LM2903VDG Equivalent & Substitute Parts

Part Overview

The LM2903VDG 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 LM2903VDG is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	LM2903VDG
Category	Linear Comparator
Type	General Purpose
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903VDG is determined by the following critical parameters:

Package Type: 8-SOIC surface-mount package (0.154", 3.90mm width) is the primary mechanical constraint
Output Configuration: Open-collector output with rail-to-rail capability
Supply Voltage Range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Number of Comparators: Dual-element configuration (2 comparators per IC)
Input Offset Voltage: Maximum 7mV specification
Input Bias Current: Maximum 0.25µA @ 5V
Quiescent Current: Maximum 2.5mA
Operating Temperature Range: -40°C ~ 125°C

Substitute parts are classified into two categories:

Direct Substitutes maintain identical electrical specifications and package format, enabling pin-for-pin replacement without circuit modification:

LM2903AVQDR (Texas Instruments)
LM2903VQDR (Rohm Semiconductor)
LM2903WDT (STMicroelectronics)

Similar Substitutes share core functional characteristics and package compatibility but may have minor parameter variations or different temperature ratings:

AP393SG-13 (Diodes Incorporated)
AS393AMTR-E1 (Diodes Incorporated)
AS393AMTR-G1 (Diodes Incorporated)
AS393MTR-E1 (Diodes Incorporated)
AS393MTR-G1 (Diodes Incorporated)
BA2903YF-CE2 (Rohm Semiconductor)
LM193AH (Texas Instruments)

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Supply (V)	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Operating Temp (°C)	Package
LM2903VDG	onsemi	Obsolete	Open-Collector, Rail-to-Rail	2-36, ±1-18	7mV @ 30V	0.25µA @ 5V	2.5mA	-40 ~ 125	8-SOIC
LM2903AVQDR	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	2mV @ 32V	0.25µA @ 5V	2.5mA	-40 ~ 125	8-SOIC
LM2903VQDR	Rohm Semiconductor	Obsolete	Open-Collector, Rail-to-Rail	2-36, ±1-18	7mV @ 5V	0.25µA @ 5V	2.5mA	-40 ~ 125	8-SOIC
LM2903WDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	7mV @ 30V	0.25µA @ 5V	2.5mA	-40 ~ 125	8-SOIC
AP393SG-13	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	5mV @ 5V	0.25µA @ 5V	2.5mA	0 ~ 70	8-SOIC
AS393AMTR-E1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	3mV @ 5V	0.25µA @ 5V	1mA	-40 ~ 85	8-SOIC
AS393AMTR-G1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	3mV @ 1.4V	0.4µA @ 5V	1mA	-40 ~ 85	8-SOIC
AS393MTR-E1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	5mV @ 5V	0.25µA @ 5V	1mA	-40 ~ 85	8-SOIC
AS393MTR-G1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	5mV @ 5V	0.25µA @ 5V	1mA	-40 ~ 85	8-SOIC
BA2903YF-CE2	Rohm Semiconductor	Active	Open-Collector	2-36, ±1-18	4mV @ 5V	0.25µA @ 5V	1mA	-40 ~ 125	8-SOIC
LM193AH	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	2mV @ 30V	0.1µA @ 5V	2.5mA	-55 ~ 125	TO-99-8

Engineering Selection Recommendations

For Direct Pin-for-Pin Replacement (Active Product Status):

LM2903AVQDR (Texas Instruments) is the primary recommended substitute. It maintains identical supply voltage range, package format, and quiescent current specifications while offering improved input offset voltage performance (2mV vs. 7mV). Product status is active with ROHS3 compliance and unlimited moisture sensitivity rating.

LM2903WDT (STMicroelectronics) provides an alternative direct substitute with matching electrical specifications and active product status. ROHS3 compliance and unlimited MSL rating support long-term production availability.

For Extended Temperature Range Applications:

LM193AH (Texas Instruments) extends the operating temperature range to -55°C ~ 125°C, suitable for military or extreme environment applications. Package format is TO-99-8 (through-hole), requiring PCB layout modification. Product status is active with ROHS3 compliance.

For Cost-Optimized Designs with Relaxed Temperature Requirements:

AS393MTR-E1 or AS393MTR-G1 (Diodes Incorporated) offer active product status with reduced quiescent current (1mA vs. 2.5mA), beneficial for battery-powered applications. Operating temperature range is -40°C ~ 85°C. Both parts maintain 8-SOIC package compatibility and ROHS3 compliance.

For Automotive-Grade Applications:

BA2903YF-CE2 (Rohm Semiconductor) carries AEC-Q100 automotive qualification with -40°C ~ 125°C operating range. Active product status and ROHS3 compliance support automotive supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2903AVQDR directly replace LM2903VDG without circuit modification?

A: Yes. LM2903AVQDR maintains identical pin configuration, supply voltage range (2V ~ 36V, ±1V ~ ±18V), output type (open-collector, rail-to-rail), and package format (8-SOIC). Input offset voltage is improved (2mV vs. 7mV), which is a beneficial change. No circuit redesign is required.

Q: What is the primary difference between direct substitutes and similar substitutes?

A: Direct substitutes (LM2903AVQDR, LM2903VQDR, LM2903WDT) maintain identical electrical specifications and package format. Similar substitutes (AS393 series, AP393SG-13, BA2903YF-CE2) share core functionality and 8-SOIC packaging but may have variations in input offset voltage, quiescent current, or operating temperature range. Selection depends on application-specific requirements.

Q: Why is LM193AH listed as a substitute if it uses a different package (TO-99-8)?

A: LM193AH is functionally equivalent with superior specifications (2mV input offset, 0.1µA input bias, extended temperature range to -55°C). However, it requires through-hole mounting versus surface-mount, necessitating PCB layout redesign. It is suitable for applications where package change is acceptable and extended temperature performance is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status. The original LM2903VDG does not specify RoHS status, but all active alternatives meet current RoHS3 requirements.

Q: What is the significance of MSL (Moisture Sensitivity Level) rating?

A: MSL-1 (unlimited) indicates the component can be stored indefinitely without moisture bake-out requirements. MSL-3 (168 hours) requires moisture bake-out procedures if storage exceeds 168 hours in high-humidity environments. For production planning, MSL-1 parts (LM2903AVQDR, LM2903WDT, BA2903YF-CE2) offer simplified handling logistics.

Q: Can AS393 series parts replace LM2903VDG in applications requiring -40°C ~ 125°C operation?

A: AS393 series parts operate only to -40°C ~ 85°C, making them unsuitable for applications requiring the full -40°C ~ 125°C range. For extended temperature requirements, use LM2903AVQDR, LM2903WDT, BA2903YF-CE2, or LM193AH.

Q: What is the impact of reduced quiescent current in AS393 variants?

A: AS393 series parts consume 1mA quiescent current versus 2.5mA in the original LM2903VDG. This 60% reduction benefits battery-powered and low-power applications. For applications with no power consumption constraints, this difference is negligible.

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