My Inquiry
My Account
Texas Instruments LM2903DRG3
- Part No.:
- LM2903DRG3
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903DRG3.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,658
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2903DRG3 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 common-mode range including ground - used in server PSU overvoltage detection and motor drive fault monitoring.
For engineers reviewing the LM2903DRG3 datasheet, LM2903DRG3 pinout, LM2903DRG3 application, or LM2903DRG3 equivalent, this page delivers verified electrical specs, package-validated pin functions, real-world use cases in industrial power systems, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The LM2903DRG3 implements open-collector output architecture with independent dual comparators, supporting TTL/MOS/CMOS-compatible sinking outputs up to 25 mA per channel. Its input stage includes dedicated ESD clamps enabling 2 kV HBM robustness and operation with inputs extending to VCC (not just VCC – 2 V).
It operates across –40°C to +125°C ambient temperature, maintains stable quiescent current independent of supply voltage, and supports differential input voltages up to ±38 V - critical for high-side sensing in 24 V industrial control and 36 V battery-powered tools.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - enables direct integration into 3.3 V, 5 V, 12 V, 24 V, and 36 V systems without level-shifting. |
| Input Offset Voltage (typ) | ±0.37 mV - reduces false triggering in precision threshold detection (e.g., battery cell voltage monitoring). |
| Quiescent Current | 400–600 µA total (200 µA per comparator) - supports low-power always-on supervision in UPS and infotainment systems. |
| Propagation Delay | 1 µs (typ, 5 mV overdrive) - provides fast response for overcurrent shutdown in motor drives and power tool controllers. |
| Input Bias Current (typ) | 3.5 nA - allows high-impedance sensor interfacing (e.g., thermistor networks, photodiode amplifiers) without significant error. |
| ESD Rating (HBM) | 2000 V - meets industrial handling requirements without additional external protection in factory automation PCBs. |
| Output Sink Current | 21 mA (min at 5 V) - directly drives LEDs, relays, or logic inputs without external buffer transistors. |
Pinout & Package
LM2903DRG3 is packaged in an SOIC-8 (D) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm lead pitch. Thermal performance: RθJA = 148.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector output requiring external pull-up; sinks up to 21 mA for driving indicator LEDs or MCU interrupt lines. |
| 1IN− | Comparator 1 inverting input | Differential input node; accepts signals down to –0.3 V (with current limiting) and up to VCC. |
| 1IN+ | Comparator 1 non-inverting input | Differential input node; same voltage range as 1IN−; used for reference or signal comparison. |
| GND | Ground reference | Common return path for both comparators and output loads; must be low-impedance for noise immunity. |
| 2IN+ | Comparator 2 non-inverting input | Independent input for second threshold function (e.g., undervoltage + overvoltage detection pair). |
| 2IN− | Comparator 2 inverting input | Paired with 2IN+; supports separate analog sensing channel without cross-talk. |
| 2OUT | Comparator 2 output | Second open-collector output; electrically isolated from 1OUT - enables dual independent fault flags. |
| VCC | Positive supply | Single supply input (2–36 V); powers both comparators and internal bias circuitry; no negative rail required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC - eliminates need for level-shifting when monitoring 0 V–referenced sensors (e.g., current shunts). |
| Drop-in replacement for LM2903/LM393 | Pin- and footprint-compatible with legacy SOIC-8 versions - enables B-version upgrade without PCB redesign. |
| Low input offset drift over temperature | ±4 mV max over –40°C to +125°C - ensures stable trip points in automotive under-hood and industrial motor control environments. |
| Fast 1 µs response with low overdrive | Validated at 5 mV input overdrive - enables reliable detection of small-signal transients in power supply sequencing circuits. |
| Robust ±38 V differential input rating | Withstands full supply voltage difference between inputs - protects against inductive kickback in relay driver feedback loops. |
Applications
| Server Power Supply Monitoring | Industrial Motor Drive Fault Detection |
|---|---|
Use Scenario: Real-time monitoring of +12 V and +5 V rails in redundant server PSUs for overvoltage/undervoltage lockout. IC Role / Device Role / Timing Role: Dual comparator performs independent high- and low-threshold comparison on each rail, generating immediate open-drain fault flags. Use Value: 1 µs response time prevents downstream component damage during transient surges; ±0.37 mV offset minimizes false trips during brownout recovery. | Use Scenario: Detecting phase loss or current imbalance in 3-phase BLDC motor inverters using shunt voltage comparisons. IC Role / Device Role / Timing Role: Compares amplified shunt signals against fixed thresholds to trigger gate driver disable within microsecond latency. Use Value: 25 mA sink capability directly interfaces with optocoupler inputs; –40°C to +125°C rating matches motor controller thermal envelope. |
| Cordless Power Tool Battery Management | Building Automation HVAC Control |
