Analog Devices Inc./Maxim Integrated MAX6382XR43D2

Overview

MAX6382XR43D2 from Maxim Integrated is a single-supply, active-high push-pull microprocessor supervisory circuit with factory-set 4.30V reset threshold and 140ms minimum reset timeout. It monitors VCC in low-power systems (1.0V–5.5V), consumes only 3µA at +1.8V, guarantees valid reset output down to VCC = 1V, and is housed in a 3-pin SC70 package. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6382XR43D2 datasheet, MAX6382XR43D2 pinout, MAX6382XR43D2 application, or MAX6382XR43D2 equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), ultra-low supply current, guaranteed reset assertion at VCC ≥ 1V, compatibility with 1.8V/2.5V/3.3V/5V logic domains, and SC70 footprint constraints for space-constrained designs.

Technical Context

The MAX6382XR43D2 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset timeout after VCC rises above 4.30V, independent of temperature or supply variation.

It features an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinking 3.2mA (VOL ≤ 0.4V), ensuring robust drive into µP reset inputs without external pull-up. No manual reset (MR) or auxiliary RESET IN pins are present - this variant is optimized for simple single-rail monitoring.

Key Specifications

Pinout & Package

Package: 3-pin SC70 (X3-2), 1.25mm × 0.8mm × 0.9mm, lead-free, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G14DBVR, the MAX6382XR43D2 offers the tightest combination of ultra-low ICC (3µA @ 1.8V), ±2.5% full-temperature accuracy, and minimal SC70-3 footprint - making it optimal for space- and energy-constrained 1.8V/2.5V/3.3V embedded designs.

Availability

MAX6382XR43D2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6382XR43D2 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, sensing, and interface applications, with emphasis on reliability, low power, and small form factor.

The MAX6381–MAX6390 family delivers single/dual low-voltage µP supervisory circuits targeting battery-powered, automotive, and industrial systems where guaranteed reset behavior under brownout and fast transient conditions is mandatory.

FAQ

What is the exact reset threshold voltage of the MAX6382XR43D2?

The MAX6382XR43D2 has a factory-set nominal reset threshold of 4.30V, with a guaranteed range of 4.19V (min) to 4.41V (max) over –40°C to +125°C. This value is laser-trimmed during production and specified in the Reset Thresholds table of the MAX6381–MAX6390 datasheet. The "43" suffix in MAX6382XR43D2 explicitly denotes the 4.30V threshold variant.

Does the MAX6382XR43D2 support manual reset functionality?

No, the MAX6382XR43D2 does not include a manual reset (MR) input. It belongs to the MAX6382 subgroup, which features only VCC monitoring and an active-high push-pull RESET output. Manual reset capability is available only in MAX6384/MAX6385/MAX6386/MAX6390 variants, identifiable by their 4-pin SC70 or 6-pin µDFN packages and "XS" or "LT" prefixes.

What is the minimum supply voltage at which the MAX6382XR43D2 guarantees correct RESET output logic state?

According to the Electrical Characteristics table, the MAX6382XR43D2 guarantees valid RESET output logic state down to VCC = 1.0V. Below this voltage, the internal comparator and timer may not operate reliably. This specification ensures deterministic reset behavior during deep brownout or battery depletion scenarios - a key differentiator versus competitors that specify operation only down to 1.5V or higher.

Can the MAX6382XR43D2 be used to monitor a 1.8V supply rail?

Yes, the MAX6382XR43D2 can monitor a 1.8V supply rail, but only to detect failure below its 4.30V threshold - which is not applicable. For 1.8V rail supervision, a lower-threshold variant such as MAX6382XR18D2 (1.80V) must be selected. The "43" suffix fixes the threshold at 4.30V; it cannot be reconfigured. Using MAX6382XR43D2 on a 1.8V rail would result in permanent reset assertion since VCC never reaches the threshold.

Is the MAX6382XR43D2 pin-compatible with the MAX809 series?

Yes, the MAX6382XR43D2 in SC70-3 package is pin-compatible with MAX809/MAX810 in SOT-23-3 for VCC, GND, and RESET connections, but mechanical layout adaptation is required due to differing footprints (SC70-3 vs. SOT-23-3). Electrically, both share identical pin functions and active-high push-pull output behavior, enabling drop-in replacement in many designs - provided PCB land patterns are updated to match SC70-3 dimensions and solder paste stencil.