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Texas Instruments LM2903DRG4
- Part No.:
- LM2903DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903DRG4.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,015
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Product details
Overview
LM2903DRG4 from Texas Instruments is a dual precision voltage comparator 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 operates over –40°C to +125°C and is widely used in overvoltage protection circuits within server PSUs and motor drive control stages.
For engineers reviewing the LM2903DRG4 datasheet, LM2903DRG4 pinout, LM2903DRG4 application, or LM2903DRG4 equivalent, this page delivers verified electrical specifications, SOIC-8 package details, real-world use cases in industrial power systems, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM2903DRG4 implements an open-collector output architecture with rail-to-rail input common-mode range extending to ground, enabling direct sensing of low-side current shunts and battery voltages. Its internal ESD clamps provide 2 kV HBM robustness without external protection.
It supports TTL-, MOS-, and CMOS-compatible outputs via external pull-up, with guaranteed sinking capability up to 21 mA at 5 V supply and low-level output voltage ≤400 mV at 4 mA load - critical for reliable logic interfacing in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - enables direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial rails without level-shifting. |
| Input Offset Voltage (typ) | ±0.37 mV - ensures accurate threshold detection in precision voltage monitoring (e.g., ±1% window comparators). |
| Quiescent Current | 400–600 µA total (200 µA/comparator) - supports always-on supervision in energy-sensitive embedded systems. |
| Propagation Delay | 1 µs (typ, 5 mV overdrive) - meets timing requirements for fast fault response in UPS and motor drive enable/disable logic. |
| Output Sink Current | 21 mA (min) at VOL ≤ 400 mV - drives standard LED indicators, optocouplers, or small relays directly. |
| ESD Rating (HBM) | ±2000 V - withstands handling and board-level ESD events without latch-up or parametric shift. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, factory automation, and industrial power converter applications. |
Pinout & Package
LM2903DRG4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with gull-wing leads suitable for automated surface-mount assembly and reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector node requiring external pull-up; sinks current when IN+ > IN−. |
| 1IN− | Inverting input (Comp 1) | Accepts reference or feedback signal; common-mode range includes ground. |
| 1IN+ | Non-inverting input (Comp 1) | Accepts sensed voltage (e.g., shunt, battery); differential input range ±38 V. |
| GND | Ground reference | Return path for both comparators and bias circuitry; connects to system 0 V plane. |
| 2IN+ | Non-inverting input (Comp 2) | Independent second channel input; supports dual-threshold or window detection. |
| 2IN− | Inverting input (Comp 2) | Second reference input; usable for hysteresis feedback or independent comparison. |
| 2OUT | Comparator 2 output | Independent open-collector output; enables asynchronous dual-event triggering. |
| VCC | Positive supply | Single supply input (2–36 V); powers both comparators and internal bias networks. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC − 2 V - allows direct sensing of 0 V-referenced signals like current shunts. |
| Low input bias current (3.5 nA typ) | Minimizes error in high-impedance sensor interfaces (e.g., thermistor dividers, photodiode amps). |
| Fast 1 µs response time | Enables real-time overvoltage/overcurrent shutdown in power supplies before damage occurs. |
| Output compatible with TTL/MOS/CMOS | Supports direct connection to microcontroller GPIOs, FPGAs, or logic gates using standard pull-up resistors. |
| Differential input voltage range ±38 V | Permits safe comparison of signals referenced to different potentials (e.g., isolated bus monitoring). |
Applications
| Server PSU Monitoring | Motor Drive Enable Logic |
|---|---|
|
Use Scenario: Real-time detection of DC bus overvoltage (>12.6 V) and undervoltage (<11.4 V) in 12 V server power supplies. IC Role / Device Role / Timing Role: Dual comparator configured as window detector; one channel monitors upper threshold, the other lower threshold. Use Value: Triggers immediate shutdown via open-collector outputs pulling down enable lines, preventing MOSFET failure during transient surges. |
Use Scenario: Validating encoder zero-crossing and current sense thresholds before enabling three-phase inverter gate drivers. IC Role / Device Role / Timing Role: Comparator 1 validates rotor position; Comparator 2 verifies phase current < 50 mA prior to PWM start. Use Value: Ensures safe startup sequence with sub-microsecond response, eliminating shoot-through risk in IGBT modules. |
| Vacuum Robot Safety Interlock | Single-Phase UPS Battery Health Check |
|
Use Scenario: Monitoring vacuum pressure sensor output against dual thresholds to halt motion if pressure deviates beyond ±5% of setpoint. IC Role / Device Role / Timing Role: Configured as hysteresis comparator using feedback resistor; rejects noise from pump vibration. Use Value: Prevents mechanical collision by disabling servo amplifiers within 1.2 µs of out-of-tolerance detection. |
