Analog Devices Inc./Maxim Integrated MAX6381XR46D2/V+T

Overview

MAX6381XR46D2/V+T from Maxim Integrated is an automotive-grade, low-power microprocessor supervisory circuit in a 3-pin SC70 package. It provides active-low open-drain reset output with factory-set 4.63V reset threshold (±2.5% over −40°C to +125°C) and 20ms minimum reset timeout. Designed for power monitoring in battery-powered controllers and critical μP systems, it guarantees valid reset assertion down to VCC = 1V while consuming only 3μA at 1.8V.

For engineers reviewing the MAX6381XR46D2/V+T datasheet, MAX6381XR46D2/V+T pinout, MAX6381XR46D2/V+T application, or MAX6381XR46D2/V+T equivalent, key selection criteria include its AEC-Q100 qualification, 4.63V threshold accuracy, 20ms VCC reset timeout, open-drain output architecture, and automotive-temperature operation without manual reset input.

Technical Context

This device implements a precision voltage comparator monitoring VCC against a trimmed internal reference, coupled with a temperature-stable monostable timer that enforces a fixed 20ms reset assertion window after VCC recovers above 4.63V. The open-drain RESET output requires an external pullup and supports mixed-voltage system interfacing.

No auxiliary voltage monitor (RESET IN) or manual reset (MR) input is integrated-this variant belongs to the MAX6381 base family, distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 derivatives. Its reset behavior is strictly VCC-triggered with no secondary inputs or debounced controls.

Key Specifications

Pinout & Package

3-pin SC70 package (outline 21-0075, land pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisory ICs. Thermal resistance θ_JA = 340.4°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR46D2/V+T, MAX6381XR46D2/V+T delivers 40% lower supply current and enhanced transient rejection-critical for battery-backed or high-noise automotive nodes. Versus TLV803EB33DBZR, it provides correct 4.63V threshold and precise 20ms timing for legacy 5V μP platforms, avoiding firmware or hardware rework.

Availability

MAX6381XR46D2/V+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, portable medical devices, and smart energy metering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6381XR46D2/V+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 family delivers ultra-low-power, AEC-Q100–qualified supervisory circuits optimized for reliable reset generation in safety-critical microprocessor systems operating from 1.8V to 5.5V rails.

FAQ

What is the exact reset threshold voltage of MAX6381XR46D2/V+T and how tightly is it specified?

The MAX6381XR46D2/V+T has a nominal reset threshold of 4.63V, with guaranteed limits of 4.51V (minimum) and 4.74V (maximum) at +25°C. Over the full −40°C to +125°C operating range, the threshold remains within ±2.5% of 4.63V-i.e., 4.51V to 4.74V-ensuring consistent brownout detection across automotive thermal environments without calibration.

Does MAX6381XR46D2/V+T include a manual reset input (MR) or auxiliary voltage monitor (RESET IN)?

No. MAX6381XR46D2/V+T belongs to the base MAX6381 series and contains only VCC monitoring functionality. It does not integrate a manual reset input (MR) or auxiliary RESET IN comparator-those features are present only in MAX6384–MAX6390 (MR) and MAX6387–MAX6389 (RESET IN) variants. This simplifies design for single-rail applications where only primary supply supervision is needed.

What is the function and electrical behavior of the RESET pin on MAX6381XR46D2/V+T?

The RESET pin on MAX6381XR46D2/V+T is an active-low open-drain output. When asserted (during VCC < 4.63V or during the 20ms timeout), it pulls low by sinking current. When deasserted, it presents a high-impedance state-requiring an external pullup resistor to define the logic-high voltage. This architecture supports wired-OR reset buses and level translation between different voltage domains in complex systems.

Is MAX6381XR46D2/V+T compatible with standard SC70-3 footprints and what are its thermal characteristics?

Yes. MAX6381XR46D2/V+T uses the standard 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with 0.65mm pitch. Its junction-to-ambient thermal resistance (θ_JA) is 340.4°C/W on a multilayer PCB. This value informs thermal design margining-e.g., at 3μA ICC and 5.5V VCC, power dissipation is negligible (<18μW), making self-heating irrelevant in typical applications.

How does the 20ms reset timeout of MAX6381XR46D2/V+T support microprocessor startup reliability?

The 20ms minimum reset timeout of MAX6381XR46D2/V+T ensures the connected microprocessor remains held in reset long enough for all internal clocks, PLLs, and memory subsystems to stabilize after VCC exceeds 4.63V. This meets or exceeds typical μP vendor recommendations (e.g., ARM Cortex-M series require ≥10ms), preventing race conditions, corrupted register states, or failed boot sequences during power-up or brownout recovery.