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Texas Instruments LM2903DG4
- Part No.:
- LM2903DG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903DG4.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,087
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Product details
Overview
LM2903DG4 from Texas Instruments is a dual precision voltage comparator designed for single-supply operation across 2 V to 36 V. It delivers ±0.37 mV typical input offset voltage, 1 µs propagation delay, 200 µA per comparator quiescent current, and rail-to-rail input capability down to ground-enabling accurate threshold detection in industrial power supply monitoring and motor control feedback loops.
For engineers reviewing the LM2903DG4 datasheet, LM2903DG4 pinout, LM2903DG4 application, or LM2903DG4 equivalent, this page provides verified electrical specifications, SOIC-8 package terminal mapping, real-world use cases in server PSUs and factory automation, and two validated alternative comparators with documented functional and thermal differences.
Technical Context
The LM2903DG4 implements open-collector output architecture with independent dual comparators sharing a common ground and VCC rail. Its input stage supports common-mode voltages from –0.1 V to (VCC – 2 V), enabling direct sensing of signals referenced to ground or near-rail voltages without level-shifting circuitry.
Propagation delay is characterized at 1 µs under 5 mV overdrive with 15 pF load and 5.1 kΩ pull-up, while ESD robustness meets 2 kV HBM per JEDEC JS-001-critical for reliability in automated test equipment and embedded control interfaces where transient immunity is non-negotiable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports wide-input industrial supplies without external regulation |
| Input Offset Voltage (typ) | ±0.37 mV - enables sub-millivolt threshold accuracy in precision voltage monitoring |
| Quiescent Current (per comp) | 200 µA - allows battery-backed or low-power always-on sensing applications |
| Propagation Delay (typ) | 1 µs - ensures fast response for overvoltage/undervoltage fault detection in PSU protection |
| Input Bias Current (typ) | 3.5 nA - minimizes loading error on high-impedance sensor outputs like thermistors |
| ESD Rating (HBM) | 2000 V - withstands handling and board-level transients in manufacturing environments |
| Output Type | Open-collector - permits wired-OR logic, level translation, and flexible pull-up selection |
Pinout & Package
LM2903DG4 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and 1.27 mm lead pitch. Thermal performance is characterized by RθJA = 148.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector drain; requires external pull-up for logic-high assertion |
| 1IN− | Inverting input (Comp 1) | Negative reference input; accepts voltages down to –0.1 V relative to GND |
| 1IN+ | Non-inverting input (Comp 1) | Signal input; common-mode range extends to (VCC – 2 V) |
| GND | Ground reference | Common return for both comparators and internal bias network |
| 2IN+ | Non-inverting input (Comp 2) | Independent signal path; no crosstalk with Comp 1 inputs |
| 2IN− | Inverting input (Comp 2) | Supports differential sensing or independent threshold comparison |
| 2OUT | Comparator 2 output | Open-collector output; electrically isolated from 1OUT |
| VCC | Positive supply | Single rail powers both comparators; quiescent current independent of VCC |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to (VCC – 2 V), eliminating need for input biasing resistors |
| Differential input voltage tolerance | ±38 V - withstands large input transients without latch-up or damage |
| Low output saturation voltage | 110 mV at 4 mA sink - reduces power loss and improves noise margin in TTL/MOS interface |
| Temperature range | –40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions |
| Drop-in replacement capability | Pin- and function-compatible with legacy LM2903, LM393, and LM293 variants |
Applications
| Server Power Supply Monitoring | Factory Automation Sensor Interface |
|---|---|
Use Scenario: Real-time monitoring of +12 V and +5 V rails in redundant server PSUs to trigger shutdown on overvoltage or undervoltage faults. IC Role / Device Role / Timing Role: Dual comparator performs independent high/low threshold detection on each rail with <1 µs response to prevent downstream component damage. Use Value: Enables compliance with ATX specification fault response times while reducing BOM count versus discrete solutions. | Use Scenario: Converting analog 0–10 V position feedback from linear actuators into clean digital enable/disable signals for PLC-controlled motion sequences. IC Role / Device Role / Timing Role: Comparator 1 detects actuator reach; Comparator 2 validates safety interlock status before enabling next motion phase. Use Value: Eliminates microcontroller ADC polling overhead and provides deterministic, hardware-level timing critical for safety-critical sequencing. |
| Motor Drive Overcurrent Protection | Wireless Infrastructure DC-DC Converter Supervision |
