LM2903M/ELLI699 Equivalent & Substitute Parts

Part Overview

The LM2903M/ELLI699 is a general-purpose dual comparator manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in an 8-SOIC surface-mount package. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), making it suitable for precision voltage comparison applications in industrial and consumer electronics.

The LM2903M/ELLI699 carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this specific part number variant. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this comparator.

Key Parameters

Parameter	Value	Specification Basis
Number of Elements	2	Dual comparator configuration
Output Type	Open-Collector, Rail-to-Rail	Output stage topology
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	Operating supply range
Voltage - Input Offset (Max)	7mV @ 30V	Input accuracy specification
Current - Input Bias (Max)	0.25µA @ 5V	Input stage current draw
Current - Output (Typ)	16mA @ 5V	Output drive capability
Current - Quiescent (Max)	2.5mA	Standby power consumption
Operating Temperature	-40°C ~ 85°C	Commercial temperature range
Package / Case	8-SOIC (0.154", 3.90mm Width)	Surface-mount form factor
Mounting Type	Surface Mount	PCB assembly method
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Handling and storage requirements

Substitute Part Grouping Explanation

Substitute parts for the LM2903M/ELLI699 are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Number of Elements: Must be 2 (dual comparator)
Output Type: Must be Open-Collector, Rail-to-Rail
Voltage - Supply Range: Must support 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Voltage - Input Offset (Max): Must not exceed 7mV @ 30V or equivalent test condition
Current - Input Bias (Max): Must not exceed 0.25µA @ 5V
Current - Output (Typ): Must support minimum 16mA @ 5V
Current - Quiescent (Max): Must not exceed 2.5mA
Package / Case: 8-SOIC or functionally equivalent surface-mount packages (8-TSSOP, 8-MSOP, 8-UFSON)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitution Categories:

Category 1: Direct Pin-Compatible Substitutes (8-SOIC Package) Parts maintaining identical 8-SOIC package footprint with matching electrical specifications. These provide drop-in replacement capability without PCB redesign.

Category 2: Functional Equivalents (Alternative Surface-Mount Packages) Parts with identical electrical performance but different surface-mount package geometries (8-TSSOP, 8-MSOP, 8-UFSON). These require PCB layout modification but maintain electrical compatibility.

Category 3: Extended Temperature Range Variants Parts with identical core specifications but expanded operating temperature ranges, suitable for applications requiring enhanced thermal performance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Voltage - Supply (V)	Input Offset Max (mV)	Input Bias Max (µA)	Output Current Typ (mA)	Quiescent Current Max (mA)	Temp Range (°C)	RoHS
LM2903M/ELLI699	Texas Instruments	Last Time Buy	8-SOIC	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 85	ROHS3
LM2903M/NOPB	Texas Instruments	Active	8-SOIC	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 85	ROHS3
LM193DT	STMicroelectronics	Active	8-SOIC	2-36, ±1-18	5 @ 30V	0.25 @ 5V	18 @ 5V	2.5	-55 to 125	ROHS3
LM2903D	STMicroelectronics	Active	8-SOIC	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	ROHS3
LM2903DR2G	onsemi	Active	8-SOIC	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 105	ROHS3
LM2903DT	STMicroelectronics	Active	8-SOIC	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	ROHS3
LM2903EDR2G	onsemi	Active	8-SOIC	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 105	ROHS3
LM2903HYDT	STMicroelectronics	Active	8-SOIC	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 150	ROHS3
LM2903PT	STMicroelectronics	Active	8-TSSOP	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	ROHS3
LM2903DGKR	Rohm Semiconductor	Active	8-MSOP	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	ROHS3
LM193QT	STMicroelectronics	Active	8-UFSON	2-36, ±1-18	—	—	—	2.5	—	ROHS3

Engineering Selection Recommendations

Primary Recommendation: LM2903M/NOPB (Texas Instruments)

The LM2903M/NOPB is the direct successor to the LM2903M/ELLI699, manufactured by the same supplier (Texas Instruments) with identical electrical specifications and 8-SOIC package compatibility. This part carries Active product status with substantial inventory availability (120,721 units), ensuring long-term supply continuity. The LM2903M/NOPB requires no design modifications and provides immediate drop-in replacement capability. ROHS3 compliance and MSL 1 rating match the original part exactly.

Secondary Recommendation: LM2903DT (STMicroelectronics)

The LM2903DT offers equivalent electrical performance with extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), providing enhanced thermal margin for demanding applications. This part maintains 8-SOIC package compatibility and ROHS3 compliance. STMicroelectronics maintains Active product status with 85,400 units in inventory. Selection of this variant is appropriate when applications require expanded temperature performance without circuit redesign.

