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Texas Instruments LM2903VQDR
- Part No.:
- LM2903VQDR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903VQDR.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,734
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Product details
Overview
LM2903VQDR 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, 1 µs propagation delay, and rail-to-rail input common-mode range including ground - widely deployed in server PSU overvoltage protection circuits.
For engineers reviewing the LM2903VQDR datasheet, LM2903VQDR pinout, LM2903VQDR application, or LM2903VQDR equivalent, this page delivers verified electrical specs, SOIC-8 package details, functional pin roles, real-world use cases in industrial power systems, and two validated alternative parts with precise technical and application-level distinctions.
Technical Context
The LM2903VQDR implements two independent open-collector comparators with internal ESD clamps enabling 2 kV HBM robustness. Its input stage supports differential voltages up to ±38 V and common-mode inputs down to ground, while output stages sink up to 21 mA and interface directly with TTL, MOS, and CMOS logic.
Designed as a drop-in replacement for legacy LM2903 and LM2903V variants, it maintains identical SOIC-8 pinout and thermal pad configuration but improves offset voltage (±4 mV max over temp), supply current (600 µA typ at 5 V), and temperature range (–40°C to +125°C) versus non-B versions.
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 power rails without level-shifting. |
| Input Offset Voltage (max) | ±4 mV over –40°C to +125°C - ensures reliable threshold detection in precision voltage monitoring applications. |
| Quiescent Current | 600 µA typical at 5 V - supports low-power always-on monitoring in battery-backed or energy-sensitive systems. |
| Propagation Delay | 1 µs typical (TTL input) - provides fast response for overvoltage/undervoltage fault detection in server PSUs. |
| Output Sink Current | 21 mA maximum - drives standard LED indicators, optocouplers, or logic-level MOSFET gates without external buffers. |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements and reduces susceptibility to assembly-line electrostatic damage. |
| Common-Mode Input Range | Includes ground and extends to VCC – 2 V - allows direct sensing of signals referenced to system ground or negative rails. |
Pinout & Package
LM2903VQDR is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm) with exposed thermal pad connected to GND. The device uses industry-standard pinout compatible with LM2903, LM2903V, and LM2903B variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector output requiring external pull-up; sinks current when IN+ < IN−. |
| 1IN− | Comparator 1 inverting input | Negative reference input; accepts signals from ground to VCC – 2 V. |
| 1IN+ | Comparator 1 non-inverting input | Positive signal input; supports same common-mode range as 1IN−. |
| GND | Ground reference | System ground connection and thermal pad anchor point. |
| 2IN+ | Comparator 2 non-inverting input | Independent positive input for second comparator channel. |
| 2IN− | Comparator 2 inverting input | Independent negative input; fully decoupled from comparator 1. |
| 2OUT | Comparator 2 output | Second open-collector output, electrically isolated from 1OUT. |
| VCC | Positive supply | Single supply input supporting up to 36 V; powers both comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range including ground | Enables direct sensing of 0 V-referenced signals (e.g., current-sense shunt outputs) without level-shifting circuitry. |
| 2 kV HBM ESD rating | Reduces risk of field failure during handling and board assembly in uncontrolled environments. |
| Drop-in replacement for LM2903/LM2903V | Preserves existing PCB layout and firmware logic while upgrading offset, speed, and temperature performance. |
| Low 600 µA quiescent current | Minimizes standby power draw in always-active monitoring functions such as brown-out detection. |
| ±38 V differential input capability | Allows safe comparison of high-side signals (e.g., 24 V bus vs. 24 V reference) without external attenuators. |
Applications
| Server Power Supply Monitoring | Industrial Motor Drive Protection |
|---|---|
|
Use Scenario: Real-time detection of overvoltage on +12 V and +5 V rails in redundant server PSUs. IC Role / Device Role / Timing Role: Dual comparator performing independent high/low threshold checks with <1 µs response to trigger shutdown logic. Use Value: Prevents downstream component damage by initiating immediate power-off within 1 µs of fault detection. |
Use Scenario: Monitoring phase current imbalance and DC bus overvoltage in 3-phase motor inverters. IC Role / Device Role / Timing Role: Comparator 1 detects overcurrent via shunt voltage; comparator 2 monitors bus voltage against safety threshold. Use Value: Enables simultaneous dual-fault detection using one SOIC-8 device, reducing BOM count and board space. |
| Factory Automation Sensor Interface | Building HVAC Control System |
|
Use Scenario: Converting analog 4–20 mA sensor outputs (e.g., pressure, temperature) into digital on/off signals for PLC inputs. IC Role / Device Role / Timing Role: Configured as window comparator to detect out-of-range conditions with hysteresis. Use Value: Eliminates need for external op-amps or ADCs in simple go/no-go sensor validation tasks. |
Use Scenario: Monitoring chilled water supply temperature and differential pressure across heat exchangers in commercial HVAC units. IC Role / Device Role / Timing Role: Dual comparator implementing high-temp alarm and low-flow interlock with independent thresholds. Use Value: Provides fail-safe mechanical control logic independent of microcontroller, enhancing system reliability. |
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; higher max input offset (±7 mV), wider temp range (–40°C to +125°C), no B-version ESD or speed improvements. | Acceptable where ±7 mV offset is sufficient and 1 µs response not required; lower cost in high-volume production. | Select LM2903DR only if design tolerates higher offset and slower response; verify thermal derating at full 36 V operation. |
| LM2903BQDR | Identical B-version spec (±0.37 mV offset, 1 µs delay, 2 kV HBM); differs only in automotive-grade qualification (AEC-Q100 Grade 1). | Required for automotive under-hood applications; unnecessary overhead for industrial/commercial use. | Choose LM2903BQDR only when AEC-Q100 compliance is mandated; LM2903VQDR offers identical electrical performance at lower cost. |
Compared with LM2903DR, LM2903VQDR delivers tighter offset and faster response at identical cost; compared with LM2903BQDR, it provides identical comparator performance without automotive qualification overhead, optimizing value for industrial power and automation designs.
