LM2903MX Equivalent & Substitute Parts

Part Overview

The LM2903MX is a dual general-purpose comparator IC manufactured by Rohm Semiconductor in 8-SOP surface-mount packaging. 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 "Not For New Designs," indicating end-of-life status. Finding equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this comparator topology.

Key Parameters

Parameter	Value
Manufacturer	Rohm Semiconductor
Part Number	LM2903MX
Category	Linear - Comparator
Type	General Purpose
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Supply Voltage (Single/Dual)	2V ~ 36V / ±1V ~ 18V
Input Offset Voltage (Max)	7mV @ 5V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	16mA @ 5V
Quiescent Current (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the LM2903MX are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Number of Elements: 2 comparators
Output Type: Open-Collector, Rail-to-Rail configuration
Supply Voltage Range: Minimum 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input Offset Voltage: Maximum 7mV @ 5V
Input Bias Current: Maximum 0.25µA @ 5V
Output Current: Minimum 16mA @ 5V
Quiescent Current: Maximum 2.5mA
Operating Temperature: Minimum -40°C ~ 125°C
Package: 8-SOIC surface-mount form factor
RoHS3 Compliance: Required

Direct Equivalents maintain identical electrical specifications and packaging, enabling pin-for-pin replacement without circuit modification.

Parametric Equivalents meet all critical electrical requirements but may have minor specification variations (e.g., improved input offset voltage, extended propagation delay specifications) that do not affect functional compatibility.

Similar Parts share the same base product number (LM2903 or LM193 series) and core functionality but may differ in package type (through-hole vs. surface-mount), temperature range, or output current ratings. These require design review before substitution.

Parameter Comparison

Part Number	Manufacturer	Product Status	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Mounting
LM2903MX	Rohm Semiconductor	Not For New Designs	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	8-SOIC	Surface Mount
LM2903DT	STMicroelectronics	Active	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	8-SOIC	Surface Mount
LM2903DR	UMW	Active	2V~30V / ±1V~±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	Surface Mount
LM193AH	Texas Instruments	Active	2V~36V / ±1V~18V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	TO-99-8	Through Hole
LM193DT	STMicroelectronics	Active	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-55°C ~ 125°C	8-SOIC	Surface Mount
LM193H	National Semiconductor	Active	2V~36V / ±1V~18V	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	TO-99-8	Through Hole
LM2903AVQDRG4Q1	Texas Instruments	Active	2V~36V / ±1V~18V	2mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	Surface Mount
LM2903D	STMicroelectronics	Active	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	8-SOIC	Surface Mount
LM2903DRG3	Texas Instruments	Active	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	Surface Mount
LM2903DRG4	Texas Instruments	Obsolete	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	Surface Mount

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Direct Electrical Equivalence):

LM2903DT (STMicroelectronics) is the preferred direct substitute. This part maintains identical electrical specifications to the LM2903MX, including supply voltage range, input offset voltage, input bias current, output current, and operating temperature range. The part is in active production status with ROHS3 compliance and unlimited MSL rating. Pin-for-pin replacement is supported without circuit modification.

LM2903D (STMicroelectronics, Tube packaging) provides equivalent electrical performance to LM2903DT with identical specifications. Selection between LM2903DT and LM2903D depends on packaging and quantity requirements (Cut Tape vs. Tube).

Secondary Substitutes (Active Status, Parametric Compatibility):

LM2903DRG3 and LM2903DRG4 (Texas Instruments) meet all critical electrical requirements with identical supply voltage, input bias current, and quiescent current specifications. Output current is rated at 20mA (vs. 16mA typical for the original), providing improved drive capability. Both parts support the full -40°C to 125°C operating temperature range. LM2903DRG3 is in active production; LM2903DRG4 is obsolete.

LM2903AVQDRG4Q1 (Texas Instruments, Automotive Grade, AEC-Q100 qualified) offers superior input offset voltage (2mV @ 5V) and higher output current (20mA). This part is suitable for applications requiring automotive-grade qualification and enhanced performance margins.

