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

STMicroelectronics LM2903D

Name: LM2903D
Brand: STMicroelectronics
SKU: LM2903D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2903D

Manufacturer:: STMicroelectronics

Category:: Comparators

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

Datasheet:: LM2903D.pdf

Description:: IC COMPARATOR 2 GEN PUR 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,514

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Product details

Overview

LM2903D from STMicroelectronics is a low-power dual voltage comparator IC designed for single-supply operation from +2 V to +36 V or dual supplies ±1 V to ±18 V, featuring 0.4 mA supply current per comparator, 25 nA typical input bias current, and rail-to-rail input common-mode range including the negative rail. It drives TTL, DTL, ECL, MOS, and CMOS loads and is widely used in overvoltage detection, zero-crossing sensing, and level-shifting circuits.

For engineers reviewing the LM2903D datasheet, LM2903D pinout, LM2903D application, or LM2903D equivalent, key selection criteria include input offset voltage (1–15 mV), output sink current (6–16 mA), response time (1.3 µs small-signal), and SO8 package compatibility with industrial and automotive temperature ranges (−40 °C to +125 °C).

Technical Context

The LM2903D integrates two independent comparators with PNP input stages enabling input voltages down to the negative rail, even under single-supply operation. Its open-collector outputs support wired-OR logic and level translation across voltage domains.

It delivers stable performance across wide supply ranges (2–36 V) with supply current independent of V_CC, and differential input voltage tolerance up to ±36 V - exceeding supply rails - enabling robust interfacing with transducers and sensors operating outside nominal supply bounds.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+2 V to +36 V (single) or ±1 V to ±18 V (dual): supports battery-powered and industrial 24 V systems without level-shifting.
Supply Current	0.4 mA per comparator at 5 V: enables ultra-low-power monitoring in always-on subsystems.
Input Bias Current	25 nA typ.: minimizes loading on high-impedance sensor sources like thermistors or photodiodes.
Input Offset Voltage	1–15 mV: ensures reliable threshold detection in precision window comparators and reference monitoring.
Output Sink Current	6–16 mA: directly drives LEDs, relays, or logic inputs without external buffers.
Response Time	1.3 µs (small-signal, 100 mV step): suitable for medium-speed signal conditioning in motor control feedback loops.
Common-Mode Input Range	Includes negative rail (0 V to V_CC − 1.5 V): allows ground-referenced input sensing in single-supply applications.

Pinout & Package

LM2903D is supplied in an SO8 (plastic micropackage) with standard 1.27 mm pitch, 5.0 mm × 4.0 mm body, and exposed pad optional for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT1)	Comparator 1 output	Open-collector NPN output requiring external pull-up; sinks up to 16 mA.
2 (IN1−)	Comparator 1 inverting input	Differential input node referenced to internal PNP stage; accepts voltages down to −0.3 V.
3 (IN1+)	Comparator 1 non-inverting input	Differential input node with same rail-to-rail common-mode capability as IN1−.
4 (VCC−)	Negative supply / GND	Reference return for both comparators; tied to system ground in single-supply configurations.
5 (IN2+)	Comparator 2 non-inverting input	Independent input with identical electrical characteristics to IN1+.
6 (IN2−)	Comparator 2 inverting input	Independent input with identical electrical characteristics to IN1−.
7 (OUT2)	Comparator 2 output	Open-collector output functionally identical to OUT1; supports wired-OR with OUT1.
8 (VCC+)	Positive supply	Primary power rail; supports up to +36 V; supplies both comparators simultaneously.

Key Features

Feature	Design Value
Rail-to-rail input common-mode range	Includes negative rail (0 V) under single supply: eliminates need for negative biasing in ground-referenced sensor interfaces.
Low quiescent current	0.4 mA per comparator at 5 V: reduces standby power in battery-operated fault monitors and wake-up circuits.
TTL/CMOS-compatible output	Open-collector structure with 16 mA sink capability: enables direct interface to legacy logic families and microcontroller GPIOs.
Wide supply voltage flexibility	+2 V to +36 V single supply: supports designs spanning coin-cell sensors to 24 V industrial PLC I/O modules.
High differential input voltage tolerance	±36 V: permits safe connection to unregulated transducer outputs or noisy bus lines without clamping diodes.

Applications

Overvoltage Protection Circuit

Zero-Crossing Detector

Use Scenario: Monitoring DC bus voltage in a solar charge controller to disable charging when battery exceeds 14.8 V.

IC Role / Device Role / Timing Role: Dual comparator configured as window detector with hysteresis; one channel compares against upper threshold, the other against lower threshold.

Use Value: Enables precise, low-power shutdown without external op-amps or voltage references - leveraging built-in rail-to-rail input and open-collector outputs for direct MOSFET gate control.

Use Scenario: Detecting AC line zero crossings in a dimmer module using a resistive divider from 120 VAC.

IC Role / Device Role / Timing Role: Single comparator comparing scaled AC waveform to ground reference; output toggles at each polarity transition.

Use Value: Achieves sub-microsecond timing accuracy (1.3 µs response) with no external biasing - input common-mode range includes 0 V, eliminating need for artificial DC offset.

