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STMicroelectronics LM2903WYDT
- Part No.:
- LM2903WYDT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903WYDT.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,950
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Product details
Overview
LM2903WYDT from STMicroelectronics is a dual, low-power voltage comparator in SO-8 package, operating from single supply (2–36 V) or dual supplies (±1 V to ±18 V), with 0.4 mA supply current per comparator, 25 nA input bias current, and rail-to-rail input common-mode range including negative rail - used in automotive window lift control logic and battery voltage monitoring circuits.
For engineers reviewing the LM2903WYDT datasheet, LM2903WYDT pinout, LM2903WYDT application, or LM2903WYDT equivalent, key selection criteria include input offset voltage (1–15 mV), output sink capability (6–16 mA), ESD rating (2 kV HBM), and AEC-Q100 qualified automotive grade reliability.
Technical Context
The LM2903WYDT 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 TTL/CMOS/MOS logic interfacing and allow wired-OR configurations.
Designed for automotive environments, it features guaranteed operation from −40 °C to +125 °C, 2 kV HBM ESD protection on all pins, and differential input voltage tolerance up to full supply rails - critical for noisy sensor signal conditioning in engine control units.
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 wide-input automotive battery systems including cold-crank and load-dump conditions. |
| Supply Current | 0.4 mA per comparator at 5 V - enables ultra-low-power wake-up detection in always-on vehicle modules. |
| Input Bias Current | 25 nA typ. - minimizes loading on high-impedance sensor bridges and thermistor networks. |
| Input Offset Voltage | 1–15 mV - defines minimum detectable voltage difference in precision threshold detection (e.g., battery undervoltage lockout). |
| Output Sink Current | 6–16 mA at VO = 1.5 V - drives LEDs, relays, or logic inputs directly without external pull-ups in discrete interface designs. |
| ESD Rating | 2 kV HBM - meets automotive board-level robustness requirements per ISO 10605. |
| Operating Temperature | −40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and cabin applications. |
Pinout & Package
LM2903WYDT is housed in an SO-8 plastic micropackage (ECOPACK® compliant), 4.9 mm × 6.0 mm body, 1.27 mm pitch, with exposed pad not connected internally. Pin 4 is VCC− (GND in single-supply use); Pin 8 is VCC+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 | Open-collector output - requires external pull-up to define logic HIGH level and interface voltage domain. |
| 2 | Inverting Input 1 | PNP-based input - accepts voltages down to VCC− (including negative rail), enabling ground-referenced sensing. |
| 3 | Non-inverting Input 1 | Same PNP structure as Pin 2 - supports rail-to-rail common-mode range and differential sensing across full supply. |
| 4 | VCC− | Negative supply or GND reference - establishes lower rail for dual- or single-supply operation. |
| 5 | Non-inverting Input 2 | Independent second comparator input - allows dual-threshold or window detection without external components. |
| 6 | Inverting Input 2 | Second comparator inverting input - enables hysteresis implementation via feedback to either input. |
| 7 | Output 2 | Open-collector output identical to Pin 1 - supports independent load switching or OR-ing with Output 1. |
| 8 | VCC+ | Positive supply connection - powers both comparators; tolerates transients up to 36 V. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes VCC− - eliminates need for level-shifting when comparing signals referenced to ground in 12 V automotive systems. |
| Low quiescent current | 0.4 mA per comparator at 5 V - reduces standby power in always-on modules such as body control units. |
| Open-collector outputs | Supports mixed-voltage interfacing (e.g., 5 V comparator driving 3.3 V MCU GPIO) via external pull-up selection. |
| AEC-Q100 qualified | Grade 1 (−40 °C to +125 °C) - validated for automotive powertrain, chassis, and comfort electronics. |
| 2 kV HBM ESD protection | Integrated on-chip clamping - removes need for external TVS diodes in cost-sensitive PCB layouts. |
Applications
| Automotive Battery Monitoring | Window Lift Overcurrent Detection |
|---|---|
Use Scenario: Real-time monitoring of 12 V lead-acid battery voltage during ignition cycles and accessory mode. IC Role / Device Role / Timing Role: Dual comparator implements undervoltage (≤11.5 V) and overvoltage (≥14.8 V) thresholds with hysteresis. Use Value: Prevents ECU brown-out and alternator regulator damage using only two resistive dividers and one capacitor. | Use Scenario: Detecting motor stall current during power window ascent/descent to trigger automatic reversal. IC Role / Device Role / Timing Role: Compares amplified shunt voltage against programmable thresholds to assert fault signal within 1.3 µs. Use Value: Meets ISO 11853 pinch-protection timing requirements without microcontroller intervention. |
| Engine Coolant Level Sensing | Seat Position Feedback Interface |
