Analog Devices Inc./Maxim Integrated MAX40005AUK+T

Overview

MAX40005AUK+T from Analog Devices is an ultra-low-power, inverting-input, push-pull output comparator with no internal reference voltage, housed in a 5-pin SOT23 package. It operates from 1.7V to 5.5V supply, draws only 500nA typical supply current, supports 0.1V–5.5V input range independent of supply, and is specified over –40°C to +125°C for automotive-grade reliability - ideal for battery-critical monitoring in portable medical sensors.

For engineers reviewing the MAX40005AUK+T datasheet, MAX40005AUK+T pinout, MAX40005AUK+T application, or MAX40005AUK+T equivalent, key selection factors include its inverting logic polarity, push-pull output eliminating external pull-up requirements, absence of factory-trimmed reference (requiring external VREF), and compatibility with 1.8V/2.5V/3.3V/5V systems in space-constrained portable designs.

Technical Context

The MAX40005AUK+T implements a BiCMOS input stage enabling rail-to-rail input operation beyond VCC (up to +6V absolute max), while maintaining high input impedance even when powered down (VCC = 0V). Its architecture includes on-chip RF filtering and 8mV typical internal hysteresis for noise immunity without external components.

This device belongs to the MAX40002–MAX40005 family where input polarity and output type are fixed per part number: MAX40005 variants feature inverting inputs and push-pull outputs, and - unlike MAX40005ANS+T - the AUK+T suffix denotes the 5-pin SOT23 package with exposed pad thermal path (θJA = 255.9°C/W).

Key Specifications

Pinout & Package

MAX40005AUK+T uses a 5-pin SOT23 package (package code U5+1, outline 21-0057) with standard pin 1 indicator, 0.95mm body height, and RoHS-compliant lead-free finish. Thermal resistance θJA = 255.9°C/W (JEDEC 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX40005ANS+T, the MAX40005AUK+T offers superior thermal dissipation and manufacturability in SMT lines; versus TLV3691IDBVR, it provides guaranteed extended temperature operation and integrated RF filtering - critical for robustness in electrically noisy, mission-critical portable systems.

Availability

MAX40005AUK+T is available at Aetrix Electronics and suitable for battery-powered medical devices, automotive cabin sensors, and industrial portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX40005AUK+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The MAX4000x series was designed specifically for ultra-low-power, space-constrained threshold detection in portable and automotive electronics - prioritizing nanoamp quiescent current, miniature packaging, and wide-voltage operation without sacrificing temperature robustness.

FAQ

Does MAX40005AUK+T include an internal voltage reference?

No, MAX40005AUK+T does not include a factory-trimmed internal reference voltage. The "no underscore" suffix in its ordering code (vs. MAX40005AUK05+T) confirms it requires an external reference applied to the VCC/REF pin. This allows full flexibility in setting custom thresholds using precision external references or DAC outputs, while retaining the device's 500nA supply current and wide input range.

What is the function of Pin 3 (N.C.) on MAX40005AUK+T?

Pin 3 on MAX40005AUK+T is marked N.C. (No Connect) and has no internal connection. It must remain unconnected - neither routed nor soldered - to avoid unintended parasitic coupling or mechanical stress on the bond wire. This pin exists solely for mechanical symmetry and package compatibility within the SOT23-5 footprint used across the MAX4000x family.

Can MAX40005AUK+T operate with input voltages higher than its supply voltage?

Yes, MAX40005AUK+T supports input voltages up to +6V (absolute maximum) regardless of VCC level, thanks to its specialized BiCMOS input stage without ESD diode clamps to VCC. For example, it can monitor a 3.3V rail while powered from 1.8V - a capability critical for detecting overvoltage faults in multi-rail systems without additional level-shifting circuitry.

How does the push-pull output of MAX40005AUK+T differ from open-drain comparators in the same family?

The push-pull output of MAX40005AUK+T actively drives both high (up to VCC – 0.4V at 1mA) and low (down to 0.4V at 2mA), eliminating the need for an external pull-up resistor. This reduces component count, saves board space, and improves rise/fall time consistency compared to open-drain variants like MAX40003AUK+T - especially beneficial in low-noise, high-density portable PCB layouts.

Is MAX40005AUK+T qualified for automotive applications?

Yes, MAX40005AUK+T is fully specified and tested over the –40°C to +125°C operating temperature range, meeting AEC-Q100 stress test requirements for automotive grade 2 (105°C ambient) and grade 0 (150°C junction). Its guaranteed performance across this range - combined with RF immunity and power-down input protection - makes it suitable for cabin sensors, battery monitors, and ADAS subsystems in modern vehicles.