Use Scenario: Sampling shunt voltage across H-bridge MOSFETs to detect short-circuit events during brushless DC motor commutation. IC Role / Device Role / Timing Role: Fast 1 µs propagation delay allows detection within first PWM cycle, triggering immediate gate disable via dedicated fault pin. Use Value: Prevents thermal runaway and MOSFET destruction without requiring high-speed microcontroller intervention. | Use Scenario: Monitoring multiple isolated DC-DC converter outputs (e.g., +3.3 V, +1.8 V) in 5G base station RF modules for brownout detection and graceful reset sequencing. IC Role / Device Role / Timing Role: Two independent comparators provide simultaneous voltage supervision with separate pull-up networks tied to different domain supplies. Use Value: Ensures reliable power sequencing across mixed-voltage domains while minimizing PCB area versus dual-single comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual open-collector comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903DR | Same SOIC-8 package, identical electrical specs, but rated for commercial temperature range (0°C to 70°C) instead of industrial (–40°C to 125°C) | Limited to non-extended ambient environments; unsuitable for under-hood or uncooled industrial enclosures | Select LM2903DR only when full industrial temp range is not required and cost optimization is primary |
| TLV3702IDR | Lower 85 µA quiescent current, rail-to-rail input/output, but 1.8 V to 16 V supply range and 2.5 µs propagation delay | Better for ultra-low-power battery systems; insufficient for 24 V/36 V industrial supplies or sub-µs fault response | Choose TLV3702IDR for portable equipment with tight power budgets, not for high-voltage or high-speed protection |
Compared with LM2903DR and TLV3702IDR, the LM2903DG4 uniquely balances industrial temperature resilience, 36 V operation, and 1 µs speed-making it optimal for mission-critical power supervision where environmental ruggedness and timing determinism are jointly essential.
Availability
LM2903DG4 is available at Aetrix Electronics and suitable for server power supply monitoring, factory automation sensor interfaces, and motor drive overcurrent protection requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2903DG4 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 for industrial, automotive, and communications markets.
The LM2903 family was engineered as a robust, drop-in upgrade to legacy comparators-prioritizing industrial-grade reliability, wide supply range, and compatibility with existing designs using LM393 or LM293 footprints.
FAQ
What is the maximum supply voltage rating for LM2903DG4?
The LM2903DG4 supports a maximum supply voltage of 36 V, confirmed in Section 5.1 Absolute Maximum Ratings of the TI SLCS005AH datasheet. This exceeds legacy LM2903 versions (rated to 32 V), enabling direct use in 24 V industrial systems with headroom for transient spikes without external clamping.
Does LM2903DG4 support input voltages below ground?
Yes-the LM2903DG4 allows input voltages down to –0.1 V relative to GND, as specified in Section 5.2 Recommended Operating Conditions. This rail-to-ground input capability eliminates the need for negative biasing networks when interfacing with sensors whose outputs swing slightly negative during transients.
Can LM2903DG4 replace LM2903 in existing designs without layout changes?
Yes-LM2903DG4 is a pin-compatible, functionally identical drop-in replacement for LM2903 in SOIC-8 packages, per TI's Family Comparison Table and Section 3 Description. No PCB modifications are needed; however, verify that the improved 36 V rating and lower offset voltage align with system-level tolerance margins.
What is the typical propagation delay of LM2903DG4 under standard test conditions?
The LM2903DG4 exhibits a typical propagation delay of 1 µs for high-to-low transitions with 5 mV input overdrive, 15 pF load, and 5.1 kΩ pull-up resistor, as measured in Section 5.7 Switching Characteristics. This value holds across the full –40°C to +125°C operating range, ensuring consistent timing behavior in thermal-cycling environments.
Is LM2903DG4 qualified for automotive applications?
No-while LM2903DG4 operates from –40°C to +125°C, it is not AEC-Q100 qualified. For automotive use, TI recommends the LM2903QDRQ1 (AEC-Q100 Grade 1) or LM2903BQDRQ1 (B-version with enhanced specs), which undergo additional stress testing and PPAP documentation required for vehicle subsystems.
LM2903DG4 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
LM2903DG4 FAQ
1.How can I place an order for LM2903DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903DG4 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 LM2903DG4 reliable?
The price and inventory of LM2903DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903DG4 is usually 5 days.
3.What payment methods are accepted for LM2903DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903DG4?
LM2903DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903DG4 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 LM2903DG4?
For technical support, including LM2903DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903DG4 requirements.
6.How does Aetrix verify that LM2903DG4 is sourced from the original manufacturer or authorized distributors?
All LM2903DG4 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 LM2903DG4 meets industry standards.
7.What is the process for return or replacement of LM2903DG4?
All LM2903DG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2903DG4, 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 LM2903DG4 part is unused and in its original packaging.
Return procedure for LM2903DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903DG4 Tags
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