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Texas Instruments LM2903N/NOPB
- Part No.:
- LM2903N/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2903N/NOPB.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,284
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Product details
Overview
LM2903N/NOPB from Texas Instruments is a dual, low-power, low-offset voltage comparator IC designed for single- or dual-supply operation across 2.0 V to 36 V. It features ±3 mV max input offset voltage, 0.4 mA supply current at 5 V, 25 nA input bias current, and rail-to-rail input common-mode range including ground - enabling precision threshold detection in battery-powered industrial sensors and power supply monitoring circuits.
For engineers reviewing the LM2903N/NOPB datasheet, LM2903N/NOPB pinout, LM2903N/NOPB application, or LM2903N/NOPB equivalent, key selection considerations include open-collector output compatibility with TTL/CMOS logic, wide supply flexibility, ground-sensing capability, and verified performance over −40°C to +85°C operating junction temperature.
Technical Context
The LM2903N/NOPB integrates two independent comparators with PNP input stages, delivering stable operation without dual supplies while supporting input voltages down to ground. Its open-collector NPN output stage sinks up to 16 mA and achieves 250 mV saturation voltage at 4 mA load.
Input common-mode range extends from 0 V to (V+ − 1.5 V) at 25°C, and differential input voltage tolerance reaches ±36 V - allowing robust interfacing with high-side sensing nodes and noisy industrial signal sources without external clamping under normal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 36 V single supply; ±1.0 V to ±18 V dual supply - supports direct integration into 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting. |
| Input Offset Voltage | ±3 mV max - enables accurate threshold detection within ±0.1% of full-scale at 3 V reference, critical for battery voltage monitoring. |
| Supply Current | 0.4 mA typical at 5 V - ensures <1 mW quiescent power at 3.3 V, suitable for always-on sensor nodes. |
| Input Bias Current | 25 nA max - permits use with high-impedance sources (e.g., thermistors, photodiodes) without significant voltage error. |
| Output Saturation Voltage | 250 mV at 4 mA - guarantees reliable low-state logic assertion when driving 5 V TTL or 3.3 V CMOS with pull-up resistors ≥10 kΩ. |
| Input Common-Mode Range | Includes ground (0 V) - allows direct comparison of signals referenced to system ground, eliminating need for level-shifting in single-supply designs. |
| Operating Temperature | −40°C to +85°C junction - qualified for industrial control, automotive body electronics, and outdoor equipment environments. |
Pinout & Package
LM2903N/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm), compatible with standard surface-mount assembly processes and IPC-7351 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (Pin 1) | Open-collector output, Channel A | Sinks current to ground; requires external pull-up resistor to define HIGH logic level - enables wired-OR logic and mixed-voltage interfacing. |
| –INA (Pin 2) | Inverting input, Channel A | Accepts reference or feedback signal; input bias current flows out of pin - must be driven by low-impedance source or buffered for precision. |
| +INA (Pin 3) | Non-inverting input, Channel A | Accepts sensed signal; same bias behavior as –INA - used for active-high threshold detection when –INA is fixed. |
| GND (Pin 4) | Ground reference | Common return for both comparators and internal bias network - must be low-impedance connection to minimize noise coupling. |
| +INB (Pin 5) | Non-inverting input, Channel B | Independent input for second comparator; identical electrical characteristics to +INA - supports dual-threshold or window detection. |
| –INB (Pin 6) | Inverting input, Channel B | Independent reference input for second comparator - enables simultaneous monitoring of upper/lower limits in safety-critical systems. |
| OUTB (Pin 7) | Open-collector output, Channel B | Electrically isolated from OUTA - allows independent logic-level translation or separate load switching per channel. |
| V+ (Pin 8) | Positive supply | Power rail for both comparators; supplies internal bias and output stage - accepts 2.0–36 V, enabling direct connection to unregulated battery or bus rails. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-sensing capability | Enables direct comparison of 0–V+ signals without negative rail - eliminates charge pump or split-supply design overhead in portable instruments. |
| Low 0.4 mA supply current | Reduces standby power by >90% vs. legacy comparators - extends battery life in smoke detectors and remote telemetry nodes beyond 5 years. |
| 25 nA input bias current | Minimizes voltage drop across 1 MΩ sensor networks - preserves accuracy in high-resistance RTD or pH probe interfaces. |
| ±36 V differential input tolerance | Permits direct connection to motor phase voltages or AC line-derived signals without external attenuation - simplifies overvoltage protection in motor drives. |
| TTL/CMOS-compatible open-collector outputs | Supports flexible logic-level translation via pull-up to 1.8 V, 3.3 V, or 5 V - enables seamless integration into mixed-voltage FPGA or microcontroller I/O subsystems. |
Applications
| Battery Voltage Monitor | Industrial Overvoltage Protector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2 V and warning at 3.0 V. IC Role / Device Role / Timing Role: Dual comparator configured as window detector with hysteresis - Channel A monitors upper limit, Channel B monitors lower limit. Use Value: Achieves ±15 mV total error margin (including offset drift) across −20°C to +60°C, ensuring safe charge termination without premature cutoff. | Use Scenario: Detecting 24 V DC bus overvoltage (>28 V) in PLC I/O modules to disable downstream loads before damage occurs. IC Role / Device Role / Timing Role: Single comparator comparing scaled bus voltage against precision 2.5 V reference - output drives optocoupler input. Use Value: Input common-mode range includes ground allows direct resistive divider from 24 V rail without level-shifting, reducing BOM count by one active component. |
