with a microprocessor reset input?

The open-drain RESET output of MAX6381XR46D3-T requires an external pullup resistor to V_CC or another logic supply to establish a valid high level when deasserted. When asserted, it pulls low to sink current (up to 3.2mA at V_CC ≥ 4.5V). This configuration enables wired-OR reset buses and voltage-level translation-unlike push-pull variants which cannot share a common reset line.

Is MAX6381XR46D3-T qualified for automotive applications?

Yes, MAX6381XR46D3-T is AEC-Q100 qualified for automotive use. The "/V" suffix denotes automotive qualification, and while MAX6381XR46D3-T itself carries "+T" (RoHS), its underlying MAX6381XR46D3/V+T variant is explicitly listed in the Ordering Information table with −40°C to +125°C temperature range and automotive qualification-confirming the die and process meet AEC-Q100 requirements.