Availability
LM2903VQDR is available at Aetrix Electronics and suitable for server PSU monitoring, industrial motor drive protection, and factory automation sensor interface requiring stable component supply and long-term industrial lifecycle support.
Supply support for LM2903VQDR 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 analog ICs and power management solutions.
The LM2903VQDR belongs to TI's industry-standard dual comparator family, engineered for robust, low-cost voltage comparison in industrial power supplies, motor controls, and automation systems operating across extended temperature ranges.
FAQ
What is the maximum supply voltage rating for LM2903VQDR?
The LM2903VQDR 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, provided thermal limits are observed per the RθJA = 148.5°C/W specification in SOIC-8 packaging.
Does LM2903VQDR support rail-to-rail input operation?
Yes, LM2903VQDR supports rail-to-rail input common-mode range including ground, with valid operation from V– (GND) up to VCC – 2 V. Either or both inputs may reach VCC without damage, though correct output behavior requires at least one input within the specified common-mode window - a key enabler for ground-referenced current sensing and high-side voltage monitoring.
Is LM2903VQDR pin-compatible with LM2903 and LM2903V?
Yes, LM2903VQDR uses the identical SOIC-8 pinout and thermal pad configuration as LM2903 and LM2903V, enabling drop-in replacement without PCB changes. It retains the same 1OUT/1IN−/1IN+/GND/VCC/2IN+/2IN−/2OUT ordering and GND-connected thermal pad placement defined in TI's LM2903 family documentation.
What is the typical propagation delay of LM2903VQDR?
The LM2903VQDR exhibits a typical propagation delay of 1 µs under TTL-level input conditions (VCC = 5 V, CL = 15 pF, RL = 5.1 kΩ). At higher overdrive levels (e.g., 100 mV), delay drops to ~300 ns; at minimal overdrive (5 mV), it remains ≤1 µs - making it suitable for sub-microsecond fault response in server PSU and motor drive protection circuits.
How does LM2903VQDR differ from LM2903BQDR?
LM2903VQDR and LM2903BQDR share identical electrical specifications (±0.37 mV offset, 1 µs delay, 2 kV HBM), but LM2903BQDR is qualified to AEC-Q100 Grade 1 for automotive use, while LM2903VQDR is rated for industrial applications (–40°C to +125°C). The "V" suffix denotes enhanced voltage rating (32 V max) versus standard LM2903 (30 V), though both support 36 V operation per B-version specs.
LM2903VQDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 7mV @ 32V
- 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
LM2903VQDR FAQ
1.How can I place an order for LM2903VQDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903VQDR 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 LM2903VQDR reliable?
The price and inventory of LM2903VQDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903VQDR is usually 5 days.
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4.How is shipping managed for LM2903VQDR?
LM2903VQDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903VQDR 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 LM2903VQDR?
For technical support, including LM2903VQDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903VQDR requirements.
6.How does Aetrix verify that LM2903VQDR is sourced from the original manufacturer or authorized distributors?
All LM2903VQDR 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 LM2903VQDR meets industry standards.
7.What is the process for return or replacement of LM2903VQDR?
All LM2903VQDR units undergo pre-shipment inspection (PSI). If there is an issue with LM2903VQDR, 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 LM2903VQDR part is unused and in its original packaging.
Return procedure for LM2903VQDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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