Analog Devices Inc./Maxim Integrated MAX6865UK41D3S+T

Overview

The MAX6865UK41D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 4.100V reset threshold (±2.5%), and 150ms minimum reset timeout. It integrates manual reset input (MR), watchdog timer with 3.3s typical timeout, and push-pull active-high RESET output - designed for reliable power-up/brownout monitoring in battery-critical portable medical and consumer devices.

For engineers reviewing the MAX6865UK41D3S+T datasheet, MAX6865UK41D3S+T pinout, MAX6865UK41D3S+T application, or MAX6865UK41D3S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), watchdog pulse detection capability (≥150ns), and lead-free SOT23-5 packaging compliant with RoHS requirements.

Technical Context

The MAX6865UK41D3S+T implements a dual-monitoring architecture: a precision voltage detector triggers reset when VCC falls below 4.100V (±2.5%), while an independent watchdog timer monitors WDI activity and expires if no edge occurs within 3.3s (typ). Both events assert the active-high push-pull RESET output for a fixed 150ms minimum timeout period after recovery.

Its MR input features internal 10kΩ pullup, 1µs minimum pulse width support, and 250ns MR-to-reset delay. The device operates across -40°C to +85°C, draws only 170nA (typ) at VCC = 1.8V, and guarantees valid RESET output down to VCC = 1.1V - enabling robust supervision in low-voltage, long-life battery systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, RoHS-compliant surface-mount package (2.9mm × 1.6mm × 1.1mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6864UK41D3S+T, the MAX6865UK41D3S+T offers identical core supervision but adds CT pin flexibility; versus TPS3837K33DBVR, it delivers 10× lower ICC, precise 4.1V threshold, and integrated watchdog - making it superior for long-life, safety-critical, or feature-rich portable designs.

Availability

MAX6865UK41D3S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial handheld equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6865UK41D3S+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 power, sensing, and interface applications in industrial, medical, and communications markets.

The MAX6854–MAX6869 family delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable healthcare, wearables, and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6865UK41D3S+T?

The MAX6865UK41D3S+T has a factory-trimmed reset threshold voltage of 4.100V with ±2.5% tolerance over temperature (-40°C to +85°C), as defined by the '41' suffix in its part number per Maxim's Threshold Suffix Guide. This value is laser-trimmed during production and does not require external calibration.

Does the MAX6865UK41D3S+T include a watchdog timer, and what is its timeout period?

Yes, the MAX6865UK41D3S+T includes an integrated watchdog timer with a typical timeout period of 3.3s, indicated by the 'S' suffix in its part number. The timer resets on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period, triggering a full reset sequence.

What is the function of the CT pin on the MAX6865UK41D3S+T?

The MAX6865UK41D3S+T does not have a CT pin. That pin is present only on MAX6861/MAX6862/MAX6863 variants. The MAX6865UK41D3S+T uses fixed D3 (150ms) reset timeout and relies solely on MR and WDI inputs - confirming its pinout as Pin 1=RESET, Pin 2=GND, Pin 3=MR, Pin 4=WDI, Pin 5=VCC.

What output type does the MAX6865UK41D3S+T provide, and how is it configured?

The MAX6865UK41D3S+T provides a push-pull active-high RESET output, as confirmed by its position in the Selector Guide and Pin Description tables. It drives high during fault conditions and returns low after the 150ms timeout, eliminating need for external pullup resistors and supporting direct interfacing with µP reset inputs rated for VCC-referenced logic.

Is the MAX6865UK41D3S+T lead-free and RoHS-compliant?

Yes, the '+T' suffix in MAX6865UK41D3S+T explicitly denotes lead-free, RoHS-compliant packaging per Maxim's ordering conventions. It uses matte-tin lead finish on the 5-pin SOT23-5 package and meets JEDEC J-STD-020 moisture sensitivity level 1 requirements for standard reflow processing.