LM2903DG4 Equivalent & Substitute Parts

Part Overview

The LM2903DG4 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, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM2903 series base product remains widely available through multiple manufacturers and packaging options, enabling straightforward substitution based on electrical and mechanical compatibility parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903DG4
Manufacturer	Texas Instruments
Category	Linear
Description	IC COMPARATOR 2 DIFF 8SOIC
Type	General Purpose
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (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
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903DG4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Number of Elements: Must be 2 (dual comparator)
Output Type: Must be Open-Collector or Open-Collector, Rail-to-Rail
Voltage Supply Range: Must support 2V ~ 36V single supply or ±1V ~ 18V dual supply minimum
Input Bias Current: Must not exceed 0.25µA @ 5V
Quiescent Current: Must not exceed 2.5mA
Operating Temperature: Must support -40°C minimum and 85°C or higher maximum

Mechanical Compatibility Requirements:

Package Type: 8-SOIC or 8-SOP (functionally equivalent surface-mount packages)
Pin Configuration: Must maintain identical pinout for direct PCB substitution
Mounting Type: Surface Mount only

Compliance Requirements:

RoHS3 Compliant
MSL Rating: 1 (Unlimited) or 3 (168 Hours) acceptable

Substitute parts are grouped into two categories: Direct Pin-Compatible Substitutes (identical 8-SOIC package, same pinout) and Package-Variant Substitutes (8-SOP package, functionally equivalent but requiring PCB layout verification).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply (±)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	MSL
LM2903DG4	Texas Instruments	Obsolete	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	1
LM2903DR	UMW	Active	2V~30V, ±1V~±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOP	1
LM2903M	Texas Instruments	Last Time Buy	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	8-SOIC	1
LM2903M/NOPB	Texas Instruments	Active	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	8-SOIC	1
LM2903MX/NOPB	Texas Instruments	Active	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	8-SOIC	1
AS393AMTR-E1	Diodes Incorporated	Active	2V~36V, ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	1
AS393AMTR-G1	Diodes Incorporated	Active	2V~36V, ±1V~18V	3mV @ 1.4V	0.4µA @ 5V	16mA	1mA	-40°C ~ 85°C	8-SOIC	1
AS393MTR-E1	Diodes Incorporated	Active	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	3
AS393MTR-G1	Diodes Incorporated	Active	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	3
BA10393F-E2	Rohm Semiconductor	Active	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOP	1
BA2903F-E2	Rohm Semiconductor	Active	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	8-SOP	1

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Specifications & Package):

LM2903M/NOPB and LM2903MX/NOPB are the primary recommended substitutes. Both are manufactured by Texas Instruments, maintain identical electrical specifications to the LM2903DG4, and use the same 8-SOIC package. LM2903M/NOPB carries Active product status with unlimited inventory availability, making it the optimal choice for new designs and ongoing production. LM2903MX/NOPB offers identical performance in cut-tape packaging format.

Tier 2 - Electrical Equivalent with Extended Temperature Range:

BA2903F-E2 (Rohm Semiconductor) provides identical supply voltage range and operating temperature span (-40°C ~ 125°C) matching the original LM2903DG4. This part uses an 8-SOP package variant (0.173" width versus 0.154" width) requiring PCB layout verification but offering superior temperature performance for extended-range applications.

Tier 3 - Electrical Equivalent with Reduced Quiescent Current:

AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 (Diodes Incorporated) deliver improved quiescent current performance (1mA maximum versus 2.5mA) while maintaining full supply voltage compatibility. These parts are available in both tape-and-reel and cut-tape formats. AS393MTR-E1 and AS393MTR-G1 carry MSL-3 moisture sensitivity ratings requiring controlled storage conditions.

Tier 4 - Package-Variant Substitutes:

LM2903DR (UMW) and BA10393F-E2 (Rohm Semiconductor) use 8-SOP packages and require PCB layout verification. LM2903DR operates at reduced temperature range (0°C ~ 70°C) and lower maximum supply voltage (±15V dual supply), limiting applicability to commercial-temperature designs. BA10393F-E2 maintains full temperature and voltage specifications.

All recommended substitutes comply with ROHS3 requirements and maintain MSL-1 or MSL-3 moisture sensitivity ratings.

Frequently Asked Questions (FAQ)

Q: Can LM2903M/NOPB directly replace LM2903DG4 without PCB modifications?

A: Yes. LM2903M/NOPB uses the identical 8-SOIC package with matching pinout and electrical specifications. No PCB layout changes are required for direct substitution.

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

A: Both are 8-pin surface-mount packages with identical pinout and electrical function. The primary difference is physical width: 8-SOIC measures 0.154" (3.90mm) while 8-SOP measures 0.173" (4.40mm). PCB footprints are not interchangeable without layout modification.

Q: Why do some substitutes show lower quiescent current (1mA vs 2.5mA)?

A: AS393 series parts from Diodes Incorporated feature improved power efficiency. Lower quiescent current reduces standby power consumption without affecting functional performance or electrical compatibility.

Q: Is BA2903F-E2 suitable for applications requiring -40°C to 125°C operation?

A: Yes. BA2903F-E2 supports the full -40°C to 125°C temperature range, matching the original LM2903DG4 specification. It uses an 8-SOP package requiring PCB verification.

Q: What does MSL-3 (168 Hours) mean for AS393MTR parts?

A: MSL-3 indicates the component requires controlled humidity storage with a maximum floor-life of 168 hours after moisture exposure. Standard moisture-barrier packaging and desiccant storage are required. MSL-1 parts (LM2903M/NOPB, BA2903F-E2) have unlimited floor-life.

Q: Can I use LM2903DR as a substitute in all applications?

A: LM2903DR operates at reduced temperature range (0°C ~ 70°C) and lower dual supply voltage (±15V maximum). It is suitable only for commercial-temperature designs with supply voltages within these limits. Extended-temperature or high-voltage applications require Tier 1 or Tier 2 alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification, meeting lead-free and hazardous substance restrictions.

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