LM2903PS Equivalent & Substitute Parts

Part Overview

The LM2903PS is a general-purpose comparator manufactured by Texas Instruments, featuring dual open-collector, rail-to-rail output configuration in an 8-SO surface mount package. This device operates across a wide supply voltage range of 2V to 30V (single supply) or ±1V to ±15V (dual supply), with a maximum input offset voltage of 7mV at 30V and typical output current of 6mA at 5V.

The LM2903PS currently holds Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	LM2903PS (Main Part)
Manufacturer	Texas Instruments
Package Type	8-SO (0.209", 5.30mm Width)
Product Status	Last Time Buy
Type	General Purpose Comparator
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Supply Voltage Range	2V ~ 30V (Single), ±1V ~ ±15V (Dual)
Input Offset Voltage (Max)	7mV @ 30V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	6mA @ 5V
Quiescent Current (Max)	1mA
Propagation Delay (Max)	1µs (Typ)
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903PS is determined by the following critical parameters:

Functional Equivalence Requirements:

Dual comparator configuration (2 elements)
Open-collector, rail-to-rail output topology
General-purpose comparator classification
Supply voltage range compatibility: minimum 2V ~ 30V single supply or ±1V ~ ±15V dual supply
Input bias current: 0.25µA @ 5V
Operating temperature range: -40°C to 125°C minimum

Package Compatibility Considerations:

Surface mount technology required
Package footprint variations permitted (8-SO, 8-SOIC, 8-TSSOP, 8-MSOP) with appropriate PCB layout adjustments
Pin configuration must maintain functional equivalence

Compliance Requirements:

ROHS3 compliance mandatory
MSL rating 1 (Unlimited) preferred for manufacturing flexibility

Substitute parts are grouped into two categories: MFR Recommended (primary substitutes with active product status and highest inventory availability) and Similar (alternative sources with equivalent or superior electrical specifications).

Parameter Comparison

Parameter	LM2903PS (TI)	LM2903DR (UMW)	LM193DT (ST)	LM2903D (ST)	LM2903DMR2G (onsemi)	LM2903HYDT (ST)	LM2903PT (ST)	LM2903VDR2G (onsemi)	LM2903YDT (ST)	LM293DMR2G (onsemi)	LM293PT (ST)
Manufacturer	Texas Instruments	UMW	STMicroelectronics	STMicroelectronics	onsemi	STMicroelectronics	STMicroelectronics	onsemi	STMicroelectronics	onsemi	STMicroelectronics
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Package Type	8-SO (5.30mm)	8-SOP (3.90mm)	8-SOIC (3.90mm)	8-SOIC (3.90mm)	8-MSOP (3.00mm)	8-SOIC (3.90mm)	8-TSSOP (4.40mm)	8-SOIC (3.90mm)	8-SOIC (3.90mm)	8-MSOP (3.00mm)	8-TSSOP (4.40mm)
Number of Elements	2	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, Open-Drain, Rail-to-Rail	Open-Collector, Open-Drain, Rail-to-Rail
Supply Voltage (Single)	2V ~ 30V	2V ~ 30V	2V ~ 36V	2V ~ 36V	2V ~ 36V	2V ~ 36V	2V ~ 36V	2V ~ 36V	2V ~ 36V	2V ~ 36V	2V ~ 36V
Supply Voltage (Dual)	±1V ~ ±15V	±1V ~ ±15V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V	±1V ~ ±18V
Input Offset Voltage (Max)	7mV @ 30V	5mV @ 5V	5mV @ 30V	7mV @ 5V	7mV @ 30V	7mV @ 30V	7mV @ 5V	7mV @ 30V	7mV @ 5V	5mV @ 30V	5mV @ 30V
Input Bias Current (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Output Current (Typ)	6mA @ 5V	16mA @ 5V	18mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	18mA @ 5V
Quiescent Current (Max)	1mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA
Operating Temperature	-40°C ~ 125°C	0°C ~ 70°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-25°C ~ 85°C	-40°C ~ 105°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	991 Pcs (Last Time Buy)	105200 Pcs (Active)	78081 Pcs (Active)	31475 Pcs (Active)	29200 Pcs (Active)	5200 Pcs (Active)	325100 Pcs (Active)	4761 Pcs (Active)	105300 Pcs (Active)	5100 Pcs (Active)	2669 Pcs (Active)

