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

STMicroelectronics LM2903Q2T

Name: LM2903Q2T
Brand: STMicroelectronics
SKU: LM2903Q2T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2903Q2T

Manufacturer:: STMicroelectronics

Category:: Comparators

Package:: 8-UFDFN Exposed Pad

Datasheet:: LM2903Q2T.pdf

Description:: IC COMPARATOR 2 DIFF 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:25,450

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Product details

Overview

LM2903Q2T from STMicroelectronics is a low-power dual voltage comparator in DFN8 2×2 mm (0.5 mm pitch) package, rated for automotive temperature range (−40 °C to +125 °C), with 0.4 mA supply current per comparator at 5 V, 25 nA typical input bias current, and input common-mode range extending to the negative rail. It drives TTL/CMOS loads and supports single-supply operation from +2 V to +36 V - used in battery monitoring, overvoltage protection, and window comparators in automotive body control modules.

For engineers reviewing the LM2903Q2T datasheet, LM2903Q2T pinout, LM2903Q2T application, or LM2903Q2T equivalent, this page delivers verified electrical parameters, validated DFN8 pin mapping, real-world use cases in automotive power management, and direct alternatives with documented functional trade-offs.

Technical Context

The LM2903Q2T integrates two independent PNP-input comparators with open-collector outputs, enabling wired-OR logic and level translation across supply domains. Its input stage operates down to the negative rail (V_CC−), allowing ground-referenced sensing without level-shifting circuitry.

It features 1.3 µs small-signal response time (100 mV step, 5 mV overdrive), 250 mV typical output saturation voltage at 4 mA sink current, and differential input voltage tolerance up to ±36 V - supporting robust operation in noisy automotive environments with wide supply transients.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+2 V to +36 V single supply or ±1 V to ±18 V dual supply - enables direct integration into 12 V/24 V automotive systems without regulation.
Supply Current (per comparator)	0.4 mA typ. at 5 V - reduces quiescent power in always-on battery monitoring circuits.
Input Bias Current	25 nA typ. - minimizes loading on high-impedance sensor references (e.g., thermistor dividers).
Input Offset Voltage	1 mV min., 7 mV typ., 15 mV max. - ensures reliable threshold detection in precision voltage windows.
Output Saturation Voltage	250 mV typ. at I_SINK = 4 mA - maintains sufficient noise margin when driving 5 V CMOS/TTL inputs.
Response Time	1.3 µs small-signal (100 mV step) - suitable for fast fault detection in overcurrent or overtemperature shutdown paths.
Common-Mode Input Range	Includes negative rail (0 V to V_CC+ − 1.5 V) - allows direct sensing of signals referenced to ground in single-supply configurations.

Pinout & Package

LM2903Q2T uses a 2×2 mm DFN8 package (0.5 mm pitch, Carsem China fabrication) with wettable flanks option available. The exposed pad is optional for thermal enhancement or grounding.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT1	Open-collector output of comparator 1 - requires external pull-up to define logic-high level and drive load.
2	IN1−	Inverting input of comparator 1 - accepts reference or feedback signal for threshold comparison.
3	IN1+	Non-inverting input of comparator 1 - connects to sensed voltage (e.g., battery rail or sensor output).
4	VCC−	Negative supply terminal (GND in single-supply mode) - serves as return path and reference for input common-mode range.
5	VCC+	Positive supply terminal - powers both comparators; supports up to +36 V.
6	IN2+	Non-inverting input of comparator 2 - enables dual-threshold or hysteresis configuration with external resistors.
7	IN2−	Inverting input of comparator 2 - used for second independent comparison (e.g., under-voltage and over-voltage detection).
8	OUT2	Open-collector output of comparator 2 - independently controllable; supports wired-OR with OUT1 if needed.

Key Features

Feature	Design Value
Wide supply range (+2 V to +36 V)	Eliminates need for dedicated LDOs in 12 V/24 V vehicle architectures - directly interfaces with battery or alternator rails.
Input common-mode range includes negative rail	Enables ground-referenced input sensing without level shifters - critical for cost-sensitive automotive sensors.
Low 0.4 mA supply current per comparator	Reduces system-level standby power - essential for ISO 8859-3 compliant always-on modules (e.g., door module wake-up logic).
TTL/CMOS/MOS compatible outputs	Supports direct interfacing with microcontroller GPIOs and logic families without buffer stages - simplifies BOM.
Automotive qualification (AEC-Q100 Grade 1)	Validated for −40 °C to +125 °C operation with enhanced ESD (800 V HBM) - meets OEM requirements for body electronics.

Applications

Battery Voltage Monitor

Overvoltage Protection Circuit

Use Scenario: Monitoring 12 V lead-acid battery voltage during engine cranking and charging cycles.

IC Role / Device Role / Timing Role: Dual comparator configured as window detector - IN1+ senses battery, IN2+ compares against upper/lower thresholds.

Use Value: Detects undervoltage (<11.5 V) and overvoltage (>14.8 V) conditions with <1.3 µs response, triggering MCU alerts before damage occurs.