Level Translator for Mixed-Voltage Systems

Thermal Trip Monitor

Use Scenario: Converting 3.3 V logic signals to drive a 12 V relay coil in an IoT gateway.

IC Role / Device Role / Timing Role: Comparator acting as voltage-level shifter: 3.3 V input applied to IN+, 2.5 V reference to IN−, open-collector OUT pulled to 12 V.

Use Value: Eliminates discrete transistor stage; 16 mA sink current directly energizes relay coil while maintaining logic compatibility across voltage domains.

Use Scenario: Shutting down a motor driver when heatsink temperature exceeds 85 °C, using an NTC thermistor in a voltage divider.

IC Role / Device Role / Timing Role: Comparator comparing thermistor-derived voltage to fixed reference; output triggers latch circuit upon overtemperature event.

Use Value: 25 nA input bias current prevents measurement error in high-resistance NTC networks; low 0.4 mA supply current extends battery life in portable thermal safety modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM393DR	Higher input offset voltage (2–9 mV min/max), identical SO8 package and open-collector output, but rated only to +85 °C ambient.	Not qualified for automotive or extended industrial use above 85 °C; lacks AEC-Q100 qualification.	Select when cost sensitivity outweighs temperature range requirements and offset voltage margin is acceptable.
LM2903WDT	Same core architecture with enhanced HBM ESD rating (2 kV vs. 800 V) and CDM rating (2 kV vs. 1.5 kV); otherwise identical electrical specs and pinout.	Preferred for automotive PCBs exposed to handling ESD or automated assembly environments with high static potential.	Select when board-level ESD robustness is critical and AEC-Q100 compliance is required.

Compared with LM393DR, LM2903D offers extended temperature range (−40 °C to +125 °C) and tighter offset voltage distribution, making it suitable for under-hood automotive and industrial control. Compared with LM2903WDT, it trades higher ESD immunity for lower unit cost while retaining full functional equivalence in non-ESD-critical applications.

Availability

LM2903D is available at Aetrix Electronics and suitable for overvoltage protection circuits, zero-crossing detection systems, and level translation interfaces requiring stable component supply across automotive, industrial automation, and power management designs.

Supply support for LM2903D 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.

The LM2903 product line targets cost-sensitive, high-reliability analog signal conditioning in harsh environments - optimized for wide supply range, rail-to-rail input, and robust output drive in space-constrained SO8 packaging.

FAQ

Can LM2903D operate from a single 3.3 V supply?

Yes. The LM2903D supports single-supply operation from +2 V to +36 V. At 3.3 V, it maintains full functionality: input common-mode range extends from 0 V to 1.8 V, output saturation voltage remains ≤400 mV at 4 mA sink, and supply current stays near 0.4 mA - making it suitable for low-voltage IoT sensor nodes.

Does LM2903D require external pull-up resistors on its outputs?

Yes. Both outputs are open-collector NPN structures and must be pulled up to a valid logic-high voltage (e.g., V_CC or another rail) via external resistors. Typical values range from 1 kΩ (for fast switching with 16 mA load) to 100 kΩ (for ultra-low-power wake-up detection), depending on speed and current requirements.

What is the maximum differential input voltage the LM2903D can withstand?

The absolute maximum differential input voltage is ±36 V, independent of supply voltage. This allows direct connection to transducers or bus lines where one input may swing significantly above or below the other - for example, in isolated current-sense amplifier outputs or transformer-coupled signals - without damage or phase reversal.

Is LM2903D pin-compatible with LM393?

Yes. LM2903D and LM393 share identical SO8 pinout (OUT1, IN1−, IN1+, GND, IN2+, IN2−, OUT2, V_CC) and open-collector output architecture. However, LM2903D offers extended temperature range (−40 °C to +125 °C vs. −40 °C to +85 °C) and lower input bias current (25 nA vs. 250 nA), enabling drop-in replacement in upgraded thermal or precision designs.

LM2903D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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

Series:: -

Packaging:: Tube

Product Status:: Active

Type:: General Purpose

Number of Elements:: 2

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

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

:: 7mV @ 5V

Voltage - Input Offset (Max):: 0.25µA @ 5V

Current - Input Bias (Max):: 16mA @ 5V

Current - Output (Typ):: 2.5mA

Current - Quiescent (Max):: -

CMRR, PSRR (Typ):: -

Propagation Delay (Max):: -

Hysteresis:: -40°C ~ 125°C

Operating Temperature:: -

Grade:: -

Qualification:: Surface Mount

:: 8-SOIC

LM2903D FAQ

1.How can I place an order for LM2903D through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2903D 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 LM2903D reliable?

The price and inventory of LM2903D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903D is usually 5 days.

3.What payment methods are accepted for LM2903D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2903D?

LM2903D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2903D 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 LM2903D?

For technical support, including LM2903D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903D requirements.

6.How does Aetrix verify that LM2903D is sourced from the original manufacturer or authorized distributors?

All LM2903D 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 LM2903D meets industry standards.

7.What is the process for return or replacement of LM2903D?

All LM2903D units undergo pre-shipment inspection (PSI). If there is an issue with LM2903D, 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 LM2903D part is unused and in its original packaging.

Return procedure for LM2903D:

1.Submit a request within 90 days.

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

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