Texas Instruments LP339N

Overview

LP339N from Texas Instruments is a low-power quadruple voltage comparator IC designed for single-supply operation in 0°C to 70°C industrial environments. It delivers 60 µA typical supply current, ±2 mV input offset voltage, and 30 mA output sink capability at VO = 2 V - enabling reliable threshold detection in battery-powered and CMOS-interfaced systems.

For engineers reviewing the LP339N datasheet, LP339N pinout, LP339N application, or LP339N equivalent, key selection criteria include its rail-to-rail common-mode input range (including ground), uncommitted open-collector outputs compatible with MOS/CMOS logic, and pin-for-pin compatibility with LM339 and LM2901 in PDIP-14 packaging.

Technical Context

The LP339N integrates four independent comparators with p-n-p input stages enabling ground-sensing operation and reverse-voltage protected power inputs. Its bimodal Darlington/ground-emitter output stage provides 30 mA sink current above VO = 1.5 V and ~700 µA below VO = 0.4 V - supporting direct LED or relay drive without external transistors.

Input bias current is −2.5 nA (typ) and input offset current is ±0.5 nA (typ), ensuring minimal loading on high-impedance reference sources. Common-mode input range extends from ground to VCC − 2 V across full temperature range, and differential input voltage tolerance reaches ±36 V - allowing safe operation with overvoltage transients.

Key Specifications

Pinout & Package

LP339N is housed in a 14-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 80°C/W, supporting up to 656 mW dissipation at TA = 70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339N, LP339N reduces quiescent current by 96% while maintaining pin compatibility and output drive - making it optimal for energy-constrained systems. Against LP2901N, LP339N trades extended temperature range for lower cost and tighter inventory availability in commercial-grade applications.

Availability

LP339N is available at Aetrix Electronics and suitable for overvoltage protection circuits, battery fuel gauging, and industrial temperature monitoring requiring stable component supply across long production lifecycles.

Supply support for LP339N 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, embedded processing, and connectivity solutions with emphasis on reliability and broad application coverage.

The LP339N belongs to TI's legacy low-power comparator product line, engineered specifically for single-supply, CMOS-compatible threshold detection in cost-sensitive industrial and consumer systems.

FAQ

What is the maximum supply voltage rating for LP339N?

The LP339N has an absolute maximum supply voltage (VCC) rating of 36 V. It operates reliably across a recommended range of 3 V to 30 V. Exceeding 36 V risks permanent damage, and operation above 30 V is outside specified performance limits - always observe derating guidelines per the dissipation rating table when operating near thermal limits.

Does LP339N support rail-to-rail input operation?

Yes, the LP339N supports rail-to-rail common-mode input voltage from ground (0 V) up to VCC − 2 V across its full 0°C to 70°C operating range. This allows direct sensing of signals referenced to ground or near-VCC without level shifting - a key enabler for single-supply sensor interfaces and battery monitoring circuits using the LP339N.

Can multiple LP339N outputs be wired together?

Yes, LP339N outputs are open-collector and can be wire-OR'd to implement dot-logic functions such as NAND or NOR gates. When connecting multiple outputs, use a single shared pull-up resistor to the desired logic voltage (≤36 V). Ensure total sink current does not exceed device limits - each LP339N output can sink up to 30 mA individually, but parallel operation requires current sharing analysis.

Is LP339N pin-compatible with LM339?

Yes, LP339N is explicitly specified as pin-for-pin compatible with LM339 in the PDIP-14 package. Both share identical pin assignments, electrical interface behavior, and mechanical footprint - enabling direct substitution in existing LM339-based designs to achieve 96% quiescent current reduction without layout changes or revalidation.

What is the typical input offset voltage of LP339N at room temperature?

The typical input offset voltage of LP339N is ±2 mV at 25°C, with a maximum of ±5 mV across the full 0°C to 70°C operating range. This specification is measured under standard conditions (VCC = 5 V to 30 V, VO = 2 V) and directly impacts accuracy in precision threshold-detection applications - for example, enabling reliable 5 mV window detection in battery voltage monitors using the LP339N.