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Texas Instruments LM2903N
- Part No.:
- LM2903N
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2903N.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
LM2903N 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, and rail-to-rail input common-mode range including ground - enabling precise threshold detection in battery-powered and industrial sensing systems.
For engineers reviewing the LM2903N datasheet, LM2903N pinout, LM2903N application, or LM2903N equivalent, key selection considerations include its open-collector outputs compatible with TTL/CMOS logic, 25 nA input bias current for high-impedance signal sources, and guaranteed operation from −40°C to +85°C junction temperature.
Technical Context
The LM2903N integrates two independent comparators with PNP input stages, enabling input voltages down to ground on single supplies and differential input ranges equal to the full supply voltage (up to ±18 V dual or 36 V single). Its output stage uses grounded-emitter NPN transistors with open-collector configuration, supporting wired-OR logic and flexible pull-up voltage selection up to 36 V.
It operates without dual supplies: the GND pin serves as the negative reference, and inputs function correctly even when one input is at 0 V while the other exceeds V+. Input clamping diodes protect against −0.3 V excursions, and output saturation remains ≤400 mV at 4 mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 36 V single supply or ±1.0 V to ±18 V dual supply - supports wide-input industrial and automotive rails without level-shifting. |
| Input Offset Voltage | ±2.0 mV (max) at 25°C - enables accurate 10-mV-level threshold detection in precision monitoring circuits. |
| Supply Current | 0.4 mA typical at 5 V - allows continuous operation in battery-powered devices for months on coin cells. |
| Input Bias Current | 25 nA (typical) - permits direct interfacing with high-impedance sensors (e.g., thermistors, photodiodes) without loading error. |
| Output Sink Current | 6.0 mA minimum at VO ≤ 1.5 V - drives standard LED indicators or TTL inputs without external buffers. |
| Input Common-Mode Range | 0 V to (V+ − 1.5 V) - allows ground-referenced sensing (e.g., current shunt monitoring) on single supplies. |
| Response Time | 1.5 μs (typical) for 100 mV step - sufficient for motor overcurrent trip, power-good sequencing, and slow analog-to-digital conversion. |
Pinout & Package
LM2903N is packaged in an 8-pin SOIC (P and D package), 4.90 mm × 3.91 mm body size, with industry-standard pinout and thermal performance (RθJA = 170°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (Pin 1) | Open-collector output, Channel A | Sinks current to GND; requires external pull-up to logic-compatible voltage (TTL/CMOS/MOS); enables wired-OR bus configurations. |
| –INA (Pin 2) | Inverting input, Channel A | Accepts reference or threshold voltage; input bias current flows *out* of pin due to PNP stage - critical for high-Z divider design. |
| +INA (Pin 3) | Non-inverting input, Channel A | Accepts sensed signal; common-mode range includes 0 V - enables direct connection to shunt resistors or sensor grounds. |
| GND (Pin 4) | Ground reference / negative supply | Serves as return path for both channels and output sinks; must be low-impedance for stable comparator switching. |
| +INB (Pin 5) | Non-inverting input, Channel B | Independent second channel input; identical electrical characteristics to +INA - supports dual-threshold or window detection. |
| –INB (Pin 6) | Inverting input, Channel B | Independent second channel reference input; shares same bias and offset specs - enables matched dual-comparator designs. |
| OUTB (Pin 7) | Open-collector output, Channel B | Electrically isolated from OUTA; supports independent logic loads or parallel sinking into shared pull-up resistor. |
| V+ (Pin 8) | Positive supply | Supplies both comparators; supply current independent of V+ magnitude - simplifies multi-rail system power budgeting. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-sensing capability | Input common-mode range includes 0 V - eliminates need for negative supply in shunt-based current monitoring. |
| Low quiescent current | 0.4 mA at 5 V - reduces standby power in always-on battery systems (e.g., smoke detectors, remote sensors). |
| Logic-compatible open-collector outputs | Output sinks up to 16 mA and interfaces directly with TTL, CMOS, ECL, and MOS - no level translators required. |
| Wide input differential voltage range | Up to 36 V - allows inputs to exceed V+ safely (e.g., detecting overvoltage on 24-V bus with 5-V logic supply). |
| Low input offset drift | ±3 mV max over temperature - maintains accuracy across −40°C to +85°C without calibration in industrial controls. |
Applications
| Battery Voltage Monitor | Industrial Overcurrent Protection |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff at 4.2 V (full) and 2.8 V (low). IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel compares against upper threshold, the other against lower threshold. Use Value: Enables precise, low-power state-of-charge indication using only two resistive dividers and no microcontroller intervention. |
Use Scenario: Detecting excessive current in a 24-V DC motor drive by measuring voltage across a 10-mΩ shunt resistor. IC Role / Device Role / Timing Role: Single comparator comparing shunt voltage to 100-mV reference - triggers shutdown when current exceeds 10 A. Use Value: Provides sub-100-μs response to overcurrent events while operating from same 24-V rail, eliminating auxiliary supply. |
| Power Supply Sequencing | Zero-Crossing Detection (AC Mains) |
|
