LM2903PSRG4 Equivalent & Substitute Parts

Part Overview

The LM2903PSRG4 is a dual general-purpose comparator IC manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in an 8-SO surface mount package. This device is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for existing designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903PSRG4
Manufacturer	Texas Instruments
Type	General Purpose Comparator
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage Supply Range	2V ~ 36V (Single), ±1V ~ 18V (Dual)
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
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the LM2903PSRG4 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 or lower
Input bias current maximum: 0.25µA @ 5V
Output current capability: 16mA minimum
Quiescent current maximum: 2.5mA

Mechanical Compatibility Requirements:

8-pin SOIC surface mount package
Package width tolerance: 3.90mm to 5.30mm
Surface mount mounting type

Compliance Requirements:

ROHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories based on operating temperature range and automotive qualification status. All listed substitutes maintain electrical equivalence within the specified parameters while offering active product status and improved availability.

Parameter Comparison

Parameter	LM2903PSRG4	LM2903PSR	LM393M/NOPB	LM393MX/NOPB	BA2903YF-CE2	LM2903DT	LM2903YDT	LM393DT
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor	STMicroelectronics	STMicroelectronics	STMicroelectronics
Number of Elements	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	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail
Voltage Supply Range	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	5mV @ 30V	5mV @ 30V	4mV @ 5V	7mV @ 5V	7mV @ 5V	5mV @ 30V
Current Input Bias (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
Current Output (Typ)	20mA	20mA	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	18mA @ 5V
Current Quiescent (Max)	2.5mA	2.5mA	2.5mA	2.5mA	1mA	2.5mA	2.5mA	2.5mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 70°C
Package / Case	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.173", 4.40mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active
Inventory Availability	1017 Pcs	3300 Pcs	5381 Pcs	82700 Pcs	5100 Pcs	85400 Pcs	105300 Pcs	505100 Pcs

Engineering Selection Recommendations

Primary Substitute - Full Temperature Range: LM2903PSR (Texas Instruments) provides direct electrical and mechanical equivalence with identical package dimensions (8-SOIC 5.30mm width) and extended operating temperature range (-40°C ~ 125°C). This part maintains all electrical specifications of the LM2903PSRG4 while offering active product status and improved availability in tape and reel packaging.

Alternative Substitutes - Extended Temperature Range: LM2903DT and LM2903YDT (STMicroelectronics) maintain full electrical compatibility and extended operating temperature range (-40°C ~ 125°C). LM2903YDT includes AEC-Q100 automotive qualification. Both parts use narrower 8-SOIC packages (3.90mm width), requiring PCB layout verification for mechanical fit.

Automotive-Grade Option: LM2903YDT (STMicroelectronics) provides AEC-Q100 qualification with extended temperature range, suitable for automotive applications requiring enhanced reliability documentation.

Alternative Manufacturer Option: BA2903YF-CE2 (Rohm Semiconductor) offers equivalent electrical performance with reduced quiescent current (1mA) and improved input offset voltage (4mV @ 5V). This part includes AEC-Q100 qualification and extended temperature range (-40°C ~ 125°C). Package width (4.40mm) falls within acceptable mechanical tolerance range.

Industrial Temperature Range Options: LM393M/NOPB and LM393MX/NOPB (Texas Instruments) and LM393DT (STMicroelectronics) provide equivalent electrical performance with industrial operating temperature range (0°C ~ 70°C). These parts are suitable for non-extended temperature applications and offer highest inventory availability (82700 to 505100 units).

Frequently Asked Questions (FAQ)

Q: Can LM393 series parts directly replace LM2903PSRG4? A: LM393 series parts (LM393M/NOPB, LM393MX/NOPB, LM393DT) maintain electrical equivalence in supply voltage, output type, and comparator configuration. However, operating temperature range is limited to 0°C ~ 70°C versus the original -40°C ~ 125°C. Selection depends on application temperature requirements.

Q: What is the significance of package width differences (3.90mm vs 5.30mm)? A: Package width affects PCB footprint spacing and component density. The original LM2903PSRG4 uses 5.30mm width. Substitutes with 3.90mm or 4.40mm width packages require verification that PCB layout accommodates the narrower footprint. Pin pitch and electrical connections remain compatible across all 8-SOIC variants.

Q: Are all listed substitutes ROHS3 compliant? A: All substitute parts listed maintain ROHS3 compliance and MSL rating of 1 (Unlimited), matching the original part's environmental and moisture sensitivity specifications.

Q: Which substitute offers the best availability? A: LM393DT (STMicroelectronics) provides the highest inventory availability at 505100 units. LM2903YDT (STMicroelectronics) offers 105300 units with automotive qualification. Both maintain full electrical compatibility within their respective temperature ranges.

Q: Can BA2903YF-CE2 be used in non-automotive applications? A: BA2903YF-CE2 (Rohm Semiconductor) is qualified to AEC-Q100 automotive standards but functions as a general-purpose comparator. It is suitable for any application requiring its electrical specifications, including industrial and consumer applications.

Q: What are the key electrical differences between substitutes? A: Input offset voltage ranges from 4mV to 7mV across substitutes. Output current capability ranges from 16mA to 20mA. Quiescent current ranges from 1mA to 2.5mA. All parts maintain 0.25µA maximum input bias current and identical supply voltage ranges. Selection should prioritize specifications matching application requirements.

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