Analog Devices Inc./Maxim Integrated MAX6801UR44D3+T

Overview

MAX6801UR44D3+T from Maxim Integrated is a precision 4.38V active-low push/pull microprocessor supervisory circuit in SOT23-3 package, monitoring VCC supply voltage and asserting RESET during brownout, power-up, and power-down events with guaranteed operation down to 0.7V. It delivers 100ms minimum reset timeout, 4µA supply current at 3V, and ±3% threshold accuracy over -40°C to +125°C for reliable embedded system power sequencing.

For engineers reviewing the MAX6801UR44D3+T datasheet, MAX6801UR44D3+T pinout, MAX6801UR44D3+T application, or MAX6801UR44D3+T equivalent, key selection criteria include factory-trimmed 4.38V reset threshold, 100ms timeout stability across temperature, push/pull output drive capability (1.2mA sink), and guaranteed RESET validity to VCC = 0.7V in space-constrained industrial controllers and battery-powered instrumentation.

Technical Context

The MAX6801UR44D3+T implements a precision bandgap-based reset comparator with factory-trimmed 4.38V threshold (±1.8% at +25°C, ±3% over full temperature range) and internal timing capacitor for fixed 100ms minimum reset pulse width. Its push/pull output structure eliminates external pull-up components while ensuring fast, low-impedance RESET assertion and release.

Designed for ultra-low-power systems, it draws only 4–12µA across 3V–5V VCC and operates reliably from VCC = 0.7V up to 5.5V, with immunity to fast transients (<30µs at 100mV overdrive). The device is fully specified over automotive-grade temperature range (-40°C to +125°C) and features BiCMOS process for stable performance under thermal stress.

Key Specifications

Pinout & Package

MAX6801UR44D3+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), optimized for high-density PCB layouts with 0.95mm pitch and 2.9mm × 1.6mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6801UR44D3+T, MAX809TRD3+T provides higher reset voltage and longer timeout in identical footprint but lacks 0.7V operation guarantee; TPS3808G33DBVR offers lower power and configurability but demands additional passives and board space - MAX6801UR44D3+T remains optimal for fixed 4.38V, 100ms, ultra-low-VCC applications.

Availability

MAX6801UR44D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, and smart energy meters requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX6801UR44D3+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 industrial, automotive, and computing applications, emphasizing reliability, low power, and integration.

The MAX6800/MAX6801/MAX6802 family delivers single-function, ultra-low-power µP reset supervision with factory-trimmed thresholds and fixed timeouts - engineered for cost-sensitive, space-constrained embedded systems demanding fail-safe power monitoring.

FAQ

What is the exact reset threshold voltage of MAX6801UR44D3+T and how is it trimmed?

The MAX6801UR44D3+T has a factory-trimmed nominal reset threshold of 4.38V, with ±1.8% tolerance at +25°C and ±3% over -40°C to +125°C. This value is laser-trimmed during wafer test per Table 1 in the datasheet and corresponds to the "44" suffix in the part number. The trimming ensures precise detection of 4.5V supply collapse without external components or calibration - critical for repeatable system-level power sequencing validation.

Does MAX6801UR44D3+T support operation below 1.0V, and what happens to RESET output at ultra-low VCC?

Yes, MAX6801UR44D3+T is guaranteed to assert and maintain valid RESET down to VCC = 0.7V, unlike the MAX6802 which requires ≥1.0V. At VCC near 0.7V, the push/pull output retains sufficient sink strength (V_OL ≤ 0.4V at 50µA) to hold µP reset pins low, ensuring fail-safe shutdown before complete power loss - a key differentiator for battery-backed or energy-harvesting systems.

What is the reset timeout period of MAX6801UR44D3+T and how is it implemented?

The MAX6801UR44D3+T provides a fixed 100ms minimum reset timeout period (150ms typical, 200ms maximum), implemented via an internal RC timing circuit - no external capacitor required. This duration is factory-programmed using the "D3" suffix and ensures sufficient time for microprocessor boot ROM execution and peripheral initialization after power recovery, meeting JEDEC JESD78 reliability requirements for reset assertion width.

How does the push/pull output of MAX6801UR44D3+T differ from open-drain alternatives like MAX6802?

The MAX6801UR44D3+T uses a push/pull output that actively drives RESET both low and high, eliminating the need for an external pull-up resistor. In contrast, MAX6802's open-drain output requires a pull-up and cannot actively drive high. This makes MAX6801UR44D3+T ideal for systems with high-impedance reset inputs or where board space and BOM count are constrained - confirmed by its pin compatibility with MAX809/MAX810 series.

Is MAX6801UR44D3+T suitable for automotive applications, and what temperature range does it cover?

Yes, MAX6801UR44D3+T is rated for -40°C to +125°C operation and appears in Maxim's automotive-qualified ordering table, making it suitable for body control modules and infotainment power supervisors. Its BiCMOS process, guaranteed 0.7V operation, and ±3% threshold stability across this range meet AEC-Q100 stress-test requirements for ambient temperature variation - though formal AEC-Q100 certification documentation must be obtained separately from Analog Devices.