Analog Devices Inc./Maxim Integrated MAX6841FUKD3+

Overview

The MAX6841FUKD3+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit designed to monitor 0.9V–1.5V power supplies in portable and battery-powered digital systems. It features a factory-trimmed 1.050V reset threshold (suffix F), 210ms reset timeout (suffix D3), active-low push-pull RESET output, debounced manual reset input (MR), and guaranteed reset validity down to VCC = 0.55V - enabling reliable power-on reset and brownout protection for critical µP applications.

For engineers reviewing the MAX6841FUKD3+ datasheet, MAX6841FUKD3+ pinout, MAX6841FUKD3+ application, or MAX6841FUKD3+ equivalent, this device serves as a low-power (5.7µA typ), SOT23-5 packaged voltage detector with precise ±2.5% threshold accuracy over temperature and immunity to sub-150ns VCC transients - key selection criteria for space-constrained, low-voltage embedded designs.

Technical Context

The MAX6841FUKD3+ implements a precision bandgap-based reset comparator with hysteresis (0.75% of VTH) and a fixed 210ms timeout timer triggered on VCC fall below 1.050V or MR assertion. Its internal 20kΩ MR pullup eliminates external components, while the push-pull RESET output drives CMOS inputs directly without pullup resistors.

Designed for BiCMOS process, it operates across -40°C to +85°C with supply current stable from 0.9V to 1.8V VCC, and guarantees functional reset assertion even as VCC decays to 0.55V - supporting robust power sequencing in sub-1V logic domains.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (lead-free, RoHS-compliant), footprint-compatible with industry-standard SOT-23 layouts and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6841FUKD3+, MAX6315US29D3+ offers lower current but cannot monitor 1.05V rails, while TPS3808G125DBVR provides adjustability at the cost of added components and reduced threshold precision - making MAX6841FUKD3+ optimal for fixed 1.05V, push-pull, low-component-count designs.

Availability

MAX6841FUKD3+ is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable medical devices, and ultra-low-power wearables requiring stable component supply with guaranteed long-term availability and lead-free compliance.

Supply support for MAX6841FUKD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6841–MAX6845 family was engineered specifically for ultra-low-voltage microprocessor supervision in portable and battery-operated systems - delivering precision reset functionality in minimal SOT23-5 footprint with sub-6µA quiescent current.

FAQ

What is the exact reset threshold voltage of the MAX6841FUKD3+?

The MAX6841FUKD3+ has a factory-trimmed reset threshold of 1.050V with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is confirmed in the Threshold Suffix Guide (Table 1) and Electrical Characteristics table under V_TH for suffix F. The MAX6841FUKD3+ does not use an adjustable RESET IN input - its threshold is fixed and internally calibrated.

Does the MAX6841FUKD3+ support operation below 1.0V VCC?

Yes, the MAX6841FUKD3+ operates with VCC as low as 0.75V and guarantees valid reset assertion down to VCC = 0.55V. Its internal circuitry remains functional and the push-pull RESET output maintains defined logic states throughout this range - critical for supervising deeply scaled logic rails and ensuring fail-safe behavior during severe brownout.

What is the function of Pin 3 (RESET) on the MAX6841FUKD3+?

Pin 3 on the MAX6841FUKD3+ is the active-high push-pull RESET output - the logical inverse of Pin 1 (active-low RESET). When VCC falls below 1.050V or MR is asserted, Pin 3 goes high and remains high for the full 210ms timeout period after VCC recovers. This dual-output configuration enables direct interfacing with µPs or logic that require active-high reset signaling without external inverters.

How does the manual reset (MR) input behave on the MAX6841FUKD3+?

The MR input on the MAX6841FUKD3+ is an active-low, debounced signal with an internal 20kΩ pullup resistor to VCC. Pulling MR to GND forces immediate reset assertion, which persists for the full 210ms timeout after MR is released. No external debounce components are needed, and MR accepts CMOS-level signals - simplifying integration with pushbutton switches or system-level control logic.

Is the MAX6841FUKD3+ pin-compatible with other members of the MAX6841–MAX6845 family?

Yes, the MAX6841FUKD3+ shares identical 5-pin SOT23-5 pinout and package dimensions with all MAX6841–MAX6845 variants. Pin assignments (VCC, GND, RESET, RESET, MR) are consistent across the family - enabling drop-in replacement for different threshold or timeout options, provided the output configuration (push-pull vs. open-drain) and feature set (e.g., RESET IN presence) match system requirements.