Engineering Selection Recommendations

Primary Substitutes (MFR Recommended):

LM2903DR (UMW) is the recommended primary substitute. This part maintains active product status with the highest inventory availability (105,200 units). It provides equivalent electrical performance with improved output current capability (16mA vs. 6mA typical). The 8-SOP package (3.90mm width) requires PCB layout modification from the original 8-SO package (5.30mm width) but maintains functional compatibility. Supply voltage range is identical to the LM2903PS (2V ~ 30V single, ±1V ~ ±15V dual). ROHS3 compliance and MSL rating 1 are maintained.

Secondary Substitutes (Similar - Active Status):

LM2903PT (STMicroelectronics) offers the highest inventory availability (325,100 units) among all substitutes. This part features extended supply voltage range (2V ~ 36V single, ±1V ~ ±18V dual) and maintains the -40°C to 125°C operating temperature range. The 8-TSSOP package (4.40mm width) differs from the original 8-SO package and requires PCB layout adjustment. Output current is 16mA typical at 5V, exceeding the original specification.

LM2903YDT (STMicroelectronics) provides automotive-grade qualification (AEC-Q100) with extended operating temperature to 150°C. This part is suitable for applications requiring automotive-level reliability. Inventory availability is 105,300 units. The 8-SOIC package (3.90mm width) requires layout modification. All electrical parameters meet or exceed the LM2903PS specifications.

LM2903D (STMicroelectronics) maintains the base LM2903 part number with active status and 31,475 units in stock. Operating temperature range matches the original (-40°C to 125°C). The 8-SOIC package (3.90mm width) requires PCB layout adjustment. Supply voltage range is extended to 2V ~ 36V single and ±1V ~ ±18V dual.

LM2903DMR2G (onsemi) provides compact 8-MSOP packaging (3.00mm width) with 29,200 units available. This part is suitable for space-constrained applications. Operating temperature range extends to 105°C. All electrical parameters are equivalent to or exceed the LM2903PS specifications.

LM193DT (STMicroelectronics) represents an alternative base part number (LM193 vs. LM2903) with equivalent functionality. This part offers extended supply voltage range (2V ~ 36V single, ±1V ~ ±18V dual) and extended operating temperature (-55°C to 125°C). Inventory availability is 78,081 units. The 8-SOIC package (3.90mm width) requires layout modification.

LM2903VDR2G (onsemi) provides 8-SOIC packaging (3.90mm width) with 4,761 units in stock. Operating temperature range is -40°C to 125°C, matching the original specification. Supply voltage range is extended to 2V ~ 36V single and ±1V ~ ±18V dual.

LM2903HYDT (STMicroelectronics) is an automotive-qualified variant (AEC-Q100) with extended operating temperature to 150°C. Inventory is limited (5,200 units). This part is recommended for automotive applications requiring enhanced temperature performance.

Alternative Substitutes (Different Base Part Number):

LM293DMR2G (onsemi) and LM293PT (STMicroelectronics) are based on the LM293 part number rather than LM2903. These parts feature open-collector and open-drain output configuration. Operating temperature ranges are more limited (-25°C to 85°C for LM293DMR2G, -40°C to 105°C for LM293PT). These substitutes are suitable only for applications where the extended output configuration and reduced temperature range are acceptable.

