Analog Devices Inc./Maxim Integrated MAX40001AUT22+T

Overview

The MAX40001AUT22+T from Maxim Integrated is a nanoPower open-drain comparator with integrated 2.22V precision voltage reference, designed for ultra-low-power portable electronics requiring rail-to-rail input operation, sub-1µA supply current, and stable reference output up to 100pF capacitive load - deployed in battery voltage monitoring and level detection circuits within space-constrained notebooks and wearables.

For engineers reviewing the MAX40001AUT22+T datasheet, MAX40001AUT22+T pinout, MAX40001AUT22+T application, or MAX40001AUT22+T equivalent, key selection criteria include its 2.22V factory-trimmed reference accuracy (±1% at +25°C, <±2.5% over −40°C to +125°C), 0.9µA typical supply current, 1.7V–5.5V supply range, −0.2V to VDD+0.2V input common-mode range, and SOT23-6 open-drain output stage.

Technical Context

The MAX40001AUT22+T integrates a bandgap-based voltage reference with 15ppm/°C thermal drift and 10kΩ max output impedance, enabling direct use as a stable threshold source without external components. Its comparator core delivers 2.5mV internal hysteresis and operates across the full automotive temperature range (−40°C to +125°C).

It features a break-before-make open-drain output stage capable of sinking ≥2mA while maintaining rail-to-rail swing, with propagation delay under 14.8µs (L→H, 100kΩ pullup) and RF-immune internal filtering - critical for noise-prone portable environments where supply glitches must be minimized.

Key Specifications

Pinout & Package

MAX40001AUT22+T is packaged in a 6-pin SOT23 (package code U6+1), footprint-compatible with industry-standard SOIC-6 but with 2.9mm × 1.6mm body height and 0.95mm pitch. The package supports reflow soldering per JEDEC J-STD-020 (260°C peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar comparator-with-reference applications.

Compared with TLV4041DBVR and MAX9062AXK+T, the MAX40001AUT22+T uniquely provides a 2.22V reference optimized for mid-range battery voltage thresholds (e.g., 3.3V/5V rail monitoring), tighter reference accuracy over temperature, and documented RF immunity - making it preferred for automotive-grade portable instrumentation where threshold stability and EMI resilience are critical.

Availability

MAX40001AUT22+T is available at Aetrix Electronics and suitable for battery-powered wearables, notebook power management, portable medical instruments, and consumer electronics requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for MAX40001AUT22+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 demanding industrial, automotive, and portable applications, emphasizing low power, small size, and high reliability.

The MAX40000/MAX40001 family was engineered specifically for ultra-low-power level detection in space- and energy-constrained portable systems, integrating reference and comparator in minimal footprint SOT23/WLP packages.

FAQ

What is the reference voltage tolerance of the MAX40001AUT22+T over temperature?

The MAX40001AUT22+T features a factory-trimmed 2.22V internal reference with ±1% initial accuracy at +25°C and guaranteed stability better than ±2.5% across the full −40°C to +125°C operating range. Its 15ppm/°C thermal drift ensures predictable threshold behavior in automotive and industrial portable equipment where ambient temperature varies widely.

Can the MAX40001AUT22+T operate from a 1.8V supply?

Yes, the MAX40001AUT22+T supports supply voltages from 1.7V to 5.5V, making it fully compatible with 1.8V logic rails. At 1.8V, it maintains full functionality including 2.22V reference output, −0.2V to 2.0V input common-mode range, and open-drain output that can sink ≥2mA - ideal for ultra-low-voltage coin-cell or energy-harvesting systems.

Does the MAX40001AUT22+T require external bypass capacitors?

Yes - a 0.1µF ceramic capacitor should be placed as close as possible between VDD and GND pins, and another 0.1µF capacitor between REF and GND. These minimize supply noise coupling and ensure reference stability under dynamic load, especially critical given the device's high sensitivity to supply ripple in nanoPower operation.

How does the open-drain output of the MAX40001AUT22+T enable level translation?

The MAX40001AUT22+T open-drain output allows independent selection of pullup voltage. For example, powering VDD from 5V while pulling OUT to 3.3V enables safe 5V-to-3.3V logic translation without overvoltage stress on downstream 3.3V GPIOs - a capability confirmed in the device's Typical Application Circuit and validated in Logic-Level Translator section of the datasheet.

Is the MAX40001AUT22+T pin-compatible with other MAX4000x variants?

Yes - all MAX40000/MAX40001 SOT23-6 variants (e.g., MAX40001AUT12+T, MAX40000AUT22+T) share identical pinout, footprint, and thermal characteristics. Swapping to a different reference voltage or push-pull variant requires only firmware or external circuit adjustment - no PCB redesign is needed.