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Texas Instruments LM2903QDR
- Part No.:
- LM2903QDR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903QDR.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,823
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Product details
Overview
LM2903QDR 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 used in motor drive feedback, server PSU overvoltage detection, and industrial sensor thresholding.
For engineers reviewing the LM2903QDR datasheet, LM2903QDR pinout, LM2903QDR application, or LM2903QDR equivalent, key selection criteria include its rail-to-rail input capability (common-mode range includes ground), open-collector outputs compatible with TTL/MOS/CMOS, and B-version enhancements over legacy LM2903 including improved ESD (2 kV HBM) and extended supply voltage (up to 36 V).
Technical Context
The LM2903QDR implements two independent comparators with internal ESD clamps enabling robust input ruggedness. Its input stage supports common-mode voltages down to ground and up to VCC – 2 V, while differential input voltage tolerance reaches ±38 V - exceeding supply rails.
Output stage uses open-collector NPN transistors, requiring external pull-up resistors. Propagation delay is specified at 1 µs (typical) under 5 V supply, 15 pF load, and 100 mV input step with 5 mV overdrive - optimized for fast response in power monitoring and fault-detection circuits.
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 server power rails without level-shifting. |
| Input Offset Voltage (max) | ±4 mV over –40°C to +125°C - ensures accurate threshold detection in temperature-variable environments like motor drives. |
| Quiescent Current | 600 µA (typ) at 5 V - supports low-power battery-backed or always-on monitoring applications. |
| Propagation Delay | 1 µs (typ) - provides timely response for overcurrent/overvoltage protection in switching power supplies. |
| Input Bias Current (max) | 25 nA at –40°C to +125°C - minimizes error in high-impedance sensor interfaces (e.g., thermistor or RTD bridges). |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional input protection circuitry. |
| Output Type | Open-collector - allows wired-OR logic, flexible voltage-level translation via external pull-up, and direct interface to microcontroller GPIOs. |
Pinout & Package
LM2903QDR is packaged in an 8-pin SOIC (D) package with body size 4.90 mm × 3.91 mm and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector NPN - must be pulled up externally; sinks current when active low. |
| 1IN− | Inverting input of Comp 1 | Differential input node - accepts signals down to ground; tolerant of inputs up to VCC. |
| 1IN+ | Non-inverting input of Comp 1 | Differential input node - same voltage range and ruggedness as 1IN−. |
| GND | Ground reference | Common return path for both comparators and internal bias networks. |
| 2IN+ | Non-inverting input of Comp 2 | Independent input - no crosstalk; identical specs to Comp 1 inputs. |
| 2IN− | Inverting input of Comp 2 | Independent input - supports separate threshold comparisons on same die. |
| 2OUT | Comparator 2 output | Open-collector NPN - electrically isolated from 1OUT; enables dual independent logic decisions. |
| VCC | Positive supply | Single supply pin - powers both comparators; no split or negative rail required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC – 2 V - eliminates need for input biasing in single-supply sensor interfaces. |
| Low input offset voltage | ±0.37 mV typical - improves accuracy in precision window comparators and battery voltage monitors. |
| Fast propagation delay | 1 µs typical - enables real-time fault detection in motor control and UPS systems. |
| High ESD robustness | 2 kV HBM rating - reduces field failure risk during PCB assembly and system integration. |
| Wide temperature operation | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom infrastructure use. |
Applications
| Motor Drive Protection | Server PSU Monitoring |
|---|---|
Use Scenario: Detecting overcurrent or phase loss in BLDC motor controllers using shunt voltage or back-EMF sensing. IC Role / Device Role / Timing Role: Dual comparator performs simultaneous high-side and low-side current threshold comparison with sub-microsecond response. Use Value: Enables cycle-by-cycle shutdown before IGBT damage occurs, leveraging 1 µs delay and rail-to-rail input compatibility with shunt amplifiers. | Use Scenario: Monitoring +12 V and +5 V rails in redundant server power supplies for undervoltage lockout and overvoltage shutdown. IC Role / Device Role / Timing Role: One comparator supervises each rail independently; open-collector outputs feed OR'd fault bus to system manager MCU. Use Value: Achieves <10 µs total fault-to-action latency with minimal external components, meeting ATX and OCP compliance timing budgets. |
| Industrial Sensor Interface | Factory Automation Thresholding |
Use Scenario: Converting analog outputs from pressure, temperature, or proximity sensors into digital logic levels for PLC input modules. IC Role / Device Role / Timing Role: Comparator acts as analog-to-digital front-end with programmable hysteresis; inputs directly accept 0–10 V or 4–20 mA loop signals. Use Value: Eliminates need for external op-amps or ADCs in simple go/no-go sensing, reducing BOM cost and board space by >30%. | Use Scenario: Detecting presence/absence of parts on conveyor lines using photoelectric or inductive sensors with variable ambient noise. IC Role / Device Role / Timing Role: Dual comparator configures window comparator for noise-immune signal validation; one channel sets upper limit, the other lower limit. Use Value: Provides 20 mV hysteresis margin without external resistors, rejecting EMI-induced false triggers in electrically noisy factory floors. |
