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Texas Instruments LM2903QDG4
- Part No.:
- LM2903QDG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903QDG4.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,521
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Product details
Overview
LM2903QDG4 from Texas Instruments is a dual precision comparator IC designed for industrial and automotive voltage monitoring, level detection, and window-comparator applications. It features ±0.37 mV typical input offset voltage, 200 µA per comparator supply current, 1 µs propagation delay, rail-to-rail input common-mode range including ground, and operation up to 36 V supply. It is widely used in server power supplies and motor drive fault detection circuits.
For engineers reviewing the LM2903QDG4 datasheet, LM2903QDG4 pinout, LM2903QDG4 application, or LM2903QDG4 equivalent, key selection criteria include its extended temperature range (–40°C to +125°C), B-version ESD robustness (2 kV HBM), open-collector output compatibility with TTL/MOS/CMOS, and drop-in replacement capability for legacy LM2903 variants without layout changes.
Technical Context
The LM2903QDG4 implements two independent voltage comparators on a single silicon die, each with dedicated ESD clamps enabling 2 kV HBM tolerance. Its input stage supports common-mode voltages from –0.1 V to (VCC – 2 V), allowing direct sensing at ground-referenced nodes. The output stage uses open-collector NPN transistors capable of sinking up to 21 mA per channel.
Designed for single-supply operation from 2 V to 36 V, quiescent current remains stable across voltage and temperature (400–800 µA total). Propagation delay is specified at 1 µs under 5 mV overdrive with 15 pF load, and differential input voltage withstand is rated to ±38 V - exceeding supply rails.
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 systems without regulation |
| Input Offset Voltage (max) | ±4 mV over –40°C to +125°C - ensures accurate threshold detection in wide-temperature environments |
| Quiescent Current | 600 µA typical at 5 V - supports low-power always-on monitoring in battery-backed or energy-sensitive designs |
| Propagation Delay | 1 µs typical at 5 V with 5 mV overdrive - suitable for fast-response fault detection in motor drives and UPS |
| Input Bias Current | 3.5 nA typical - minimizes loading error when interfacing high-impedance sensors or divider networks |
| Output Sink Current | 21 mA per channel - drives standard LEDs, relays, or logic-level inputs without external buffers |
| ESD Rating (HBM) | 2000 V - meets IEC 61000-4-2 Level 2 requirements for board-level robustness |
Pinout & Package
LM2903QDG4 is packaged in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. Pin 1 is 1OUT; pin 2 is 1IN−; pin 3 is 1IN+; pin 4 is GND; pin 5 is 2IN+; pin 6 is 2IN−; pin 7 is 2OUT; pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector NPN - requires external pull-up to define logic HIGH; sinks current when active |
| 1IN− | Inverting input (Comp 1) | Differential input node - referenced against 1IN+; accepts voltages down to –0.1 V |
| 1IN+ | Non-inverting input (Comp 1) | Differential input node - supports common-mode range up to VCC – 2 V |
| GND | Ground reference | Power and signal return path - must be low-impedance for stable comparator operation |
| 2IN+ | Non-inverting input (Comp 2) | Independent input for second comparator - identical electrical specs to 1IN+ |
| 2IN− | Inverting input (Comp 2) | Independent input for second comparator - identical electrical specs to 1IN− |
| 2OUT | Comparator 2 output | Open-collector NPN - electrically isolated from 1OUT; shares no internal connection |
| VCC | Positive supply | Single supply input - powers both comparators; no negative rail required |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC – 2 V - enables direct interface with 0 V referenced sensors and high-side signals |
| Low input offset voltage | ±0.37 mV typical - reduces false triggering in precision threshold detection (e.g., battery undervoltage lockout) |
| Fast 1 µs response time | With 5 mV overdrive - supports real-time fault detection in motor control and power conversion feedback loops |
| 2 kV HBM ESD protection | Integrated clamps on all pins - eliminates need for external TVS diodes in many industrial PCB layouts |
| Drop-in replacement for LM2903 | Pin-compatible and functionally identical to legacy LM2903, LM2903V, and LM2903AV - no redesign required |
Applications
| Vacuum Robot Motion Control | Server Power Supply Monitoring |
|---|---|
Use Scenario: Detecting motor stall or encoder failure during vacuum gripper actuation sequences. IC Role / Device Role / Timing Role: Dual comparator monitors back-EMF and current-sense voltage simultaneously to trigger immediate shutdown. Use Value: 1 µs response time prevents mechanical damage; rail-to-rail inputs capture zero-crossing events without level-shifting circuitry. | Use Scenario: Validating +12 V, +5 V, and +3.3 V rails during power-up and fault conditions in redundant PSU modules. IC Role / Device Role / Timing Role: Configured as window comparator for each rail using resistor dividers and internal dual channels. Use Value: ±4 mV max offset ensures <±1% threshold accuracy at 12 V; 36 V rating allows direct sensing without attenuation. |
| Cordless Power Tool Battery Management | Industrial Motor Drive Fault Detection |
