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Texas Instruments LM2903PSR
- Part No.:
- LM2903PSR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM2903PSR.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,949
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Product details
Overview
LM2903PSR 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 capability down to ground-enabling precise threshold detection in industrial power supply monitoring and motor control feedback loops.
For engineers reviewing the LM2903PSR datasheet, LM2903PSR pinout, LM2903PSR application, or LM2903PSR equivalent, this page delivers verified electrical specs, package-validated pin functions, real-world use cases in server PSUs and factory automation, and two confirmed drop-in alternatives with documented thermal and output drive differences.
Technical Context
The LM2903PSR implements open-collector output stages compatible with TTL, MOS, and CMOS logic families, supporting external pull-up voltages up to 38 V. Its input stage includes dedicated ESD clamps enabling 2 kV HBM robustness and common-mode range extending to VCC – 2 V while tolerating inputs at full supply voltage without damage.
Designed for wide-temperature industrial operation (–40°C to +125°C), it maintains stable propagation delay (1 µs typ) and low input bias current (3.5 nA typ) across its full supply range, making it suitable for high-accuracy zero-crossing detection and overvoltage protection circuits where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports direct connection to 24 V industrial rails and 36 V battery systems without regulation |
| Input Offset Voltage (max) | ±4 mV over temperature - enables reliable 10 mV-level threshold discrimination in precision sensing |
| Quiescent Current | 600 µA max at 36 V - allows always-on monitoring in energy-sensitive embedded controllers |
| Propagation Delay | 1 µs typical at 5 V - ensures sub-microsecond response for fast fault detection in motor drives |
| Input Bias Current (typ) | 3.5 nA - minimizes loading error on high-impedance sensor bridges and RC timing networks |
| ESD Rating (HBM) | 2000 V - meets IEC 61000-4-2 Level 2 requirements for board-level handling robustness |
| Output Sink Current | 21 mA at 1.5 V VOL - drives standard LEDs or optocouplers directly without buffer transistors |
Pinout & Package
LM2903PSR is supplied in an 8-pin SOIC (PS) package with 4.90 mm × 3.91 mm body size and standard JEDEC MS-012AC footprint. Thermal performance is characterized by RθJA = 148.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector node requiring external pull-up; sinks up to 21 mA when active low |
| 1IN− | Comparator 1 inverting input | Differential input referenced to 1IN+; accepts signals from ground to VCC |
| 1IN+ | Comparator 1 non-inverting input | Differential input referenced to 1IN−; supports rail-to-rail common-mode range |
| GND | Ground reference | Common return for both comparators and internal bias circuitry |
| VCC | Positive supply | Single supply input supporting 2 V to 36 V; powers both comparators and ESD protection |
| 2IN+ | Comparator 2 non-inverting input | Independent input channel with identical voltage range and bias characteristics as 1IN+ |
| 2IN− | Comparator 2 inverting input | Independent differential input; may be used for window or hysteresis configurations |
| 2OUT | Comparator 2 output | Second open-collector output, electrically isolated from 1OUT but sharing VCC and GND |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC – 2 V - eliminates need for level-shifting in low-side current sensing |
| Drop-in replacement for LM2903 | Pin- and function-compatible with legacy LM2903, LM2903V, and LM2903AV - no PCB changes required |
| Enhanced ESD ruggedness | 2 kV HBM rating with dedicated input clamps - reduces field failure risk in automated assembly environments |
| Low propagation delay variation | 1 µs typical with <300 ns high-to-low delay under TTL conditions - improves timing margin in fast-switching applications |
| Wide operating temperature range | –40°C to +125°C - qualified for under-hood automotive and industrial motor drive ambient conditions |
Applications
| Overvoltage Protection Circuit | Motor Phase Monitoring |
|---|---|
Use Scenario: Detects DC bus voltage exceeding 30 V in a 24 V server PSU to trigger shutdown before downstream components are damaged. IC Role / Device Role / Timing Role: Dual comparator configured as window detector with hysteresis; one channel monitors upper threshold, the other lower. Use Value: Leverages rail-to-rail input and 1 µs response to react within 2 µs of overvoltage event, meeting IEC 62368-1 fault-clearing timing requirements. | Use Scenario: Monitors back-EMF zero-crossing points in a 3-phase BLDC motor controller to commutate windings precisely. IC Role / Device Role / Timing Role: Comparator compares phase voltage to mid-rail reference; outputs feed microcontroller input capture timer. Use Value: 3.5 nA input bias current prevents distortion of high-impedance RC-filtered back-EMF signals, maintaining commutation accuracy across speed range. |
| Industrial Temperature Sensor Interface | Factory Automation Safety Interlock |
Use Scenario: Interfaces thermistor-based temperature sensors in PLC analog input modules, converting resistance changes into digital alerts at preset thresholds. IC Role / Device Role / Timing Role: Comparator compares amplified thermistor voltage against programmable reference; output drives isolation barrier. Use Value: ±4 mV max offset voltage ensures ≤0.5°C measurement uncertainty at 25°C, meeting Class B RTD accuracy requirements per IEC 61000-6-4. | Use Scenario: Validates emergency stop button closure and guard door position in CNC machine tool safety circuits per ISO 13857. IC Role / Device Role / Timing Role: Dual comparator verifies redundant contact states and validates time-delayed confirmation pulses. Use Value: 200 µA quiescent current enables continuous monitoring without compromising system standby power budget in Category 3 safety architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 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 +125°C) | Limited to commercial/industrial equipment with lower thermal derating margins | Select when full automotive-grade temperature range is unnecessary and cost optimization is prioritized |
| LM2903PWR | TSSOP-8 package (3.0 mm × 4.4 mm); same electrical performance but 40% smaller footprint and higher RθJA (200.6°C/W) | Suitable for space-constrained designs where thermal management via PCB copper is feasible | Select when board area is critical and thermal design accommodates higher junction-to-ambient resistance |
Compared with LM2903DR and LM2903PWR, LM2903PSR uniquely combines full –40°C to +125°C qualification, SOIC-8 mechanical compatibility with legacy layouts, and optimized thermal resistance (148.5°C/W) for convection-cooled industrial enclosures - making it the preferred choice for long-lifecycle, thermally demanding deployments.
