LM2903M Equivalent & Substitute Parts

Part Overview

The LM2903M is a dual general-purpose comparator manufactured by onsemi, housed in an 8-SOIC surface-mount package. This device features open-collector, rail-to-rail output configuration with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The LM2903M is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903M
Manufacturer	onsemi
Category	Linear
Type	General Purpose Comparator
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 105°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	Not specified

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903M is determined by the following critical parameters:

Mandatory Matching Criteria:

Package type: 8-SOIC (0.154", 3.90mm Width) surface mount
Number of elements: 2 comparators
Output type: Open-Collector configuration
Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input offset voltage: Maximum 7mV @ 5V or 30V
Input bias current: Maximum 0.25µA @ 5V
Output current: Typical 16mA @ 5V
Quiescent current: Maximum 2.5mA

Acceptable Variations:

Operating temperature range may extend beyond the original -40°C ~ 105°C specification
Product status may differ (active vs. obsolete)
Manufacturer may vary
RoHS compliance status may differ
Moisture sensitivity level may vary

Substitute parts are grouped into three categories: onsemi active equivalents (LM2903DR2G, LM2903VDR2G), cross-manufacturer direct equivalents (LM2903D from STMicroelectronics, LM2903M/NOPB from Texas Instruments), and functionally compatible alternatives from other manufacturers (LM393DR2G, NCV2903DR2G, AS393 series, BA10393F-E2).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Operating Temp	Package	RoHS Status
LM2903M	onsemi	Obsolete	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	-40°C ~ 105°C	8-SOIC	Not specified
LM2903DR2G	onsemi	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	-40°C ~ 105°C	8-SOIC	ROHS3 Compliant
LM2903VDR2G	onsemi	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant
LM393DR2G	onsemi	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	0°C ~ 70°C	8-SOIC	ROHS3 Compliant
NCV2903DR2G	onsemi	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant
LM2903D	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant
LM2903M/NOPB	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
AS393AMTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
AS393MTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
AS393MTR-G1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
BA10393F-E2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	-40°C ~ 85°C	8-SOP	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM2903DR2G and LM2903VDR2G from onsemi are the preferred substitutes. Both maintain identical electrical specifications to the LM2903M while offering active product status and ROHS3 compliance. LM2903VDR2G extends the operating temperature range to -40°C ~ 125°C, providing additional thermal margin for demanding applications.

LM2903D from STMicroelectronics and LM2903M/NOPB from Texas Instruments are direct cross-manufacturer equivalents with identical part number bases. Both are active products with ROHS3 compliance. The Texas Instruments variant operates to -40°C ~ 85°C, while the STMicroelectronics variant extends to -40°C ~ 125°C.

Secondary Substitutes (Functional Equivalents):

LM393DR2G from onsemi is functionally compatible but operates within a narrower temperature range (0°C ~ 70°C) and exhibits lower input offset voltage (5mV @ 30V). This part is suitable for applications not requiring the full -40°C lower temperature specification.

NCV2903DR2G from onsemi is an automotive-grade variant (AEC-Q100 qualified) with extended temperature range (-40°C ~ 125°C) and specified propagation delay (1.3µs). This part is appropriate for automotive and high-reliability applications.

Alternative Manufacturers:

AS393 series comparators from Diodes Incorporated (AS393AMTR-E1, AS393MTR-E1, AS393MTR-G1) and BA10393F-E2 from Rohm Semiconductor are functionally compatible alternatives. These parts maintain the required electrical specifications and package compatibility. The AS393 variants feature lower quiescent current (1mA vs. 2.5mA) and improved input offset voltage specifications. BA10393F-E2 uses an 8-SOP package (0.173", 4.40mm Width) instead of 8-SOIC, requiring PCB layout verification for pin-to-pin compatibility.

Compliance Considerations:

All active substitute parts listed carry ROHS3 compliance certification. The original LM2903M does not specify RoHS status. For applications requiring RoHS compliance documentation, any of the listed active substitutes provide certified alternatives.

Frequently Asked Questions (FAQ)

Q: Can LM2903DR2G directly replace LM2903M without PCB modifications?

A: Yes. LM2903DR2G maintains identical 8-SOIC package dimensions (0.154", 3.90mm Width), pin configuration, and electrical specifications. No PCB layout changes are required.

Q: What is the difference between LM2903DR2G and LM2903VDR2G?

A: Both parts are electrically equivalent. LM2903VDR2G extends the operating temperature range to -40°C ~ 125°C compared to -40°C ~ 105°C for LM2903DR2G. Select LM2903VDR2G for applications requiring operation above 105°C.

Q: Is NCV2903DR2G suitable for non-automotive applications?

A: Yes. NCV2903DR2G is AEC-Q100 qualified for automotive use but functions identically to standard LM2903 comparators in non-automotive circuits. The automotive qualification provides additional process and reliability documentation.

Q: Why does BA10393F-E2 have a different package width (4.40mm vs. 3.90mm)?

A: BA10393F-E2 uses an 8-SOP package instead of 8-SOIC. While both are 8-pin surface-mount packages, the 4.40mm width requires PCB footprint verification. Pin pitch and spacing differ; direct PCB substitution is not possible without layout modification.

Q: Can AS393 series parts replace LM2903M in all applications?

A: AS393 series parts are functionally compatible and maintain the required electrical specifications. However, AS393 variants feature lower quiescent current (1mA vs. 2.5mA) and improved input offset voltage. Applications sensitive to quiescent current or offset voltage specifications should be evaluated individually.

Q: What is the significance of the input offset voltage difference between LM2903M (7mV @ 5V) and AS393AMTR-E1 (3mV @ 5V)?

A: Lower input offset voltage improves comparator accuracy and reduces threshold uncertainty. AS393AMTR-E1 provides superior offset performance. Applications requiring precise threshold detection benefit from this specification improvement.

Q: Are all listed substitutes ROHS3 compliant?

A: All active substitute parts carry ROHS3 compliance certification. The original LM2903M does not specify RoHS status. For procurement requiring RoHS documentation, select any active substitute from the list.

Q: What packaging options are available for LM2903 comparators?

A: All listed substitutes are supplied in 8-SOIC surface-mount packages except BA10393F-E2, which uses 8-SOP. Packaging options include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Tube formats depending on the specific part number and manufacturer.

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