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STMicroelectronics LM2903ST
- Part No.:
- LM2903ST
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2903ST.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8MINISO
- Quantity:
- Payment:
- Shipping:
Inventory:43,830
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Product details
Overview
LM2903ST from STMicroelectronics is a low-power dual voltage comparator in MiniSO8 package, operating from single supply (2–36 V) or split supplies (±1 V to ±18 V), with input common-mode range extending to the negative rail, 25 nA typical input bias current, and 250 mV typical output saturation voltage at 4 mA - used in automotive window lift control, battery voltage monitoring, and industrial limit detection circuits.
For engineers reviewing the LM2903ST datasheet, LM2903ST pinout, LM2903ST application, or LM2903ST equivalent, key selection considerations include rail-to-rail input capability under single-supply operation, TTL/CMOS-compatible open-collector outputs, temperature range (-40 °C to +125 °C), and AEC-Q100 qualification for automotive-grade variants.
Technical Context
The LM2903ST integrates two independent comparators with PNP input stages enabling input voltages down to the negative rail, even when powered from a single supply. Its differential input voltage range equals the full supply voltage (±36 V), and it features internal 3.5 µA bias current sources per comparator.
Output stage uses open-collector NPN transistors capable of sinking up to 16 mA, with low saturation voltage (250 mV typ. at 4 mA), supporting direct interfacing to TTL, DTL, ECL, MOS, and CMOS logic families without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2 V to +36 V (single) or ±1 V to ±18 V (dual) - enables direct use in 12 V/24 V automotive and industrial systems without regulation. |
| Input Bias Current | 25 nA typ. - minimizes loading on high-impedance sensor references like thermistors or potentiometers. |
| Input Offset Voltage | 1–15 mV - supports accurate threshold detection in precision level-sensing applications. |
| Output Sink Current | 6–16 mA - drives LEDs, relays, or logic inputs directly without external buffer stages. |
| Response Time | 500 ns (large-signal), 1.3 µs (small-signal) - suitable for medium-speed zero-crossing and pulse-width detection. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive and industrial control environments. |
| ESD Rating (HBM) | 800 V - meets baseline robustness requirements for assembly and field operation. |
Pinout & Package
LM2903ST is supplied in MiniSO8 package: 3.0 mm × 4.9 mm body, 0.65 mm pitch, 0.8 mm max height, RoHS-compliant, ECOPACK2 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector NPN - requires external pull-up to define high-level voltage and logic family compatibility. |
| 2 (IN1−) | Comparator 1 inverting input | Differential input node referenced to internal PNP stage - accepts voltages down to VCC− (GND). |
| 3 (IN1+) | Comparator 1 non-inverting input | Differential input node - used for threshold comparison against IN1− or reference signal. |
| 4 (VCC−) | Negative supply / ground | Reference return path for both comparators and input common-mode range anchor. |
| 5 (VCC+) | Positive supply | Primary power rail - supports wide-range operation from 2 V to 36 V. |
| 6 (IN2+) | Comparator 2 non-inverting input | Independent threshold input - enables dual-channel sensing (e.g., upper/lower limits). |
| 7 (IN2−) | Comparator 2 inverting input | Second differential input - configurable as reference or signal path per application. |
| 8 (OUT2) | Comparator 2 output | Open-collector output - electrically isolated from OUT1, allowing independent load control. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes negative rail (VCC−) - eliminates need for level-shifting in single-supply sensor interfaces. |
| Low quiescent current | 0.4 mA total (200 µA/comparator at 5 V) - extends battery life in portable and always-on monitoring systems. |
| Wide supply voltage flexibility | Operates from 2 V to 36 V single supply - compatible with 3.3 V microcontrollers and 24 V industrial PLCs. |
| Automotive-grade option available | LM2903YST variant qualified to AEC-Q100 Grade 1 - supports deployment in ADAS and body electronics. |
| Logic-family compatibility | TTL/DTL/ECL/MOS/CMOS output interface - simplifies integration with legacy and modern digital subsystems. |
Applications
| Automotive Window Lift Control | Battery Voltage Monitor |
|---|---|
|
Use Scenario: Detect motor stall or obstruction by comparing current-sense voltage against dual thresholds during window ascent/descent. IC Role / Device Role / Timing Role: Dual comparator implements hysteresis-based overcurrent and undervoltage lockout with independent response paths. Use Value: Prevents glass breakage and motor burnout using only one IC, reducing BOM count and PCB area vs. discrete solutions. |
Use Scenario: Monitor 12 V lead-acid battery voltage to trigger low-battery warning or system shutdown before deep discharge. IC Role / Device Role / Timing Role: Compares sensed battery voltage against fixed upper/lower thresholds (e.g., 12.8 V / 11.5 V) with hysteresis. Use Value: Enables reliable state-of-charge estimation without microcontroller ADC overhead or calibration drift. |
