Texas Instruments LM393N

Overview

LM393N from Texas Instruments is a dual, low-power, precision voltage comparator IC with open-collector outputs, designed for single-supply operation from 2.0 V to 36 V or dual supplies (±1.0 V to ±18 V). It features ±3 mV maximum input offset voltage, 0.4 mA supply current at 5 V, 25 nA input bias current, and input common-mode range extending to ground - enabling threshold detection in battery-powered sensors and industrial level-shifting interfaces.

For engineers reviewing the LM393N datasheet, LM393N pinout, LM393N application, or LM393N equivalent, this page delivers verified electrical specifications, SOIC-8 package layout, real-world use cases including zero-crossing detection and hysteresis-based limit switching, and validated alternative parts with documented functional and thermal differences.

Technical Context

The LM393N integrates two independent PNP-input comparators sharing a common ground and positive supply rail. Its input stage allows common-mode voltages down to 0 V (ground) even on single supply, supporting direct sensing of signals referenced to system ground. Each output is an open-collector NPN transistor capable of sinking up to 16 mA, compatible with TTL, CMOS, and ECL logic families via external pull-up.

Internal biasing draws only 0.4 mA at 5 V and remains stable across 2.0–36 V supply range. The device exhibits 300 ns large-signal response time under 100 mV step with 5 mV overdrive, and differential input voltage tolerance up to ±36 V - permitting inputs to exceed V+ without damage when the other input stays within common-mode limits.

Key Specifications

Pinout & Package

LM393N is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with body dimensions 4.90 mm × 3.91 mm. Pin numbering follows standard SOIC convention (pin 1 at top-left corner, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393N, LM393DR offers identical performance in a production-optimized package, while TLV3702IDR trades voltage range and robustness for ultra-low power - making LM393N the optimal choice for general-purpose 2–36 V comparator tasks requiring proven reliability and wide supply flexibility.

Availability

LM393N is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial process controllers, and consumer appliance safety interlocks requiring stable component supply across extended temperature and voltage ranges.

Supply support for LM393N 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 50 years of innovation in precision analog ICs and broad industrial portfolio coverage.

The LM393N belongs to TI's legacy precision comparator family, engineered for cost-sensitive, high-reliability applications where ground-sensing, wide supply range, and logic-compatible outputs are essential - especially in power management, sensor conditioning, and discrete control systems.

FAQ

What is the maximum supply voltage for LM393N?

The LM393N supports a maximum single-supply voltage of 36 V and dual-supply operation up to ±18 V. Absolute maximum ratings allow differential input voltage up to ±36 V, but sustained operation above 36 V on V+ may cause permanent damage. For reliable long-term use, maintain V+ within 2.0 V to 36 V per the recommended operating conditions in the official LM393N datasheet.

Does LM393N require a negative supply rail?

No, LM393N does not require a negative supply rail. Its input common-mode voltage range includes ground (0 V) on single supply, allowing direct interfacing with ground-referenced sensors and signals. The GND pin serves as the reference node, and V+ supplies both comparators - eliminating need for split supplies in most applications like battery monitors or level detectors.

Can LM393N outputs be wired together?

Yes, LM393N outputs (OUTA and OUTB) are open-collector and can be safely wired together for wired-OR logic functions, such as combining multiple fault signals into a single interrupt line. Ensure a single shared pull-up resistor connects to a compatible voltage rail (≤36 V), and verify total sink current does not exceed 16 mA per output transistor under worst-case simultaneous activation.

What is the input offset voltage specification for LM393N?

The LM393N has a maximum input offset voltage of ±3 mV at 25°C, with typical values around 1.0–2.0 mV. This specification applies across the full operating temperature range (0°C to +70°C for LM393N), ensuring consistent threshold accuracy in ambient environments typical of consumer and industrial equipment without requiring calibration.

Is LM393N compatible with 3.3 V logic systems?

Yes, LM393N is compatible with 3.3 V logic systems when used with an appropriate pull-up resistor to 3.3 V. Its open-collector outputs can sink current from any voltage rail ≤36 V, and its input common-mode range (0 V to V+−1.5 V) fully covers 0–3.3 V signals at 3.3 V supply. Output saturation voltage remains ≤400 mV at 4 mA, ensuring valid LOW-level recognition by 3.3 V CMOS inputs.