LM2903DT Equivalent & Substitute Parts

Part Overview

The LM2903DT 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 LM2903DT is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative manufacturers offer improved inventory levels, or when design requirements permit operation within relaxed parameter tolerances. Substitution must maintain electrical compatibility across supply voltage, output characteristics, and operating temperature ranges.

Key Parameters

Parameter	LM2903DT (Main Part)
Manufacturer	Rohm Semiconductor
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 ~ 125°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903DT is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output Type: Must be Open-Collector, Rail-to-Rail
Number of Elements: Must be 2 (dual comparator)
Supply Voltage Range: Must encompass or match 2V ~ 36V (single) and ±1V ~ 18V (dual)
Input Offset Voltage: Maximum 7mV @ 5V or better
Input Bias Current: Maximum 0.25µA @ 5V or better
Output Current: Minimum 16mA @ 5V
Quiescent Current: Maximum 2.5mA

Mechanical Compatibility Requirements:

Package: 8-SOIC (0.154", 3.90mm Width) or equivalent 8-pin surface-mount package
Mounting Type: Surface Mount
Pin configuration must be functionally identical

Environmental & Compliance Requirements:

Operating Temperature: Must support -40°C ~ 125°C minimum
RoHS3 Compliance: Required
MSL Rating: 1 (Unlimited) preferred

Substitute parts are categorized as Direct Equivalents (identical electrical and mechanical specifications), Upgrades (enhanced performance or temperature range), or Similar (compatible but with parameter variations requiring design verification).

Parameter Comparison

Parameter	LM2903DT (Rohm)	LM2903DR (UMW)	LM2903D (STMicroelectronics)	LM2903DRG3 (TI)	LM2903DRG4 (TI)	LM2903HYDT (STMicroelectronics)	AS393AMTR-E1 (Diodes)
Manufacturer	Rohm Semiconductor	UMW	STMicroelectronics	Texas Instruments	Texas Instruments	STMicroelectronics	Diodes Incorporated
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Number of Elements	2	2	2	2	2	2	2
Output Type	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	2V ~ 30V, ±1V ~ ±15V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V	5mV @ 5V	7mV @ 5V	7mV @ 30V	7mV @ 30V	7mV @ 30V	3mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V	16mA @ 5V	16mA @ 5V	20mA	20mA	16mA @ 5V	16mA @ 5V
Current - Quiescent (Max)	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	1mA
Operating Temperature	-40°C ~ 125°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 85°C
Product Status	Active	Active	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

LM2903D (STMicroelectronics) and LM2903DRG3 (Texas Instruments) are direct electrical equivalents to the LM2903DT. Both maintain identical supply voltage ranges (2V ~ 36V, ±1V ~ 18V), input offset specifications (7mV @ 5V or 30V), and operating temperature range (-40°C ~ 125°C). Both are Active product status with ROHS3 compliance. These parts are suitable for direct substitution without circuit modification.

Restricted Equivalents (Conditional Substitution):

LM2903DR (UMW) meets most electrical requirements but operates only from 0°C to 70°C, which is narrower than the -40°C ~ 125°C range of the main part. This part is suitable only for applications not requiring full temperature range operation. Supply voltage is also reduced to 2V ~ 30V (single) and ±1V ~ ±15V (dual).

Upgrade Option (Enhanced Temperature Range):

LM2903HYDT (STMicroelectronics) is an automotive-grade variant with AEC-Q100 qualification and extended operating temperature to -40°C ~ 150°C. This part is suitable for applications requiring enhanced temperature performance and automotive compliance. Electrical specifications remain identical to the main part.

Obsolete Parts (Not Recommended):

LM2903DRG4 (Texas Instruments) is marked Obsolete and should not be selected for new designs despite electrical compatibility.

Similar Parts (Different Base Part Number):

AS393AMTR-E1 (Diodes Incorporated) is a functionally similar dual comparator with improved input offset voltage (3mV @ 5V) and lower quiescent current (1mA). However, it operates only to 85°C maximum and uses a different base part number (AS393 vs. LM2903). This part is suitable only when the narrower temperature range is acceptable and the improved offset voltage is beneficial.

Frequently Asked Questions (FAQ)

Q: Can LM2903DR (UMW) be used as a direct replacement for LM2903DT?

A: LM2903DR is electrically compatible for most parameters but has a restricted operating temperature range (0°C ~ 70°C vs. -40°C ~ 125°C) and reduced maximum supply voltage (2V ~ 30V single, ±1V ~ ±15V dual vs. 2V ~ 36V, ±1V ~ 18V). Use only if your application operates within these narrower limits.

Q: What is the difference between LM2903DRG3 and LM2903DRG4?

A: Both are Texas Instruments parts with identical electrical specifications. LM2903DRG3 is Active product status, while LM2903DRG4 is Obsolete. LM2903DRG3 is the recommended choice for new designs.

Q: Is LM2903HYDT suitable for automotive applications?

A: Yes. LM2903HYDT carries AEC-Q100 qualification and is specifically designed for automotive use. It maintains identical electrical performance to the main part while extending the operating temperature range to -40°C ~ 150°C.

Q: Can AS393AMTR-E1 replace LM2903DT in all applications?

A: AS393AMTR-E1 is functionally similar but not a direct replacement. It has a lower maximum operating temperature (85°C vs. 125°C), uses a different base part number, and lacks rail-to-rail output specification. Use only when the narrower temperature range is acceptable and the improved input offset voltage (3mV) is beneficial.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All listed direct and upgrade equivalents use the 8-SOIC (0.154", 3.90mm Width) surface-mount package. Similar parts from Diodes Incorporated (AS393 series) also use 8-SOIC packaging, ensuring mechanical compatibility.

Q: What is the inventory status of substitute parts?

A: LM2903D (STMicroelectronics) has 31,475 units in stock. LM2903DR and LM2903DRG3 have 105,200 and 3,867 units respectively. LM2903HYDT has 5,200 units. AS393AMTR-E1 has 232,200 units available. Verify current availability with your supplier before design commitment.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance of the main part.

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