LM2903M Equivalent & Substitute Parts

Part Overview

The LM2903M is a dual general-purpose comparator 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 LM2903M is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and production support beyond the manufacturer's active lifecycle.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	LM2903M	—
Manufacturer	Texas Instruments	—
Number of Elements	2	—
Output Type	Open-Collector, Rail-to-Rail	—
Voltage Supply (Single/Dual)	2V ~ 36V / ±1V ~ 18V	V
Voltage Input Offset (Max)	7mV @ 30V	mV
Current Input Bias (Max)	0.25µA @ 5V	µA
Current Output (Typ)	16mA @ 5V	mA
Current Quiescent (Max)	2.5mA	mA
Operating Temperature	-40°C ~ 85°C	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM2903M is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

Number of comparator elements: 2
Output configuration: Open-Collector, Rail-to-Rail
Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage: ≤ 7mV @ 30V
Input bias current: ≤ 0.25µA @ 5V
Output current capability: ≥ 16mA @ 5V
Quiescent current: ≤ 2.5mA
Operating temperature range: Minimum -40°C, Maximum ≥ 85°C
Package compatibility: 8-SOIC, 8-MSOP, or 8-TSSOP surface-mount packages
RoHS3 compliance and MSL 1 rating

Substitute parts are grouped into three categories based on package type and electrical performance alignment:

Group 1: Direct 8-SOIC Package Equivalents — Identical package footprint with matching electrical specifications.

Group 2: Alternative Package Formats (8-MSOP, 8-TSSOP) — Functionally equivalent but different surface-mount package geometries requiring PCB layout modification.

Group 3: Enhanced Performance Variants — Parts with superior electrical characteristics (lower input offset, lower input bias current) within compatible packages.

Parameter Comparison

Part Number	Manufacturer	Package	Product Status	Voltage Supply	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Inventory
LM2903M	Texas Instruments	8-SOIC	Last Time Buy	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	27,883 Pcs
LM2903M/NOPB	Texas Instruments	8-SOIC	Active	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	120,721 Pcs
LM2903DT	STMicroelectronics	8-SOIC	Active	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	85,400 Pcs
LM2903DMR2G	onsemi	8-MSOP	Active	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	29,200 Pcs
LM293DMR2G	onsemi	8-MSOP	Active	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	5,100 Pcs
LM293PT	STMicroelectronics	8-TSSOP	Active	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 105°C	2,669 Pcs
LM293QT	STMicroelectronics	8-UFSON (2x2)	Active	2V~36V / ±1V~18V	—	—	—	2.5mA	—	2,100 Pcs
LM393ADT	STMicroelectronics	8-SOIC	Active	2V~36V / ±1V~18V	2mV @ 30V	0.1µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	172,265 Pcs
LM393DR2G	onsemi	8-SOIC	Active	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	205,400 Pcs
LM393PT	STMicroelectronics	8-TSSOP	Active	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	15,419 Pcs
LM393QT	STMicroelectronics	8-UFSON (2x2)	Active	2V~36V / ±1V~18V	—	—	—	2.5mA	—	2,000 Pcs

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification Required):

LM2903M/NOPB is the primary direct equivalent. This part is manufactured by Texas Instruments with identical electrical specifications and 8-SOIC packaging. Product status is Active, ensuring long-term availability. This is the recommended first choice for LM2903M substitution.

LM2903DT (STMicroelectronics, 8-SOIC) provides equivalent electrical performance with extended operating temperature range (-40°C to 125°C versus -40°C to 85°C). This part is suitable for applications requiring enhanced thermal performance.

LM393ADT (STMicroelectronics, 8-SOIC) offers superior electrical characteristics with lower input offset voltage (2mV versus 7mV) and lower input bias current (0.1µA versus 0.25µA). Operating temperature range is 0°C to 70°C, which is narrower than the LM2903M. This part is appropriate for precision applications where lower offset voltage is beneficial and the narrower temperature range is acceptable.

LM393DR2G (onsemi, 8-SOIC) provides equivalent electrical performance with operating temperature range 0°C to 70°C. High inventory availability (205,400 Pcs) supports supply chain continuity.

For Alternative Package Formats (PCB Layout Modification Required):

LM2903DMR2G (onsemi, 8-MSOP) maintains identical electrical specifications in a smaller 8-MSOP package (3.00mm width versus 3.90mm for 8-SOIC). Extended operating temperature range (-40°C to 105°C) is provided.