Use Scenario: Ensuring correct startup order of multiple voltage rails (e.g., 12 V before 3.3 V) in FPGA or ASIC power systems. IC Role / Device Role / Timing Role: Comparator monitors each rail with dedicated reference; outputs enable/disable enable pins of downstream regulators via logic gates. Use Value: Prevents latch-up or damage from improper bias sequencing using discrete, fail-safe analog control - no firmware dependency. |
Use Scenario: Generating clean timing edges from 50/60 Hz AC mains for phase-controlled dimmers or energy meters. IC Role / Device Role / Timing Role: Comparator with hysteresis detects zero-crossing of rectified AC waveform referenced to GND. Use Value: Delivers jitter-free digital timing signals with <1.5 μs propagation delay - suitable for TRIAC gate triggering without software compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Same core architecture and pinout; rated for 0°C to +70°C ambient (vs. LM2903N's −40°C to +85°C). | Not qualified for extended temperature industrial or automotive under-hood use. | Select LM393DR only for commercial-grade cost-sensitive applications where ambient stays within 0–70°C. |
| TLV3702IDR | Rail-to-rail input/output, 850 nA supply current, 1.5 mV offset - higher precision but higher cost and different pinout. | Requires PCB redesign; suited for low-voltage (1.8–5.5 V) battery systems needing tighter thresholds. | Choose TLV3702IDR when offset <1.5 mV and rail-to-rail operation are mandatory - not a drop-in replacement. |
Compared with LM393DR and TLV3702IDR, the LM2903N delivers optimal balance of extended temperature range, proven robustness in noisy industrial environments, and pin-compatible upgrade path from legacy LM393 designs - without requiring layout changes or recalibration.
Availability
LM2903N is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial motor control, and power supply sequencing requiring stable component supply across long production lifecycles.
Supply support for LM2903N 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 with deep expertise in precision analog ICs and industrial-grade reliability.
The LM2903N belongs to TI's legacy precision comparator product line, engineered specifically for robust, low-cost, wide-supply-voltage analog threshold detection in safety-critical industrial and automotive subsystems.
FAQ
What is the maximum operating junction temperature for LM2903N?
The LM2903N has a specified operating junction temperature range of −40°C to +85°C. This rating is confirmed in Section 6.3 (Recommended Operating Conditions) of the official TI datasheet SNOSBJ6G. Exceeding +85°C may cause parametric shift or functional failure. The LM2903N datasheet explicitly limits TJ to this range - unlike the LM193-N (−55°C to +125°C) or LM393-N (0°C to +70°C).
Does LM2903N support true rail-to-rail input operation?
The LM2903N supports input common-mode voltage down to 0 V (ground) and up to (V+ − 1.5 V) - meaning it senses at ground on single supplies but does not reach the positive rail. It is *not* rail-to-rail input. True rail-to-rail input requires separate devices like the TLV3702. The LM2903N datasheet specifies "Input Common-Mode Voltage Range" as 0 V to (V+ − 1.5 V) at 25°C, confirming this limitation.
Can LM2903N outputs be wired together (wired-OR)?
Yes - the LM2903N features open-collector outputs that can be directly connected to a shared pull-up resistor. This wired-OR configuration is explicitly supported in the datasheet's Functional Description (Section 7.3) and Typical Applications (Figure 30). Both OUTA and OUTB sink current to GND independently, allowing logical OR of two comparator decisions without additional logic gates.
What is the minimum recommended pull-up resistor value for LM2903N outputs?
For reliable TTL/CMOS compatibility at V+ = 5 V, the minimum recommended pull-up is 10 kΩ - based on the LM2903N's 6.0 mA minimum sink current and 400 mV max saturation voltage. A 10-kΩ resistor yields ~0.5 mA load current and ensures VO ≤ 0.4 V when sinking, meeting TTL LOW-level requirements. Lower values increase power but improve speed; higher values risk noise susceptibility.
Is LM2903N pin-compatible with LM393?
Yes - the LM2903N and LM393 share identical 8-pin SOIC pinout, electrical specifications (except temperature grade), and functional behavior. TI confirms this in the Device Information table (page 3) and Pin Functions section (page 5) of SNOSBJ6G. Both use OUTA/–INA/+INA/GND/+INB/–INB/OUTB/V+ mapping. No PCB changes are required when upgrading from LM393 to LM2903N for extended temperature operation.
LM2903N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- 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):
- 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 FAQ
1.How can I place an order for LM2903N through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903N 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 reliable?
The price and inventory of LM2903N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903N is usually 5 days.
3.What payment methods are accepted for LM2903N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903N?
LM2903N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903N 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?
For technical support, including LM2903N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903N requirements.
6.How does Aetrix verify that LM2903N is sourced from the original manufacturer or authorized distributors?
All LM2903N 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 meets industry standards.
7.What is the process for return or replacement of LM2903N?
All LM2903N units undergo pre-shipment inspection (PSI). If there is an issue with LM2903N, 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 part is unused and in its original packaging.
Return procedure for LM2903N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903N Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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NCX2200GMAZ
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