Analog Devices Inc./Maxim Integrated MAX9018BEKA/V+T

Overview

MAX9018BEKA/V+T from Maxim Integrated is a dual, nanoPower comparator with open-drain outputs, integrated 1.24V ±1.75% reference, Beyond-the-Rails™ input range (VEE −0.2V to VCC +0.2V), 1.2μA supply current at 1.8V, and 4mV internal hysteresis - designed for ultra-low-power 2-cell battery monitoring and threshold detection in space-constrained portable systems.

For engineers reviewing the MAX9018BEKA/V+T datasheet, MAX9018BEKA/V+T pinout, MAX9018BEKA/V+T application, or MAX9018BEKA/V+T equivalent, this page delivers verified circuit role (dual precision comparator with reference), package mapping (8-pin SOT23), pin-validated terminal functions, key timing specs (tPD− = 7µs @ 1.8V), and two confirmed alternative parts with documented functional and application differences.

Technical Context

The MAX9018BEKA/V+T implements a dual comparator architecture with independent INA+/INA− and INB+/INB− inputs, where REF/INA− serves as both a 1.24V reference output and the inverting input of Comparator A. Its open-drain output stage supports mixed-voltage logic interfacing up to 5.5V above VEE.

It features crowbar-current-free switching to suppress supply glitches, operates from 1.8V to 5.5V, guarantees operation across −40°C to +85°C, and uses internal hysteresis (4mV) to prevent oscillation on slow or noisy inputs - critical for reliable sensing in battery-powered telemetry and medical instruments.

Key Specifications

Pinout & Package

MAX9018BEKA/V+T is housed in an 8-pin SOT23 package (package code T833+2, outline 21-0078), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W on four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9017BEKA/V+T, the MAX9018BEKA/V+T offers open-drain flexibility for multi-drop bus signaling; compared with TLV3702IDR, it integrates a calibrated reference and supports true beyond-rail sensing - reducing component count and PCB area in battery-critical designs.

Availability

MAX9018BEKA/V+T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, portable medical instrumentation, telemetry sensor nodes, and automotive cabin environment sensing requiring stable component supply and long-term lifecycle support.

Supply support for MAX9018BEKA/V+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, automotive, and portable electronics.

The MAX9015–MAX9020 family was engineered specifically for ultra-low-power, dual-comparator applications requiring integrated reference and rail-agnostic input operation - targeting battery longevity and minimal board space in space-constrained systems.

FAQ

What is the reference voltage tolerance and temperature drift of the MAX9018BEKA/V+T?

The MAX9018BEKA/V+T features a B-grade 1.24V reference with ±1.75% initial accuracy at +25°C and ±4.5% total error over −40°C to +85°C. Its temperature coefficient is 40ppm/°C, resulting in ≤±0.37mV drift across the full operating range - sufficient for 2% threshold detection in battery monitoring applications where absolute precision is secondary to stability and low power.

Can the MAX9018BEKA/V+T operate from a single 1.8V supply?

Yes, the MAX9018BEKA/V+T is fully specified to operate from 1.8V to 5.5V. At 1.8V, it draws only 1.2μA supply current, maintains 4mV hysteresis, and retains Beyond-the-Rails™ input range (down to −0.2V and up to +2.0V). This makes it ideal for direct integration into 2-cell alkaline or NiMH systems without regulation.

How does the REF/INA− pin function in the MAX9018BEKA/V+T?

In the MAX9018BEKA/V+T, Pin 1 is labeled REF/INA− and serves a dual role: it outputs the 1.24V reference voltage *and* is internally connected to the inverting input of Comparator A. When used as a reference, INA− is automatically sourced; if Comparator A's inverting input must be externally driven, the REF function is disabled - requiring use of a separate reference or alternate variant like MAX9017.

What is the maximum sink current capability of the MAX9018BEKA/V+T outputs?

The open-drain outputs of the MAX9018BEKA/V+T are rated for continuous sink current up to ±50mA (absolute maximum), but typical design practice limits to ≤6mA for stable VOL < 300mV at 1.8V. The datasheet specifies VOL = 200mV @ 1mA and 300mV @ 6mA at 1.8V - confirming robust drive for standard logic-level pull-ups and MCU interrupt inputs.

Is the MAX9018BEKA/V+T qualified for automotive applications?

Yes, the MAX9018BEKA/V+T carries AEC-Q100 Grade 3 qualification (−40°C to +85°C ambient), as indicated by the "/V" suffix in its part number. It meets stress testing requirements for temperature cycling, humidity, and ESD - making it suitable for non-safety-critical automotive cabin applications including climate control sensors, seat occupancy detection, and infotainment power monitoring.