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Home > Products > Integrated Circuits (ICs) > Linear > Comparators

STMicroelectronics LM293ADT

Name: LM293ADT
Brand: STMicroelectronics
SKU: LM293ADT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM293ADT

Manufacturer:: STMicroelectronics

Category:: Comparators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LM293ADT.pdf

Description:: IC COMPARATOR 2 GEN PUR 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:26,202

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Product details

Overview

LM293ADT from STMicroelectronics is a dual low-voltage comparator IC designed for single-supply operation from 2 V to 36 V (or ±1 V to ±18 V), featuring ±1 mV typical input offset voltage, 20 nA typical input bias current, and 0.45 mA supply current at 5 V. It supports ground-sensing inputs and TTL/CMOS-compatible open-collector outputs, commonly used in voltage monitoring, zero-crossing detection, and level-shifting circuits in industrial control systems.

For engineers reviewing the LM293ADT datasheet, LM293ADT pinout, LM293ADT application, or LM293ADT equivalent, key selection criteria include input common-mode range including ground, low output saturation voltage (80 mV typ. at 4 mA sink), differential input voltage equal to supply rail, wide temperature range (–40°C to +105°C), and SO8 package compatibility with legacy PCB footprints.

Technical Context

The LM293ADT employs PNP-input transistor pairs enabling input common-mode voltage down to ground under single-supply operation - a critical feature for sensor interface and battery-monitoring applications where reference voltages sit near 0 V. Its open-collector outputs support wired-OR logic and level translation across mixed-voltage domains.

Internal architecture avoids internal phase compensation, delivering 1.3 μs typical response time (100 mV step, 5 mV overdrive) and large-signal voltage gain of 50–200 V/mV. Input offset voltage remains stable across temperature (±4 mV max over –40°C to +105°C), supporting reliable threshold detection in automotive and industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2 V to 36 V single supply (±1 V to ±18 V dual); enables direct use with 3.3 V, 5 V, 12 V, and 24 V rails without regulation.
Input Offset Voltage	±1 mV typ. (±4 mV max); ensures accurate threshold comparison in precision voltage monitoring and transducer signal conditioning.
Input Bias Current	20 nA typ.; minimizes loading on high-impedance sources like thermistors or photodiodes.
Supply Current	0.45 mA typ. at 5 V; supports low-power always-on sensing in battery-backed systems.
Output Saturation Voltage	80 mV typ. at 4 mA sink; reduces power loss and improves noise margin when driving logic or LED loads.
Response Time	1.3 μs typ. (100 mV step, 5 mV overdrive); suitable for medium-speed event detection (e.g., motor commutation feedback).
Common-Mode Input Range	Includes ground (0 V) up to (V_CC+ – 1.5 V); allows direct interfacing with unipolar sensors and ADC references.

Pinout & Package

LM293ADT is supplied in SO8 package (standard small-outline 8-pin plastic package, 5.0 mm × 4.0 mm body, 1.27 mm lead pitch). The exposed pad is absent - not applicable to SO8 variant.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT1	Open-collector output of Comparator 1; requires external pull-up to define logic HIGH level and voltage domain.
2	IN1−	Inverting input of Comparator 1; accepts signals up to V_CC+ − 1.5 V and down to −0.3 V.
3	IN1+	Non-inverting input of Comparator 1; same voltage range as IN1−; enables flexible reference configuration.
4	V_CC−	Negative supply terminal (GND in single-supply mode); must be connected to system ground or negative rail.
5	IN2+	Non-inverting input of Comparator 2; independent channel supports dual-threshold or window-comparator topologies.
6	IN2−	Inverting input of Comparator 2; fully decoupled from Channel 1 for simultaneous independent comparisons.
7	OUT2	Open-collector output of Comparator 2; electrically isolated from OUT1; supports separate pull-up networks.
8	V_CC+	Positive supply terminal; supplies both comparators; supports rail-to-rail differential input swing.

Key Features

Feature	Design Value
Ground-sensing input stage	PNP differential pair enables common-mode input down to 0 V - eliminates need for level-shifting in single-supply sensor interfaces.
Low quiescent power	0.45 mA supply current at 5 V (1 mW per comparator) - extends battery life in portable instrumentation and IoT edge nodes.
Wide supply flexibility	Operates from 2 V to 36 V single supply or ±1 V to ±18 V split supply - simplifies design reuse across 3.3 V microcontrollers and 24 V PLC I/O modules.
TTL/CMOS/MOS logic compatibility	Open-collector outputs interface directly with 3.3 V, 5 V, and 12 V logic families via appropriate pull-up resistors.
Robust ESD tolerance	HBM rating of 2 kV (per LM393W spec family; LM293A shares same process and layout - confirmed via ST DS0443 Rev 17 Table 1 footnote 7)

Applications

Overvoltage Protection Circuit

Zero-Crossing Detector

Use Scenario: Monitoring DC bus voltage in a 24 V industrial power supply to trigger shutdown if >26.5 V.

IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel monitors upper threshold, second monitors lower threshold.

Use Value: ±1 mV offset ensures consistent trip point across temperature; 80 mV output saturation guarantees clean logic transition into MCU GPIO interrupt pin.

Use Scenario: Converting AC line voltage (120 V RMS) to digital zero-cross pulses for TRIAC phase-angle control in lighting dimmers.

IC Role / Device Role / Timing Role: Single comparator with resistive divider and hysteresis; compares scaled AC waveform against ground-referenced threshold.

Use Value: Input common-mode range including ground allows direct AC coupling to V_CC− = GND; 1.3 μs response ensures <1° timing error at 60 Hz.

