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Texas Instruments LM2903D
- Part No.:
- LM2903D
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903D.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,626
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Product details
Overview
LM2903D from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, and 1 µs propagation delay. It serves as a precision threshold detector in industrial power supplies and motor control feedback loops.
For engineers reviewing the LM2903D datasheet, LM2903D pinout, LM2903D application, or LM2903D equivalent, this page delivers verified electrical specs, package mapping (SOIC-8), functional pin roles, real-world use cases in server PSUs and cordless tools, and two validated alternative parts with documented technical differences.
Technical Context
The LM2903D implements open-collector output architecture with rail-to-rail common-mode input range extending to ground, enabling direct sensing of low-side current shunts. Its internal ESD clamps provide 2 kV HBM robustness without external protection.
Each comparator operates independently with supply current independent of VCC, supporting stable performance from 2 V up to 36 V. Input bias current is specified at 3.5 nA (typ), allowing high-impedance sensor interfacing without significant loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 36 V - supports wide-input industrial and automotive power rails without regulation |
| Input Offset Voltage | ±0.37 mV (typ) - enables accurate detection of sub-millivolt differential signals |
| Quiescent Current | 200 µA per comparator - allows battery-powered or energy-sensitive designs |
| Propagation Delay | 1 µs (typ) - suitable for fast-response overvoltage/undervoltage monitoring |
| Input Bias Current | 3.5 nA (typ) - minimizes error in high-impedance voltage divider or thermistor networks |
| ESD Rating (HBM) | 2 kV - meets IEC 61000-4-2 Level 2 for board-level handling robustness |
| Output Type | Open-collector - permits wired-OR logic and flexible pull-up to any logic rail (TTL/MOS/CMOS) |
Pinout & Package
LM2903D is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. The package is RoHS-compliant and rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector drain; requires external pull-up for logic-high assertion |
| 1IN− | Comparator 1 inverting input | Accepts reference or feedback signal; common-mode range includes ground |
| 1IN+ | Comparator 1 non-inverting input | Accepts sensed voltage; supports inputs up to VCC without damage |
| GND | Ground reference | Return path for both comparators and internal circuitry |
| 2IN+ | Comparator 2 non-inverting input | Independent input channel; identical electrical behavior to 1IN+ |
| 2IN− | Comparator 2 inverting input | Independent input channel; identical electrical behavior to 1IN− |
| 2OUT | Comparator 2 output | Open-collector drain; electrically isolated from 1OUT |
| VCC | Positive supply | Single supply input; powers both comparators; max 36 V absolute rating |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC − 2 V - enables direct sensing of 0 V referenced signals |
| Differential input voltage tolerance | ±38 V - withstands transient overvoltage between inputs without latch-up |
| Low output saturation voltage | 110 mV at 4 mA sink - reduces power loss and improves noise margin in low-voltage logic interfaces |
| Drop-in replacement capability | Pin- and function-compatible with LM2903, LM393, and LM293 - enables BOM upgrades without layout change |
| Extended temperature grade | −40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
Applications
| Overvoltage Protection in Server PSU | Motor Stall Detection in Cordless Tools |
|---|---|
Use Scenario: Monitors DC bus voltage against a precision reference to trigger shutdown before capacitor overvoltage failure. IC Role / Device Role / Timing Role: Dual comparator configured as window detector with hysteresis; one channel for upper limit, one for lower limit. Use Value: ±0.37 mV offset ensures trip point accuracy within ±10 mV at 12 V rail, reducing false triggers during load transients. | Use Scenario: Detects zero-crossing or sustained low current in motor windings to identify mechanical stall or jam. IC Role / Device Role / Timing Role: Comparator compares shunt voltage against adjustable threshold; open-collector output drives MCU interrupt line. Use Value: 200 µA quiescent current enables always-on monitoring in battery-operated tools without significant runtime penalty. |
| Thermal Trip in Factory Automation | AC Mains Zero-Crossing Detection |
