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Texas Instruments LM2903QDRG4
- Part No.:
- LM2903QDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903QDRG4.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,812
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Product details
Overview
LM2903QDRG4 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, 1 µs propagation delay, and rail-to-rail input capability including ground. It serves as the output stage in overvoltage protection circuits, battery monitoring systems, and industrial sensor interface modules.
For engineers reviewing the LM2903QDRG4 datasheet, LM2903QDRG4 pinout, LM2903QDRG4 application, or LM2903QDRG4 equivalent, this page delivers verified electrical specifications, SOIC-8 package terminal mapping, B-version performance advantages over legacy LM2903, and validated alternative options for automotive-grade voltage comparison designs requiring extended temperature range (–40°C to +125°C) and enhanced ESD robustness (2 kV HBM).
Technical Context
The LM2903QDRG4 implements two independent open-collector comparators with input common-mode range extending to ground and differential input voltage tolerance up to ±38 V. Its architecture supports direct interfacing with TTL, MOS, and CMOS logic without level-shifting circuitry.
Designed as the B-version upgrade of the LM2903 family, it delivers improved input offset voltage (±4 mV max over temperature), lower input bias current (3.5 nA typ), and faster response time (1 µs typ) while maintaining full drop-in compatibility with legacy LM2903, LM2903V, and LM2903AV variants in SOIC-8 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - enables direct use in 3.3 V, 5 V, 12 V, and 24 V industrial and automotive power rails without regulation. |
| Input Offset Voltage (max) | ±4 mV over –40°C to +125°C - ensures accurate threshold detection in precision battery cell monitoring and motor phase sensing. |
| Quiescent Current | 600 µA typical at 5 V - supports low-power always-on supervision in energy-sensitive embedded control applications. |
| Propagation Delay | 1 µs typical at 5 V - provides timely fault response in overcurrent shutdown and UPS transfer switching circuits. |
| ESD Rating (HBM) | 2000 V - meets IEC 61000-4-2 Level 2 requirements for robustness in factory automation and motor drive environments. |
| Output Sink Current | 21 mA minimum - drives standard LED indicators, relay coils, and logic-level MOSFET gates directly without external buffers. |
| Common-Mode Input Range | Includes ground to (VCC – 2 V) - allows direct sensing of 0 V referenced signals such as current-sense shunt voltages. |
Pinout & Package
LM2903QDRG4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm lead pitch. The package is RoHS-compliant and rated for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 Output | Open-collector output requiring external pull-up; sinks current when comparator 1 output is active low. |
| 1IN− | Comparator 1 Inverting Input | Negative reference input node; accepts signals down to ground with no level-shifting required. |
| 1IN+ | Comparator 1 Non-Inverting Input | Positive signal input; supports common-mode voltages up to VCC – 2 V. |
| GND | Ground Reference | System return path for both comparators and internal biasing; must be connected to PCB ground plane. |
| 2IN+ | Comparator 2 Non-Inverting Input | Independent positive input for second comparator; shares same voltage range and ESD protection as 1IN+. |
| 2IN− | Comparator 2 Inverting Input | Independent negative input for second comparator; fully isolated from comparator 1 inputs. |
| 2OUT | Comparator 2 Output | Open-collector output identical in function and drive strength to 1OUT; supports wired-OR logic configurations. |
| VCC | Positive Supply | Single supply input for both comparators; no separate VEE required; operates down to 2 V. |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in B-version replacement | Directly substitutes LM2903, LM2903V, and LM2903AV in existing SOIC-8 layouts without schematic or PCB changes. |
| Rail-to-rail input including ground | Enables direct sensing of 0 V referenced signals (e.g., shunt-based current monitoring) without input biasing networks. |
| 2 kV HBM ESD rating | Reduces need for external transient suppression in motor drive gate driver feedback paths and industrial I/O modules. |
| Low 3.5 nA input bias current | Minimizes error in high-impedance sensor interfaces such as thermistor or RTD voltage dividers. |
| 1 µs propagation delay | Supports real-time overvoltage/overcurrent response in server PSU protection and cordless tool battery management. |
Applications
| Overvoltage Protection Circuit | Battery Cell Monitoring System |
|---|---|
|
Use Scenario: Detects when input voltage exceeds safe threshold in DC-DC converter output stages. IC Role / Device Role / Timing Role: Dual comparator compares regulated output against precision reference; one channel triggers shutdown, the other enables status flag. Use Value: Enables fast (<1 µs) latch-off response before downstream components sustain damage, leveraging open-collector outputs for OR'ed fault signaling. |
Use Scenario: Monitors individual Li-ion cell voltages in multi-cell packs to prevent overcharge. IC Role / Device Role / Timing Role: Each comparator independently checks cell voltage against upper/lower thresholds; outputs drive charge/discharge FET control logic. Use Value: ±4 mV offset accuracy ensures reliable 4.20 V ±10 mV cutoff, while ground-referenced inputs eliminate need for level-shifting op-amps. |
| Industrial Sensor Interface Module | Motor Phase Detection Circuit |
