LM2903QDR Equivalent & Substitute Parts

Part Overview

The LM2903QDR is a general-purpose dual comparator IC manufactured by Texas Instruments 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 LM2903QDR is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903QDR
Manufacturer	Texas Instruments
Category	Linear Comparator
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)	20mA
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM2903QDR 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: 7mV maximum
Input bias current: 0.25µA maximum
Output current capability: minimum 16mA typical
Quiescent current: 2.5mA maximum
Operating temperature range: minimum -40°C to 125°C

Package & Mechanical Requirements:

8-SOIC (0.154", 3.90mm Width) surface-mount package
Pin-compatible footprint

Compliance Requirements:

RoHS3 compliance preferred for new designs
MSL rating of 1 (Unlimited) or equivalent

Substitute parts are grouped into three categories: manufacturer-recommended active alternatives, parametric equivalents from alternative manufacturers, and legacy parametric equivalents with active status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Supply Voltage	Input Offset (Max)	Output Current (Typ)	Operating Temp	RoHS Status	Package
LM2903QDR	Texas Instruments	Obsolete	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	-40°C ~ 125°C	RoHS non-compliant	8-SOIC
LM2903M/NOPB	Texas Instruments	Active	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	16mA @ 5V	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
LM2903MX/NOPB	Texas Instruments	Active	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	16mA @ 5V	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
LM2903QDRQ1	Texas Instruments	Active	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	20mA	-40°C ~ 125°C	ROHS3 Compliant	8-SOIC
LM393M/NOPB	Texas Instruments	Active	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	16mA @ 5V	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
LM393MX/NOPB	Texas Instruments	Active	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	16mA @ 5V	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
LM2903DR (UMW)	UMW	Active	2V ~ 30V, ±1V ~ ±15V	5mV @ 5V	16mA @ 5V	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
LM2903DRG3	Texas Instruments	Active	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	-40°C ~ 125°C	ROHS3 Compliant	8-SOIC
LM2903DRG4	Texas Instruments	Obsolete	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	-40°C ~ 125°C	ROHS3 Compliant	8-SOIC
AP393AM8G-13	Diodes Incorporated	Active	2V ~ 36V, ±1V ~ 18V	8mV @ 5V	16mA @ 5V	0°C ~ 70°C	ROHS3 Compliant	8-MSOP
AP393ASG-13	Diodes Incorporated	Active	2V ~ 36V, ±1V ~ 18V	8mV @ 5V	16mA @ 5V	0°C ~ 70°C	ROHS3 Compliant	8-SOP

Engineering Selection Recommendations

Primary Recommendation for Active Designs: LM2903M/NOPB or LM2903MX/NOPB are the preferred direct replacements. Both are active Texas Instruments products with ROHS3 compliance, identical electrical specifications to the original LM2903QDR, and 8-SOIC packaging. The primary difference is packaging format (Tube vs. Cut Tape & Digi-Reel). Operating temperature range is reduced to -40°C ~ 85°C; applications requiring -40°C ~ 125°C operation should use LM2903QDRQ1 or LM2903DRG3.

For Extended Temperature Range (-40°C ~ 125°C): LM2903QDRQ1 is an active, ROHS3-compliant automotive-grade part (AEC-Q100 qualified) with identical electrical specifications and full temperature range support. LM2903DRG3 is also active with matching specifications.

For Improved Input Offset Performance: LM393M/NOPB and LM393MX/NOPB offer superior input offset voltage (5mV vs. 7mV) and faster propagation delay (700ns typical). Operating temperature is limited to 0°C ~ 70°C. These are suitable for applications not requiring extended low-temperature operation.

For Alternative Manufacturers: LM2903DR from UMW provides parametric equivalence with active status and ROHS3 compliance. Supply voltage range is slightly reduced (2V ~ 30V vs. 2V ~ 36V). Operating temperature is 0°C ~ 70°C.

AP393AM8G-13 and AP393ASG-13 from Diodes Incorporated are active alternatives with ROHS3 compliance. Package options differ (8-MSOP and 8-SOP respectively) and require PCB layout verification for compatibility.

Obsolete Parts to Avoid: LM2903DRG4 is obsolete and should not be selected for new designs despite active inventory status.

Frequently Asked Questions (FAQ)

Q: Can LM2903M/NOPB directly replace LM2903QDR in existing designs? A: Yes, for applications operating within -40°C to 85°C. Both share identical electrical specifications, output type, supply voltage range, and 8-SOIC packaging. If your design requires operation above 85°C to 125°C, use LM2903QDRQ1 or LM2903DRG3 instead.

Q: What is the difference between LM2903M/NOPB and LM2903MX/NOPB? A: Electrical specifications are identical. The difference is packaging format: LM2903M/NOPB is supplied in Tube packaging, while LM2903MX/NOPB is supplied in Cut Tape & Digi-Reel format. Select based on your procurement and assembly requirements.

Q: Why does LM393M/NOPB have better input offset voltage than LM2903M/NOPB? A: LM393 is a different product line with tighter input offset specifications (5mV vs. 7mV). Both are dual comparators with open-collector outputs and identical supply voltage ranges. LM393 is suitable if your application benefits from improved offset performance and operates within 0°C ~ 70°C.

Q: Can I use AP393AM8G-13 or AP393ASG-13 as drop-in replacements? A: Electrically, yes. However, package differences require PCB layout verification. AP393AM8G-13 uses 8-MSOP (0.118", 3.00mm Width) and AP393ASG-13 uses 8-SOP, both differing from the original 8-SOIC (0.154", 3.90mm Width). Footprint compatibility must be confirmed before selection.

Q: Is RoHS compliance required for my application? A: The original LM2903QDR is RoHS non-compliant. All recommended active substitutes (LM2903M/NOPB, LM2903MX/NOPB, LM2903QDRQ1, LM2903DRG3, LM393M/NOPB, LM393MX/NOPB, and Diodes alternatives) are ROHS3 compliant. Select compliant parts for new designs and regulated applications.

Q: What is the difference between LM2903QDRQ1 and LM2903DRG3? A: Both are active, ROHS3-compliant Texas Instruments parts with identical electrical specifications and -40°C ~ 125°C operating range. LM2903QDRQ1 carries automotive-grade qualification (AEC-Q100). Select LM2903QDRQ1 for automotive applications; either part is suitable for industrial and commercial use.

Q: Can I use UMW LM2903DR as a substitute? A: Yes, with supply voltage consideration. UMW LM2903DR is active and ROHS3 compliant with matching electrical performance. Maximum supply voltage is 30V (vs. 36V for Texas Instruments versions). Confirm your design operates within 2V ~ 30V before selection.

Q: What does MSL rating mean for this part? A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control. All recommended substitutes carry MSL 1 or MSL 3 (168 Hours). MSL 1 parts require no special moisture handling; MSL 3 parts require controlled storage conditions.

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