Texas Instruments LM339N/NOPB

Overview

LM339N/NOPB from Texas Instruments is a quad open-collector voltage comparator IC designed for industrial and embedded signal conditioning. 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 precise threshold detection in single-supply systems such as battery-powered sensors and power supply monitors.

For engineers reviewing the LM339N/NOPB datasheet, LM339N/NOPB pinout, LM339N/NOPB application, or LM339N/NOPB equivalent, this device supports TTL/CMOS interfacing, wired-OR logic, window comparators, and analog-to-digital conversion with stable operation from 2 V to 36 V DC supply.

Technical Context

The LM339N/NOPB integrates four independent high-gain comparators with PNP input stages, enabling input common-mode voltage down to GND even on single supplies. Its uncommitted NPN output transistors support open-collector configurations with pull-up voltages up to 36 V and sink currents up to 16 mA.

It operates across 0°C to 70°C ambient temperature, exhibits 300 ns large-signal response time under TTL-level overdrive, and maintains low input bias current (25 nA) and low input offset current (±5 nA), making it suitable for high-impedance reference and sensor interface circuits.

Key Specifications

Pinout & Package

LM339N/NOPB is supplied in a 14-pin plastic dual in-line package (PDIP) with 19.177 mm × 6.35 mm body size and through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and LM2901N, the LM339N/NOPB offers the lowest input offset voltage (±3 mV) in a through-hole package, delivering superior threshold accuracy for lab equipment and benchtop instruments where manual assembly and calibration stability are prioritized.

Availability

LM339N/NOPB is available at Aetrix Electronics and suitable for industrial control systems, battery management units, and sensor interface modules requiring stable component supply across long product lifecycles.

Supply support for LM339N/NOPB 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 decades of expertise in precision signal chain components.

The LM339N/NOPB belongs to TI's legacy quad comparator product line, engineered for robustness, wide supply flexibility, and seamless interoperability with TTL/CMOS logic in industrial and instrumentation applications.

FAQ

What is the operating temperature range for LM339N/NOPB?

The LM339N/NOPB is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification makes it ideal for indoor industrial equipment, consumer electronics, and laboratory instruments where environmental extremes are not expected. The device's thermal characteristics-including 95°C/W junction-to-ambient resistance-are validated within this range, ensuring reliable performance without derating under normal airflow conditions.

Can LM339N/NOPB operate from a single 3.3 V supply?

Yes, LM339N/NOPB supports single-supply operation down to 2 V DC, so it functions correctly at 3.3 V. At this voltage, its input common-mode range extends from GND to approximately 1.8 V, and output saturation remains below 250 mV at 4 mA load-ensuring clean logic-low levels compatible with 3.3 V digital interfaces. Input bias current stays at 25 nA, preserving accuracy in low-voltage sensor front-ends.

Does LM339N/NOPB require external pull-up resistors on its outputs?

Yes, LM339N/NOPB has open-collector NPN outputs and requires external pull-up resistors to define HIGH-state voltage levels. Typical values range from 1 kΩ to 10 kΩ depending on speed and drive requirements. Pull-up to 3.3 V, 5 V, or up to 36 V is supported-enabling direct interfacing with mixed-voltage logic families without level shifters.

How does the input common-mode range of LM339N/NOPB benefit ground-referenced sensing?

The LM339N/NOPB input common-mode range includes GND, meaning both inputs can be biased at or near 0 V while powered from a single positive supply. This eliminates the need for level-shifting circuitry when monitoring signals like thermocouple outputs, current-sense amplifier outputs, or battery voltages-all referenced to system ground-reducing component count and improving measurement fidelity.

Is LM339N/NOPB pin-compatible with LM2901N?

Yes, LM339N/NOPB and LM2901N share identical PDIP-14 pinouts and core electrical functionality, including open-collector outputs and quad comparator topology. However, LM2901N specifies wider temperature range (−40°C to +85°C) and higher input offset voltage (7 mV max), so direct substitution is acceptable only if the application's thermal and accuracy requirements align with LM2901N's specifications.