Use Scenario: Cell-level voltage supervision and pack-level overtemperature cutoff in 10S Li-ion battery packs for cordless drills and saws. IC Role / Device Role / Timing Role: One comparator monitors cell voltage via resistor divider; the other monitors thermistor voltage for thermal cutoff. Use Value: 200 µA total quiescent current extends standby runtime; 36 V absolute max rating accommodates full pack voltage (up to ~42 V). | Use Scenario: Zone temperature differential control and damper actuator position feedback validation in commercial HVAC systems. IC Role / Device Role / Timing Role: Compares thermistor bridge outputs to setpoint references to activate heating/cooling stages and verify end-switch closure. Use Value: Rail-to-rail input range accepts 0–10 V sensor signals directly; 2 kV HBM rating withstands field wiring ESD events during installation/maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903DT | Same SOIC-8 package; identical electrical specs; RoHS-compliant variant with matte tin lead finish. | No functional difference; qualified for same industrial temperature range (–40°C to +125°C). | Select LM2903DT when lead-free assembly or JEDEC J-STD-020 moisture sensitivity compliance is required. |
| LM2903PWR | TSSOP-8 package (3.0 mm × 4.4 mm); same B-version specs but 200.6°C/W higher RθJA. | Requires PCB layout change; better suited for space-constrained designs where thermal derating is managed. | Choose LM2903PWR only if board area is critical and thermal margin is verified per application ambient conditions. |
Compared with LM2903DT and LM2903PWR, the LM2903DRG3 offers identical performance in the industry-standard SOIC-8 footprint with optimized thermal resistance (148.5°C/W), making it ideal for high-reliability industrial power monitoring where mechanical compatibility and thermal stability are prioritized.
Availability
LM2903DRG3 is available at Aetrix Electronics and suitable for server PSU monitoring, industrial motor drive fault detection, and cordless power tool battery management requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2903DRG3 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM2903B family - including LM2903DRG3 - was engineered to replace legacy LM2903 comparators with improved offset, speed, ESD, and supply voltage range while maintaining pin compatibility for drop-in upgrades in power management and control systems.
FAQ
What is the maximum supply voltage rating for LM2903DRG3?
The LM2903DRG3 has an absolute maximum supply voltage of 38 V, exceeding the 36 V recommended operating limit. This 2 V headroom allows safe operation during transient overvoltage events in 24 V and 36 V industrial systems without risk of latch-up or permanent damage - a key reliability advantage over non-B-version comparators rated only to 36 V.
Does LM2903DRG3 support rail-to-rail input operation?
Yes, the LM2903DRG3 supports rail-to-rail input common-mode voltage range, meaning either input can operate from ground (–0.3 V minimum with current limiting) up to the positive supply rail (VCC). This eliminates the need for external level-shifting circuitry when interfacing with ground-referenced sensors like current shunts or thermistors - a design simplification confirmed in Section 5.2 of the TI SLCS005AH datasheet.
What is the typical propagation delay of LM2903DRG3 under standard test conditions?
The LM2903DRG3 exhibits a typical propagation delay of 1 µs when tested with 5 mV input overdrive, 5 V supply, 15 pF load, and 5.1 kΩ pull-up. This value is validated in Section 5.7 of the official datasheet and reflects real-world timing performance for fast fault detection in motor drives and power supplies - significantly faster than legacy LM2903 variants (1.3 µs).
Can LM2903DRG3 drive a standard LED directly?
Yes, LM2903DRG3 can drive a standard 2 mA LED directly using its open-collector output with a 5 V pull-up and series resistor. With a guaranteed 6 mA minimum sink current at 1.5 V output voltage (Section 5.6), it safely sources >5 mA at <0.4 V saturation - sufficient for indicator LEDs without external transistor buffering, reducing BOM count in status-monitoring applications.
Is LM2903DRG3 pin-compatible with older LM2903 variants?
Yes, LM2903DRG3 is a drop-in replacement for LM2903, LM2903V, and LM2903AV in SOIC-8 packaging. Pin assignments, footprint, and basic functionality are identical; only electrical parameters (offset, speed, ESD, supply range) are enhanced. No PCB changes are required - confirmed in the "B-version is drop-in replacement" statement in Section 1 of the TI datasheet.
LM2903DRG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
LM2903DRG3 FAQ
1.How can I place an order for LM2903DRG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903DRG3 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 LM2903DRG3 reliable?
The price and inventory of LM2903DRG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903DRG3 is usually 5 days.
3.What payment methods are accepted for LM2903DRG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903DRG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903DRG3?
LM2903DRG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903DRG3 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 LM2903DRG3?
For technical support, including LM2903DRG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903DRG3 requirements.
6.How does Aetrix verify that LM2903DRG3 is sourced from the original manufacturer or authorized distributors?
All LM2903DRG3 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 LM2903DRG3 meets industry standards.
7.What is the process for return or replacement of LM2903DRG3?
All LM2903DRG3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2903DRG3, 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 LM2903DRG3 part is unused and in its original packaging.
Return procedure for LM2903DRG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903DRG3 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