Use Scenario: Real-time cell voltage balancing and over-discharge protection in 18 V Li-ion packs. IC Role / Device Role / Timing Role: One comparator monitors pack voltage vs. under-voltage threshold; second monitors individual cell delta-V. Use Value: 200 µA total supply current extends runtime in always-on protection circuits; –40°C to +125°C rating covers tool operating extremes. | Use Scenario: Monitoring IGBT gate-emitter voltage and DC bus overvoltage in 3-phase inverters. IC Role / Device Role / Timing Role: Comparator 1 detects desaturation (VGE collapse); comparator 2 triggers overvoltage shutdown. Use Value: ±38 V differential input rating permits direct high-side sensing; open-collector outputs interface directly with optocouplers. |
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 only to +105°C ambient (not automotive-grade) | Lacks AEC-Q100 qualification; unsuitable for under-hood automotive use | Select LM2903QDG4 for automotive or extended-temperature industrial deployments where reliability beyond 105°C is required |
| LM2903BQDR | B-version with same 2 kV HBM, ±0.37 mV offset, and –40°C to +125°C range; differs only in part marking and tape-and-reel packaging | No functional difference - identical die and performance; QDG4 and QDR are orderable variants of LM2903B | LM2903QDG4 and LM2903BQDR are interchangeable; choose based on distributor stock and reel size requirements |
Compared with LM2903DR, LM2903QDG4 provides guaranteed operation to +125°C and AEC-Q100 alignment; versus LM2903BQDR, it offers identical performance with minor packaging differentiation - making LM2903QDG4 optimal for high-reliability industrial control and automotive subsystems requiring long-term thermal stability.
Availability
LM2903QDG4 is available at Aetrix Electronics and suitable for server power supply monitoring, industrial motor drive fault detection, and cordless power tool battery management requiring stable component supply across extended temperature ranges and automotive-grade reliability.
Supply support for LM2903QDG4 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 personal electronics markets.
The LM2903 product line delivers precision dual comparators optimized for rugged, wide-supply industrial and automotive applications - emphasizing thermal stability, ESD resilience, and drop-in legacy compatibility.
FAQ
What is the maximum supply voltage rating for LM2903QDG4?
The LM2903QDG4 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 regulators or voltage dividers, maintaining full functionality across its entire operating range.
Does LM2903QDG4 require a negative supply rail?
No, LM2903QDG4 operates from a single positive supply rail (2 V to 36 V) with inputs that accept common-mode voltages down to –0.1 V relative to ground. Its rail-to-rail input capability eliminates the need for dual supplies or level-shifting circuitry when monitoring ground-referenced signals such as current-sense resistors or battery terminals.
Can LM2903QDG4 replace older LM2903 variants on existing PCBs?
Yes, LM2903QDG4 is a pin-compatible and functionally identical drop-in replacement for LM2903, LM2903V, and LM2903AV in SOIC-8 packages. No PCB modifications, schematic updates, or firmware changes are needed - it delivers improved offset voltage, faster response, and enhanced ESD protection while maintaining full backward compatibility.
What is the output configuration of LM2903QDG4?
LM2903QDG4 features two independent open-collector NPN outputs (1OUT and 2OUT), each capable of sinking up to 21 mA. These outputs require external pull-up resistors to define HIGH logic levels and can interface directly with TTL, MOS, CMOS, optocouplers, or relay drivers - offering flexible interfacing without additional buffer stages.
Is LM2903QDG4 qualified for automotive applications?
Yes, LM2903QDG4 is manufactured under automotive-grade process controls and specified for operation from –40°C to +125°C. While not formally AEC-Q100 certified in this specific variant, its parametric performance, test coverage, and qualification pedigree align with automotive subsystem requirements for body electronics, battery management, and motor control modules.
LM2903QDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- 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
LM2903QDG4 FAQ
1.How can I place an order for LM2903QDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903QDG4 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 LM2903QDG4 reliable?
The price and inventory of LM2903QDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903QDG4 is usually 5 days.
3.What payment methods are accepted for LM2903QDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903QDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903QDG4?
LM2903QDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903QDG4 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 LM2903QDG4?
For technical support, including LM2903QDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903QDG4 requirements.
6.How does Aetrix verify that LM2903QDG4 is sourced from the original manufacturer or authorized distributors?
All LM2903QDG4 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 LM2903QDG4 meets industry standards.
7.What is the process for return or replacement of LM2903QDG4?
All LM2903QDG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2903QDG4, 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 LM2903QDG4 part is unused and in its original packaging.
Return procedure for LM2903QDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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