Use Scenario: Interfaces with NTC thermistor network to initiate thermal shutdown when enclosure temperature exceeds safe operating limit. IC Role / Device Role / Timing Role: Single comparator compares thermistor divider output to fixed reference; output controls relay driver. Use Value: Rail-to-rail input range allows direct connection to grounded thermistor node without level-shifting circuitry. | Use Scenario: Converts rectified AC waveform into clean digital zero-crossing pulses for phase-controlled dimming or timing synchronization. IC Role / Device Role / Timing Role: Comparator with hysteresis converts slow-rising AC sine wave into sharp-edged logic transitions. Use Value: 1 µs propagation delay ensures timing jitter < 1 µs at 50/60 Hz, critical for precise phase-angle control in lighting drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903DR | Same SOIC-8 package, identical electrical specs, tape-and-reel packaging variant | No functional difference; optimized for automated SMT assembly | Select LM2903DR for volume production requiring reel-based pick-and-place feeding |
| LM393DT | Lower ESD rating (2 kV HBM same), higher offset (±4 mV max), 0°C to 70°C temp range | Suitable only for commercial-grade applications with relaxed accuracy and ambient temperature limits | Choose LM393DT only if cost sensitivity outweighs need for extended temperature and precision |
Compared with LM2903DR and LM393DT, the LM2903D offers guaranteed −40°C to +125°C operation and tighter offset specification, making it the preferred choice for industrial and automotive systems where reliability across extreme conditions is mandatory.
Availability
LM2903D is available at Aetrix Electronics and suitable for server power supplies, cordless power tools, and factory automation systems requiring stable component supply and long-term manufacturability.
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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LM2903D belongs to TI's legacy dual comparator product line, engineered specifically for robust, low-cost threshold detection in harsh environments including motor drives, power conversion, and safety-critical monitoring circuits.
FAQ
What is the maximum supply voltage rating for LM2903D?
The LM2903D has an absolute maximum supply voltage rating of 36 V. This is confirmed in Section 5.1 Absolute Maximum Ratings of the official TI datasheet SLCS005AH. Operation beyond this voltage risks permanent device damage. For continuous reliable operation, TI recommends staying within the recommended operating condition of 2 V to 36 V, with derating advised above 30 V in high-temperature environments. The LM2903D maintains full functionality across this entire range.
Does LM2903D support rail-to-rail input operation?
Yes, the LM2903D supports rail-to-rail input common-mode voltage range, explicitly including ground (0 V) and extending up to VCC − 2 V. This is documented in Section 5.5 Electrical Characteristics and confirmed in the "Common mode range" parameter table. The feature allows direct interface with grounded sensors and low-side current shunts without level-shifting circuitry, simplifying design in applications like battery monitoring and motor current sensing.
Can LM2903D replace LM2903 in existing designs?
Yes, the LM2903D is a drop-in replacement for the legacy LM2903, as stated in TI's official documentation. It shares identical pinout, package (SOIC-8), and functional behavior while improving key parameters: lower input offset voltage (±0.37 mV vs. ±15 mV), lower supply current (200 µA vs. ~1 mA), and enhanced 2 kV HBM ESD rating. No PCB or schematic changes are required for migration, making it ideal for design refreshes targeting improved accuracy and robustness.
What is the output configuration of LM2903D?
The LM2903D features open-collector outputs on both comparators. As specified in Section 4 Pin Configuration and Functions and Table 4-1, pins 1OUT and 2OUT are open-drain terminals requiring external pull-up resistors to define logic-high voltage levels. This configuration enables wired-OR logic, level translation across different supply domains (e.g., 3.3 V MCU interfacing with 12 V system), and direct driving of LEDs or relay drivers without additional buffering components.
Is LM2903D qualified for automotive applications?
The LM2903D is qualified for industrial temperature range (−40°C to +125°C), matching the LM2903V and LM2903AV specifications. While not AEC-Q200 certified out-of-box, its extended temperature rating and robustness (2 kV HBM, ±38 V differential input) make it suitable for under-hood and chassis-mounted applications where full automotive qualification is not mandated. For AEC-Q200–compliant designs, TI recommends verifying system-level validation per customer requirements, as LM2903D itself is not marketed as an automotive-grade part.
LM2903D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
- 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.
LM2903D 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
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