Use Scenario: Periodic measurement of 24 V lead-acid battery voltage during UPS standby to flag cells below 2.1 V/cell. IC Role / Device Role / Timing Role: One comparator compares battery voltage to precision 25.2 V reference; second validates temperature-compensated cutoff. Use Value: Extends battery service life by avoiding deep discharge while maintaining fail-safe runtime estimation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903DT | Same B-version specs, but in SOIC-8 with tighter AEC-Q200 qualification for automotive-grade temperature cycling. | Preferred for automotive body control modules where extended reliability validation is mandated. | Select LM2903DT when automotive qualification and long-term field reliability outweigh cost sensitivity. |
| TLV1702IDR | Lower offset (0.8 mV max), rail-to-rail inputs/outputs, but higher IQ (120 µA/comparator) and narrower supply (2.7–36 V). | Suitable for battery-powered portable equipment needing full-swing output swing and ultra-low power. | Choose TLV1702IDR only when rail-to-rail output swing and sub-1 mV offset are required - not a drop-in replacement. |
Compared with LM2903DRG4, LM2903DT offers identical performance with enhanced automotive qualification, while TLV1702IDR trades higher cost and non-drop-in compatibility for rail-to-rail output and marginally better offset - making LM2903DRG4 optimal for cost-sensitive industrial power monitoring.
Availability
LM2903DRG4 is available at Aetrix Electronics and suitable for server PSU monitoring, motor drive enable logic, and vacuum robot safety interlocks requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM2903DRG4 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 specializing in analog and embedded processing technologies, with over 50 years of innovation in precision signal conditioning and power management ICs.
The LM2903B family - including LM2903DRG4 - was engineered for industrial and automotive power systems demanding wide supply range, ground-sensing capability, and robust ESD tolerance in harsh operating environments.
FAQ
What is the maximum supply voltage rating for LM2903DRG4?
The LM2903DRG4 supports a maximum supply voltage of 36 V, with absolute maximum ratings extending to 38 V for short-duration transients. This allows direct use in 24 V industrial systems and 36 V battery-powered equipment without external regulation, while maintaining guaranteed operation across its full –40°C to +125°C temperature range.
Does LM2903DRG4 support ground-referenced input signals?
Yes, LM2903DRG4 features a common-mode input voltage range that includes ground (0 V), enabling direct interface with low-side current shunt amplifiers, battery negative terminals, and other signals referenced to system ground - a key advantage over older comparator families with limited input range.
Can LM2903DRG4 drive a 5 V microcontroller GPIO directly?
Yes, LM2903DRG4's open-collector outputs can interface directly with 5 V GPIOs using a pull-up resistor to 5 V. When active, it sinks current to pull the line low; when inactive, the GPIO reads high via the pull-up. No level-shifter is needed, provided the microcontroller input leakage is within spec.
What is the typical propagation delay of LM2903DRG4 at 5 V supply?
The LM2903DRG4 exhibits a typical propagation delay of 1 µs under standard test conditions (5 V supply, 5 mV input overdrive, 15 pF load). This value remains stable across temperature (–40°C to +125°C) and supply voltage (2–36 V), ensuring predictable timing in fault-detection circuits.
Is LM2903DRG4 pin-compatible with legacy LM2903 variants?
Yes, LM2903DRG4 is a B-version upgrade and maintains identical SOIC-8 pinout and footprint with all prior LM2903, LM2903A, and LM2903V devices. It serves as a drop-in replacement offering improved offset, ESD rating, and supply voltage range without PCB layout changes.
LM2903DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
LM2903DRG4 FAQ
1.How can I place an order for LM2903DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903DRG4 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 LM2903DRG4 reliable?
The price and inventory of LM2903DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903DRG4 is usually 5 days.
3.What payment methods are accepted for LM2903DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903DRG4?
LM2903DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903DRG4 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 LM2903DRG4?
For technical support, including LM2903DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903DRG4 requirements.
6.How does Aetrix verify that LM2903DRG4 is sourced from the original manufacturer or authorized distributors?
All LM2903DRG4 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 LM2903DRG4 meets industry standards.
7.What is the process for return or replacement of LM2903DRG4?
All LM2903DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2903DRG4, 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 LM2903DRG4 part is unused and in its original packaging.
Return procedure for LM2903DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903DRG4 Tags
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