Texas Instruments LM392N/NOPB

Overview

LM392N/NOPB from Texas Instruments is a dual-function integrated circuit combining one internally frequency-compensated operational amplifier and one precision voltage comparator in a single 8-pin PDIP package. It operates from 3V to 32V single supply or ±1.5V to ±16V dual supply, draws only 600 μA supply current, features 2 mV input offset voltage and rail-to-rail input common-mode range down to ground-enabling transducer amplification and level detection in battery-powered sensor interfaces.

For engineers reviewing the LM392N/NOPB datasheet, LM392N/NOPB pinout, LM392N/NOPB application, or LM392N/NOPB equivalent, key selection considerations include its dual op-amp/comparator integration, ground-sensing capability on single supply, TTL/CMOS-compatible comparator output, and pin compatibility with LM358 and LM393 for drop-in replacement in legacy analog signal conditioning designs.

Technical Context

The LM392N/NOPB integrates two independent building-block circuits: a high-gain (100 dB), unity-gain-stable op amp with 1 MHz bandwidth and 0 V to V₊−1.5 V output swing; and a precision comparator with 250 mV saturation voltage at 4 mA sink current and 300 ns large-signal response time under TTL logic swing conditions.

Both circuits share a common power supply and feature PNP-input stages enabling input common-mode voltage down to ground on single supply, while maintaining differential input voltage range equal to the full supply voltage and low input bias current (50 nA typical) for high-impedance source interfacing.

Key Specifications

Pinout & Package

LM392N/NOPB is housed in an 8-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole mounting footprint per JEDEC MS-001. Pin 1 is located at the left end of the top row when viewed from the top with notch or dot orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar op-amp/comparator combination applications.

Compared with LM392N/NOPB, LM393DR offers higher comparator speed but no amplification capability, while LM2904DR provides extended temperature operation but no built-in comparator-making LM392N/NOPB uniquely suited for compact, low-power analog front-ends requiring both functions in one device.

Availability

LM392N/NOPB is available at Aetrix Electronics and suitable for temperature monitoring systems, portable battery voltage monitors, DC motor speed control feedback, and industrial 4–20 mA loop level detectors requiring stable component supply and long-term obsolescence management.

Supply support for LM392N/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, embedded processing, and connectivity technologies, with decades of heritage in precision analog IC design.

The LM392N/NOPB belongs to TI's legacy precision analog building-block family, designed specifically for cost-sensitive industrial, automotive, and consumer applications requiring integrated op-amp/comparator functionality with ground-sensing capability and low power consumption.

FAQ

What is the maximum supply voltage rating for LM392N/NOPB?

The LM392N/NOPB supports a maximum supply voltage of 32 V on single supply or ±16 V on dual supply, as specified in its Absolute Maximum Ratings table. This allows direct use in 24 V industrial control systems and high-voltage sensor signal conditioning without external regulators. Exceeding 32 V may cause permanent damage to the LM392N/NOPB internal circuitry.

Does LM392N/NOPB support single-supply operation with input signals down to ground?

Yes, the LM392N/NOPB features PNP-input stages that enable its input common-mode voltage range to include ground (0 V) on single supply. Both the op amp and comparator inputs operate correctly when referenced to GND, making the LM392N/NOPB ideal for interfacing with ground-referenced sensors like thermistors or current shunts without level-shifting circuitry.

Is LM392N/NOPB pin-compatible with LM358 or LM393 devices?

Yes, the LM392N/NOPB uses the same 8-pin PDIP pinout as both the LM358 dual op amp and LM393 dual comparator. This allows direct PCB replacement in existing designs-adding comparator functionality where only op amps were previously used, or vice versa-without layout changes, provided the application leverages the specific dual-function capability of the LM392N/NOPB.

What is the typical supply current draw of LM392N/NOPB at 5 V supply?

The LM392N/NOPB draws a typical supply current of 600 μA at 5 V, as confirmed in the "Low Supply Current Drain" feature list and Electrical Characteristics table. This value remains essentially constant across the full supply voltage range, enabling predictable power budgeting in battery-operated equipment and ensuring stable operation in low-noise analog signal chains.

Can LM392N/NOPB drive TTL or CMOS logic directly from its comparator output?

Yes, the comparator output of LM392N/NOPB is open-collector and rated for 250 mV saturation voltage at 4 mA sink current, making it fully compatible with TTL and CMOS logic families when used with an appropriate pull-up resistor. The LM392N/NOPB comparator output can directly assert logic-low states and interface with microcontroller GPIO pins or digital logic gates without additional buffering.