Texas Instruments LM393DE4

Overview

LM393DE4 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 - widely deployed in server PSU overvoltage protection circuits.

For engineers reviewing the LM393DE4 datasheet, LM393DE4 pinout, LM393DE4 application, or LM393DE4 equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, real-world use cases in power management and motor control, and two validated alternative parts with documented functional and thermal differences.

Technical Context

The LM393DE4 implements open-collector output architecture with independent dual comparators, enabling flexible pull-up configuration and direct interfacing with TTL, MOS, and CMOS logic families. Its input stage supports differential voltages up to ±38 V and common-mode inputs down to −0.1 V (below ground), critical for sensing 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 robustness. The device operates without phase inversion even when inputs exceed VCC, supporting high-side sensing applications.

Key Specifications

Pinout & Package

LM393DE4 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with body dimensions 4.90 mm × 3.91 mm and standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and LM2903DT, the LM393DE4 uniquely combines industrial temperature range (−40°C to +85°C), SOIC-8 compatibility, and ±0.37 mV typical offset - making it optimal for server PSUs and factory automation where precision and reliability coexist.

Availability

LM393DE4 is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive protection, and cordless tool battery management requiring stable component supply across multi-year production cycles.

Supply support for LM393DE4 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 50 years of innovation in precision signal conditioning and power management ICs.

The LM393DE4 belongs to TI's industry-standard dual comparator family, engineered for robust performance in power supply supervision, industrial control, and battery management systems where reliability and long-term availability are critical.

FAQ

What is the maximum supply voltage supported by the LM393DE4?

The LM393DE4 supports a maximum supply voltage of 36 V, with absolute maximum rating up to 38 V. This allows direct use in 24 V industrial systems and 36 V battery packs without external regulation, and its input stage tolerates differential voltages up to ±38 V - critical for fault-tolerant sensing in high-voltage applications. Always observe derating guidelines above 30 V for long-term reliability.

Does the LM393DE4 require dual supplies or can it operate from a single rail?

The LM393DE4 is designed exclusively for single-supply operation from 2 V to 36 V. It features rail-to-rail input common-mode range that includes ground, eliminating the need for negative supplies. This simplifies design in battery-powered and isolated systems - for example, it can compare a 0–3.3 V sensor output directly to a 1.25 V reference without level shifting or split rails.

How does the LM393DE4 handle input voltages exceeding the supply rail?

The LM393DE4 allows either or both inputs to reach up to the maximum VCC level (38 V) without damage, and its input stage remains functional even when one input exceeds VCC. However, the upper limit of the valid common-mode range is VCC − 2 V; operation beyond that may cause incorrect output states. TI confirms this behavior is safe and specified - no clamping diodes or external protection are needed.

Can the LM393DE4 outputs drive an LED directly?

Yes - each open-collector output of the LM393DE4 can sink up to 21 mA, sufficient to drive standard indicator LEDs with appropriate current-limiting resistors. For a 5 V system and red LED (VF ≈ 1.8 V), a 220 Ω resistor yields ~14.5 mA. Ensure total sink current per output stays below 21 mA and that the pull-up voltage matches the target logic family (e.g., 3.3 V for MCU GPIOs).

Is the LM393DE4 pin-compatible with older LM393 variants?

Yes - the LM393DE4 is a drop-in replacement for LM393, LM293, and LM2903 in SOIC-8 packages. Pin assignments, electrical behavior, and thermal characteristics match identically. No PCB or schematic changes are required; only verify that the extended temperature range (−40°C to +85°C) and improved specs (e.g., lower offset, faster response) align with your application's performance targets.