Analog Devices Inc./Maxim Integrated MAX6383XR42D1

Overview

MAX6383XR42D1 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit designed to monitor +4.20V supply rails in space-constrained applications. It features ±2.5% reset threshold accuracy over -40°C to +125°C, 140ms minimum reset timeout, and consumes only 3µA at +1.8V. It ensures reliable power-on reset for critical µP systems in portable and industrial equipment.

For engineers reviewing the MAX6383XR42D1 datasheet, MAX6383XR42D1 pinout, MAX6383XR42D1 application, or MAX6383XR42D1 equivalent, key selection factors include its factory-set 4.20V reset threshold, SC70-3 open-drain output architecture, guaranteed reset validity down to VCC = 1V, and compatibility with battery-backed or low-voltage embedded control systems.

Technical Context

The MAX6383XR42D1 implements a precision bandgap-based voltage comparator with internal 1.27V reference for threshold detection, paired with a temperature-stable RC timer for the 140ms reset timeout. Its open-drain RESET output requires an external pull-up resistor and asserts low when VCC falls below 4.20V (±2.5%), remaining asserted for ≥140ms after VCC recovers.

No manual reset (MR) input or auxiliary RESET IN functionality is present - this variant is a dedicated single-supply monitor with minimal pin count and no additional control inputs. It operates across the full industrial temperature range (-40°C to +125°C) with guaranteed behavior down to VCC = 1.0V.

Key Specifications

Pinout & Package

MAX6383XR42D1 is housed in a 3-pin SC70 package (package code X3-2), measuring 2.0mm × 2.1mm × 0.95mm, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T and TPS3808G33DBVR, MAX6383XR42D1 uniquely delivers 4.20V precision supervision in SC70-3 with industry-leading 3µA ICC - making it optimal for fixed 4.3V–4.5V rail monitoring where board space and battery life are constrained.

Availability

MAX6383XR42D1 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC modules, medical wearables, and automotive body control units requiring stable component supply and long-term manufacturability.

Supply support for MAX6383XR42D1 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 industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family was engineered specifically for low-voltage, low-power microprocessor reset supervision - emphasizing ultra-low ICC, factory-trimmed thresholds, and compact packaging for space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for MAX6383XR42D1?

The MAX6383XR42D1 has a factory-set nominal reset threshold of 4.20V, with a tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This means the actual threshold falls between 4.10V and 4.31V under worst-case conditions, as specified in the Electrical Characteristics table of the MAX6381–MAX6390 datasheet. The '42' suffix in MAX6383XR42D1 explicitly denotes the 4.20V threshold variant.

Does MAX6383XR42D1 include a manual reset input (MR)?

No, MAX6383XR42D1 does not include a manual reset input. It is a dedicated single-supply supervisory circuit with only three pins: RESET (open-drain), VCC, and GND. Manual reset capability is present only in selected variants such as MAX6384, MAX6385, MAX6386, and MAX6390 - all of which use 4-pin or 6-pin packages. The absence of MR simplifies design and reduces cost for applications requiring only power-fail detection.

What package type and dimensions does MAX6383XR42D1 use?

MAX6383XR42D1 is packaged in a 3-pin SC70 (X3-2) case, measuring 2.0mm × 2.1mm × 0.95mm with a 0.65mm pitch. This ultra-compact outline is documented in Maxim package drawing 21-0075. The SC70-3 footprint provides significant area savings over legacy SOT-23 solutions and is compatible with standard surface-mount assembly processes, making it ideal for miniaturized portable and wearable electronics.

Can MAX6383XR42D1 operate reliably at VCC = 1.2V?

Yes, MAX6383XR42D1 is fully specified to operate and assert a valid reset signal down to VCC = 1.0V. At 1.2V, the device remains functional: the internal comparator continues monitoring, the 140ms timeout timer operates correctly, and the open-drain RESET output can sink ≥80µA while maintaining VOL ≤ 0.3V. This capability ensures deterministic behavior during deep brownout events where other supervisors may fail silently.

Is MAX6383XR42D1 RoHS-compliant and lead-free?

Yes, MAX6383XR42D1 is RoHS-compliant and lead-free. The '+' suffix in the full orderable part number (e.g., MAX6383XR42D1+) explicitly indicates a lead-free, RoHS-compliant package per Maxim's naming convention. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 requirements and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.