Texas Instruments LM393DRE4

Overview

LM393DRE4 from Texas Instruments is a dual precision voltage comparator in SOIC-8 package, designed for single-supply operation from 2 V to 36 V. It delivers ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, 1 µs propagation delay, rail-to-rail input common-mode range including ground, and open-collector TTL/MOS/CMOS-compatible outputs - widely used in power supply monitoring and motor control feedback loops.

For engineers reviewing the LM393DRE4 datasheet, LM393DRE4 pinout, LM393DRE4 application, or LM393DRE4 equivalent, this page provides verified electrical specifications, validated pin functions, real-world use cases in server PSUs and cordless tools, and two confirmed alternative parts with documented functional and thermal differences.

Technical Context

The LM393DRE4 implements two independent comparators with internal ESD clamps (2 kV HBM), enabling robust operation in noisy industrial environments. Its input stage supports differential voltages up to ±38 V and common-mode inputs down to –0.1 V (below ground), while maintaining low bias current (3.5 nA typ) and high large-signal gain (50–200 V/mV).

Output stage uses open-collector NPN transistors capable of sinking 21 mA at 5 V supply, with low saturation voltage (110 mV typ at 4 mA). Quiescent current remains stable across supply voltage (400–600 µA at 5 V) and temperature (–40°C to +85°C), supporting wide-input-range sensing without external level-shifting.

Key Specifications

Pinout & Package

LM393DRE4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with gull-wing leads and standard JEDEC MS-012AC footprint. Thermal performance is characterized by R_θJA = 148.5°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DRE4, LM393DR trades precision and speed for lower cost in non-critical applications, while LM2903DT offers identical electrical performance in a smaller, thermally optimized package for demanding environments - neither is pin-compatible without layout revision due to differing footprints.

Availability

LM393DRE4 is available at Aetrix Electronics and suitable for server PSU monitoring, cordless tool battery management, and building automation occupancy detection requiring stable component supply across industrial temperature ranges and multi-year production cycles.

Supply support for LM393DRE4 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 over 90 years of innovation in precision analog ICs and power management solutions.

The LM393x family was developed to provide industry-standard dual comparators with enhanced ESD robustness, wider supply range, and lower offset for industrial and consumer power systems - LM393DRE4 represents the B-version iteration optimized for reliability and precision.

FAQ

What is the maximum supply voltage rating for LM393DRE4?

The LM393DRE4 supports a maximum supply voltage of 36 V, with absolute maximum rating up to 38 V. This exceeds legacy LM393 variants (30 V max) and enables direct integration into 24 V industrial control systems and 36 V battery-powered equipment without external regulators or voltage dividers.

Does LM393DRE4 require dual power supplies?

No, LM393DRE4 operates from a single supply ranging from 2 V to 36 V. Its input common-mode range includes ground and extends to VCC – 2 V, and its open-collector outputs interface cleanly with any logic family via external pull-up resistors - eliminating need for negative rails or level shifters.

What is the input offset voltage specification for LM393DRE4 over temperature?

LM393DRE4 guarantees ±4 mV maximum input offset voltage across its full operating temperature range of –40°C to +85°C. At 25°C, typical offset is ±0.37 mV, making it suitable for precision threshold detection where drift must remain below 10 mV in ambient-varying environments.

Can LM393DRE4 drive a relay coil directly?

Yes - LM393DRE4's open-collector output can sink up to 21 mA at 5 V supply, sufficient to drive small signal relays (e.g., 5 V, 100 Ω coil). For higher-current relays, add a discrete NPN transistor buffer; always include a flyback diode across the coil to protect the output transistor.

Is LM393DRE4 pin-compatible with older LM393 variants?

LM393DRE4 uses the standard SOIC-8 pinout shared by all LM393x family members, including LM393DR and LM2903. However, while functionally compatible, its B-version enhancements (lower offset, faster response, higher supply rating) may affect timing or accuracy in legacy designs originally tuned for ±9 mV offset or 1.3 µs delay.