| Industrial Limit Switch Interface | Zero-Crossing Detector (Single Supply) |
|
Use Scenario: Convert mechanical limit switch closure into clean digital signal for PLC input, rejecting contact bounce and noise. IC Role / Device Role / Timing Role: Comparator acts as Schmitt-trigger front-end with adjustable hysteresis via feedback resistor network. Use Value: Eliminates need for external RC debounce circuits and reduces false triggers in electrically noisy factory environments. |
Use Scenario: Detect AC line zero crossings in single-supply SMPS or dimmer control using resistive divider and clamping diodes. IC Role / Device Role / Timing Role: Compares scaled AC waveform against GND reference; output toggles at each polarity transition. Use Value: Achieves <500 ns timing resolution without transformer isolation or dual-supply op-amps, lowering system cost and size. |
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 |
|---|---|---|---|
| LM2903PT | TSSOP8 package (3.0 × 4.4 mm), same electrical specs, slightly higher RthJA (120 °C/W vs. 190 °C/W for MiniSO8) | Better thermal performance in high-density layouts; preferred for reflow-sensitive assemblies. | Select when board space allows TSSOP footprint and thermal management prioritizes junction-to-ambient conduction. |
| LM2903YDT | SO8 package, AEC-Q100 qualified, identical electrical behavior, larger footprint (4.9 × 6.0 mm) | Higher mechanical robustness and legacy compatibility; used where through-hole or SOIC hand-soldering is required. | Choose for automotive production requiring proven SO8 reliability and standard test socket support. |
Compared with LM2903ST, LM2903PT offers superior thermal dissipation in compact layouts, while LM2903YDT provides broader mechanical compatibility and automotive traceability - all three share identical comparator core functionality and pinout mapping across packages.
Availability
LM2903ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and battery-powered monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2903ST 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 automotive, industrial, and consumer markets.
The LM2903 product line delivers robust, low-cost dual comparators optimized for harsh-environment applications including automotive subsystems, industrial controls, and power management where reliability and wide supply tolerance are critical.
FAQ
Is LM2903ST pin-compatible with other LM2903 package variants?
Yes - LM2903ST (MiniSO8), LM2903PT (TSSOP8), LM2903D (SO8), and LM2903Q2T (DFN8) share identical pin numbering and function mapping per the datasheet Figure 2. Mechanical layout differs, but schematic symbol and net connectivity remain consistent across all variants.
Can LM2903ST drive a 5 V TTL input directly?
Yes - with a 5 V pull-up resistor (typically 4.7 kΩ) on OUT1 or OUT2, LM2903ST sinks current to produce a valid TTL LOW (<0.8 V), and floats to allow the pull-up to establish TTL HIGH (>2.0 V); no level shifter is needed.
What is the maximum differential input voltage the LM2903ST can tolerate?
The LM2903ST supports ±36 V differential input voltage (per Table 1), meaning the voltage difference between IN1+ and IN1−, or IN2+ and IN2−, may reach up to 36 V without damage - exceeding typical supply rails and enabling high-side sensing.
Does LM2903ST require external hysteresis for noise immunity?
Not inherently - the LM2903ST has no built-in hysteresis. However, positive feedback (e.g., 1 MΩ from OUT1 to IN1+) can be added externally to create user-defined hysteresis (e.g., 10–50 mV), essential for clean switching in noisy sensor applications.
LM2903ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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, ±1 V ~ 18V
- :
- 7mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA
- 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-MiniSO
LM2903ST FAQ
1.How can I place an order for LM2903ST through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903ST 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 LM2903ST reliable?
The price and inventory of LM2903ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903ST is usually 5 days.
3.What payment methods are accepted for LM2903ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903ST?
LM2903ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903ST 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 LM2903ST?
For technical support, including LM2903ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903ST requirements.
6.How does Aetrix verify that LM2903ST is sourced from the original manufacturer or authorized distributors?
All LM2903ST 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 LM2903ST meets industry standards.
7.What is the process for return or replacement of LM2903ST?
All LM2903ST units undergo pre-shipment inspection (PSI). If there is an issue with LM2903ST, 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 LM2903ST part is unused and in its original packaging.
Return procedure for LM2903ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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