LM2901DR Equivalent & Substitute Parts

Part Overview

The LM2901DR is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is designed for open-collector output applications. The LM2901DR maintains Active product status with 205,400 units in current inventory.

Substitute parts become necessary when the primary part reaches end-of-life status, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple manufacturers is needed to ensure supply chain continuity. The parts listed below maintain functional and electrical equivalence within specified parameter tolerances.

Key Parameters

Parameter	LM2901DR	Unit
Number of Elements	4	—
Output Type	Open-Collector	—
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V	V
Voltage - Input Offset (Max)	7mV @ 30V	mV
Current - Input Bias (Max)	0.25µA @ 5V	µA
Current - Output (Typ)	20mA	mA
Current - Quiescent (Max)	2.5mA	mA
Operating Temperature	-40°C ~ 125°C	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the LM2901DR is determined by the following critical parameters:

Number of Elements: Must be 4 independent comparators
Output Type: Must support Open-Collector configuration
Supply Voltage Range: Must encompass or exceed 2V ~ 30V (single) and ±1V ~ ±15V (dual)
Input Offset Voltage: Maximum 7mV at specified test conditions
Input Bias Current: Maximum 0.25µA at 5V
Output Current: Minimum 16mA typical at 5V
Quiescent Current: Maximum 2.5mA
Operating Temperature: Must support -40°C to 125°C minimum
Package: 14-SOIC or equivalent 14-pin surface-mount package
Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications and packaging) and manufacturer-recommended alternatives (functionally equivalent with minor parameter variations within acceptable engineering tolerances).

Parameter Comparison

Part Number	Manufacturer	Supply Voltage (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Status
LM2901DR	Texas Instruments	2V~30V / ±1V~15V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC	Active
LM2901DRG3	Texas Instruments	2V~30V / ±1V~15V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC	Active
LM2901DR2G	onsemi	3V~36V / ±1.5V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	14-SOIC	Active
LM2901DT	STMicroelectronics	2V~32V / ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Active
LM139AD	Texas Instruments	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
LM139ADT	STMicroelectronics	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM239ADT	STMicroelectronics	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DT	STMicroelectronics	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
BA2901SF-E2	Rohm Semiconductor	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Active
LM2901F-E2	Rohm Semiconductor	3V~32V / ±1.5V~16V	4.5mV @ 1.4V	0.05µA @ 1.4V	16mA @ 5V	2mA	-40°C ~ 125°C	14-SOP	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes)

LM2901DRG3 (Texas Instruments, Tape & Reel packaging) is the direct parametric equivalent to LM2901DR, maintaining identical electrical specifications and 14-SOIC package format. This part is suitable for direct replacement in all applications without design modification.

Active Status Alternatives with Maintained Compatibility

LM2901DT (STMicroelectronics) and LM2901DR2G (onsemi) maintain the LM2901 base product number and support the full operating temperature range (-40°C to 125°C) required by the original specification. Both parts are Active status with high inventory availability. LM2901DT offers the closest parameter match with identical quiescent current specification.

Extended Temperature Range Options

LM139ADT and LM139DT (STMicroelectronics) extend the lower operating temperature limit to -55°C, providing enhanced performance in extreme cold environments. These parts feature improved input offset voltage (2mV to 5mV) and reduced input bias current (0.1µA to 0.25µA) compared to the LM2901DR baseline.

Alternative Package Formats

BA2901SF-E2 and LM2901F-E2 (Rohm Semiconductor) provide 14-SOP package alternatives with slightly wider package dimensions (4.40mm vs. 3.90mm width). These parts maintain functional equivalence and are suitable for applications where SOP packaging is preferred or required by manufacturing constraints.

End-of-Life Considerations

LM139AD (Texas Instruments) carries Last Time Buy status and should not be selected for new designs requiring long-term supply continuity. This part is listed for reference only in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q: Can LM2901DRG3 be used as a direct replacement for LM2901DR?

A: Yes. LM2901DRG3 is a parametric equivalent with identical electrical specifications and 14-SOIC packaging. The only difference is the packaging format (Tape & Reel vs. Cut Tape), which does not affect functional performance.

Q: What is the difference between LM2901 and LM139 series comparators?

A: The LM139 series features improved input offset voltage (2mV maximum vs. 7mV) and reduced input bias current (0.1µA maximum vs. 0.25µA). Both series maintain four independent comparators and open-collector output configuration. LM139 parts are suitable for applications requiring tighter input specifications.

Q: Are the Rohm Semiconductor BA2901SF-E2 and LM2901F-E2 compatible with the LM2901DR?

A: Both Rohm parts are functionally compatible with the LM2901DR. BA2901SF-E2 maintains identical electrical specifications with a slightly wider 14-SOP package. LM2901F-E2 offers improved input offset voltage and bias current specifications but operates within a narrower supply voltage range (3V to 32V single supply).

Q: Which substitute part has the widest supply voltage range?

A: BA2901SF-E2 (Rohm Semiconductor) supports 2V to 36V single supply and ±1V to ±18V dual supply, providing the broadest voltage compatibility range among all listed substitutes.

Q: Can I use LM239 series parts as substitutes for LM2901DR?

A: LM239ADT and LM239DT are functionally compatible with identical four-comparator configuration and open-collector output. However, these parts operate within a reduced temperature range (-40°C to 105°C maximum) compared to the LM2901DR (-40°C to 125°C), making them unsuitable for applications requiring the full extended temperature specification.

Q: What packaging options are available for LM2901 comparators?

A: The LM2901DR is available in 14-SOIC (0.154" width) surface-mount package. Equivalent parts from Rohm Semiconductor are available in 14-SOP (0.173" width) format. All packages maintain identical pin configurations and are suitable for standard PCB assembly processes.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards for industrial and commercial applications.

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