Texas Instruments LP339DR

Overview

LP339DR from Texas Instruments is a low-power quadruple differential 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 such as power supply monitors and sensor signal conditioning circuits.

For engineers reviewing the LP339DR datasheet, LP339DR pinout, LP339DR application, or LP339DR equivalent, this page provides verified technical context, package-validated pin functions, real-world use cases, and two confirmed alternative comparators with documented functional and thermal differences.

Technical Context

The LP339DR implements four independent open-collector comparators with p-n-p input stages, supporting common-mode input voltages down to ground and up to VCC − 2 V across its full operating range. Its bimodal output stage operates in Darlington mode (30 mA sink at VO ≥ 1.5 V) and ground-emitter mode (700 µA sink at VO ≤ 0.4 V), enabling flexible load driving without external level-shifting.

Input bias current is −2.5 nA typ at 25°C, and input offset current is ±0.5 nA typ - critical for high-impedance sensing applications. The device features reverse-voltage protected power inputs and is characterized for stable operation from 3 V to 30 V supply rails, with no performance degradation over that range.

Key Specifications

Pinout & Package

LP339DR is housed in a 14-pin SOIC (D) package per JEDEC MS-012AB, with 1.27 mm lead pitch, 8.75 mm × 3.91 mm body, and 1.75 mm max height. Pin 1 is marked by a beveled corner and located in Quadrant Q1 of the tape reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and LP2901DR, the LP339DR provides identical pin-compatible functionality at 0°C–70°C with tighter input offset voltage specification (±5 mV max) - making it the most cost-effective choice for commercial instrumentation and consumer electronics where extended temperature range is unnecessary.

Availability

LP339DR is available at Aetrix Electronics and suitable for power supply monitoring, sensor interface, LED driver control, and logic-level translation applications requiring stable component supply across production lifecycles.

Supply support for LP339DR 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, embedded processing, and connectivity technologies, with decades of expertise in precision analog IC design and high-volume manufacturing.

The LP339DR belongs to TI's legacy low-power comparator family, engineered specifically for single-supply, ground-sensing, CMOS-compatible applications in cost-sensitive industrial and consumer systems.

FAQ

What is the maximum supply voltage rating for the LP339DR?

The LP339DR has an absolute maximum supply voltage of 36 V, with recommended operation from 3 V to 30 V. This wide range allows direct use with common industrial rails including 5 V, 12 V, and 24 V systems without regulation. Exceeding 36 V may cause permanent damage, and operation above 30 V is not guaranteed per specifications. The LP339DR maintains stable performance across its entire 3–30 V operating window, with supply current remaining near 60 µA typical regardless of rail voltage.

Does the LP339DR support true ground-referenced inputs?

Yes, the LP339DR supports common-mode input voltages down to 0 V - meaning both IN+ and IN− terminals can operate at ground potential without phase reversal or malfunction. This is enabled by its p-n-p input stage and is explicitly specified in the datasheet as "common-mode input voltage includes ground." In practice, this allows direct connection of resistive sensors (e.g., thermistors, potentiometers) referenced to system ground without level-shifting circuitry - a key advantage over many rail-to-rail input comparators that require a minimum headroom above ground.

Can multiple LP339DR outputs be connected together?

Yes, LP339DR outputs are open-collector and fully compatible with wired-OR (dot-logic) configurations. Since all four outputs share no internal connection, they can be tied together with a single pull-up resistor to any voltage ≤30 V - enabling simple logic functions like alarm prioritization or fault-bus signaling. This behavior is explicitly supported in the datasheet and used in standard applications such as window comparators and priority encoders. No additional isolation components are required, and the bimodal output architecture ensures consistent sink strength across combined nodes.

What is the output sink current capability of the LP339DR at different output voltages?

The LP339DR exhibits bimodal output behavior: it sinks 30 mA at VO = 2 V (Darlington mode), but only ~700 µA at VO = 0.4 V (ground-emitter mode). This transition occurs near 1.5 V and is inherent to its internal transistor structure - not a limitation. For driving LEDs or relays, operate in the >1.5 V region; for precise low-voltage switching (e.g., logic gate inputs), the low-current mode ensures minimal loading. The datasheet confirms this behavior with test conditions specifying VO = 2 V for 30 mA and VO = 0.4 V for 700 µA - both validated across the full 0°C–70°C range.

Is the LP339DR pin-compatible with other TI quad comparators?

Yes, the LP339DR is pin-for-pin compatible with LM239, LM339, and LM2901 in SOIC-14 (D) packages - sharing identical pin assignments for all 14 terminals. This allows drop-in replacement in existing designs without layout changes, provided temperature and offset voltage requirements align. However, note that LM239 is obsolete, LM339DR extends the temperature range to −40°C–85°C, and LP2901DR adds automotive qualification. The LP339DR retains the tightest input offset voltage spec (±5 mV max) within the commercial temperature grade, making it ideal for precision thresholding where cost and temp range permit.