LM2903NG Equivalent & Substitute Parts

Part Overview

The LM2903NG is a dual general-purpose comparator IC manufactured by onsemi in 8-PDIP through-hole 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 LM2903NG is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional equivalence while offering active product status and improved availability.

Key Parameters

Parameter	LM2903NG Value
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
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903NG is determined by the following critical parameters:

Functional Equivalence Requirements:

Dual comparator configuration (2 elements)
Open-collector or open-collector/open-drain output topology
Rail-to-rail output capability
Supply voltage range: minimum 2V to 36V (single) or ±1V to ±18V (dual)
Input offset voltage: 7mV or lower
Input bias current: 0.25µA or lower
Output current capability: 16mA or higher
Quiescent current: 2.5mA or lower

Package Compatibility: Through-hole 8-DIP packages are directly pin-compatible. Surface-mount alternatives (8-SOIC, 8-MSOP, 8-TSSOP, 8-DSBGA) require PCB redesign but maintain electrical equivalence.

Product Status: All listed substitutes maintain active product status, ensuring long-term availability and supply chain reliability compared to the obsolete LM2903NG.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
LM2903NG	onsemi	8-DIP	Through Hole	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	Obsolete
AS393P-E1	Diodes Incorporated	8-DIP	Through Hole	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Active
LM193DR	UMW	8-SOIC	Surface Mount	2V~32V, ±1V~16V	5mV	250nA	16mA	1mA	-55°C ~ 125°C	Active
LM2903DGKR	Rohm Semiconductor	8-MSOP	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2903HYDT	STMicroelectronics	8-SOIC	Surface Mount	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 150°C	Active
LM2903ITLX/NOPB	Texas Instruments	8-DSBGA	Surface Mount	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM2903N/NOPB	Texas Instruments	8-DIP	Through Hole	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM2903P	Texas Instruments	8-DIP	Through Hole	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903WYPT	STMicroelectronics	8-TSSOP	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM293ADGKR	Texas Instruments	8-VSSOP	Surface Mount	2V~36V, ±1V~18V	2mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C ~ 85°C	Active
LM293P	Texas Instruments	8-DIP	Through Hole	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (8-DIP Through-Hole):

For applications requiring no PCB modification, select from through-hole 8-DIP packages: AS393P-E1, LM2903N/NOPB, LM2903P, or LM293P. All maintain identical pinout and footprint compatibility with the LM2903NG. LM2903N/NOPB and LM2903P offer identical electrical specifications to the original part with extended operating temperature ranges (-40°C to 85°C and -40°C to 125°C respectively) and active product status with RoHS3 compliance.

Surface-Mount Alternatives:

For new designs or PCB redesigns, surface-mount packages provide improved thermal performance and reduced board space. LM2903HYDT (8-SOIC, STMicroelectronics, AEC-Q100 qualified) and LM2903WYPT (8-TSSOP, STMicroelectronics, AEC-Q100 qualified) support automotive applications with extended temperature ranges. LM2903DGKR (8-MSOP, Rohm Semiconductor) offers the widest operating temperature range (-40°C to 125°C). LM193DR (8-SOIC, UMW) provides enhanced input bias current performance (250nA).

Compliance Considerations:

All substitute parts maintain REACH Unaffected status and RoHS3 compliance. LM2903HYDT and LM2903WYPT carry AEC-Q100 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can AS393P-E1 replace LM2903NG in existing through-hole designs?

A: Yes. AS393P-E1 maintains identical 8-DIP pinout and footprint. Electrical parameters meet or exceed LM2903NG specifications: input offset voltage is lower (5mV vs 7mV), quiescent current is lower (1mA vs 2.5mA), and supply voltage range is identical. Operating temperature range is -40°C to 85°C versus -40°C to 105°C for the original part.

Q: What is the difference between LM2903P and LM293P?

A: Both are 8-DIP through-hole packages from Texas Instruments with identical supply voltage and operating temperature ranges. LM2903P specifies 16mA typical output current, while LM293P specifies 20mA. LM293P has lower maximum input offset voltage (5mV vs 7mV at 30V). Both are active products with RoHS3 compliance.

Q: Are surface-mount alternatives electrically equivalent to the through-hole LM2903NG?

A: Yes. Surface-mount packages (8-SOIC, 8-MSOP, 8-TSSOP, 8-DSBGA) maintain identical or superior electrical specifications. Substitution requires PCB redesign to accommodate different package footprints. All listed surface-mount alternatives meet the functional requirements of the LM2903NG.

Q: Which substitute offers the best input offset voltage performance?

A: LM293ADGKR (Texas Instruments, 8-VSSOP) specifies 2mV maximum input offset voltage at 30V, the lowest among all listed substitutes. This part requires surface-mount PCB design and operates within -25°C to 85°C temperature range.

Q: Do all substitutes support the full ±1V to ±18V dual supply voltage range?

A: All listed substitutes support ±1V to ±18V dual supply operation. LM193DR (UMW) specifies a slightly reduced range of ±1V to ±16V. Single supply operation is supported at 2V to 36V across all parts, with LM193DR rated to 2V to 32V.

Q: What is the significance of AEC-Q100 qualification on LM2903HYDT and LM2903WYPT?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and qualification. These parts are suitable for automotive applications requiring enhanced reliability and temperature cycling validation. Both parts extend operating temperature to -40°C to 150°C (LM2903HYDT) and -40°C to 125°C (LM2903WYPT).

Q: Can LM2903ITLX/NOPB (8-DSBGA) be used in high-volume production?

A: Yes. LM2903ITLX/NOPB is an active product from Texas Instruments in 8-DSBGA ball grid array packaging. This package requires specialized assembly equipment and PCB design. It is suitable for high-volume production with active product status and RoHS3 compliance. Inventory availability is 4,100 pieces.

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