Analog Devices Inc./Maxim Integrated MAX6801UR44D2+

Overview

MAX6801UR44D2+ from Maxim Integrated is a precision microprocessor supervisory circuit in SOT23-3 package, providing active-low push/pull reset assertion when VCC drops below 4.38V (±3% over temperature), with a guaranteed minimum 20ms timeout period and ultra-low 4µA supply current at 3V. It ensures reliable power-on reset for 3.3V/5V embedded controllers and portable systems requiring brownout protection down to 0.7V.

For engineers reviewing the MAX6801UR44D2+ datasheet, MAX6801UR44D2+ pinout, MAX6801UR44D2+ application, or MAX6801UR44D2+ equivalent, this page delivers verified electrical parameters, thermal performance across –40°C to +125°C, reset timing behavior under fast VCC transients, and validated alternatives for μP reset circuit design.

Technical Context

The MAX6801UR44D2+ integrates a factory-trimmed voltage comparator with ±3% threshold accuracy over –40°C to +125°C and a precision timeout timer generating ≥20ms active-low reset pulses after VCC recovery. Its push/pull output drives CMOS inputs directly without external pull-up resistors.

Designed for immunity to fast VCC transients (e.g., ≤30µs glitches at 100mV overdrive), it maintains valid RESET assertion down to VCC = 0.7V and supports operation up to 5.5V supply, meeting requirements for industrial and automotive-grade microcontroller supervision.

Key Specifications

Pinout & Package

MAX6801UR44D2+ is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051) with 0.95mm pitch, optimized for space-constrained PCB layouts. Pin 1 is GND, Pin 2 is active-low RESET output, and Pin 3 is VCC input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6801UR44D2+, MAX809TRD2+T offers higher reset voltage for stricter 5V brownout detection, while TLV803EB29DBZR provides lower-threshold supervision for 3.3V domains but requires external biasing - both lack the 0.7V operational floor and transient rejection of the MAX6801UR44D2+.

Availability

MAX6801UR44D2+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6801UR44D2+ 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, and communications applications, emphasizing high reliability and low power.

The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, factory-trimmed microprocessor supervisory circuits targeting space-constrained embedded systems needing deterministic reset behavior during brownout and startup.

FAQ

What is the exact reset threshold voltage of MAX6801UR44D2+ and how does it vary with temperature?

The MAX6801UR44D2+ has a factory-trimmed nominal reset threshold of 4.38V at +25°C, with guaranteed tolerance of ±3% over the full –40°C to +125°C operating range. This means the actual threshold remains between 4.249V and 4.511V across temperature, ensuring consistent brownout detection in automotive and industrial environments where supply rails fluctuate with thermal stress.

Does MAX6801UR44D2+ require external components to function as a reset supervisor?

No, MAX6801UR44D2+ operates as a fully self-contained reset supervisor with no external components required. Its integrated voltage comparator, precision timeout timer, and push/pull output eliminate the need for RC networks, discrete transistors, or pull-up resistors - reducing BOM count, PCB area, and design validation effort compared to discrete reset solutions.

What is the minimum supply voltage at which MAX6801UR44D2+ guarantees valid RESET output assertion?

MAX6801UR44D2+ guarantees valid active-low RESET output assertion down to VCC = 0.7V across the full –40°C to +125°C temperature range. This ultra-low operating floor ensures deterministic reset behavior during deep brownout events, unlike many competitors that fail to assert reset below 1.0V or require external pulldown resistors to maintain logic state.

How does MAX6801UR44D2+ handle fast voltage transients on the VCC line?

MAX6801UR44D2+ incorporates internal filtering to reject fast negative-going VCC transients up to 30µs duration when overdriven by 100mV - preventing false resets caused by switching noise, relay bounce, or ESD coupling. This transient immunity is characterized in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph of the datasheet and is intrinsic to the comparator architecture.

What package type and RoHS status does MAX6801UR44D2+ use?

MAX6801UR44D2+ uses a 3-pin SOT23 package (outline 21-0051) with lead-free construction indicated by the "+" suffix in the part number. It complies with RoHS Directive 2011/65/EU and is compatible with standard reflow soldering profiles up to +260°C, supporting automated assembly in high-reliability manufacturing lines.