Texas Instruments LM319MX/NOPB

Overview

LM319MX/NOPB from Texas Instruments is a high-speed dual comparator IC designed for precision threshold detection in industrial control, relay driving, and window monitoring circuits. It operates from single 5-V or dual ±15-V supplies, delivers 80-ns response time at ±15 V, supports up to 25 mA output sink per channel, and features uncommitted open-collector outputs compatible with TTL/DTL/RTL logic families.

For engineers reviewing the LM319MX/NOPB datasheet, LM319MX/NOPB pinout, LM319MX/NOPB application, or LM319MX/NOPB equivalent, key selection considerations include its 0°C to +70°C temperature range, SOIC-14 package, 8 mV max input offset voltage (LM319), 200 nA max input offset current, and compatibility with relay driver and window detector topologies requiring fast, rail-to-rail input common-mode range.

Technical Context

The LM319MX/NOPB implements two independent high-gain comparators on a single monolithic die, each with differential inputs and open-collector NPN output stages. Its architecture enables direct interface with logic families and discrete loads such as relays or lamps without external level-shifting circuitry.

It supports wide supply operation (±15 V or single 5 V), exhibits high common-mode slew rate, and allows input isolation from system ground-critical for noise-immune sensing in mixed-signal industrial environments where ground loops or transient coupling may occur.

Key Specifications

Pinout & Package

LM319MX/NOPB is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 8.75 mm × 4.0 mm body size, 1.75 mm max height, with gull-wing leads and RoHS-compliant matte tin (SN) lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM319MX/NOPB, LM393DR trades speed for ultra-low power and extended temperature range, while TLV3502IDR delivers extreme speed and rail-to-rail operation but sacrifices direct load-driving capability and legacy logic compatibility.

Availability

LM319MX/NOPB is available at Aetrix Electronics and suitable for industrial control panels, relay-based automation systems, and sensor interface modules requiring stable component supply across production lifecycles.

Supply support for LM319MX/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 conditioning and industrial-grade IC design.

The LM319MX/NOPB belongs to TI's legacy high-speed comparator family, engineered specifically for robust threshold detection in noisy industrial environments where reliability, wide supply tolerance, and direct load drive are essential.

FAQ

What is the maximum supply voltage for LM319MX/NOPB?

The LM319MX/NOPB supports a total supply voltage up to 36 V, with absolute maximum ratings specifying ±15 V dual supply or single 5 V operation. The datasheet explicitly warns against exceeding 16 V between ground and either supply rail to avoid damage. At ±15 V, the device achieves its specified 80-ns response time and full 25 mA output sink capability. Operating outside these limits risks permanent degradation of input stage integrity or output transistor reliability.

Does LM319MX/NOPB support single-supply operation?

Yes, LM319MX/NOPB fully supports single-supply operation at 5 V, as confirmed in Section 5.5 of the datasheet. With V+ = 5 V and V− = 0 V, it maintains functional input voltage range from 1 V to 3 V, 4.3 mA positive supply current, and 0.3–0.4 V saturation voltage under 3.2 mA sink load. This makes LM319MX/NOPB suitable for direct integration with 5-V microcontrollers and logic systems without negative rail generation.

What is the purpose of separate GND 1 and GND 2 pins on LM319MX/NOPB?

Pins 2 (GND 1) and 7 (GND 2) provide isolated ground references for the input stages of comparator 1 and comparator 2, respectively. This separation prevents shared-impedance coupling between channels, preserving accuracy in dual-threshold applications like window detectors or differential signal monitoring. The LM319MX/NOPB datasheet emphasizes this feature enables input isolation from system ground-a key advantage over single-ground comparators in noise-sensitive industrial designs.

Can LM319MX/NOPB drive a relay directly?

Yes, LM319MX/NOPB can drive a standard 12-V electromechanical relay directly via its open-collector outputs, which support up to 25 mA sink current per channel. When used with a 12-V pull-up resistor (e.g., 470 Ω), the output saturates below 1.5 V, ensuring reliable relay coil de-energization. The LM319MX/NOPB datasheet cites "relay driver" as a typical application, and its uncommitted collector architecture eliminates need for external transistor buffering in most medium-power relay scenarios.

What is the input common-mode voltage range for LM319MX/NOPB?

At ±15 V supply, the LM319MX/NOPB supports an input common-mode voltage range of ±13 V, meaning either input can swing from −13 V to +13 V relative to ground while maintaining valid comparison behavior. With single 5-V supply (V+ = 5 V, V− = 0), the usable range narrows to 1 V to 3 V. This wide common-mode capability allows LM319MX/NOPB to interface directly with high-side current sense amplifiers or transformer-coupled signals without attenuation or level-shifting networks.