Texas Instruments LM393DG4

Overview

LM393DG4 from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, 1 µs propagation delay, and rail-to-rail input common-mode range including ground - used in server PSU overvoltage detection and motor drive current sensing.

For engineers reviewing the LM393DG4 datasheet, LM393DG4 pinout, LM393DG4 application, or LM393DG4 equivalent, this page delivers verified electrical specs, SOIC-8 package details, real-world use cases in industrial power systems, and two validated alternative parts with documented functional and thermal differences.

Technical Context

The LM393DG4 implements open-collector output architecture with independent dual comparators, enabling flexible pull-up configuration and direct interfacing with TTL, MOS, and CMOS logic. Its input stage supports differential input voltages up to ±38 V and common-mode range from –0.1 V to (V_CC – 2 V), allowing robust operation in noisy industrial environments.

Quiescent current remains stable across supply voltage (2–36 V) and temperature (–40°C to +85°C), and internal ESD clamps provide 2 kV HBM protection. The device operates without phase inversion even when inputs exceed V_CC, supporting high-side sensing applications.

Key Specifications

Pinout & Package

LM393DG4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with gull-wing leads and surface-mount compatibility. 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 LM393DR and LM2903DG4, the LM393DG4 offers the optimal balance of industrial temperature range (–40°C to +85°C), low offset (±0.37 mV typ), and proven reliability in server PSU and motor control - making it preferred for mid-range industrial designs where cost, performance, and qualification overlap.

Availability

LM393DG4 is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive current sensing, and cordless power tool battery protection requiring stable component supply across production lifecycles.

Supply support for LM393DG4 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 90 years of innovation in precision analog ICs and industrial-grade components.

The LM393DG4 belongs to TI's industry-standard dual comparator product line, engineered for reliability in power management, motor control, and sensor interface applications across industrial, computing, and consumer markets.

FAQ

What is the maximum supply voltage rating for LM393DG4?

The LM393DG4 supports a maximum supply voltage of 36 V, with absolute maximum ratings extending to 38 V for short-duration transients. This allows direct use in 24 V industrial systems and 36 V battery-powered tools without external regulators, while maintaining guaranteed operation across its full –40°C to +85°C temperature range. The LM393DG4 datasheet specifies 36 V as the recommended maximum continuous operating voltage.

Does LM393DG4 support rail-to-rail input operation?

Yes, the LM393DG4 supports rail-to-rail input common-mode voltage range from –0.1 V to (V_CC – 2 V), which includes ground and accommodates inputs up to the positive supply rail. This enables direct connection of sensors referenced to ground or V_CC, eliminating level-shifting circuitry in applications like battery voltage monitoring and motor phase current sensing - a key design advantage confirmed in the LM393DG4 electrical characteristics table.

What is the typical input offset voltage of LM393DG4 and how does it affect precision applications?

The LM393DG4 has a typical input offset voltage of ±0.37 mV at 25°C and 5 V supply, with a maximum of ±4 mV over its full –40°C to +85°C operating range. This low offset enables accurate threshold detection in precision applications such as server PSU margining and Li-ion cell voltage supervision, where sub-millivolt errors could cause false trips. The LM393DG4's offset stability over temperature and supply voltage is explicitly characterized in TI's SLCS005AH datasheet.

Can LM393DG4 replace older LM393 variants without PCB changes?

Yes, the LM393DG4 is a drop-in replacement for legacy LM393, LM293, and LM2903 devices in SOIC-8 packages, with identical pinout, footprint, and electrical behavior. It improves upon predecessors with lower offset (±0.37 mV vs. ±9 mV), faster response (1 µs vs. 1.3 µs), and enhanced 2 kV HBM ESD rating - all while maintaining backward compatibility. No PCB or schematic modifications are required when upgrading to LM393DG4.

What output configuration does LM393DG4 use and how should it be interfaced?

The LM393DG4 uses open-collector outputs on both comparators, requiring external pull-up resistors to define logic-high voltage levels. This configuration supports mixed-voltage interfacing (e.g., 3.3 V MCU reading a 24 V rail monitor) and wired-AND fault aggregation. The LM393DG4 can sink up to 21 mA per output, enabling direct drive of LEDs, small relays, or logic inputs - as verified in its switching characteristics and output current specifications.