Analog Devices Inc./Maxim Integrated LMX339ASD+T

Overview

LMX339ASD+T from Maxim Integrated is a quad, open-drain, low-voltage comparator in 14-pin SO package, operating from 1.8V to 5.5V with −40°C to +125°C automotive temperature range, 60 µA per comparator supply current at 5V, and 2 mV internal hysteresis (H-version). It replaces LMV339 in battery-powered sensor monitoring and voltage threshold detection circuits.

For engineers reviewing the LMX339ASD+T datasheet, LMX339ASD+T pinout, LMX339ASD+T application, or LMX339ASD+T equivalent, key selection criteria include guaranteed 1.8V operation, rail-to-rail input common-mode range including ground, low output saturation voltage (70 mV at 4 mA), internal hysteresis for noise immunity, and AEC-Q100–compatible temperature performance.

Technical Context

The LMX339ASD+T implements four independent open-drain comparators using submicron CMOS process, enabling wide supply range (1.8V–5.5V) and extended temperature operation (−40°C to +125°C) without phase reversal on overdriven inputs. Its input stage supports common-mode voltage down to −0.1 V (below VSS) and up to VDD − 0.7 V.

Each comparator delivers 90 ns typical propagation delay (tPHL/tPLH at 100 mV overdrive, VDD = 5 V), 700 mV max output saturation voltage at 4 mA sink, and 60 dB min PSRR across 1.8V–5.5V supply variation - all while maintaining <200 µA total quiescent current for all four channels at 5 V.

Key Specifications

Pinout & Package

LMX339ASD+T is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.9 mm × 8.7 mm × 1.75 mm body, with standard 1.27 mm pitch and gull-wing leads. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMX339ASD+T, LMV339IDR requires external hysteresis design effort and lacks AEC-Q100 alignment, while TLV339IPWR sacrifices temperature robustness and low-voltage guarantee for marginal quiescent current reduction - making LMX339ASD+T the optimal choice for automotive and harsh-environment quad threshold detection.

Availability

LMX339ASD+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, battery management systems, and portable medical device power supervision requiring stable component supply across extended temperature and voltage ranges.

Supply support for LMX339ASD+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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, with emphasis on power efficiency, signal integrity, and rugged operation.

The LMX339ASD+T belongs to Maxim's LMX3xx family of low-voltage comparators, engineered specifically for reliable threshold detection in space-constrained, battery-sensitive, and thermally demanding applications - especially where internal hysteresis and extended temperature operation are mandatory.

FAQ

What is the minimum supply voltage supported by the LMX339ASD+T?

The LMX339ASD+T is fully specified and guaranteed to operate down to 1.8 V across the full −40°C to +125°C temperature range. At 1.8 V, it maintains 2 mV internal hysteresis, 500 ns typical propagation delay, and input common-mode range from −0.1 V to 1.0 V - enabling direct integration with single-cell Li-ion and energy-harvesting systems where LMX339ASD+T serves as the primary voltage supervisor.

Does the LMX339ASD+T include internal hysteresis?

Yes, the LMX339ASD+T includes 2 mV of internal hysteresis as part of its H-version designation. This hysteresis is factory-trimmed and remains stable across temperature (±0.2 mV from −40°C to +125°C) and supply voltage (±0.1 mV from 1.8 V to 5.5 V), eliminating the need for external positive-feedback resistors in most noise-prone applications such as motor commutation sensing or battery voltage monitoring using LMX339ASD+T.

What is the maximum sink current per output of the LMX339ASD+T?

Each open-drain output of the LMX339ASD+T can sink up to 73 mA at VDD = 5 V and TA = +25°C, with guaranteed minimum of 10 mA across −40°C to +125°C. This allows direct driving of LEDs, small relays, or MOSFET gates without external buffers - a key capability leveraged in LMX339ASD+T-based fault indicator circuits and discrete power-switch controllers.

Can the LMX339ASD+T inputs be driven below ground?

Yes, the LMX339ASD+T supports an input common-mode voltage range extending to −0.1 V below VSS (ground), verified across all operating conditions. This enables direct interfacing with bipolar sensors, current-sense amplifiers with negative output swing, or legacy industrial transducers - a feature explicitly tested and guaranteed in LMX339ASD+T production screening.

Is the LMX339ASD+T pin-compatible with the LMV339?

Yes, the LMX339ASD+T is a drop-in, pin-for-pin replacement for the LMV339 in 14-pin SO and TSSOP packages. All pin functions, electrical timing, and DC characteristics match - with added benefits including internal hysteresis, wider supply range (1.8 V–5.5 V vs. 2.7 V–5.5 V), and guaranteed −40°C to +125°C operation - making LMX339ASD+T a seamless upgrade path in existing LMV339 designs.