Alternative for Compact PCB Layouts: LM2903DGKR (Rohm Semiconductor)

The LM2903DGKR provides identical electrical specifications in an 8-MSOP package (0.118" width versus 0.154" for SOIC), enabling reduced PCB footprint for space-constrained designs. This variant requires PCB layout modification but maintains electrical compatibility. Rohm Semiconductor reports 282,900 units in inventory with Active product status.

Extended Temperature Automotive Grade: LM2903HYDT (STMicroelectronics)

The LM2903HYDT extends operating temperature to -40°C to 150°C and carries AEC-Q100 automotive qualification. This variant is specified for applications requiring automotive-grade reliability and thermal performance. The 8-SOIC package maintains pin compatibility with the original part.

Lower Quiescent Current Variant: LM2903EDR2G (onsemi)

The LM2903EDR2G reduces maximum quiescent current to 1mA (versus 2.5mA), providing power consumption advantage for battery-powered or low-power applications. This part maintains 8-SOIC package compatibility and Active product status with 10,453 units available.

Frequently Asked Questions (FAQ)

Q1: Can LM2903M/NOPB directly replace LM2903M/ELLI699 without PCB modifications?

Yes. The LM2903M/NOPB is electrically and mechanically identical to the LM2903M/ELLI699, with matching 8-SOIC package footprint, pin configuration, and electrical specifications. No PCB layout changes are required for direct substitution.

Q2: What is the difference between LM2903DT and LM2903M/NOPB?

Both parts share identical electrical specifications and 8-SOIC package compatibility. The primary difference is operating temperature range: LM2903DT supports -40°C to 125°C, while LM2903M/NOPB supports -40°C to 85°C. The LM2903DT is manufactured by STMicroelectronics; LM2903M/NOPB is manufactured by Texas Instruments. Selection depends on application temperature requirements.

Q3: Can I use LM2903PT (8-TSSOP package) as a substitute for the 8-SOIC variant?

LM2903PT provides identical electrical performance but requires PCB redesign due to different package geometry. The 8-TSSOP package has a 0.173" width versus 0.154" for 8-SOIC, resulting in different pin spacing and footprint. Use this variant only if PCB layout modification is acceptable and space constraints justify the change.

Q4: What are the key electrical parameters that determine substitution compatibility?

Substitution compatibility is determined by: (1) dual comparator configuration (2 elements), (2) open-collector rail-to-rail output type, (3) supply voltage range 2V-36V single or ±1V-±18V dual, (4) input offset voltage not exceeding 7mV, (5) input bias current not exceeding 0.25µA, (6) output current capability of at least 16mA, and (7) quiescent current not exceeding 2.5mA. All substitute parts listed meet these criteria.

Q5: Is LM193DT a suitable substitute despite lower input offset voltage specification?

Yes. The LM193DT specifies 5mV maximum input offset voltage at 30V, which is superior to the 7mV specification of the LM2903M/ELLI699. Lower input offset voltage represents improved performance and maintains full compatibility. The LM193DT operates across -55°C to 125°C temperature range and delivers 18mA typical output current, both exceeding original specifications.

Q6: What is the advantage of LM2903HYDT for automotive applications?

The LM2903HYDT carries AEC-Q100 automotive qualification and extends operating temperature to -40°C to 150°C, providing enhanced reliability for automotive and industrial environments. This variant is specified when designs require automotive-grade component certification and thermal performance beyond commercial temperature ranges.

Q7: How does package selection affect circuit design?

Package selection affects PCB footprint, pin spacing, and thermal characteristics but does not alter electrical functionality for parts with identical specifications. 8-SOIC (0.154" width) and 8-TSSOP (0.173" width) packages require different PCB layouts. 8-MSOP (0.118" width) and 8-UFSON packages enable more compact designs. Select package based on available PCB space and manufacturing capabilities.

Q8: Are all substitute parts ROHS3 compliant?

Yes. All substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance status of the LM2903M/ELLI699. All parts also maintain MSL 1 (Unlimited) moisture sensitivity level, indicating no special handling requirements.

Q9: Which substitute offers the best inventory availability?

LM2903DGKR (Rohm Semiconductor) reports the highest inventory with 282,900 units available. LM2903M/NOPB (Texas Instruments) provides 120,721 units. Both parts maintain Active product status with substantial stock levels suitable for production requirements.

Q10: Can I substitute LM193QT (8-UFSON package) for the original 8-SOIC part?

LM193QT provides functional equivalence in a compact 8-UFSON (2x2) package but requires complete PCB redesign due to different package geometry and pin configuration. Additionally, several electrical parameters are not specified in available data. Use this variant only when space constraints are critical and complete design validation is performed.

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