Package Compatibility Considerations:

The LM2903PS uses an 8-SO package (0.209", 5.30mm width). Substitute parts employ various surface mount packages:

8-SOP (3.90mm): LM2903DR
8-SOIC (3.90mm): LM193DT, LM2903D, LM2903VDR2G, LM2903YDT, LM2903HYDT
8-TSSOP (4.40mm): LM2903PT, LM293PT
8-MSOP (3.00mm): LM2903DMR2G, LM293DMR2G

PCB layout modifications are required for all substitutes due to package footprint differences. Pin configuration remains functionally equivalent across all recommended substitutes.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LM2903PS with LM2903DR without PCB modifications?

A: No. While LM2903DR is electrically equivalent, the package footprint differs (8-SOP 3.90mm vs. 8-SO 5.30mm). PCB layout modifications are required to accommodate the different pad spacing and dimensions. Verify pad-to-pad distances and trace routing before implementation.

Q2: What is the key difference between LM2903 and LM293 part numbers?

A: Both are dual general-purpose comparators with open-collector output. The primary difference is output configuration: LM2903 features open-collector, rail-to-rail output, while LM293 features open-collector and open-drain, rail-to-rail output. LM293 variants also have more limited operating temperature ranges. Use LM293 substitutes only if your application specifically requires open-drain output capability.

Q3: Why do substitute parts show higher quiescent current (2.5mA vs. 1mA)?

A: The LM2903PS specification lists 1mA maximum quiescent current, while most active substitutes specify 2.5mA maximum. This difference reflects manufacturing process variations and specification margins across different manufacturers. For power-sensitive applications, verify actual quiescent current performance through datasheet specifications or direct manufacturer consultation.

Q4: Is LM2903PT suitable for my application requiring -40°C to 125°C operation?

A: Yes. LM2903PT maintains the -40°C to 125°C operating temperature range, matching the LM2903PS specification. The 8-TSSOP package (4.40mm width) requires PCB layout modification. This part offers the highest inventory availability (325,100 units) among all substitutes.

Q5: What is the significance of AEC-Q100 qualification on LM2903HYDT and LM2903YDT?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and qualification. These parts are suitable for automotive applications requiring enhanced reliability standards. Both parts extend operating temperature to 150°C, exceeding the original LM2903PS specification (-40°C to 125°C). Use these variants only if your application requires automotive qualification or extended temperature performance.

Q6: Can I use LM193DT as a direct substitute for LM2903PS?

A: Yes, with package considerations. LM193DT is functionally equivalent with extended supply voltage range (2V ~ 36V single, ±1V ~ ±18V dual) and extended operating temperature (-55°C to 125°C). The 8-SOIC package (3.90mm width) requires PCB layout modification. Inventory availability is 78,081 units.

Q7: Which substitute offers the most compact package?

A: LM2903DMR2G and LM293DMR2G both use 8-MSOP packaging (0.118", 3.00mm width), the most compact option. LM2903DMR2G is recommended for space-constrained applications requiring the LM2903 base part number. LM293DMR2G is an alternative if open-drain output configuration is acceptable.

Q8: What inventory considerations should guide my substitute selection?

A: LM2903PT offers the highest inventory (325,100 units), followed by LM2903YDT (105,300 units) and LM2903DR (105,200 units). For long-term production requirements, prioritize parts with active product status and substantial inventory reserves. The original LM2903PS has only 991 units remaining under Last Time Buy status.

Q9: Are all recommended substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL rating 1 (Unlimited), matching the original LM2903PS environmental specifications. This ensures compatibility with modern manufacturing and environmental regulations.

Q10: How do I select between multiple substitute options?

A: Selection priority should follow this hierarchy: (1) Product status (active preferred over Last Time Buy), (2) Operating temperature range compatibility with your application, (3) Package footprint compatibility with existing PCB design, (4) Inventory availability for production volume requirements, (5) Manufacturer preference based on supply chain relationships. LM2903PT is recommended as the primary choice due to highest inventory and active status. LM2903DR is recommended if UMW manufacturer preference exists. LM2903HYDT or LM2903YDT are recommended for automotive applications.

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