LM2903VQDR Equivalent & Substitute Parts

Part Overview

The LM2903VQDR is a general-purpose dual comparator IC manufactured by Rohm Semiconductor in 8-SOIC 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 part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903VQDR
Manufacturer	Rohm Semiconductor
Product Category	Linear - Comparator
Type	General Purpose Dual Comparator
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 @ 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	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM2903VQDR is determined by the following critical parameters:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
Open-collector, rail-to-rail output type
Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input offset voltage maximum: 7mV @ 5V or better
Input bias current maximum: 0.25µA @ 5V or better
Output current capability: 16mA @ 5V minimum
Quiescent current maximum: 2.5mA
Operating temperature range: -40°C ~ 125°C

Mechanical Compatibility Requirements:

Package type: 8-SOIC surface-mount
Pin configuration: 8-pin SOIC with 0.154" (3.90mm) width
Mounting type: Surface mount

Compliance Requirements:

ROHS3 compliant
MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories: Direct Substitutes (identical package and pinout) and Similar Parts (different package but equivalent electrical function).

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp
LM2903VQDR	Rohm Semiconductor	Obsolete	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C
LM2903DT	STMicroelectronics	Active	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C
LM2903D	STMicroelectronics	Active	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C
LM2903DRG3	Texas Instruments	Active	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C
LM2903DRG4	Texas Instruments	Obsolete	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C
LM2903DR	UMW	Active	8-SOP	2V~30V, ±1V~±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C
LM193DT	STMicroelectronics	Active	8-SOIC	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-55°C ~ 125°C
LM193AH/NOPB	Texas Instruments	Active	TO-99-8	2V~36V, ±1V~18V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C
LM2903AVQPWR	Texas Instruments	Active	8-TSSOP	2V~36V, ±1V~18V	2mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (8-SOIC Package):

LM2903DT (STMicroelectronics) and LM2903D (STMicroelectronics) are the primary direct substitutes. Both are active products with identical electrical specifications to the LM2903VQDR, including supply voltage range, input offset voltage, and operating temperature. Both are ROHS3 compliant with MSL rating 1.

LM2903DRG3 (Texas Instruments) is an active direct substitute with identical package and pinout. It offers slightly higher output current capability (20mA typical) and maintains the same supply voltage and temperature range. This part is ROHS3 compliant.

Package-Variant Substitutes:

LM2903DR (UMW) uses 8-SOP packaging instead of 8-SOIC. While pin-compatible in function, the physical package differs. This part has a reduced supply voltage range (2V~30V single, ±1V~±15V dual) and narrower operating temperature range (0°C ~ 70°C), making it unsuitable for applications requiring the full -40°C ~ 125°C range.

LM2903AVQPWR (Texas Instruments) uses 8-TSSOP packaging. It is an active product with improved input offset voltage (2mV @ 5V) and higher output current (20mA). The package footprint differs from 8-SOIC, requiring PCB layout changes.

Similar-Function Alternatives:

LM193DT (STMicroelectronics) and LM193AH/NOPB (Texas Instruments) are single-comparator variants with extended temperature range (-55°C ~ 125°C). LM193AH/NOPB uses through-hole TO-99-8 packaging, requiring different PCB design. These parts are suitable only if dual-comparator functionality is not required.

Recommended Selection Criteria:

For direct replacement without PCB modification, select LM2903DT or LM2903D from STMicroelectronics. Both maintain full electrical and thermal compatibility with the obsolete LM2903VQDR.

For applications requiring higher output current or improved input offset specifications, LM2903DRG3 (Texas Instruments) is an active alternative in the same 8-SOIC package.

All recommended substitutes are ROHS3 compliant with MSL rating 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can LM2903DT be used as a direct replacement for LM2903VQDR?

A: Yes. LM2903DT is a direct pin-compatible substitute. Both use 8-SOIC packaging with identical pinout. Electrical specifications are equivalent: 2V~36V supply range, 7mV input offset, 0.25µA input bias, 16mA output current, and -40°C ~ 125°C operating temperature. No PCB modifications are required.

Q: What is the difference between LM2903DT and LM2903D?

A: Both are STMicroelectronics products in 8-SOIC packaging with identical electrical specifications. LM2903DT is supplied in cut tape and digi-reel packaging, while LM2903D is supplied in tube packaging. Electrical performance and pin configuration are identical.

Q: Why is LM2903DR not recommended as a direct substitute?

A: LM2903DR uses 8-SOP packaging instead of 8-SOIC, requiring PCB layout changes. Additionally, it has a reduced supply voltage range (2V~30V single, ±1V~±15V dual) and narrower operating temperature range (0°C ~ 70°C), making it incompatible with applications requiring the full -40°C ~ 125°C specification of the LM2903VQDR.

Q: Can I use LM193DT instead of LM2903VQDR?

A: LM193DT is a single-comparator device, while LM2903VQDR is a dual-comparator device. LM193DT is suitable only if your application requires only one comparator. Both use 8-SOIC packaging and have compatible electrical specifications within their respective configurations.

Q: What is the advantage of LM2903AVQPWR over LM2903DT?

A: LM2903AVQPWR offers improved input offset voltage (2mV @ 5V versus 7mV @ 5V) and higher output current capability (20mA versus 16mA). However, it uses 8-TSSOP packaging instead of 8-SOIC, requiring PCB footprint changes. Select this part only if the improved specifications justify the layout modification.

Q: Are all recommended substitutes ROHS3 compliant?

A: Yes. All direct and similar substitutes listed are ROHS3 compliant with MSL rating 1 (Unlimited), matching the compliance profile of the LM2903VQDR.

Q: What is the difference between LM2903DRG3 and LM2903DRG4?

A: Both are Texas Instruments products in 8-SOIC packaging with identical electrical specifications. LM2903DRG3 is an active product, while LM2903DRG4 is obsolete. For new designs, LM2903DRG3 is the recommended choice.

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