Analog Devices Inc./Maxim Integrated LMX339AUD+T

Overview

LMX339AUD+T from Maxim Integrated is a quad, open-drain, low-voltage comparator with internal 2mV hysteresis, operating from 1.8V to 5.5V supply and rated for -40°C to +125°C automotive temperature range. It delivers 140–200µA total supply current at 5V, 70–140ns propagation delay (100mV overdrive), and 100mV output saturation voltage at 1mA sink, enabling robust level detection in battery-powered automotive sensor interfaces.

For engineers reviewing the LMX339AUD+T datasheet, LMX339AUD+T pinout, LMX339AUD+T application, or LMX339AUD+T equivalent, key selection criteria include guaranteed hysteresis, rail-to-rail input common-mode range including ground, open-drain output compatibility with mixed-voltage logic, and TSSOP-14 packaging for high-density PCB layouts in space-constrained embedded systems.

Technical Context

The LMX339AUD+T implements four independent comparators on a single die using submicron CMOS process, eliminating phase reversal under overdriven inputs and supporting input common-mode voltages down to -0.1V (below VSS) and up to 4.2V (at 5V supply). Its internal hysteresis is fixed at 2mV and stable across temperature (-40°C to +125°C) and supply voltage (1.8V–5.5V), ensuring consistent noise immunity without external components.

Each comparator features open-drain output capable of sinking ≥10mA at VO ≤ 1.5V (5V supply), with output saturation voltage ≤100mV at 1mA sink and ≤700mV at 4mA sink. Input offset voltage is specified at ≤9mV over full temperature range, and PSRR reaches 60–70dB across 1.8V–5.5V operation.

Key Specifications

Pinout & Package

LMX339AUD+T is housed in a 14-pin TSSOP package (4.4mm × 5.0mm × 1.2mm, 0.65mm pitch), optimized for automated assembly and thermal performance in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV339IDR and TLV339IPWR, the LMX339AUD+T uniquely combines factory-trimmed 2mV hysteresis, -40°C to +125°C operation, and 140–200µA total supply current in TSSOP-14 - delivering plug-in reliability for safety-critical automotive and industrial monitoring where external component count and temperature margin are design constraints.

Availability

LMX339AUD+T is available at Aetrix Electronics and suitable for automotive battery management, portable device power sequencing, industrial sensor interfaces, and motor control fault detection requiring stable component supply across extended temperature and voltage ranges.

Supply support for LMX339AUD+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, mixed-signal, and power-management ICs for automotive, industrial, and communications markets, emphasizing high reliability and extended environmental operation.

The LMX339AUD+T belongs to Maxim's LMX331/LMX393/LMX339 family of tiny-pack comparators, engineered specifically for low-voltage, high-density applications where hysteresis, temperature resilience, and minimal board space are critical - such as ECU subsystems and portable medical electronics.

FAQ

What is the maximum supply voltage for LMX339AUD+T?

The absolute maximum supply voltage for LMX339AUD+T is +6V (VDD to VSS), but the recommended operating range is 1.8V to 5.5V. Operation above 5.5V risks permanent damage, while operation below 1.8V may cause undefined behavior or failure to meet specifications such as propagation delay and output saturation voltage. The LMX339AUD+T is fully characterized and guaranteed across the 1.8V–5.5V range, including hysteresis stability and input common-mode range.

Does LMX339AUD+T require external hysteresis components?

No, the LMX339AUD+T includes internal 2mV hysteresis as a standard feature - no external resistors or capacitors are needed to achieve noise immunity. This hysteresis is factory-trimmed, stable across -40°C to +125°C and 1.8V–5.5V supply, and applies to all four comparators. External hysteresis networks are only necessary if a different hysteresis value or asymmetric thresholds are required beyond the fixed 2mV band.

Can LMX339AUD+T drive a 3.3V logic input directly?

Yes, the LMX339AUD+T's open-drain outputs can interface directly with 3.3V logic inputs when used with an appropriate pull-up resistor (typically 4.7kΩ–10kΩ to 3.3V). At 1mA sink, the output saturation voltage remains ≤100mV, ensuring a valid logic-low level. The input common-mode range includes ground and extends to 4.2V at 5V supply, allowing direct connection to 3.3V reference sources without attenuation.

Is LMX339AUD+T pin-compatible with LMV339?

Yes, LMX339AUD+T is a drop-in, pin-for-pin compatible replacement for LMV339 in TSSOP-14 packages. Pin assignments, footprint, and solder pad layout match exactly. However, LMX339AUD+T adds internal hysteresis and extends the operating temperature range to -40°C to +125°C, whereas LMV339 is rated only to +85°C and lacks built-in hysteresis - making LMX339AUD+T a functional upgrade without PCB changes.

What is the typical propagation delay of LMX339AUD+T at 3.3V supply?

At 3.3V supply, the LMX339AUD+T exhibits typical propagation delays of approximately 120ns (tPHL) and 150ns (tPLH) with 100mV input overdrive, interpolated from the 2.7V and 5.0V characterization data. These values remain within the guaranteed 90–200ns range specified across the full 1.8V–5.5V operating window, supporting reliable edge detection in 5–10MHz timing-critical applications such as PWM fault monitoring.