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 and pinout; A-grade with ±7 mV max offset (vs. ±4 mV for QDR); rated –40°C to +125°C but lacks B-version ESD (2 kV vs. 2 kV - same spec, but QDR is production-qualified B-version). | Acceptable where tighter offset not required; may need additional input protection in high-ESD environments. | Select LM2903DR only if cost sensitivity outweighs need for guaranteed B-version performance consistency and long-term supply stability. |
| TLV1702IDR | Higher precision (±0.75 mV max offset), rail-to-rail input/output, but requires dual supply or level-shifting for single-supply use; 1.8–36 V supply range. | Not drop-in: output not open-collector; incompatible with wired-OR or mixed-voltage logic without redesign. | Choose TLV1702IDR only when ultra-low offset and rail-to-rail output swing are mandatory, and board layout can accommodate different output architecture. |
Compared with LM2903DR and TLV1702IDR, LM2903QDR delivers optimal balance of precision, ruggedness, and drop-in compatibility in industrial and server power applications - maintaining open-collector flexibility while guaranteeing B-version electrical specs and temperature grading.
Availability
LM2903QDR is available at Aetrix Electronics and suitable for motor drive protection, server PSU monitoring, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and consistent B-version performance across production batches.
Supply support for LM2903QDR 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, embedded processing, and connectivity technologies, with decades of leadership in precision analog ICs and industrial-grade components.
The LM2903QDR belongs to TI's industry-standard dual comparator product line, engineered for reliability in harsh environments - targeting power management, factory automation, and automotive subsystems where robustness and long-term availability are critical.
FAQ
What is the maximum supply voltage for LM2903QDR?
The LM2903QDR supports a maximum supply voltage of 36 V, verified per Absolute Maximum Ratings in the official datasheet (SLCS005AH). This exceeds legacy LM2903 versions (32 V max) and enables direct integration into 24 V industrial and 36 V telecom power systems without derating or external regulation.
Does LM2903QDR have rail-to-rail input capability?
Yes, LM2903QDR features rail-to-rail input common-mode range that includes ground and extends to VCC – 2 V. This is confirmed in Section 5.2 Recommended Operating Conditions and Electrical Characteristics tables for LM2903B, allowing direct interfacing with sensors and DACs operating near ground potential without input biasing networks.
What is the typical propagation delay of LM2903QDR?
The LM2903QDR has a typical propagation delay of 1 µs under standard test conditions (VS = 5 V, CL = 15 pF, RL = 5.1 kΩ, 100 mV input step with 5 mV overdrive), as specified in Section 5.7 Switching Characteristics. This value holds across the full –40°C to +125°C operating range per characterization data.
Is LM2903QDR pin-compatible with older LM2903 variants?
Yes, LM2903QDR is a B-version device in SOIC-8 (D) package and is explicitly documented as a drop-in replacement for LM2903, LM2903V, and LM2903AV - sharing identical pinout, footprint, and connection topology per Figure 4-1 and Family Comparison Table in SLCS005AH.
What output configuration does LM2903QDR use?
LM2903QDR uses open-collector NPN outputs on both comparators, requiring external pull-up resistors. This configuration is confirmed in Pin Functions (Table 4-1), Electrical Characteristics (VOL and IOL parameters), and Functional Block Diagram (Section 6.2), enabling wired-OR logic and voltage-level translation across mixed-signal systems.
LM2903QDR 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
LM2903QDR FAQ
1.How can I place an order for LM2903QDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903QDR 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 LM2903QDR reliable?
The price and inventory of LM2903QDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903QDR is usually 5 days.
3.What payment methods are accepted for LM2903QDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903QDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903QDR?
LM2903QDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903QDR 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 LM2903QDR?
For technical support, including LM2903QDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903QDR requirements.
6.How does Aetrix verify that LM2903QDR is sourced from the original manufacturer or authorized distributors?
All LM2903QDR 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 LM2903QDR meets industry standards.
7.What is the process for return or replacement of LM2903QDR?
All LM2903QDR units undergo pre-shipment inspection (PSI). If there is an issue with LM2903QDR, 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 LM2903QDR part is unused and in its original packaging.
Return procedure for LM2903QDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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