Availability
LM2903PSR is available at Aetrix Electronics and suitable for server power supplies, motor drives, and factory automation systems requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature grade compliance.
Supply support for LM2903PSR 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 communications markets.
The LM2903PSR belongs to TI's industry-standard dual comparator product line, engineered specifically for robust, low-cost voltage comparison in harsh industrial environments where reliability, wide supply range, and temperature resilience are mandatory.
FAQ
What is the maximum supply voltage rating for LM2903PSR?
The LM2903PSR has an absolute maximum supply voltage rating of 38 V, with recommended operating range from 2 V to 36 V. This extended rating enables direct interface with 36 V battery systems and unregulated industrial rails without external regulation, while maintaining specified performance across the full range. The 38 V limit applies to both continuous operation and transient conditions per TI's SLCS005AH datasheet Section 5.1.
Does LM2903PSR support rail-to-rail input operation?
Yes, LM2903PSR supports rail-to-rail common-mode input voltage range, including ground (V–) and extending to VCC – 2 V. Either or both inputs may reach the full VCC level without damage, and only one input needs to remain within the valid common-mode range for correct output state. This capability eliminates level-shifting circuitry in low-side current sensing and thermistor interfaces, as confirmed in Section 5.5 and 5.6 of the LM2903B/LM393B datasheet.
What is the typical input offset voltage of LM2903PSR and how does it vary with temperature?
The LM2903PSR exhibits ±0.37 mV typical input offset voltage at 25°C, with a maximum of ±4 mV over the full –40°C to +125°C operating range. This specification is validated in Section 5.6 of the datasheet for LM2903B devices in SOIC packages. The tight offset enables accurate threshold detection in precision applications such as temperature monitoring and overvoltage protection where sub-10 mV resolution is required.
Can LM2903PSR replace legacy LM2903 variants without layout changes?
Yes, LM2903PSR is a pin-compatible drop-in replacement for LM2903, LM2903V, and LM2903AV in SOIC-8 packaging. It retains identical pinout, footprint, and solder-reflow profile while improving key parameters: lower offset voltage (±4 mV vs. ±15 mV), faster response (1 µs vs. 1.3 µs), and enhanced ESD rating (2 kV HBM). No PCB modifications are needed, as confirmed in the "B-version is drop-in replacement" statement in Section 1 of the datasheet.
What output logic families is LM2903PSR compatible with?
LM2903PSR features open-collector outputs compatible with TTL, MOS, and CMOS logic families. Its output can sink up to 21 mA while maintaining VOL ≤ 400 mV at 4 mA load, allowing direct interfacing with 5 V TTL inputs, 3.3 V CMOS gates, and optocoupler LEDs. Pull-up voltage may extend to 38 V, supporting mixed-voltage system interfacing - all verified in Sections 5.6 and 5.7 of the official TI datasheet.
LM2903PSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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 @ 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-SO
LM2903PSR FAQ
1.How can I place an order for LM2903PSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903PSR 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 LM2903PSR reliable?
The price and inventory of LM2903PSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903PSR is usually 5 days.
3.What payment methods are accepted for LM2903PSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903PSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903PSR?
LM2903PSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903PSR 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 LM2903PSR?
For technical support, including LM2903PSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903PSR requirements.
6.How does Aetrix verify that LM2903PSR is sourced from the original manufacturer or authorized distributors?
All LM2903PSR 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 LM2903PSR meets industry standards.
7.What is the process for return or replacement of LM2903PSR?
All LM2903PSR units undergo pre-shipment inspection (PSI). If there is an issue with LM2903PSR, 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 LM2903PSR part is unused and in its original packaging.
Return procedure for LM2903PSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903PSR Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
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LM393DT
STMicroelectronics
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LM2901PWR
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LM2903DT
STMicroelectronics
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LM393DR
Texas Instruments
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LM239DR
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LM339APWR
Texas Instruments
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LM2903P
Texas Instruments
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LM393ADR
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NCX2200GMAZ
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