STMicroelectronics LM393AN

Overview

LM393AN from STMicroelectronics is a dual low-power voltage comparator IC operating from single supply (2V–36V) or split supplies (±1V–±18V), featuring rail-to-rail input common-mode range including ground, ±1mV typical input offset voltage, 25nA typical input bias current, and open-collector TTL/CMOS-compatible outputs. It is widely used in level detection, zero-crossing circuits, and transducer signal conditioning in industrial control and power management systems.

For engineers reviewing the LM393AN datasheet, LM393AN pinout, LM393AN application, or LM393AN equivalent, key selection criteria include input offset voltage stability over temperature, output sink capability (6mA min), supply current independence from V_CC, and compatibility with legacy DIP-8 PCB footprints in cost-sensitive analog monitoring designs.

Technical Context

The LM393AN implements two independent PNP-input comparators with differential input voltage range equal to the full supply rail (±36V max), enabling robust operation under mismatched input conditions. Its input stage allows common-mode voltages down to ground on single supply-critical for sensor interfaces referenced to system GND.

Output stage uses open-collector NPN transistors capable of sinking ≥6mA at 250mV saturation voltage (I_O = 4mA), supporting direct interfacing to TTL, CMOS, ECL, and MOS logic families without pull-up resistors beyond system requirements.

Key Specifications

Pinout & Package

DIP-8 plastic package (0.3-inch width), through-hole mount, JEDEC MS-001 compliant. Pin 1–8 arranged in standard dual-in-line configuration with notch orientation marking Pin 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR, the LM393AN offers identical analog performance in a legacy-compatible through-hole package ideal for prototyping and low-volume industrial controls; versus TLV3702IP, it trades higher quiescent current for tighter offset voltage and proven reliability in high-noise 24VDC environments.

Availability

LM393AN is available at Aetrix Electronics and suitable for overvoltage protection, zero-crossing detection, transducer signal conditioning, and threshold-based alarm systems requiring stable component supply across extended temperature ranges (0°C to +70°C).

Supply support for LM393AN 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, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The LM393 series belongs to ST's legacy precision analog portfolio, engineered specifically for cost-sensitive, high-reliability dual-comparator applications where ground-sensing capability, low power, and broad supply range are essential design constraints.

FAQ

Can LM393AN operate with a single 3.3V supply?

Yes. The LM393AN supports single-supply operation from +2V to +36V, making 3.3V fully compliant. Its input common-mode range includes ground, and output can sink current to define LOW state while an external pull-up sets HIGH level-ideal for interfacing with 3.3V logic families.

What is the maximum sink current capability of LM393AN outputs?

The LM393AN outputs are rated for minimum 6mA sink current at V_OL ≤ 700mV (full temperature range). At room temperature and 4mA load, saturation voltage is typically 250mV. This ensures robust drive into TTL inputs and LED indicators without additional buffering.

Does LM393AN require external hysteresis for noise immunity?

Yes-LM393AN has no internal hysteresis. For noisy input signals (e.g., slow-rising transducer outputs), external positive feedback via resistor networks between output and non-inverting input is required to prevent multiple transitions near threshold. Typical values range from 100kΩ to 1MΩ depending on input impedance.

Is LM393AN pin-compatible with other LM393 variants like LM393DR or LM393DT?

Yes-LM393AN (DIP-8), LM393DR (SO-8), and LM393DT (TSSOP-8) share identical pin functions and electrical specifications. Only package type and thermal characteristics differ; PCB layout must match respective footprint, but schematic design remains unchanged across variants.