| Zero-Crossing Detector | Temperature Threshold Alarm |
Use Scenario: Generating clean 50/60 Hz timing pulses from AC mains for solid-state relay synchronization in HVAC controls. IC Role / Device Role / Timing Role: Comparator with AC-coupled input and hysteresis - converts sine wave to square wave with <1 μs propagation delay variation. Use Value: Low input offset voltage minimizes timing jitter (<0.5° phase error at 60 Hz), improving power factor correction accuracy. | Use Scenario: Triggering fan activation when heatsink temperature exceeds 70°C in industrial power supplies using NTC thermistor divider. IC Role / Device Role / Timing Role: Single comparator comparing thermistor voltage against fixed reference - output drives MOSFET gate directly. Use Value: 25 nA input bias current prevents self-heating error in 100 kΩ NTC networks, maintaining ±0.3°C measurement fidelity. |
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 |
|---|---|---|---|
| LM393DR | Same core architecture and pinout; ±2 mV max offset voltage (tighter spec), but rated only for 0°C to +70°C ambient. | Not qualified for extended temperature industrial use; limited to commercial-grade consumer or office equipment. | Select LM393DR only if operating environment stays within 0–70°C and tighter offset is required for sub-10 mV threshold accuracy. |
| TLV3702IDR | Rail-to-rail input/output, 65 μA supply current, 1.5 mV offset - but requires minimum 2.7 V supply and lacks ground-sensing capability. | Cannot interface directly with 0 V referenced signals; unsuitable for battery monitor low-threshold detection below 2.7 V. | Choose TLV3702IDR when ultra-low power (<100 μA) and rail-to-rail output swing are mandatory, and supply ≥2.7 V is guaranteed. |
Compared with LM393DR and TLV3702IDR, LM2903N/NOPB uniquely balances wide supply range (2.0–36 V), ground-sensing inputs, industrial temperature rating (−40°C to +85°C), and proven reliability in safety-critical power monitoring - making it the default choice for ruggedized embedded systems where supply uncertainty and environmental stress are design constraints.
Availability
LM2903N/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial power supply supervision, and automotive body control modules requiring stable component supply across long production lifecycles.
Supply support for LM2903N/NOPB 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 industrial-grade components.
The LM2903N/NOPB belongs to TI's legacy precision comparator product line, engineered specifically for cost-sensitive, high-reliability applications demanding wide supply range, ground-referenced inputs, and open-collector logic interfacing in harsh environments.
FAQ
What is the maximum supply voltage for LM2903N/NOPB?
The LM2903N/NOPB supports a maximum supply voltage of 36 V on the V+ pin under recommended operating conditions. Absolute maximum rating for differential input voltage is also 36 V, and input pins tolerate voltages up to 36 V regardless of V+ level - enabling direct connection to 24 V industrial buses or unregulated battery packs without external protection diodes in most cases.
Does LM2903N/NOPB require dual supplies to operate?
No, LM2903N/NOPB is fully functional with a single supply ranging from 2.0 V to 36 V. Its input common-mode voltage range includes ground (0 V), allowing both inputs to operate down to 0 V even with only a positive rail - eliminating the need for negative supplies in most sensing and monitoring applications.
Can LM2903N/NOPB drive TTL and CMOS logic directly?
Yes, LM2903N/NOPB outputs are open-collector NPN transistors compatible with TTL, DTL, ECL, MOS, and CMOS logic families. When paired with an appropriate pull-up resistor to the target logic supply (e.g., 3.3 V or 5 V), it delivers valid HIGH/LOW levels meeting standard logic thresholds - confirmed in TI's official characterization data across all supported supply voltages.
What is the input bias current specification for LM2903N/NOPB?
The LM2903N/NOPB has a maximum input bias current of 25 nA at 25°C, with typical values around 25 nA. This low bias current enables accurate interfacing with high-impedance sources such as thermistors, photodiodes, or RC timing networks without introducing significant measurement error or loading effects.
Is LM2903N/NOPB pin-compatible with other dual comparators in the LMx93 family?
Yes, LM2903N/NOPB shares identical 8-pin SOIC pinout and electrical behavior with LM393, LM293, and LM193 variants - including matching pin functions (OUTA, –INA, +INA, GND, +INB, –INB, OUTB, V+). This allows direct substitution in existing designs where temperature range or offset specifications align with the application requirements.
LM2903N/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- 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 @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 700ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
LM2903N/NOPB FAQ
1.How can I place an order for LM2903N/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903N/NOPB 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 LM2903N/NOPB reliable?
The price and inventory of LM2903N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903N/NOPB is usually 5 days.
3.What payment methods are accepted for LM2903N/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903N/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903N/NOPB?
LM2903N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903N/NOPB 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 LM2903N/NOPB?
For technical support, including LM2903N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903N/NOPB requirements.
6.How does Aetrix verify that LM2903N/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2903N/NOPB 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 LM2903N/NOPB meets industry standards.
7.What is the process for return or replacement of LM2903N/NOPB?
All LM2903N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2903N/NOPB, 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 LM2903N/NOPB part is unused and in its original packaging.
Return procedure for LM2903N/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903N/NOPB Tags
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