LM2903DG Equivalent & Substitute Parts

Part Overview

The LM2903DG is a dual general-purpose comparator IC 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 LM2903DG is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903DG
Manufacturer	onsemi
Category	Linear
Description	IC COMPARATOR 2 GEN PUR 8SOIC
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 @ 30V
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM2903DG is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Package type: 8-SOIC surface-mount configuration
Number of comparator elements: 2
Output configuration: Open-Collector, Rail-to-Rail
Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage: Maximum 7mV specification
Input bias current: Maximum 0.25µA @ 5V
Output current: Minimum 16mA @ 5V
Quiescent current: Maximum 2.5mA
Operating temperature range: Minimum -40°C to +105°C

Substitute parts are grouped into three categories based on their relationship to the LM2903DG:

Direct Substitutes: Parts meeting all electrical specifications and package requirements with active product status.

Upgrade Substitutes: Parts exceeding baseline specifications (higher output current, extended temperature range) while maintaining full backward compatibility.

Similar Substitutes: Parts from alternative manufacturers meeting core electrical parameters with minor specification variations that remain within acceptable application tolerances.

Parameter Comparison

Parameter	LM2903DG (onsemi)	LM2903DT (STMicroelectronics)	LM2903MX/NOPB (Texas Instruments)	LM2903WDT (STMicroelectronics)	AS393AMTR-E1 (Diodes)	AS393MTR-E1 (Diodes)	BA2903SF-E2 (Rohm)
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.173", 4.40mm)
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	Open-Collector	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	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 @ 30V	7mV @ 5V	7mV @ 30V	7mV @ 30V	3mV @ 5V	5mV @ 5V	7mV @ 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	16mA @ 5V	16mA @ 5V	16mA @ 5V
Current - Quiescent (Max)	2.5mA	2.5mA	2.5mA	2.5mA	1mA	1mA	1mA
Operating Temperature	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitutes (Recommended for Immediate Replacement):

LM2903DT (STMicroelectronics) and LM2903MX/NOPB (Texas Instruments) are direct functional equivalents with active product status. Both maintain identical electrical specifications and 8-SOIC packaging. LM2903DT extends operating temperature to -40°C ~ 125°C and carries ROHS3 compliance. LM2903MX/NOPB operates to -40°C ~ 85°C. Selection depends on temperature range requirements for the application.

Upgrade Substitute:

LM2903WDT (STMicroelectronics) provides enhanced output current capability (20mA typical versus 16mA) and extended temperature range (-40°C ~ 125°C). This part is suitable for applications requiring higher drive capability while maintaining full backward compatibility. ROHS3 compliance is confirmed.

Alternative Substitutes:

AS393AMTR-E1, AS393MTR-E1, and BA2903SF-E2 meet core electrical requirements from alternative manufacturers (Diodes Incorporated and Rohm Semiconductor). These parts feature lower quiescent current (1mA maximum) and improved input offset voltage specifications. AS393MTR-E1 carries MSL 3 rating (168 hours), requiring controlled moisture exposure during storage and handling. BA2903SF-E2 uses a slightly wider 8-SOP package (0.173" versus 0.154" width) and operates to -40°C ~ 105°C.

All substitute parts maintain REACH compliance and EAR99 export classification consistent with the original LM2903DG.

Frequently Asked Questions (FAQ)

Q: Can LM2903DT directly replace LM2903DG in existing designs?

A: Yes. LM2903DT meets all electrical specifications of the LM2903DG and uses identical 8-SOIC packaging. The extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 105°C) provides additional margin. No circuit modifications are required.

Q: What is the difference between LM2903DT and LM2903WDT?

A: Both are STMicroelectronics products in 8-SOIC packages with identical supply voltage and temperature ranges. LM2903WDT provides higher output current (20mA typical versus 16mA), making it suitable for applications requiring greater load drive capability. Electrical compatibility is maintained.

Q: Are Diodes Incorporated AS393 series parts fully compatible with LM2903DG?

A: AS393AMTR-E1, AS393MTR-E1, and AS393MTR-G1 meet the core electrical requirements (2V ~ 36V supply, ±1V ~ ±18V dual supply, open-collector output, 16mA output current). All use 8-SOIC packaging. Lower quiescent current (1mA versus 2.5mA) and improved input offset voltage are beneficial. Operating temperature range is -40°C ~ 85°C, which is narrower than the original part.

Q: What does MSL 3 rating mean for AS393MTR-E1?

A: MSL 3 (Moisture Sensitivity Level 3) indicates the component requires controlled moisture exposure for 168 hours maximum after packaging. This part must be stored in dry conditions and baked before reflow soldering if moisture absorption occurs. MSL 1 parts (LM2903DT, LM2903MX/NOPB, LM2903WDT) have unlimited shelf life without moisture control.

Q: Can BA2903SF-E2 be used as a direct replacement despite different package width?

A: BA2903SF-E2 uses an 8-SOP package with 0.173" width versus the standard 0.154" width of LM2903DG. While electrical specifications align, PCB footprint compatibility must be verified. The wider package may not fit existing 8-SOIC land patterns. Confirm mechanical fit before design implementation.

Q: Which substitute part offers the best performance improvement?

A: LM2903WDT provides the most significant upgrade with 20mA output current (25% higher than 16mA baseline) and extended temperature range to 125°C. For low-power applications, AS393 series parts offer reduced quiescent current (1mA versus 2.5mA), reducing power consumption by 60%.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (LM2903DT, LM2903MX/NOPB, LM2903WDT, AS393 series, BA2903SF-E2) carry ROHS3 compliance certification. The original LM2903DG RoHS status is not specified due to its obsolete classification.

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