My Inquiry
My Account
STMicroelectronics LM2903YDT
- Part No.:
- LM2903YDT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903YDT.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,660
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2903YDT from STMicroelectronics is an automotive-grade, low-power dual voltage comparator in SO8 package, operating from +2 V to +36 V single supply (or ±1 V to ±18 V dual supply), with 25 nA typical input bias current, 250 mV typical low output saturation voltage at 4 mA sink, and input common-mode range extending to the negative rail. It enables robust zero-crossing detection and level sensing in engine control units and battery monitoring systems.
For engineers reviewing the LM2903YDT datasheet, LM2903YDT pinout, LM2903YDT application, or LM2903YDT equivalent, this page delivers verified electrical parameters, automotive-qualified thermal and ESD specs (AEC-Q100 qualified), SO8 pin mapping, real-world use cases in powertrain and body electronics, and validated alternative options for design flexibility.
Technical Context
The LM2903YDT integrates two independent comparators with PNP input stages, enabling rail-to-rail input operation down to the negative supply-even under single-supply conditions-while maintaining TTL/CMOS-compatible open-collector outputs. Its differential input voltage range equals the full supply voltage (±36 V), supporting high-side sensing without level-shifting.
It features a 1.3 µs small-signal response time (100 mV step, 5 mV overdrive) and guaranteed large-signal response ≤500 ns (TTL input, 95% settling), with supply current fixed at 0.4 mA per comparator across 5–30 V, ensuring predictable power budgeting in always-on automotive modules.
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 - supports direct connection to 12 V/24 V vehicle batteries without regulation. |
| Input Bias Current | 25 nA typ. - minimizes loading on high-impedance sensor references (e.g., thermistors, potentiometers). |
| Input Offset Voltage | 1–15 mV - enables accurate threshold detection in analog signal conditioning with <10 mV hysteresis margins. |
| Output Saturation Voltage | 250 mV typ. at 4 mA sink - ensures reliable logic-low assertion into 5 V TTL/CMOS inputs with margin. |
| Response Time | 1.3 µs small-signal, ≤500 ns large-signal (95%) - suitable for crankshaft position sensing and PWM feedback loops. |
| ESD Rating | 800 V HBM, 1.5 kV CDM (SO8) - meets automotive board-level ESD immunity requirements per ISO 10605. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood applications including engine control and transmission modules. |
Pinout & Package
LM2903YDT is supplied in SO8 (plastic micropackage), compliant with ECOPACK environmental standards and AEC-Q100 Grade 1 qualification. The exposed pad is optional and may be left floating or connected to ground for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector NPN output - requires external pull-up to define logic-high level and drive load. |
| 2 (IN1−) | Comparator 1 inverting input | Differential input node - accepts signals down to −0.3 V, enabling ground-referenced sensing. |
| 3 (IN1+) | Comparator 1 non-inverting input | Differential input node - supports reference voltages up to VCC+ −1.5 V. |
| 4 (VCC−) | Negative supply / ground | Reference return path - input common-mode extends to this pin, critical for single-supply rail-to-rail operation. |
| 5 (IN2+) | Comparator 2 non-inverting input | Independent input - identical electrical behavior to IN1+, allowing dual-threshold or window detection. |
| 6 (IN2−) | Comparator 2 inverting input | Independent input - supports differential or single-ended configurations with same offset/bias specs. |
| 7 (OUT2) | Comparator 2 output | Open-collector NPN output - electrically isolated from OUT1; enables independent load switching. |
| 8 (VCC+) | Positive supply | Primary power input - supplies both comparators; current draw remains stable (0.4 mA/comparator) from 5–30 V. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes negative rail (VCC−) - eliminates need for input biasing networks in single-supply sensor interfaces. |
| Low quiescent current | 0.4 mA per comparator at 5 V - reduces standby power in always-on vehicle modules (e.g., door lock controllers). |
| TTL/CMOS/MOS/ECL compatible outputs | Open-collector structure with 250 mV saturation - simplifies interfacing to diverse logic families without level shifters. |
| Wide supply voltage tolerance | +2 V to +36 V - accommodates cold-crank (6 V) and load-dump (36 V) transients without external protection. |
| Automotive qualification | AEC-Q100 Grade 1, -40 °C to +125 °C - certified for powertrain, chassis, and body control unit deployment. |
Applications
| Engine Crankshaft Position Sensing | Battery Voltage Monitor |
|---|---|
|
Use Scenario: Detecting magnetic pickup coil zero crossings to determine crankshaft angular position and speed in ICE engine management. IC Role / Device Role / Timing Role: Dual comparator configured as Schmitt-trigger zero-crossing detector with hysteresis, converting analog sine wave to clean digital timing pulses. Use Value: 1.3 µs response and rail-to-rail input enable accurate pulse timing down to 50 rpm; low input bias avoids signal distortion from high-impedance coil sources. |
Use Scenario: Monitoring 12 V lead-acid battery voltage to trigger low-voltage warnings and prevent deep discharge in start-stop systems. IC Role / Device Role / Timing Role: Dual comparator implementing window detection - one channel for under-voltage (11.0 V), second for over-voltage (14.8 V) thresholds. Use Value: Input offset voltage ≤15 mV ensures threshold accuracy within ±0.1 V; 0.4 mA total supply current minimizes parasitic drain during vehicle sleep mode. |
