LM2903MX Equivalent & Substitute Parts

Part Overview

The LM2903MX is a general-purpose dual comparator IC manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in an 8-SOIC surface-mount package. This device is classified as obsolete, though functionally equivalent active alternatives are available from multiple manufacturers. Identifying suitable substitutes is necessary to ensure design continuity and maintain supply chain reliability for applications requiring dual-comparator functionality with the specified electrical and mechanical characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903MX
Manufacturer	Texas Instruments
Product Category	Linear - Comparator
Type	General Purpose
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 85°C
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903MX is determined by the following critical parameters:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
Open-Collector output type with rail-to-rail capability
Supply voltage range: 2V ~ 36V, ±1V ~ 18V
Input offset voltage maximum: 7mV @ 30V or better
Input bias current maximum: 0.25µA @ 5V or better
Output current capability: 16mA @ 5V minimum
Quiescent current maximum: 2.5mA or better

Mechanical Compatibility Requirements:

8-pin surface-mount package (8-SOIC or 8-SOP variants)
Pin-compatible footprint (0.154" to 0.173" width tolerance)

Operational Requirements:

Operating temperature range: -40°C minimum to 85°C minimum upper limit
RoHS compliance status (active substitutes are RoHS3 compliant)
MSL rating: 1 (Unlimited) preferred

Substitute parts are grouped into two categories: direct pin-compatible replacements from active manufacturers, and functionally equivalent alternatives with minor package variations that maintain electrical performance within specified tolerances.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	RoHS Status
LM2903MX	Texas Instruments	Obsolete	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	8-SOIC (0.154")	Non-compliant
LM2903MX/NOPB	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	8-SOIC (0.154")	ROHS3 Compliant
LM193DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-55°C ~ 125°C	8-SOIC (0.154")	ROHS3 Compliant
LM2903DR2G	onsemi	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	8-SOIC (0.154")	ROHS3 Compliant
LM2903DR	UMW	Active	Open-Collector, Rail-to-Rail	2V ~ 30V, ±1V ~ ±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC (0.154")	ROHS3 Compliant
BA10393F-E2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC (0.173")	ROHS3 Compliant
BA2903F-E2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	8-SOIC (0.173")	ROHS3 Compliant
BA2903SF-E2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 105°C	8-SOIC (0.173")	ROHS3 Compliant
BA2903YF-CE2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	4mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	8-SOIC (0.173")	ROHS3 Compliant
BA2903YF-MGE2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	8-SOIC (0.173")	ROHS3 Compliant
AP393AM8G-13	Diodes Incorporated	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	8mV @ 5V	0.4µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-MSOP (0.118")	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

LM2903MX/NOPB (Texas Instruments) provides identical electrical specifications and package dimensions to the original LM2903MX. This part maintains active product status and achieves RoHS3 compliance, making it the preferred direct substitute for new designs and existing inventory replacement.

LM193DT (STMicroelectronics) offers pin-compatible 8-SOIC packaging with superior input offset voltage performance (5mV vs. 7mV) and extended operating temperature range (-55°C to 125°C). This part is suitable for applications requiring enhanced temperature performance or tighter input offset specifications.

LM2903DR2G (onsemi) maintains identical electrical parameters to the original part with extended upper operating temperature limit (105°C vs. 85°C) and active product status with RoHS3 compliance.

Tier 2 - Package-Compatible Alternatives:

BA2903F-E2, BA2903SF-E2, BA2903YF-CE2, and BA2903YF-MGE2 (Rohm Semiconductor) are functionally equivalent with 8-SOP packaging (0.173" width vs. 0.154" standard). These parts maintain electrical compatibility and offer extended temperature ranges. BA2903YF-CE2 and BA2903YF-MGE2 include automotive-grade qualification (AEC-Q100) suitable for automotive applications.

BA10393F-E2 (Rohm Semiconductor) provides improved quiescent current performance (1mA vs. 2.5mA) with 8-SOP packaging and extended temperature range.

Tier 3 - Functional Equivalents with Constraints:

LM2903DR (UMW) operates within reduced supply voltage range (2V ~ 30V vs. 2V ~ 36V) and narrower operating temperature window (0°C ~ 70°C). Selection requires verification of application voltage and temperature requirements.

AP393AM8G-13 (Diodes Incorporated) features 8-MSOP packaging (0.118" width) with different pin pitch, requiring PCB layout modification. Operating temperature range is limited to 0°C ~ 70°C. Input bias current specification is higher (0.4µA vs. 0.25µA).

Frequently Asked Questions (FAQ)

Q: Can LM2903MX/NOPB be used as a direct drop-in replacement for LM2903MX?

A: Yes. LM2903MX/NOPB is electrically and mechanically identical to LM2903MX, with the primary difference being active product status and RoHS3 compliance. Pin configuration, package dimensions (8-SOIC, 0.154" width), and all electrical specifications are equivalent.

Q: What is the difference between 8-SOIC and 8-SOP packaging?

A: Both are 8-pin surface-mount packages with identical pin configurations. The primary difference is package width: 8-SOIC standard is 0.154" (3.90mm), while 8-SOP variants are 0.173" (4.40mm). PCB footprints differ slightly; verify land pattern compatibility before substitution.

Q: Are Rohm BA2903 series parts fully compatible with LM2903MX?

A: BA2903 series parts (BA2903F-E2, BA2903SF-E2, BA2903YF-CE2, BA2903YF-MGE2) maintain electrical compatibility with identical supply voltage ranges, input/output current specifications, and dual open-collector comparator configuration. Package width is 0.173" versus 0.154" standard; PCB footprint adjustment may be required. Quiescent current is lower (1mA vs. 2.5mA), which is advantageous.

Q: Which substitute part offers the best temperature performance?

A: LM193DT (STMicroelectronics) and BA2903F-E2, BA2903SF-E2, BA2903YF-CE2, BA2903YF-MGE2 (Rohm Semiconductor) all extend the upper operating temperature limit to 125°C. LM193DT additionally extends the lower limit to -55°C, providing the widest temperature range (-55°C to 125°C).

Q: Is AP393AM8G-13 suitable as a substitute?

A: AP393AM8G-13 maintains electrical compatibility for supply voltage and output current specifications. However, it uses 8-MSOP packaging (0.118" width) requiring PCB redesign, operates within narrower temperature range (0°C ~ 70°C), and specifies higher input bias current (0.4µA vs. 0.25µA). Selection requires application-specific verification.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All active substitute parts listed are RoHS3 compliant, whereas the original LM2903MX is non-compliant. For new designs and regulated applications, RoHS3-compliant substitutes are required.

Q: Can LM2903DR (UMW) be used in all applications where LM2903MX is specified?

A: LM2903DR operates within reduced supply voltage range (2V ~ 30V vs. 2V ~ 36V) and narrower operating temperature window (0°C ~ 70°C vs. -40°C ~ 85°C). Substitution is valid only for applications operating within these constraints. Verify maximum supply voltage and minimum operating temperature requirements before selection.

Q: What is the significance of automotive-grade qualification (AEC-Q100)?

A: BA2903YF-CE2 and BA2903YF-MGE2 carry AEC-Q100 automotive qualification, indicating compliance with automotive reliability and quality standards. These parts are suitable for automotive applications; non-qualified alternatives may not meet automotive supply chain requirements.

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