Alternative Substitutes (Different Package, Functional Compatibility):

LM193DT (STMicroelectronics) is a functionally compatible alternative in 8-SOIC surface-mount packaging. This part meets the supply voltage, input bias current, and quiescent current requirements. Operating temperature range extends to -55°C, providing wider low-temperature capability. Output current is rated at 18mA. This part is suitable for designs where the LM193 series base product number is acceptable.

LM193AH and LM193H (Texas Instruments and National Semiconductor, respectively) are through-hole TO-99-8 package alternatives. These parts are functionally compatible but require PCB redesign due to different mounting technology. Selection is appropriate only when surface-mount conversion is not feasible.

Not Recommended:

LM2903DR (UMW) has a reduced supply voltage range (2V~30V vs. 2V~36V) and narrower dual supply range (±1V~±15V vs. ±1V~18V). Operating temperature range is limited to 0°C ~ 70°C, which does not meet the -40°C requirement of the original specification. This part is suitable only for applications with relaxed temperature and voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2903DT be used as a direct replacement for LM2903MX without circuit modification?

A: Yes. LM2903DT is a direct electrical and mechanical equivalent. Both parts share identical pin configuration, supply voltage range (2V~36V / ±1V~18V), input offset voltage (7mV @ 5V), input bias current (0.25µA @ 5V), output current (16mA @ 5V), quiescent current (2.5mA), and operating temperature range (-40°C ~ 125°C). Pin-for-pin replacement is supported.

Q: What is the difference between LM2903DT and LM2903D?

A: Both parts are manufactured by STMicroelectronics and have identical electrical specifications. The difference is packaging format: LM2903DT is supplied in Cut Tape (CT) and Digi-Reel format, while LM2903D is supplied in Tube packaging. Selection depends on assembly process requirements and quantity needs.

Q: Why is LM2903DR not recommended as a substitute?

A: LM2903DR (UMW) has three specification limitations: reduced maximum supply voltage (30V vs. 36V), narrower dual supply range (±15V vs. ±18V), and restricted operating temperature range (0°C ~ 70°C vs. -40°C ~ 125°C). Applications requiring the full -40°C to 125°C temperature range or 36V supply voltage cannot use this part.

Q: Can I use LM193DT instead of LM2903MX?

A: LM193DT is functionally compatible and meets most electrical requirements. However, it is a different base product number (LM193 vs. LM2903). Both are dual comparators with open-collector, rail-to-rail output in 8-SOIC packaging. Verify that your application does not have specific device number requirements before substitution. LM193DT offers extended low-temperature operation (-55°C vs. -40°C).

Q: What is the advantage of LM2903AVQDRG4Q1 over LM2903DT?

A: LM2903AVQDRG4Q1 offers three advantages: (1) superior input offset voltage specification (2mV @ 5V vs. 7mV @ 5V), (2) higher output current capability (20mA vs. 16mA), and (3) automotive-grade qualification (AEC-Q100). This part is suitable for applications requiring enhanced performance margins or automotive compliance. Standard industrial applications may not require these enhancements.

Q: Are through-hole alternatives (LM193AH, LM193H) viable substitutes?

A: Through-hole alternatives are functionally compatible but require PCB redesign due to different mounting technology. LM193AH and LM193H are suitable only when surface-mount conversion is not feasible or when existing through-hole PCB layouts must be maintained. Both parts meet the electrical requirements of the original specification.

Q: What packaging options are available for LM2903 series substitutes?

A: LM2903 series substitutes are available in two surface-mount formats: 8-SOIC (standard) and 8-SOP (functionally equivalent). LM193 series alternatives are available in through-hole TO-99-8 metal can packaging. All surface-mount variants (8-SOIC/8-SOP) are pin-compatible and support direct PCB replacement.

Q: Is RoHS3 compliance maintained across all substitute parts?

A: Yes. All recommended substitute parts (LM2903DT, LM2903D, LM2903DRG3, LM2903AVQDRG4Q1, LM193DT, LM193AH, LM193H) are ROHS3 compliant. Moisture sensitivity level (MSL) is rated as 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

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