Analog Devices Inc./Maxim Integrated MAX9648AXK+T

Overview

MAX9648AXK+T from Maxim Integrated is a single, low-voltage, rail-to-rail input comparator with internal 2mV hysteresis, housed in a 5-pin SC70 package (2.0mm × 2.1mm × 1.0mm). It operates from +1.8V to +5.5V, draws 60µA supply current at VDD = +5.0V, features input common-mode range extending to ground, and delivers 120mV output saturation voltage at 4mA sink load - enabling precise threshold detection in battery-powered portable systems.

For engineers reviewing the MAX9648AXK+T datasheet, MAX9648AXK+T pinout, MAX9648AXK+T application, or MAX9648AXK+T equivalent, key selection considerations include its guaranteed automotive temperature range (–40°C to +125°C), noise-immune hysteresis, open-drain output compatible with 1.8V–5.5V logic, and drop-in replacement capability for LMX331/LMX331H in space-constrained designs.

Technical Context

The MAX9648AXK+T implements a BiCMOS comparator core optimized for low-voltage operation and high noise immunity. Its internal 2mV hysteresis establishes distinct rising- and falling-edge trip points, eliminating oscillation on slow-moving or noisy inputs without external components.

It supports single-supply operation with input common-mode range from –0.1V (below VSS) to VDD – 0.7V, and an open-drain output capable of sinking up to 35mA while maintaining ≤400mV VOL across –40°C to +125°C - making it suitable for interfacing with diverse logic families and pull-up configurations.

Key Specifications

Pinout & Package

MAX9648AXK+T is supplied in a 5-pin SC70 package (2.0mm × 2.1mm × 1.0mm footprint), optimized for ultra-compact PCB layouts and automated assembly. The package is RoHS-compliant and lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMX331HMM/NOPB and TLV3604DBVR, the MAX9648AXK+T uniquely combines guaranteed hysteresis, sub-100µA supply current, and full –40°C to +125°C specification - delivering lowest-risk, lowest-BOM solution for robust, battery-efficient threshold detection.

Availability

MAX9648AXK+T is available at Aetrix Electronics and suitable for battery-powered electronics, portable medical devices, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX9648AXK+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 computing applications.

The MAX9647/MAX9648 family was developed to replace legacy comparators in space- and power-constrained portable systems - emphasizing low-voltage operation, small footprint, and built-in noise immunity without design overhead.

FAQ

What is the maximum supply voltage rating for MAX9648AXK+T?

The absolute maximum supply voltage (VDD to VSS) for MAX9648AXK+T is +6V. However, functional operation is specified only from +1.8V to +5.5V. Operating above +5.5V may cause permanent damage or parametric shift, and is outside the guaranteed performance envelope defined in the datasheet. Always limit VDD to ≤5.5V in production designs using MAX9648AXK+T.

Does MAX9648AXK+T require external hysteresis components?

No, MAX9648AXK+T includes 2mV of internal hysteresis, eliminating the need for external resistors or feedback networks. This fixed hysteresis is factory-trimmed and remains stable across –40°C to +125°C. Unlike the MAX9647 variant or LMX331, MAX9648AXK+T delivers noise-immune switching out-of-the-box - reducing design time and PCB area while improving reliability in real-world signal environments.

What is the output configuration of MAX9648AXK+T and how should it be interfaced?

MAX9648AXK+T features an open-drain NMOS output (Pin 4), requiring an external pull-up resistor to a logic-compatible voltage (1.8V–5.5V). It can sink up to 35mA while maintaining ≤400mV VOL across temperature. To interface, connect the pull-up to the target logic rail (e.g., 3.3V MCU I/O), select RL between 1kΩ and 10kΩ, and ensure the load does not exceed the sink current rating. This configuration enables level translation and wired-OR functionality - a key advantage of MAX9648AXK+T in mixed-voltage systems.

Is MAX9648AXK+T pin-compatible with LMX331H?

Yes, MAX9648AXK+T is explicitly documented as a drop-in, pin-for-pin compatible replacement for LMX331/LMX331H in both SC70 and SOT23 packages. Pin mapping (IN+, VSS, IN−, OUT, VDD), footprint dimensions, and electrical drive characteristics match - allowing direct substitution without PCB revision. However, MAX9648AXK+T adds internal hysteresis and lower supply current, providing immediate performance and reliability upgrades in existing LMX331H designs.

What is the input common-mode voltage range of MAX9648AXK+T?

The input common-mode voltage range of MAX9648AXK+T extends from –0.1V below VSS (i.e., –0.1V when VSS = 0V) to VDD – 0.7V. This rail-to-rail input capability allows direct connection to ground-referenced sensors, battery terminals, and DAC outputs without level-shifting circuitry. For example, with VDD = 3.3V, inputs can swing from –0.1V to +2.6V - a key enabler for low-voltage, high-accuracy threshold detection in MAX9648AXK+T applications.