Use Scenario: Interfacing capacitive coolant level sensor with analog front-end in engine bay. IC Role / Device Role / Timing Role: Converts capacitance-to-voltage signal into digital HIGH/LOW using relaxation oscillator topology. Use Value: Enables direct MCU GPIO input without ADC, reducing BOM count and firmware complexity. | Use Scenario: Converting potentiometer wiper voltage from seat track position sensor into discrete zone signals. IC Role / Device Role / Timing Role: Window comparator formed by both LM2903WYDT sections detects three linear position ranges (front/middle/rear). Use Value: Eliminates need for dedicated analog switch or multiplexer in memory seat control 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 |
|---|---|---|---|
| LM2903DR | SO-8, non-automotive grade (−25 °C to +85 °C), no AEC-Q100 qualification, same electrical specs. | Not suitable for under-hood or safety-critical modules requiring extended temperature or stress screening. | Select for cost-sensitive consumer or industrial applications where ambient temperature stays below 85 °C. |
| TLV3702IDR | Rail-to-rail input/output, 85 µA supply current, 1.8–16 V supply, 1.2 mV offset - lower power but narrower voltage range. | Lacks 36 V tolerance and automotive qualification; unsuitable for 24 V commercial vehicles or load-dump immunity. | Prefer for battery-powered portable devices needing ultra-low IQ and rail-to-rail output swing. |
Compared with LM2903DR and TLV3702IDR, the LM2903WYDT uniquely combines AEC-Q100 Grade 1 qualification, 36 V absolute maximum supply, and negative-rail input capability - making it the only choice for robust dual-threshold detection in automotive power domains.
Availability
LM2903WYDT is available at Aetrix Electronics and suitable for automotive battery management, window lift control, engine coolant sensing, and seat position feedback requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM2903WYDT 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 ICs, sensors, and analog products for automotive, industrial, and consumer markets.
The LM2903W series belongs to ST's precision analog comparators product line, engineered specifically for automotive-grade signal conditioning where reliability, wide supply range, and rail-compatible inputs are mandatory.
FAQ
What is the maximum differential input voltage the LM2903WYDT can withstand?
The LM2903WYDT supports differential input voltage equal to the full supply voltage (VCC+ − VCC−), up to 36 V. This is explicitly guaranteed in the Absolute Maximum Ratings table and enables direct comparison of signals spanning the entire supply rail without external attenuation or clamping.
Can the LM2903WYDT operate with VCC− disconnected in single-supply mode?
No - Pin 4 (VCC−) must be connected to system ground (or negative rail) in all configurations. Leaving it floating violates absolute maximum ratings and risks latch-up or undefined output behavior, as confirmed in the "Description" section and Figure 1 schematic.
Does the LM2903WYDT require external hysteresis for stable switching?
Yes - the device has no internal hysteresis. Stable threshold detection in noisy environments (e.g., automotive alternator ripple) requires external positive feedback, typically via resistor from output to non-inverting input, as shown in Figures 14 and 15 of the datasheet.
Is the SO-8 package of LM2903WYDT lead-free and RoHS compliant?
Yes - the LM2903WYDT uses ST's ECOPACK®2-compliant SO-8 package, certified lead-free and RoHS compliant per Directive 2011/65/EU, with matte tin terminal finish and halogen-free molding compound, as documented in Section 5 of the datasheet.
LM2903WYDT 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 @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- 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
LM2903WYDT FAQ
1.How can I place an order for LM2903WYDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903WYDT 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 LM2903WYDT reliable?
The price and inventory of LM2903WYDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903WYDT is usually 5 days.
3.What payment methods are accepted for LM2903WYDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903WYDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903WYDT?
LM2903WYDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903WYDT 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 LM2903WYDT?
For technical support, including LM2903WYDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903WYDT requirements.
6.How does Aetrix verify that LM2903WYDT is sourced from the original manufacturer or authorized distributors?
All LM2903WYDT 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 LM2903WYDT meets industry standards.
7.What is the process for return or replacement of LM2903WYDT?
All LM2903WYDT units undergo pre-shipment inspection (PSI). If there is an issue with LM2903WYDT, 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 LM2903WYDT part is unused and in its original packaging.
Return procedure for LM2903WYDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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