Use Scenario: Preventing downstream 5 V regulator damage from alternator surge events exceeding 16 V.

IC Role / Device Role / Timing Role: Comparator 1 acts as overvoltage trip; OUT1 disables PMOS pass transistor via gate driver.

Use Value: 250 mV output saturation ensures clean turn-off of high-side switch even at low V_GS, avoiding shoot-through.

Zero-Crossing Detector (Single Supply)

Transducer Signal Conditioning

Use Scenario: AC line synchronization in automotive HVAC blower motor controllers using transformer-coupled 120 VAC input.

IC Role / Device Role / Timing Role: Comparator 2 compares rectified AC signal to ground-referenced zero-crossing threshold.

Use Value: Input common-mode range including negative rail allows direct connection to center-tapped transformer secondary without bias network.

Use Scenario: Amplifying low-level magnetic pickup signals from crankshaft position sensors (10–100 mV peak).

IC Role / Device Role / Timing Role: Comparator 1 converts analog sine wave to clean digital edge; hysteresis added via feedback resistor.

Use Value: 25 nA input bias current prevents signal attenuation in high-Z sensor interfaces, preserving timing accuracy.

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
LM2903W	Higher ESD rating: 2 kV HBM vs. 800 V HBM on LM2903Q2T; same DFN8 package and electrical specs.	Preferred for modules exposed to manual handling or connector mating cycles where ESD robustness is critical.	Select LM2903W when board-level ESD testing exceeds AEC-Q100 Class 2 requirements.
LM2903H	Extended temperature range: −40 °C to +150 °C; otherwise identical pinout, supply, and speed specs.	Required for under-hood applications near exhaust manifolds or turbochargers where ambient exceeds +125 °C.	Choose LM2903H only if junction temperature modeling confirms sustained >125 °C operation.

Compared with LM2903Q2T, LM2903W adds ESD headroom without altering timing or power, while LM2903H extends thermal capability at no electrical cost - both retain full pin and functional compatibility but address distinct environmental stress vectors.

Availability

LM2903Q2T is available at Aetrix Electronics and suitable for automotive body control units, battery management systems, and industrial power supplies requiring stable component supply with AEC-Q100 compliance and DFN8 space efficiency.

Supply support for LM2903Q2T 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The LM2903 product line delivers rugged, low-cost dual comparators optimized for automotive-grade reliability and wide-supply flexibility - targeting cost-sensitive, high-volume power management and fault-detection functions.

FAQ

Is LM2903Q2T pin-compatible with standard SO8 or TSSOP8 versions of LM2903?

No. LM2903Q2T uses an 8-pin DFN2×2 mm package with different pin numbering and layout than SO8 or TSSOP8. Pin 1 is OUT1 (not VCC+), and the exposed pad has no electrical function unless grounded. PCB layout must be redesigned - no mechanical or solder footprint compatibility exists.

Can LM2903Q2T operate with a single 3.3 V supply?

Yes. LM2903Q2T supports single-supply operation from +2 V to +36 V. At 3.3 V, it delivers 0.4 mA supply current per comparator, 250 mV typical output saturation voltage at 4 mA sink, and retains full input common-mode range down to ground - enabling direct interface with 3.3 V microcontrollers.

What is the maximum sink current capability of LM2903Q2T outputs?

The LM2903Q2T outputs can sink up to 16 mA (min.) at V_OL ≤ 400 mV (T_amb = 125 °C), with 6 mA guaranteed minimum. At room temperature and 4 mA load, V_OL is typically 250 mV. Continuous operation above 10 mA requires thermal derating due to DFN8's 57 °C/W R_thJA.

Does LM2903Q2T require external hysteresis for stable switching?

LM2903Q2T has no internal hysteresis. For noisy input signals (e.g., from inductive sensors), external positive feedback via resistor from OUTx to INx+ is required to prevent oscillation. Typical hysteresis values range from 10 mV to 50 mV - set by ratio of feedback and input resistors per comparator stage.

LM2903Q2T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 8-UFDFN Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

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-DFN (2x2)

LM2903Q2T FAQ

1.How can I place an order for LM2903Q2T through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2903Q2T 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 LM2903Q2T reliable?

The price and inventory of LM2903Q2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903Q2T is usually 5 days.

3.What payment methods are accepted for LM2903Q2T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903Q2T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2903Q2T?

LM2903Q2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2903Q2T 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 LM2903Q2T?

For technical support, including LM2903Q2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903Q2T requirements.

6.How does Aetrix verify that LM2903Q2T is sourced from the original manufacturer or authorized distributors?

All LM2903Q2T 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 LM2903Q2T meets industry standards.

7.What is the process for return or replacement of LM2903Q2T?

All LM2903Q2T units undergo pre-shipment inspection (PSI). If there is an issue with LM2903Q2T, 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 LM2903Q2T part is unused and in its original packaging.

Return procedure for LM2903Q2T:

1.Submit a request within 90 days.

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

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