Transducer Signal Conditioning

Level-Shifting Interface

Use Scenario: Amplifying and comparing output of a 100 Ω RTD bridge (0–100 mV span) against fixed reference in HVAC temperature controller.

IC Role / Device Role / Timing Role: Comparator front-end for analog sensor; rejects common-mode noise while detecting small differential changes.

Use Value: 20 nA input bias current prevents bridge imbalance error; ±1 mV offset enables resolution better than 0.1°C in calibrated systems.

Use Scenario: Translating 1.8 V logic signals from an ultra-low-power MCU to 5 V control lines driving relays in smart home hubs.

IC Role / Device Role / Timing Role: Voltage-level translator using open-collector output pulled to 5 V; comparator acts as digital buffer with hysteresis.

Use Value: 36 V max supply allows safe 5 V pull-up; TTL/CMOS compatibility ensures rise/fall times meet relay driver setup requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM393ADT	Same architecture but rated for 0°C to +70°C ambient; ±2 mV max input offset (vs. ±4 mV for LM293ADT); identical pinout and SO8 package.	Restricted to commercial-grade environments (e.g., consumer electronics); unsuitable for under-hood or factory-floor deployments.	Select LM393ADT only when cost sensitivity outweighs extended temperature requirement and tighter offset is unnecessary.
TLV3702IDR	Rail-to-rail input/output; 360 nA supply current; 1.5 mV max offset; 1.5 V to 16 V supply; SOT-23-8 package (not pin-compatible).	Enables ultra-low-voltage operation (down to 1.5 V) and higher precision, but requires PCB redesign due to different footprint and no ground-sensing capability.	Choose TLV3702IDR only when operating below 2 V or requiring rail-to-rail input swing - not a drop-in replacement.

Compared with LM393ADT, LM293ADT offers wider temperature range and slightly better offset stability, making it preferred for industrial automation; versus TLV3702IDR, it trades ultra-low power and rail-to-rail performance for proven ground-sensing reliability and SO8 drop-in compatibility.

Availability

LM293ADT is available at Aetrix Electronics and suitable for industrial control systems, power supply supervision, sensor interface modules, and embedded safety monitoring requiring stable component supply across extended temperature ranges.

Supply support for LM293ADT 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 microcontrollers, power management ICs, sensors, and analog components for automotive, industrial, and consumer markets.

The LM293 series belongs to ST's legacy precision analog comparator product line, engineered specifically for robust, low-cost voltage comparison in harsh environments - emphasizing ground-referenced operation, wide supply tolerance, and long-term reliability over speed or rail-to-rail features.

FAQ

Can LM293ADT operate from a 3.3 V supply?

Yes. LM293ADT supports single-supply operation from 2 V to 36 V, including 3.3 V. At 3.3 V, input common-mode range extends from 0 V to 1.8 V, and output saturation remains ≤400 mV at 4 mA sink - sufficient to drive 3.3 V logic with appropriate pull-up. Verified per DS0443 Table 2 and Table 3 conditions.

Does LM293ADT require external hysteresis for noise immunity?

Yes - LM293ADT has no internal hysteresis. For noisy input signals (e.g., mechanical switch debouncing or AC-coupled sensor outputs), external positive feedback (e.g., resistor from OUT to IN+) must be added. Typical hysteresis width is set by resistor ratio and output swing; design examples are shown in Figures 16–17 of DS0443 Rev 17.

What is the maximum sink current per output of LM293ADT?

The absolute maximum output sink current is not specified as a standalone rating, but electrical characteristics show Isink = 6–18 mA (typ–max) at Vo = 1.5 V with Vid = 1 V. Continuous operation above 6 mA increases junction temperature; thermal data (R_thja = 125 °C/W for SO8) limits practical sustained sink to ≤10 mA at +105°C ambient without derating.

Is LM293ADT pin-compatible with LM393ADT?

Yes - LM293ADT and LM393ADT share identical SO8 pinout, electrical behavior, and functional block diagram. The only differences are temperature grade (–40°C to +105°C vs. 0°C to +70°C) and guaranteed input offset voltage (±4 mV max vs. ±2 mV max). Both use same marking "293A" and "393A" respectively on package top.

LM293ADT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: General Purpose

Number of Elements:: 2

Output Type:: Open-Collector, Open-Drain, Rail-to-Rail

Voltage - Supply, Single/Dual (±):: 2V ~ 36V, ±1V ~ 18V

:: 2mV @ 30V

Voltage - Input Offset (Max):: 0.1µA @ 5V

Current - Input Bias (Max):: 18mA @ 5V

Current - Output (Typ):: 2.5mA

Current - Quiescent (Max):: -

CMRR, PSRR (Typ):: -

Propagation Delay (Max):: -

Hysteresis:: -40°C ~ 105°C

Operating Temperature:: -

Grade:: -

Qualification:: Surface Mount

:: 8-SOIC

LM293ADT FAQ

1.How can I place an order for LM293ADT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM293ADT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM293ADT reliable?

The price and inventory of LM293ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293ADT is usually 5 days.

3.What payment methods are accepted for LM293ADT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293ADT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM293ADT?

LM293ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM293ADT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM293ADT?

For technical support, including LM293ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293ADT requirements.

6.How does Aetrix verify that LM293ADT is sourced from the original manufacturer or authorized distributors?

All LM293ADT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM293ADT meets industry standards.

7.What is the process for return or replacement of LM293ADT?

All LM293ADT units undergo pre-shipment inspection (PSI). If there is an issue with LM293ADT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM293ADT part is unused and in its original packaging.

Return procedure for LM293ADT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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