LM293PT (STMicroelectronics, 8-TSSOP) offers enhanced output current capability (18mA versus 16mA) and lower input offset voltage (5mV versus 7mV) in 8-TSSOP packaging. Operating temperature range is -40°C to 105°C.

LM393PT (STMicroelectronics, 8-TSSOP) provides enhanced output current (18mA) and lower input offset voltage (5mV) in 8-TSSOP format. Operating temperature range is 0°C to 70°C.

For Compact Form Factor Applications:

LM293QT and LM393QT (both STMicroelectronics, 8-UFSON 2x2) provide the smallest package footprint. Detailed electrical parameters are not fully specified in available data. These parts are suitable only when package size is the primary constraint and complete electrical characterization is obtained from the manufacturer.

All substitute parts maintain RoHS3 compliance and MSL 1 rating, consistent with the original LM2903M specification.

Frequently Asked Questions (FAQ)

Q1: Can LM2903M/NOPB be used as a direct replacement for LM2903M?

A: Yes. LM2903M/NOPB is manufactured by Texas Instruments with identical electrical specifications, 8-SOIC packaging, and operating temperature range (-40°C to 85°C). The "/NOPB" suffix indicates lead-free, RoHS-compliant manufacturing. This is the recommended direct substitute.

Q2: What is the difference between LM2903 and LM393 series comparators?

A: Both are dual general-purpose comparators with open-collector, rail-to-rail output. The LM393 series typically features lower input offset voltage (2mV to 5mV) and lower input bias current (0.1µA to 0.25µA) compared to LM2903 (7mV offset, 0.25µA bias). The LM393 operating temperature range is typically 0°C to 70°C, narrower than LM2903 (-40°C to 85°C). Selection depends on application precision requirements and temperature operating range.

Q3: Can I use an 8-MSOP package part as a substitute for 8-SOIC?

A: Electrical substitution is possible, but PCB layout modification is required. The 8-MSOP package (3.00mm width) has different pin spacing and footprint than 8-SOIC (3.90mm width). Verify PCB design compatibility and reflow profile requirements before implementation.

Q4: What does "Last Time Buy" status mean for LM2903M?

A: Last Time Buy indicates the manufacturer (Texas Instruments) has discontinued production and will not accept new orders beyond a specified date. Existing inventory is available, but long-term supply is not guaranteed. Identifying and qualifying substitute parts is essential for design continuity beyond the Last Time Buy deadline.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original LM2903M specification.

Q6: Which substitute offers the best inventory availability?

A: LM393DR2G (onsemi, 8-SOIC) has the highest inventory level at 205,400 Pcs. LM2903M/NOPB (Texas Instruments) has 120,721 Pcs available. Both support immediate procurement and supply chain continuity.

Q7: Can I substitute LM293 series for LM2903?

A: LM293 series parts (LM293DMR2G, LM293PT, LM293QT) are functionally compatible with lower input offset voltage (5mV) and support the same supply voltage range and output configuration. However, LM293 operating temperature range may be narrower (-25°C to 85°C for LM293DMR2G). Verify application temperature requirements before substitution.

Q8: What is the significance of input offset voltage differences?

A: Input offset voltage determines the accuracy of voltage comparison at the threshold point. Lower offset voltage (2mV for LM393ADT versus 7mV for LM2903M) provides more precise threshold detection. Applications requiring high-precision comparisons benefit from lower offset voltage parts. Standard applications are not affected by this difference.

Q9: Do all substitute parts support ±1V to ±18V dual supply operation?

A: Yes. All substitute parts listed support dual supply operation (±1V to ±18V) in addition to single supply (2V to 36V), matching the original LM2903M specification.

Q10: What is the difference between 8-SOIC, 8-MSOP, and 8-TSSOP packages?

A: All three are 8-pin surface-mount packages with different physical dimensions. 8-SOIC (0.154" width, 3.90mm) is the standard package. 8-MSOP (0.118" width, 3.00mm) is more compact. 8-TSSOP (0.173" width, 4.40mm) is intermediate. Package selection depends on PCB space constraints and manufacturing equipment compatibility. Electrical performance is equivalent across all three package types for the same part number base.

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