|
Use Scenario: Converts analog sensor outputs (e.g., pressure, temperature) into digital logic levels for PLC input cards. IC Role / Device Role / Timing Role: Comparator 1 digitizes primary sensor signal; Comparator 2 validates signal integrity via window comparison. Use Value: 200 µA quiescent current enables always-on monitoring in battery-backed field devices; 36 V supply tolerance accommodates 24 V industrial bus rails. |
Use Scenario: Determines rotor position by comparing back-EMF zero-crossings in BLDC motor commutation. IC Role / Device Role / Timing Role: Two comparators process complementary phase signals; outputs feed microcontroller's capture timer inputs. Use Value: 1 µs propagation delay minimizes commutation timing error; ±38 V differential input range withstands motor voltage transients during switching. |
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 | Legacy A-version; ±15 mV max input offset, 1.3 µs propagation delay, 1 mA typical supply current. | Lower accuracy and slower response; suitable only where cost is prioritized over precision or speed. | Select LM2903DR only for legacy design refreshes where B-version qualification is not required. |
| TLV1702IDR | Rail-to-rail input/output, 36 V supply, 0.9 mV max offset, but push-pull output (no external pull-up needed). | Eliminates external pull-up resistors but requires redesign of output logic interface due to active-high capability. | Choose TLV1702IDR when board space is constrained and active-high outputs simplify system-level logic. |
Compared with LM2903DR and TLV1702IDR, the LM2903QDRG4 uniquely balances legacy compatibility, enhanced accuracy (±4 mV), and open-collector flexibility-making it optimal for upgrading existing LM2903-based protection circuits without layout changes while improving fault detection fidelity.
Availability
LM2903QDRG4 is available at Aetrix Electronics and suitable for industrial motor drives, server power supplies, and automotive battery management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LM2903QDRG4 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 decades of expertise in precision signal conditioning and power management ICs.
The LM2903QDRG4 belongs to TI's industry-standard dual comparator product line, engineered specifically for robust, cost-effective voltage comparison in harsh industrial and automotive environments where reliability and drop-in upgrade capability are critical.
FAQ
What is the maximum supply voltage rating for LM2903QDRG4?
The LM2903QDRG4 supports a maximum supply voltage of 36 V, with absolute maximum ratings extending to 38 V for short-duration transients. This allows direct integration into 24 V industrial systems and 36 V battery-powered equipment without external regulation, unlike older LM2903 variants limited to 32 V.
Does LM2903QDRG4 require dual power supplies?
No, the LM2903QDRG4 operates from a single supply ranging from 2 V to 36 V. Its inputs include ground in the common-mode range, and its open-collector outputs interface directly with TTL, MOS, or CMOS logic using only a pull-up resistor-eliminating the need for negative rails or level shifters in most applications.
How does LM2903QDRG4 differ from standard LM2903 in terms of temperature range?
The LM2903QDRG4 is specified for operation from –40°C to +125°C, matching the extended industrial temperature grade of the LM2903B family. Standard LM2903 variants (e.g., LM2903DR) are typically rated only to +85°C or +70°C, making the LM2903QDRG4 suitable for under-hood automotive and high-ambient industrial deployments.
Can LM2903QDRG4 replace LM2903 in existing SOIC-8 PCB footprints?
Yes, the LM2903QDRG4 uses the same SOIC-8 package (D package, 4.90 mm × 3.91 mm) and pinout as LM2903, LM2903V, and LM2903AV. It is explicitly documented as a drop-in B-version replacement, requiring no PCB or schematic modifications while delivering improved offset, speed, and ESD performance.
What is the typical input bias current of LM2903QDRG4 and why does it matter?
The LM2903QDRG4 has a typical input bias current of 3.5 nA, significantly lower than the 25 nA typical of legacy LM2903. This reduces voltage errors in high-impedance sensing networks-such as those used with thermistors or photodiodes-enabling higher accuracy without additional buffering stages.
LM2903QDRG4 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 @ 5V
- 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
LM2903QDRG4 FAQ
1.How can I place an order for LM2903QDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903QDRG4 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 LM2903QDRG4 reliable?
The price and inventory of LM2903QDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903QDRG4 is usually 5 days.
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LM2903QDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903QDRG4 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 LM2903QDRG4?
For technical support, including LM2903QDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903QDRG4 requirements.
6.How does Aetrix verify that LM2903QDRG4 is sourced from the original manufacturer or authorized distributors?
All LM2903QDRG4 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 LM2903QDRG4 meets industry standards.
7.What is the process for return or replacement of LM2903QDRG4?
All LM2903QDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2903QDRG4, 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 LM2903QDRG4 part is unused and in its original packaging.
Return procedure for LM2903QDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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