Texas Instruments LM339AN/NOPB

Overview

LM339AN/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 operates from 2 V to 36 V single supply (or ±1 V to ±18 V dual supply). Its input common-mode range includes ground, enabling direct sensing of near-zero-voltage signals in battery-powered or single-rail systems.

For engineers reviewing the LM339AN/NOPB datasheet, LM339AN/NOPB pinout, LM339AN/NOPB application, or LM339AN/NOPB equivalent, key selection considerations include its rail-to-rail input capability down to GND, TTL/CMOS-compatible open-collector outputs, low power consumption suitable for portable designs, and robust operation across −40°C to +85°C industrial temperature range.

Technical Context

The LM339AN/NOPB integrates four independent high-gain comparators with PNP differential input stages, enabling input voltages to extend to ground even under single-supply operation. Its uncommitted NPN output transistors support wired-OR logic, level-shifting up to 36 V, and sink currents up to 16 mA - all while maintaining sub-1 nA output leakage in the OFF state.

It uses no antisaturation clamps, resulting in minimal output loading during inactive states. The bias network delivers supply-independent current draw over 2–36 V, and differential input voltage tolerance exceeds V+ (up to 36 V) without damage - provided inputs stay ≥ −0.3 V.

Key Specifications

Pinout & Package

LM339AN/NOPB is supplied in a 14-pin plastic DIP (PDIP) package measuring 19.177 mm × 6.35 mm, with through-hole mounting and industry-standard lead spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339AN/NOPB, LM339DR offers identical performance in a compact SOIC package for volume production, while LM2901DT provides enhanced thermal robustness and tighter offset for mission-critical sensing - neither is pin-compatible with LM339AN/NOPB's PDIP layout, but all share identical functional pinout and electrical behavior.

Availability

LM339AN/NOPB is available at Aetrix Electronics and suitable for industrial control systems, battery management units, and embedded sensor interfaces requiring stable component supply across long product lifecycles.

Supply support for LM339AN/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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and industrial-grade components.

The LM339AN/NOPB belongs to TI's legacy quad comparator family, engineered for rugged, low-cost signal comparison in industrial automation, power supplies, and sensor interface circuits where reliability and wide supply range are essential.

FAQ

What is the maximum supply voltage for LM339AN/NOPB?

The LM339AN/NOPB supports a maximum supply voltage of 36 VDC in single-supply mode or ±18 VDC in dual-supply mode. This rating applies across its full operating temperature range (−40°C to +85°C), and the device tolerates differential input voltages up to 36 V - even exceeding V+ - as long as input pins remain ≥ −0.3 VDC relative to ground. Exceeding 36 V risks permanent damage to the internal structure.

Does LM339AN/NOPB require a dual power supply?

No, LM339AN/NOPB is specifically designed for single-supply operation, with an input common-mode voltage range that includes ground (0 V) up to V+−1.5 V. This eliminates the need for a negative rail in most applications. Dual-supply operation (±1 V to ±18 V) is supported but optional - used primarily when interfacing with bipolar analog signals or legacy split-rail systems.

Can LM339AN/NOPB drive TTL or CMOS logic directly?

Yes, LM339AN/NOPB outputs are open-collector NPN transistors compatible with TTL, DTL, ECL, MOS, and CMOS logic families. When paired with an appropriate pull-up resistor (e.g., 1–10 kΩ to VCC or another logic supply), it sinks current to assert LOW and floats to allow external circuitry to define HIGH - enabling seamless level translation and wired-OR logic implementation.

What is the input offset voltage specification for LM339AN/NOPB?

The LM339AN/NOPB has a maximum input offset voltage of ±3 mV at 25°C, with typical values around 1 mV. This specification is guaranteed across the full operating temperature range and ensures accurate threshold detection in precision applications such as battery voltage monitoring or transducer signal conditioning where small voltage differences matter.

How does the open-collector output of LM339AN/NOPB affect circuit design?

The open-collector output of LM339AN/NOPB requires an external pull-up resistor to establish a defined HIGH logic level. This design enables flexible voltage translation (e.g., 5 V input compared, 12 V output pulled), wired-OR logic combining multiple comparators, and direct interface with higher-voltage loads. Without the pull-up, the output remains floating and cannot drive logic HIGH - a fundamental requirement for correct operation.