LM2903D Equivalent & Substitute Parts

Part Overview

The LM2903D is a general-purpose dual comparator IC manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. This device features open-collector, rail-to-rail output configuration and operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM2903D is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in comparator operation, electrical performance within specified tolerances, and package compatibility.

Key Parameters

Parameter	LM2903D Value	Unit
Manufacturer	Texas Instruments	—
Product Status	Obsolete	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Number of Elements	2	—
Output Type	Open-Collector, Rail-to-Rail	—
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	V
Voltage - Input Offset (Max)	7mV @ 30V	mV
Current - Input Bias (Max)	0.25µA @ 5V	µA
Current - Output (Typ)	20mA	mA
Current - Quiescent (Max)	2.5mA	mA
Operating Temperature	-40°C ~ 125°C	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM2903D is determined by the following critical parameters:

Electrical Compatibility:

Number of comparator elements (must be 2)
Output type (must be open-collector)
Supply voltage range (must encompass or match 2V ~ 36V single supply or ±1V ~ 18V dual supply)
Input offset voltage, input bias current, and output current within acceptable tolerances
Quiescent current specifications

Package Compatibility:

Primary package: 8-SOIC (0.154", 3.90mm Width) for direct PCB layout compatibility
Alternative packages: 8-SOP variants with equivalent pin pitch and footprint compatibility

Operational Range:

Operating temperature range must support the application requirements
The LM2903D operates from -40°C to 125°C; substitutes with narrower ranges (-40°C to 85°C or 0°C to 70°C) are acceptable for applications not requiring full temperature coverage

Compliance & Status:

RoHS3 compliance required
Product status (Active, Last Time Buy, or Obsolete) affects long-term availability

Substitute parts are grouped into two categories: direct replacements maintaining identical electrical and thermal specifications, and functional equivalents with minor parameter variations within acceptable engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Status	Package	Supply Voltage (V)	Input Offset Max (mV)	Input Bias Max (µA)	Output Current Typ (mA)	Quiescent Max (mA)	Temp Range (°C)
LM2903D	Texas Instruments	Obsolete	8-SOIC	2~36, ±1~18	7 @ 30V	0.25 @ 5V	20	2.5	-40 ~ 125
LM2903DR	UMW	Active	8-SOP	2~30, ±1~±15	5 @ 5V	0.25 @ 5V	16 @ 5V	2.5	0 ~ 70
LM2903M	Texas Instruments	Last Time Buy	8-SOIC	2~36, ±1~18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 85
LM2903M/NOPB	Texas Instruments	Active	8-SOIC	2~36, ±1~18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 85
LM2903MX/NOPB	Texas Instruments	Active	8-SOIC	2~36, ±1~18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 85
AS393AMTR-E1	Diodes Incorporated	Active	8-SOIC	2~36, ±1~18	3 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85
AS393AMTR-G1	Diodes Incorporated	Active	8-SOIC	2~36, ±1~18	3 @ 1.4V	0.4 @ 5V	16	1	-40 ~ 85
AS393MTR-E1	Diodes Incorporated	Active	8-SOIC	2~36, ±1~18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85
AS393MTR-G1	Diodes Incorporated	Active	8-SOIC	2~36, ±1~18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85
BA10393F-E2	Rohm Semiconductor	Active	8-SOP	2~36, ±1~18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85
BA2903F-E2	Rohm Semiconductor	Active	8-SOP	2~36, ±1~18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 125

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM2903M/NOPB and LM2903MX/NOPB are the preferred substitutes. Both are manufactured by Texas Instruments, maintain identical electrical specifications to the LM2903D, use the same 8-SOIC package, and carry Active product status. These parts ensure seamless integration into existing designs with no PCB modifications required. The operating temperature range is -40°C to 85°C, which is narrower than the original -40°C to 125°C but sufficient for most industrial and commercial applications.

Secondary Substitutes (Functional Equivalents):

AS393MTR-E1, AS393MTR-G1, and BA2903F-E2 provide functional equivalence with minor electrical variations. The Diodes Incorporated AS393 series offers improved quiescent current (1mA versus 2.5mA) and lower input offset voltage (5mV versus 7mV), beneficial for low-power applications. BA2903F-E2 from Rohm Semiconductor maintains the full -40°C to 125°C operating range of the original part and is available in 8-SOP package. All secondary substitutes are RoHS3 compliant and carry Active product status.

Package Considerations:

The LM2903D uses 8-SOIC (0.154", 3.90mm Width). Substitutes in 8-SOP packages (BA10393F-E2, BA2903F-E2) have slightly different physical dimensions (0.173", 4.40mm Width) but maintain compatible pin pitch for most PCB layouts. Verify footprint compatibility before selecting SOP variants.

Temperature Range Selection:

For applications requiring full -40°C to 125°C operation, BA2903F-E2 is the only substitute maintaining this specification. For applications limited to -40°C to 85°C, all other substitutes are suitable.

Availability & Compliance:

All recommended substitutes are RoHS3 compliant with MSL ratings of 1 (Unlimited) or 3 (168 Hours), ensuring compatibility with standard manufacturing processes. Inventory levels vary; AS393MTR-E1 and AS393MTR-G1 offer the highest stock availability.

Frequently Asked Questions (FAQ)

Q: Can I use LM2903DR as a direct replacement for LM2903D?

A: LM2903DR is functionally compatible but not a direct replacement. It operates at 0°C to 70°C (narrower than -40°C to 125°C), uses an 8-SOP package instead of 8-SOIC, and has a reduced maximum supply voltage of ±15V (versus ±18V). Use only if your application operates within these narrower specifications.

Q: What is the difference between LM2903M and LM2903M/NOPB?

A: Both parts are electrically identical. The "/NOPB" designation indicates "No Plumbum" (lead-free) packaging. LM2903M/NOPB is the current active production variant and is preferred for new designs. LM2903M is classified as Last Time Buy.

Q: Are AS393 series parts pin-compatible with LM2903D?

A: Yes. AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 all use the 8-SOIC package with identical pin configuration. They are direct pin-for-pin replacements. The primary differences are improved quiescent current (1mA versus 2.5mA) and lower input offset voltage specifications.

Q: Can I substitute an 8-SOP package part for an 8-SOIC part on my PCB?

A: Not without PCB modification. While 8-SOP and 8-SOIC packages have the same pin count and similar pitch, the physical dimensions differ (0.173" versus 0.154" width). Verify your PCB footprint before selecting BA10393F-E2 or BA2903F-E2. If your design uses a generic 8-pin SOIC footprint, compatibility may be possible; consult your PCB layout documentation.

Q: Which substitute offers the best low-power performance?

A: AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 all feature 1mA maximum quiescent current, compared to 2.5mA for the LM2903D. This 60% reduction in quiescent current makes the AS393 series preferable for battery-powered or low-power applications.

Q: Is BA2903F-E2 suitable for high-temperature applications?

A: Yes. BA2903F-E2 maintains the full -40°C to 125°C operating range of the original LM2903D, making it the only substitute suitable for applications requiring extended high-temperature operation beyond 85°C.

Q: What does MSL rating mean, and why does it matter?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to moisture before soldering. MSL 1 (Unlimited) means no time restriction. MSL 3 (168 Hours) means the part must be soldered within 168 hours of opening the package. For standard manufacturing, MSL 1 parts are preferred for flexibility; MSL 3 parts require careful inventory management.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitutes carry RoHS3 compliance certification, ensuring compatibility with environmental regulations and modern manufacturing standards.

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