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Texas Instruments LM2903MX
- Part No.:
- LM2903MX
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903MX.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,238
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Product details
Overview
LM2903MX 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 maximum 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 management circuits.
For engineers reviewing the LM2903MX datasheet, LM2903MX pinout, LM2903MX application, or LM2903MX equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, real-world use cases in overvoltage protection and zero-crossing detection, and two validated alternative comparators with documented functional differences.
Technical Context
The LM2903MX implements two independent open-collector NPN output comparators with PNP input stages, supporting operation from 2.0 V to 36 V single supply or ±1.0 V to ±18 V dual supply. Its input common-mode voltage range extends to ground, and differential input voltage tolerance reaches ±36 V - allowing direct sensing of signals referenced to system ground without level-shifting.
Each comparator delivers 6–16 mA sink capability, 250 mV typical saturation voltage at 4 mA, and TTL/CMOS-compatible output logic levels. The device exhibits 1.3 μs typical response time under 5.1 kΩ load and maintains stable performance across −40°C to +85°C operating junction temperature.
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 wide-input industrial and automotive power rails. |
| Input Offset Voltage | ±2.0 mV (max) at 25°C - enables accurate threshold detection within ±5 mV windows. |
| Supply Current | 0.4 mA (typ) at 5 V - allows continuous operation in multi-year battery-powered systems. |
| Input Bias Current | 25 nA (max) - permits use with high-impedance sensor bridges and RC timing networks. |
| Output Saturation Voltage | 250 mV (max) at 4 mA sink - ensures reliable logic-low assertion into 5 V TTL and 3.3 V CMOS loads. |
| Input Common-Mode Range | Includes ground (0 V) up to V+−1.5 V - eliminates need for negative supply in ground-referenced sensing. |
| Response Time | 1.3 μs (typ) with 5.1 kΩ load - suitable for line-frequency monitoring and moderate-speed control loops. |
Pinout & Package
LM2903MX is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), compatible with standard surface-mount assembly processes and IPC-7351B footprint IPC7351SOIC8_49x39N.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Open-collector output, Channel A | Sinks up to 16 mA; requires external pull-up to define HIGH level - enables wired-OR logic and mixed-voltage interfacing. |
| 2 (−INA) | Inverting input, Channel A | Accepts reference or feedback signal; biased by 25 nA PNP input stage - minimizes loading on high-Z sources. |
| 3 (+INA) | Non-inverting input, Channel A | Receives sensed signal; common-mode range includes ground - supports direct connection to shunt resistors or thermistors. |
| 4 (GND) | Ground reference | Common return for both comparators and supply - serves as reference for single-supply operation and input bias network. |
| 5 (+INB) | Non-inverting input, Channel B | Dedicated input for second threshold comparison - enables dual-limit detection (e.g., window comparator with external resistors). |
| 6 (−INB) | Inverting input, Channel B | Independent reference input for Channel B - allows asynchronous monitoring of separate analog conditions. |
| 7 (OUTB) | Open-collector output, Channel B | Functionally identical to OUTA; electrically isolated - supports redundant outputs or independent control paths. |
| 8 (V+) | Positive power supply | Accepts 2.0–36 V DC; powers both comparators and internal bias network - eliminates need for separate regulators in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-sensing capability | Input common-mode range includes 0 V - enables direct interface with current-sense shunts and battery terminals without level shifters. |
| Low quiescent current | 0.4 mA at 5 V - reduces standby power in always-on monitoring circuits such as smoke detectors and battery fuel gauges. |
| Wide supply voltage tolerance | 2.0 V to 36 V operation - accommodates 3.3 V microcontrollers, 12 V automotive, and 24 V industrial control rails in one BOM item. |
| Open-collector outputs | Independent NPN sink outputs per channel - support wired-OR logic, mixed-voltage interfacing (e.g., 5 V logic driving 3.3 V MCU), and fail-safe LOW assertions. |
| High input impedance | 25 nA max input bias current - preserves accuracy in high-resistance divider networks used for voltage monitoring and temperature sensing. |
Applications
| Battery Voltage Monitor | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.25 V and warning at 4.10 V. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - Channel A compares against upper threshold, Channel B against lower threshold. Use Value: Enables precise, low-power state-of-charge indication using only two external resistors and no external reference IC. |
Use Scenario: Preventing damage to downstream 5 V logic from accidental 12 V supply misconnection. IC Role / Device Role / Timing Role: Single comparator comparing input voltage against 5.5 V reference - asserts active-low fault signal when exceeded. Use Value: Delivers sub-millisecond response to overvoltage events while consuming <1 mW in normal operation. |
| AC Zero-Crossing Detector | Industrial Temperature Threshold Alarm |
|
