STMicroelectronics LM393AWDT

Overview

LM393AWDT from STMicroelectronics is a dual low-voltage comparator IC with rail-to-rail input common-mode range including ground, ±1 mV typical input offset voltage, 0.45 mA supply current at 5 V, and TTL/CMOS-compatible open-collector outputs. It operates from single supplies (2–36 V) or split supplies (±1 V to ±18 V), enabling use in battery-powered sensor interfaces and industrial level-detection circuits.

For engineers reviewing the LM393AWDT datasheet, LM393AWDT pinout, LM393AWDT application, or LM393AWDT equivalent, this device is selected for precision threshold detection where input grounding capability, low quiescent power, and wide supply flexibility are required - especially in zero-crossing detectors, limit comparators, and transducer signal conditioning.

Technical Context

The LM393AWDT integrates two independent PNP-input comparators with differential input voltage range equal to the full supply rail (±36 V), allowing inputs to swing beyond VCC− and up to VCC+ without phase reversal. Its input bias current of 20 nA typ. and offset current of ±3 nA typ. minimize reference loading in high-impedance sensing nodes.

Output stage uses open-collector NPN transistors capable of sinking 6–18 mA, with 80 mV typical saturation voltage at 4 mA sink load. The device supports direct interfacing to TTL, DTL, ECL, MOS, and CMOS logic families without pull-up resistors on the output side when used with external pull-ups.

Key Specifications

Pinout & Package

LM393AWDT is packaged in SO8 (Small Outline Integrated Circuit, 150 mil width), with 8-pin surface-mount footprint and standard JEDEC MS-012AC outline. Pin 1 is marked by notch or dot; exposed pad is not present in SO8 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DT, LM393AWDT adds verified 2 kV HBM ESD hardening without trade-offs in speed or offset; versus TLV3702IDR, it retains critical ground-sensing capability essential for legacy sensor interfaces, albeit at higher quiescent current.

Availability

LM393AWDT is available at Aetrix Electronics and suitable for industrial sensor interfaces, power supply supervision, and motor control feedback requiring stable component supply across automotive-grade temperature ranges and long-lifecycle programs.

Supply support for LM393AWDT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

LM393AWDT belongs to ST's legacy precision analog comparator family, engineered for reliability in cost-sensitive industrial controls and sensor signal conditioning where ground-referenced operation and wide supply tolerance are mandatory.

FAQ

Can LM393AWDT operate from a 3.3 V supply?

Yes - LM393AWDT supports single-supply operation from 2 V to 36 V, including 3.3 V logic rails. At 3.3 V, its input common-mode range extends from 0 V to 1.8 V (VCC+ − 1.5 V), and output sink current remains functional with appropriate pull-up selection. Input offset voltage stays within ±2 mV over temperature.

Is LM393AWDT pin-compatible with LM393DT?

Yes - LM393AWDT shares identical SO8 pinout, electrical characteristics, and functional behavior with LM393DT. The "W" suffix denotes enhanced 2 kV HBM ESD protection on all pins, with no changes to pin assignment, timing, or DC parameters. It is a direct drop-in replacement for improved robustness.

Does LM393AWDT require external pull-up resistors on its outputs?

Yes - both outputs are open-collector NPN transistors and must be pulled up externally to a logic-compatible voltage (e.g., 3.3 V or 5 V). Typical values range from 1 kΩ to 10 kΩ depending on rise time and fan-out requirements. No internal pull-ups are integrated.

What is the maximum sink current capability of LM393AWDT outputs?

Each output can sink ≥6 mA continuously while maintaining VOL ≤ 400 mV (max) at Tamb = 25°C, and ≥4 mA under worst-case conditions (Tmin to Tmax). Absolute maximum sink current is ~20 mA, but sustained operation above 6 mA may cause thermal derating in SO8 package due to RθJA = 125 °C/W.