LM2903MX Equivalent & Substitute Parts

Part Overview

The LM2903MX 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 LM2903MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903MX
Manufacturer	onsemi
Category	Linear Comparator
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM2903MX is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

Package type: 8-SOIC surface-mount configuration
Number of comparator elements: 2
Output type: Open-Collector capability
Supply voltage range: Minimum 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage: Maximum 7mV or lower
Input bias current: Maximum 0.25µA
Output current: Minimum 16mA typical
Quiescent current: Maximum 2.5mA or lower
Operating temperature range: Minimum -40°C ~ 105°C or wider

Substitute parts are grouped into two categories:

Direct Substitutes (onsemi LM2903 Series): Parts maintaining identical electrical specifications and the same base product number (LM2903), with active product status and improved availability.

Cross-Manufacturer Equivalents: Parts from alternative manufacturers (Diodes Incorporated, Rohm Semiconductor, UMW) meeting all critical electrical parameters and package requirements, offering functional equivalence with different supply chain options.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Supply Voltage	Input Offset (Max)	Output Type	Operating Temp	Quiescent Current (Max)
LM2903MX	onsemi	Obsolete	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	Open-Collector, Rail-to-Rail	-40°C ~ 105°C	2.5mA
LM2903DR2G	onsemi	Active	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	Open-Collector, Rail-to-Rail	-40°C ~ 105°C	2.5mA
LM2903VDR2G	onsemi	Active	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	Open-Collector, Rail-to-Rail	-40°C ~ 125°C	2.5mA
LM393DR2G	onsemi	Active	8-SOIC	2V~36V, ±1V~18V	5mV @ 30V	Open-Collector, Rail-to-Rail	0°C ~ 70°C	2.5mA
NCV2903DR2G	onsemi	Active	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 125°C	2.5mA
LM2903DR	UMW	Active	8-SOIC	2V~30V, ±1V~±15V	5mV @ 5V	Open-Collector, Rail-to-Rail	0°C ~ 70°C	2.5mA
AS393AMTR-E1	Diodes Incorporated	Active	8-SOIC	2V~36V, ±1V~18V	3mV @ 5V	Open-Collector	-40°C ~ 85°C	1mA
AS393MTR-E1	Diodes Incorporated	Active	8-SOIC	2V~36V, ±1V~18V	5mV @ 5V	Open-Collector	-40°C ~ 85°C	1mA
AS393MTR-G1	Diodes Incorporated	Active	8-SOIC	2V~36V, ±1V~18V	5mV @ 5V	Open-Collector	-40°C ~ 85°C	1mA
BA10393F-E2	Rohm Semiconductor	Active	8-SOIC (0.173", 4.40mm)	2V~36V, ±1V~18V	5mV @ 5V	Open-Collector	-40°C ~ 85°C	1mA
BA2903SF-E2	Rohm Semiconductor	Active	8-SOIC (0.173", 4.40mm)	2V~36V, ±1V~18V	7mV @ 5V	Open-Collector	-40°C ~ 105°C	1mA

Engineering Selection Recommendations

Primary Recommendation: LM2903DR2G (onsemi)

LM2903DR2G is the direct active-status equivalent from the original manufacturer. It maintains identical electrical specifications to the LM2903MX, operates across the full -40°C to 105°C temperature range, and is ROHS3 compliant with MSL 1 rating. This part offers the highest design continuity and supply chain reliability for direct replacement applications.

Extended Temperature Option: LM2903VDR2G (onsemi)

For applications requiring extended upper temperature operation to 125°C, LM2903VDR2G provides the same electrical performance as LM2903DR2G with expanded thermal capability. This variant maintains all other specifications and compliance certifications.

Automotive-Grade Alternative: NCV2903DR2G (onsemi)

NCV2903DR2G is qualified to AEC-Q100 automotive standards with -40°C to 125°C operating range. This part is suitable for automotive and industrial applications requiring automotive-grade qualification, with propagation delay specification of 1.3µs typical.

Cross-Manufacturer Alternatives: AS393 Series (Diodes Incorporated)

AS393MTR-E1 and AS393MTR-G1 provide functional equivalence with identical supply voltage range and package configuration. Both maintain open-collector output and meet the 2V to 36V supply requirement. AS393MTR-E1 offers lower quiescent current (1mA vs. 2.5mA) and is available in higher inventory quantities. MSL rating is 3 (168 Hours) for both variants.

Rohm Semiconductor Options: BA10393F-E2 and BA2903SF-E2

BA10393F-E2 and BA2903SF-E2 provide cross-manufacturer substitution with full supply voltage compatibility. Both feature reduced quiescent current (1mA) and are ROHS3 compliant. Package dimensions differ slightly (0.173" vs. 0.154" width), requiring PCB layout verification. BA2903SF-E2 extends operating temperature to 105°C, matching the original LM2903MX specification.

Limited Scope Substitute: LM2903DR (UMW)

LM2903DR from UMW meets core electrical requirements but operates only to 0°C minimum (vs. -40°C) and 70°C maximum (vs. 105°C). Supply voltage is limited to 2V~30V single (vs. 2V~36V). This part is suitable only for commercial-temperature applications with reduced supply voltage headroom.

Frequently Asked Questions (FAQ)

Q: Can LM2903DR2G directly replace LM2903MX 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 for direct substitution.

Q: What is the difference between LM2903DR2G and LM2903VDR2G?

A: Both parts are electrically identical with identical supply voltage and input offset specifications. LM2903VDR2G extends the maximum operating temperature from 105°C to 125°C. Select LM2903VDR2G only if your application requires operation above 105°C.

Q: Are Diodes Incorporated AS393 parts pin-compatible with LM2903MX?

A: Yes. AS393MTR-E1 and AS393MTR-G1 share the same 8-SOIC pinout and electrical interface. Both support the full 2V to 36V supply voltage range and open-collector output configuration. Functional compatibility is confirmed.

Q: Why do Rohm BA10393F-E2 and BA2903SF-E2 have different package widths?

A: BA10393F-E2 and BA2903SF-E2 use 8-SOP packaging with 0.173" width versus the standard 8-SOIC 0.154" width. While electrically compatible, PCB footprint verification is required before substitution. Consult package datasheets for exact pad dimensions.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: LM2903MX and most onsemi variants carry MSL 1 (unlimited shelf life). Diodes Incorporated AS393 parts carry MSL 3 (168-hour floor life after bag opening). MSL 3 parts require controlled storage and handling procedures. For high-volume production, verify moisture control protocols with your assembly partner.

Q: Can LM2903DR from UMW replace LM2903MX in all applications?

A: No. LM2903DR operates only from 0°C to 70°C (vs. -40°C to 105°C) and supports maximum 30V single supply (vs. 36V). Use this part only in commercial-temperature applications with supply voltages not exceeding 30V.

Q: Is NCV2903DR2G suitable for non-automotive applications?

A: Yes. NCV2903DR2G meets all LM2903MX electrical specifications and exceeds temperature range to 125°C. AEC-Q100 qualification is a superset of commercial requirements. This part is suitable for any application within its specified operating parameters.

Q: What packaging options are available for LM2903 equivalents?

A: All recommended substitutes are available in 8-SOIC surface-mount packages with 0.154" width, except Rohm variants (0.173" width). Cut Tape (CT) and Digi-Reel packaging is standard for high-volume procurement. Verify packaging format with your supplier.

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