LM2903DR2 Equivalent & Substitute Parts

Part Overview

The LM2903DR2 is a dual comparator integrated circuit manufactured by onsemi in 8-SOIC surface-mount packaging. This device functions as a general-purpose comparator with open-collector, rail-to-rail output configuration. The main part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain functional equivalence while offering active product status and improved availability.

Key Parameters

Parameter	LM2903DR2
Manufacturer	onsemi
Base Product Number	LM2903
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the LM2903DR2 is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the LM2903 base product number or equivalent comparator architecture with dual elements, general-purpose configuration, and open-collector rail-to-rail output.

Electrical Compatibility: Substitute parts operate within the same supply voltage range (2V ~ 36V single or ±1V ~ 18V dual), input offset voltage (5mV to 7mV @ 5V or 30V), input bias current (0.1µA to 0.25µA @ 5V), and quiescent current (2.5mA maximum).

Package Compatibility: Direct substitutes maintain 8-SOIC surface-mount packaging with identical pin configuration and mechanical dimensions (0.154", 3.90mm width). The LM193H/NOPB represents a functional alternative in TO-99-8 through-hole packaging for applications permitting different mounting technology.

Compliance Status: Active substitute parts are RoHS3 compliant with REACH unaffected status, addressing regulatory requirements absent in the obsolete main part.

Packaging Format: Substitute parts are available in Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Tube formats, providing supply chain flexibility.

Parameter Comparison

Parameter	LM2903DR2 (onsemi)	LM2903DR2G (onsemi)	LM2903WDT (STMicroelectronics)	LM2903WYDT (STMicroelectronics)	LM193H/NOPB (Texas Instruments)	LM2903D (STMicroelectronics)	LM2903DT (STMicroelectronics)	LM2903HYDT (STMicroelectronics)	LM2903Q2T (STMicroelectronics)	LM2903QDRQ1 (Texas Instruments)
Number of Elements	2	2	2	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, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail
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	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	—	7mV @ 30V	7mV @ 30V	7mV @ 30V	5mV @ 30V	7mV @ 5V	7mV @ 5V	7mV @ 30V	7mV @ 5V	7mV @ 5V
Current - Input Bias (Max)	—	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Current - Output (Typ)	—	16mA @ 5V	20mA	20mA	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	20mA
Current - Quiescent (Max)	—	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA
Operating Temperature	—	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	TO-99-8 Metal Can	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-UFDFN Exposed Pad	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
Grade	—	—	—	Automotive	—	—	—	Automotive	—	Automotive
Qualification	—	—	—	AEC-Q100	—	—	—	AEC-Q100	—	AEC-Q100

Engineering Selection Recommendations

Direct Surface-Mount Substitutes (8-SOIC Package): The LM2903DR2G (onsemi), LM2903WDT (STMicroelectronics), LM2903WYDT (STMicroelectronics), LM2903D (STMicroelectronics), LM2903DT (STMicroelectronics), and LM2903QDRQ1 (Texas Instruments) provide pin-compatible replacements in identical 8-SOIC packaging. All are RoHS3 compliant with active product status and equivalent electrical performance within specified operating ranges.

Automotive-Grade Options: The LM2903WYDT and LM2903HYDT (both STMicroelectronics) and LM2903QDRQ1 (Texas Instruments) carry automotive qualification (AEC-Q100) and are suitable for applications requiring automotive-grade components. The LM2903HYDT extends operating temperature to -40°C ~ 150°C.

Extended Temperature Range: The LM2903HYDT supports -40°C ~ 150°C operation, exceeding standard -40°C ~ 125°C specifications of most alternatives.

Compact Package Alternative: The LM2903Q2T (STMicroelectronics) provides equivalent functionality in 8-DFN (2x2) surface-mount packaging for space-constrained applications.

Through-Hole Alternative: The LM193H/NOPB (Texas Instruments) offers functional equivalence in TO-99-8 through-hole packaging for designs utilizing through-hole assembly technology. This part features lower input bias current (0.1µA) and extended operating temperature (-55°C ~ 125°C).

Regulatory Compliance: All active substitute parts are RoHS3 compliant, addressing environmental regulations absent in the obsolete main part. REACH status remains unaffected across all options.

Frequently Asked Questions (FAQ)

Q: Can LM2903DR2 be directly replaced with LM2903DR2G? A: Yes. Both parts share identical 8-SOIC packaging, pin configuration, and electrical specifications. LM2903DR2G is the active equivalent with RoHS3 compliance and improved availability.

Q: What is the difference between LM2903WDT and LM2903WYDT? A: Both are STMicroelectronics LM2903 comparators in 8-SOIC packaging with identical electrical performance. LM2903WYDT includes automotive qualification (AEC-Q100) and is supplied in Cut Tape & Digi-Reel® format, while LM2903WDT is supplied in Tape & Reel format. Select based on packaging requirements and automotive application needs.

Q: Is LM193H/NOPB a suitable replacement for LM2903DR2? A: LM193H/NOPB provides functional equivalence with identical electrical specifications and superior input bias current performance (0.1µA vs. 0.25µA). However, it uses TO-99-8 through-hole packaging instead of 8-SOIC surface-mount, requiring different PCB layout and assembly process. Use only if through-hole mounting is acceptable.

Q: Which substitute part should I select for automotive applications? A: LM2903WYDT, LM2903HYDT, or LM2903QDRQ1 are qualified for automotive use with AEC-Q100 certification. LM2903HYDT offers the widest operating temperature range (-40°C ~ 150°C).

Q: What is the difference between 8-SOIC and 8-DFN packaging? A: 8-SOIC (LM2903DR2, LM2903WDT, LM2903WYDT, LM2903D, LM2903DT, LM2903HYDT, LM2903QDRQ1) is a standard surface-mount package with gull-wing leads. 8-DFN (LM2903Q2T) is a smaller, leadless package with exposed pad, suitable for space-constrained designs. Both are surface-mount; pin configuration differs.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All active substitute parts listed are RoHS3 compliant. The original LM2903DR2 is RoHS non-compliant, making substitution necessary for RoHS-regulated applications.

Q: What inventory levels are available for each substitute? A: LM2903Q2T has the highest inventory (174,900 pcs), followed by LM2903DR2G (136,144 pcs) and LM2903DT (85,400 pcs). LM2903HYDT has the lowest inventory (5,200 pcs). Verify current availability with your supplier.

Q: Can I use LM2903Q2T as a drop-in replacement? A: LM2903Q2T provides electrical equivalence but requires PCB redesign due to 8-DFN packaging differences from the 8-SOIC main part. Pin assignment differs; consult datasheets for pinout verification.

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