STMicroelectronics LM339ADT

Overview

LM339ADT from STMicroelectronics is a low-power quad voltage comparator in SO14 package, designed for single-supply operation from +2 V to +36 V (or ±1 V to ±18 V dual supply), featuring ±1 mV typical input offset voltage, 1.1 mA supply current, and rail-to-rail input common-mode range including ground. It delivers TTL/CMOS-compatible open-collector outputs with 250 mV typical sink saturation voltage at 4 mA, enabling direct interfacing with logic families in industrial sensing and power monitoring circuits.

For engineers reviewing the LM339ADT datasheet, LM339ADT pinout, LM339ADT application, or LM339ADT equivalent, key selection criteria include input offset voltage stability over temperature, output sink capability under varying load conditions, common-mode input range compatibility with grounded reference designs, and SO14 thermal performance in convection-cooled PCB layouts.

Technical Context

This device integrates four independent comparators with PNP differential input stages, enabling input voltages down to –0.3 V relative to ground while operating from a single positive supply. Its input bias current remains constant (25 nA typ) regardless of output state, eliminating reference-line loading effects in precision threshold detection.

The open-collector outputs support wired-OR configurations and level translation across logic families. Differential input voltage range equals full supply voltage (±36 V), allowing inputs to exceed VCC without damage-provided the lower input stays ≥ –0.3 V and common-mode range (0 V to VCC – 1.5 V) is respected.

Key Specifications

Pinout & Package

LM339ADT is housed in a 14-pin SOIC (SO14) plastic micropackage per ECOPACK® standards, with 1.27 mm pitch, 8.75 mm body length, and 4.0 mm width. Thermal resistance junction-to-ambient is 105 °C/W under natural convection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DT, LM339ADT offers tighter offset and drift specs for precision thresholding; versus TLC374CDR, it retains legacy open-collector flexibility and proven robustness in industrial noise environments-making it optimal for retrofit and high-reliability designs.

Availability

LM339ADT is available at Aetrix Electronics and suitable for industrial power monitoring, motor control safety interlocks, and embedded battery management systems requiring stable component supply across extended temperature ranges (0 °C to +70 °C).

Supply support for LM339ADT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and environmental compliance focus.

LM339ADT belongs to ST's legacy precision analog comparator product line, engineered for reliability in harsh industrial environments and backward compatibility with decades-old designs requiring minimal redesign effort.

FAQ

Can LM339ADT operate from a single 3.3 V supply?

Yes, LM339ADT supports single-supply operation down to +2 V. At 3.3 V, its input common-mode range extends from 0 V to 1.8 V, and output saturation remains below 400 mV at 4 mA sink-ensuring compatibility with 3.3 V logic families when paired with appropriate pull-up resistors.

Does LM339ADT require external hysteresis for noise immunity?

Yes-LM339ADT has no internal hysteresis. For noisy input signals (e.g., from inductive sensors), external positive feedback (e.g., 10 MΩ resistor from output to non-inverting input) must be added to prevent multiple toggling near threshold. Typical hysteresis width is set by resistor ratio and output swing.

What is the maximum sink current per output of LM339ADT?

Each output can continuously sink up to 16 mA (per datasheet Table 3, ISINK parameter). Absolute maximum rating is 20 mA, but sustained operation above 16 mA increases junction temperature and may degrade long-term reliability-especially in SO14 packages without heatsinking.

Is LM339ADT pin-compatible with LM239ADT or LM139ADT?

Yes-LM339ADT, LM239ADT, and LM139ADT share identical SO14 pinouts and electrical behavior. Their differences lie solely in specified operating temperature ranges (0–70 °C, –40–105 °C, and –55–125 °C respectively) and guaranteed offset voltage limits, not pin function or layout.