Use Scenario: Synchronizing TRIAC firing in dimmer circuits using 120 VAC mains waveform. IC Role / Device Role / Timing Role: Comparator with resistor-divider input and hysteresis - converts sinusoidal input to clean 5 V square wave aligned to zero crossings. Use Value: Achieves <100 μs timing jitter across temperature due to low offset drift and rail-to-rail input capability. |
Use Scenario: Alerting maintenance staff when motor winding temperature exceeds 105°C, measured via PT100 RTD bridge. IC Role / Device Role / Timing Role: Precision comparator comparing amplified RTD voltage against fixed reference - drives LED and latching relay. Use Value: Maintains ±2°C trip-point accuracy over −40°C to +85°C ambient without calibration, leveraging low VOS drift. |
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; wider temperature grade (0°C to +70°C vs. −40°C to +85°C for LM2903MX); 7 mV max offset voltage. | Approved for commercial-grade consumer electronics; not rated for extended industrial temperature operation. | Select LM393DR only for cost-sensitive, non-industrial applications where ambient stays within 0–70°C. |
| TLV3702IDR | Rail-to-rail input/output; 1.8 V to 16 V supply; 1.5 mV max offset; 85 μA supply current - significantly lower power but narrower voltage range. | Optimized for ultra-low-power portable devices; lacks 36 V tolerance and ground-sensing capability of LM2903MX. | Choose TLV3702IDR when battery life is critical and supply voltage remains ≤16 V; avoid for 24 V industrial or automotive use. |
Compared with LM393DR and TLV3702IDR, the LM2903MX uniquely balances wide supply range (2–36 V), guaranteed ground-sensing input, industrial temperature rating, and sub-1 mA quiescent current - making it the default choice for robust, multi-rail embedded monitoring.
Availability
LM2903MX is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial power supply supervision, and AC line monitoring requiring stable component supply and long-term manufacturability.
Supply support for LM2903MX 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2903MX belongs to TI's legacy precision comparator product line, engineered specifically for reliable, low-cost threshold detection in harsh environments where wide supply range, ground-referenced inputs, and open-collector flexibility are essential.
FAQ
What is the operating temperature range for the LM2903MX?
The LM2903MX is specified for operation from −40°C to +85°C junction temperature. This industrial-grade range supports deployment in automotive engine compartments, factory-floor controllers, and outdoor power equipment where ambient extremes are expected. The LM2903MX datasheet confirms these limits under Recommended Operating Conditions, Table 6.3.
Does the LM2903MX require a dual power supply?
No, the LM2903MX operates fully from a single supply ranging from 2.0 V to 36 V. Its input common-mode voltage range includes ground (0 V), allowing direct sensing of signals referenced to system ground without negative rails. Dual-supply operation (±1.0 V to ±18 V) is supported but optional - confirmed in Features and Section 6.3 of the LM2903MX datasheet.
Can the LM2903MX drive a 5 V TTL load directly?
Yes, the LM2903MX open-collector outputs are compatible with TTL, DTL, ECL, MOS, and CMOS logic. When pulled up to 5 V, the output sinks up to 16 mA while maintaining ≤400 mV saturation voltage - ensuring valid LOW-level assertion for standard TTL inputs. This is explicitly stated in the Features section and Electrical Characteristics Table 6.7.
What is the maximum input voltage the LM2903MX can tolerate?
The LM2903MX tolerates differential input voltages up to ±36 V and absolute input voltages from −0.3 V to +36 V - exceeding the supply rail. Inputs may safely exceed V+ as long as the other input remains within the common-mode range (0 V to V+−1.5 V). This is documented in Absolute Maximum Ratings (Table 6.1) and clarified in Note 4 of the datasheet.
Is the LM2903MX pin-compatible with the LM393?
Yes, the LM2903MX and LM393 share identical SOIC-8 pinouts, electrical characteristics, and functional behavior. Both devices use the same pin configuration (OUTA, −INA, +INA, GND, +INB, −INB, OUTB, V+) and match in key specs including supply current, offset voltage, and output sink capability - verified in Device Information and Pin Functions sections of the shared datasheet SNOSBJ6G.
LM2903MX 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):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM2903MX FAQ
1.How can I place an order for LM2903MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903MX 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 LM2903MX reliable?
The price and inventory of LM2903MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903MX is usually 5 days.
3.What payment methods are accepted for LM2903MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903MX?
LM2903MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903MX 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 LM2903MX?
For technical support, including LM2903MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903MX requirements.
6.How does Aetrix verify that LM2903MX is sourced from the original manufacturer or authorized distributors?
All LM2903MX 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 LM2903MX meets industry standards.
7.What is the process for return or replacement of LM2903MX?
All LM2903MX units undergo pre-shipment inspection (PSI). If there is an issue with LM2903MX, 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 LM2903MX part is unused and in its original packaging.
Return procedure for LM2903MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903MX Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
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