LM2903IMX Equivalent & Substitute Parts

Part Overview

The LM2903IMX is a general-purpose dual comparator IC manufactured by onsemi in 8-SOIC surface-mount packaging. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with an input offset voltage of 7mV at 5V and a maximum quiescent current of 2.5mA. The LM2903IMX is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	LM2903IMX
Manufacturer	onsemi
Type	General Purpose Comparator
Number of Elements	2
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)

Substitute Part Grouping Explanation

Substitute parts for the LM2903IMX are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Dual comparator configuration (2 elements)
Supply voltage range: 2V ~ 36V single supply or ±1V ~ ±18V dual supply
Input offset voltage: 7mV or lower at specified test conditions
Input bias current: 0.25µA or lower at 5V
Output current capability: 16mA or higher at 5V
Quiescent current: 2.5mA or lower
Operating temperature range: minimum -40°C, maximum 105°C or higher
8-SOIC surface-mount package (0.154" width, 3.90mm)
Moisture sensitivity level: 1 (Unlimited)

Substitutes are grouped into three categories: direct onsemi LM2903 variants with active product status, alternative manufacturer comparators with equivalent electrical specifications, and automotive-grade variants with AEC-Q100 qualification for applications requiring higher reliability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply (V)	Input Offset (mV)	Input Bias (µA)	Output Current (mA)	Quiescent Current (mA)	Temp Range (°C)	Package	Output Type
LM2903IMX	onsemi	Obsolete	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 105	8-SOIC	—
LM2903DR2G	onsemi	Active	2-36 / ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 105	8-SOIC	Open-Collector, Rail-to-Rail
LM2903VDR2G	onsemi	Active	2-36 / ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 125	8-SOIC	Open-Collector, Rail-to-Rail
LM393DR2G	onsemi	Active	2-36 / ±1-18	5 @ 30V	0.25 @ 5V	16 @ 5V	2.5	0 ~ 70	8-SOIC	Open-Collector, Rail-to-Rail
NCV2903DR2G	onsemi	Active	2-36 / ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 125	8-SOIC	CMOS, DTL, ECL, MOS, Open-Collector, TTL
BA10393F-E2	Rohm Semiconductor	Active	2-36 / ±1-18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85	8-SOP	Open-Collector
BA2903SF-E2	Rohm Semiconductor	Active	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 105	8-SOP	Open-Collector
BA2903YF-CE2	Rohm Semiconductor	Active	2-36 / ±1-18	4 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 125	8-SOP	Open-Collector
BA2903YF-MGE2	Rohm Semiconductor	Active	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 125	8-SOP	Open-Collector
LM193DR	UMW	Active	2-32 / ±1-16	5	0.25	16	1	-55 ~ 125	8-SOP	Open-Collector, Rail-to-Rail
LM193DT	STMicroelectronics	Active	2-36 / ±1-18	5 @ 30V	0.25 @ 5V	18 @ 5V	2.5	-55 ~ 125	8-SOIC	Open-Collector, Rail-to-Rail

Engineering Selection Recommendations

For applications currently using the obsolete LM2903IMX, the following active substitutes are recommended based on product status and compliance:

Primary Recommendation: LM2903DR2G (onsemi) This part maintains the same manufacturer lineage and electrical specifications as the LM2903IMX while offering active product status. It is available in high inventory (136,144 pcs) and is ROHS3 compliant. The 8-SOIC package matches the original footprint exactly.

Extended Temperature Alternative: LM2903VDR2G (onsemi) This variant extends the operating temperature range to -40°C ~ 125°C, providing additional thermal margin for demanding applications. It maintains all other electrical parameters and is ROHS3 compliant.

Improved Offset Voltage: LM393DR2G (onsemi) This part offers a lower input offset voltage of 5mV at 30V compared to 7mV, improving precision in sensitive applications. However, the operating temperature range is limited to 0°C ~ 70°C, which may restrict use in extended-temperature environments.

Automotive-Grade Option: NCV2903DR2G (onsemi) For applications requiring automotive qualification, this part carries AEC-Q100 certification and extends the operating temperature to -40°C ~ 125°C. It is ROHS3 compliant and maintains equivalent electrical specifications.

Alternative Manufacturers: Rohm Semiconductor BA2903 Series The BA2903SF-E2, BA2903YF-CE2, and BA2903YF-MGE2 variants from Rohm Semiconductor provide equivalent functionality with lower quiescent current (1mA vs. 2.5mA). The BA2903YF-CE2 and BA2903YF-MGE2 include automotive-grade qualification (AEC-Q100). Package dimensions differ slightly (8-SOP, 0.173" width vs. 8-SOIC, 0.154" width), requiring PCB layout verification.

Extended Temperature Range: LM193DT (STMicroelectronics) This part extends the operating temperature range to -55°C ~ 125°C and offers slightly higher output current (18mA vs. 16mA). It maintains the 8-SOIC package footprint and is ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM2903IMX with LM2903DR2G without PCB modifications? A: Yes. Both parts use the 8-SOIC package with identical 0.154" width and 3.90mm dimensions. Pin configuration and electrical specifications are compatible. No PCB layout changes are required.

Q: What is the difference between LM2903DR2G and LM393DR2G? A: Both are onsemi dual comparators in 8-SOIC packaging with equivalent supply voltage ranges and input bias currents. The LM393DR2G offers a lower input offset voltage (5mV vs. 7mV) but operates only at 0°C ~ 70°C, compared to -40°C ~ 105°C for the LM2903DR2G. Select based on your temperature requirements and offset voltage precision needs.

Q: Are Rohm Semiconductor BA2903 parts pin-compatible with the LM2903IMX? A: Yes, the BA2903 series maintains pin compatibility and electrical equivalence. However, the package dimensions differ slightly (8-SOP, 0.173" width vs. 8-SOIC, 0.154" width). Verify that your PCB layout accommodates the slightly wider package before substitution.

Q: Which substitute offers the lowest quiescent current? A: The Rohm Semiconductor BA2903 series (BA2903SF-E2, BA2903YF-CE2, BA2903YF-MGE2) and UMW LM193DR all specify a maximum quiescent current of 1mA, compared to 2.5mA for the LM2903IMX. This reduces power consumption in battery-powered applications.

Q: Do any substitutes include automotive qualification? A: Yes. The NCV2903DR2G (onsemi), BA2903YF-CE2, and BA2903YF-MGE2 (Rohm Semiconductor) all carry AEC-Q100 automotive qualification. These parts are suitable for automotive and high-reliability applications.

Q: What is the temperature range limitation of LM393DR2G? A: The LM393DR2G operates from 0°C to 70°C, which is narrower than the LM2903IMX range of -40°C to 105°C. This part is suitable only for commercial-temperature applications. For extended-temperature requirements, select LM2903DR2G, LM2903VDR2G, NCV2903DR2G, or LM193DT.

Q: Are all substitutes ROHS3 compliant? A: Yes. All active substitute parts listed are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements.

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