| Brake Light Activation Logic | Seat Belt Buckle Detection |
|
Use Scenario: Converting analog brake pedal position sensor output into ON/OFF brake light control signal with noise immunity. IC Role / Device Role / Timing Role: Single comparator with RC-filtered input and hysteresis, rejecting EMI from nearby motors and solenoids. Use Value: 800 V HBM ESD rating withstands handling and assembly stress; 250 mV output saturation guarantees solid logic-low to LED driver ICs. |
Use Scenario: Detecting mechanical closure of seat belt buckle via resistive or microswitch interface in occupant classification systems. IC Role / Device Role / Timing Role: Comparator acting as contact closure detector - comparing switch voltage drop against precision reference generated by onboard resistor divider. Use Value: Input bias current ≤25 nA prevents false triggering from leakage across dirty or aged contacts; −40 °C to +125 °C operation covers cabin temperature extremes. |
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 |
|---|---|---|---|
| LM2903WDT | Higher ESD rating: 2 kV HBM, 2 kV CDM - achieved via enhanced process hardening. | Targeted at high-noise environments (e.g., EV power inverters) where board-level ESD exceeds 1 kV. | Select when system-level ESD testing per ISO 10605 requires >1.5 kV CDM margin beyond LM2903YDT's 1.5 kV spec. |
| LM2903HDT | Extended temperature range: −40 °C to +150 °C - qualified for under-hood transmission control units. | Required for automatic transmission solenoid drivers and oil temperature sensors near hot exhaust manifolds. | Choose only if ambient operating temperature exceeds +125 °C; otherwise LM2903YDT offers optimal cost/performance balance. |
Compared with LM2903WDT and LM2903HDT, the LM2903YDT provides the best trade-off of automotive qualification, thermal performance, and ESD robustness for mainstream engine control and body electronics - delivering AEC-Q100 compliance without over-specifying for environments that don't require 150 °C operation or 2 kV ESD.
Availability
LM2903YDT is available at Aetrix Electronics and suitable for engine control units, battery management systems, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for LM2903YDT 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 devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The LM2903 product line delivers precision, low-power dual comparators optimized for automotive signal conditioning - engineered to meet AEC-Q100 reliability standards while supporting wide supply ranges and rail-to-rail input operation.
FAQ
What is the maximum differential input voltage the LM2903YDT can tolerate?
The LM2903YDT supports a differential input voltage (Vid) of ±36 V, matching its absolute maximum supply voltage rating. This allows direct comparison of signals referenced to different potentials - for example, detecting voltage drops across shunt resistors in high-side current sensing - without external attenuation or clamping diodes.
Can the LM2903YDT operate from a single 3.3 V supply?
Yes - the LM2903YDT functions across +2 V to +36 V single supply. At 3.3 V, it maintains 25 nA typical input bias current and 250 mV typical output saturation voltage at 4 mA sink. However, output logic-high level depends on the external pull-up voltage, which may be set to 3.3 V or higher to ensure compatibility with downstream logic.
Is the SO8 package of LM2903YDT lead-free and RoHS compliant?
Yes - the LM2903YDT SO8 package is manufactured per STMicroelectronics' ECOPACK2 standard, fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead-free solderability is verified per J-STD-020 moisture sensitivity level 3 (MSL3) and JEDEC J-STD-002B wetting balance testing.
Does the LM2903YDT require external hysteresis for stable switching?
Yes - as a comparator without built-in hysteresis, the LM2903YDT benefits from external positive feedback (e.g., resistor from output to non-inverting input) to prevent oscillation near threshold due to noise or slow input edges. Typical hysteresis values range from 10–50 mV, achievable with standard 1% resistors and aligned with its 1–15 mV input offset voltage.
LM2903YDT 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, 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:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM2903YDT FAQ
1.How can I place an order for LM2903YDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903YDT 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 LM2903YDT reliable?
The price and inventory of LM2903YDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903YDT is usually 5 days.
3.What payment methods are accepted for LM2903YDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903YDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903YDT?
LM2903YDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903YDT 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 LM2903YDT?
For technical support, including LM2903YDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903YDT requirements.
6.How does Aetrix verify that LM2903YDT is sourced from the original manufacturer or authorized distributors?
All LM2903YDT 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 LM2903YDT meets industry standards.
7.What is the process for return or replacement of LM2903YDT?
All LM2903YDT units undergo pre-shipment inspection (PSI). If there is an issue with LM2903YDT, 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 LM2903YDT part is unused and in its original packaging.
Return procedure for LM2903YDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903YDT Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
