Texas Instruments LM339M

Overview

LM339M from Texas Instruments is a quad open-collector voltage comparator IC designed for industrial analog-to-digital interface applications. It features ±3 mV maximum input offset voltage, 0.8 mA typical supply current per comparator, and rail-to-rail input common-mode range including ground - enabling direct sensing near 0 V on single-supply systems. Used in limit detection, window comparators, and TTL/CMOS-compatible logic generation.

For engineers reviewing the LM339M datasheet, LM339M pinout, LM339M application, or LM339M equivalent, key selection considerations include its open-collector output architecture, wide 2–36 VDC supply range, low input bias current (25 nA), and compatibility with wired-OR configurations across multiple comparators.

Technical Context

The LM339M implements four independent high-gain comparators with PNP differential input stages, allowing input voltages to reach ground even under single-supply operation. Its uncommitted NPN output transistors support sinking up to 16 mA with 250 mV saturation voltage at 4 mA load.

Input common-mode range spans 0 V to V+ − 1.5 V (at 25°C); differential input voltage may exceed V+ without damage, provided negative excursions are limited to −0.3 V. Bias current remains stable across 2–36 V supply, enabling battery-powered and industrial rail-flexible designs.

Key Specifications

Pinout & Package

LM339M is supplied in a 14-pin SOIC package (8.65 mm × 3.91 mm body size), optimized for surface-mount industrial PCBs with thermal resistance R_θJA = 95°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339M, LM339DR offers identical functionality in production-ready packaging, while LM2901DT extends thermal capability at no cost to precision or power - making LM339M optimal for cost-sensitive commercial-grade applications within 0–70°C.

Availability

LM339M is available at Aetrix Electronics and suitable for industrial automation, battery management, and sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for LM339M 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 90 years of innovation in precision analog ICs.

The LM339M belongs to TI's legacy quad comparator product line, engineered for robust, low-cost analog decision-making in industrial, automotive, and consumer systems where reliability and wide supply tolerance are critical.

FAQ

What is the maximum supply voltage for LM339M?

The LM339M supports a maximum supply voltage of 36 VDC in single-supply mode or ±18 VDC in dual-supply mode. Absolute maximum ratings specify 36 V across V+ and GND; exceeding this risks permanent damage. Operation above 30 V should include derating per thermal guidelines, especially in SOIC packages with R_θJA = 95°C/W.

Does LM339M have internal pull-up resistors on its outputs?

No, LM339M does not include internal pull-up resistors. Its outputs are open-collector NPN transistors requiring external pull-up resistors to define HIGH-state voltage levels. This architecture enables flexible logic interfacing - for example, pulling up to 5 V for TTL or 3.3 V for CMOS - and supports wired-OR configurations across multiple comparators or devices.

Can LM339M operate with input voltages below ground?

LM339M input pins tolerate a minimum voltage of −0.3 VDC relative to GND at 25°C. Driving inputs more negative than this risks forward-biasing internal PNP input stage junctions, causing temporary output anomalies and increased leakage. For sub-ground signal handling, external clamping diodes or level-shifting circuitry must be added before the LM339M inputs.

What is the typical response time of LM339M?

The LM339M exhibits a typical large-signal response time of 300 ns for a 100-mV input step with 5-mV overdrive, measured under V+ = 5 VDC and TA = 25°C. With higher overdrive (e.g., >1 V), response improves to ~300 ns for both rising and falling edges. This makes it suitable for medium-speed timing, pulse generation, and basic waveform shaping up to ~1 MHz.

Is LM339M pin-compatible with LM339N or LM339AN?

Yes, LM339M is pin-compatible with LM339N (PDIP-14) and LM339AN (CDIP-14) - all share identical 14-pin functional pinout and electrical behavior. Differences lie only in package type (SOIC vs PDIP vs CDIP), thermal characteristics, and temperature grade (LM339M rated 0°C to 70°C, matching LM339N/LM339AN). No PCB redesign is needed when substituting between these variants.