LM2901M Equivalent & Substitute Parts

Part Overview

The LM2901M is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-SOIC surface-mount package. The device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with open-collector outputs suitable for logic-level interfacing.

The LM2901M is classified as obsolete, though functionally equivalent active alternatives are available from multiple manufacturers. Identifying suitable substitutes is necessary to ensure design continuity, maintain supply chain flexibility, and leverage improved specifications offered by active product lines.

Key Parameters

Parameter	Value	Condition
Number of Elements	4	—
Output Type	Open-Collector	—
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	—
Voltage - Input Offset (Max)	7mV	@ 30V
Current - Input Bias (Max)	0.25µA	@ 5V
Current - Output (Typ)	16mA	@ 5V
Current - Quiescent (Max)	2.5mA	—
Operating Temperature	-40°C ~ 85°C	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the LM2901M is determined by the following criteria:

Mandatory Matching Parameters:

Number of Elements: 4 comparators
Output Type: Open-Collector
Voltage - Supply, Single/Dual (±): 2V ~ 36V, ±1V ~ 18V (minimum range requirement)
Package / Case: 14-SOIC or mechanically compatible 14-SOP
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variations:

Voltage - Input Offset (Max): May be equal to or lower than 7mV
Current - Input Bias (Max): May be equal to or lower than 0.25µA
Current - Output (Typ): May be equal to or higher than 16mA
Current - Quiescent (Max): May be equal to or lower than 2.5mA
Operating Temperature: May extend beyond -40°C ~ 85°C
Product Status: Active products preferred over obsolete

All substitute parts listed meet these criteria and are electrically and mechanically compatible with the LM2901M in standard applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input Offset (Max)	Current - Input Bias (Max)	Current - Output (Typ)	Current - Quiescent (Max)	Operating Temperature	Package	Packaging Type
LM2901M	Texas Instruments	Obsolete	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	14-SOIC	Tube
LM2901M/NOPB	Texas Instruments	Active	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	14-SOIC	Tube
AS339AMTR-E1	Diodes Incorporated	Active	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	Tape & Reel
AS339MTR-E1	Diodes Incorporated	Active	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	Cut Tape & Digi-Reel
AS339MTR-G1	Diodes Incorporated	Active	5mV @ 5V	0.25µA @ 5V	16mA	2mA	-40°C ~ 85°C	14-SOIC	Tape & Reel
BA2901SF-E2	Rohm Semiconductor	Active	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Tape & Reel
BA2901YF-CE2	Rohm Semiconductor	Active	4mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 125°C	14-SOP	Tape & Reel
BA2901YF-LBH2	Rohm Semiconductor	Active	7mV @ 5V	0.05µA @ 5V	16mA @ 5V	2mA	-40°C ~ 125°C	14-SOP	Tape & Reel
BA2901YF-MGE2	Rohm Semiconductor	Active	7mV @ 5V	0.05µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	14-SOP	Tape & Reel
CMP04FSZ-REEL	Analog Devices Inc.	Active	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C	14-SOIC	Cut Tape & Digi-Reel
LM139ADT	STMicroelectronics	Active	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Tape & Reel

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): LM2901M/NOPB from Texas Instruments is the direct active equivalent, maintaining all electrical and thermal specifications of the obsolete LM2901M while offering improved product status and supply availability.

Preferred Alternatives (Active Status, Enhanced Specifications):

AS339AMTR-E1 and AS339MTR-E1 from Diodes Incorporated offer improved input offset voltage specifications (3mV and 5mV respectively) and reduced quiescent current (2mA vs. 2.5mA), with full supply voltage range compatibility.
BA2901YF-CE2 and BA2901YF-MGE2 from Rohm Semiconductor extend operating temperature to -40°C ~ 125°C and provide AEC-Q100 automotive qualification, suitable for extended-temperature applications.
CMP04FSZ-REEL from Analog Devices Inc. provides superior input offset voltage (1mV @ 5V) and includes specified CMRR and PSRR performance (100dB each).
LM139ADT from STMicroelectronics offers extended temperature range (-55°C ~ 125°C) and improved input offset voltage (2mV @ 30V).

Compliance Considerations: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity. Rohm Semiconductor variants with AEC-Q100 qualification are suitable for automotive applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can LM2901M/NOPB be used as a direct replacement for LM2901M? A: Yes. LM2901M/NOPB is the active equivalent from Texas Instruments with identical electrical specifications, supply voltage range, and package configuration. The primary difference is product status (active vs. obsolete) and improved supply availability.

Q: What is the key difference between 14-SOIC and 14-SOP packages? A: Both are 14-pin surface-mount packages with similar pinouts and electrical compatibility. The primary difference is package width: 14-SOIC is 0.154" (3.90mm) wide, while 14-SOP is 0.173" (4.40mm) wide. PCB layout and footprint compatibility must be verified before substitution.

Q: Are Diodes Incorporated AS339 variants fully compatible with LM2901M? A: Yes. AS339AMTR-E1, AS339MTR-E1, and AS339MTR-G1 meet all mandatory substitution criteria: four open-collector comparators, 2V ~ 36V supply range, 14-SOIC package, and surface-mount configuration. Input offset voltage and quiescent current are improved or equivalent.

Q: Which substitute offers the best performance for low-offset applications? A: CMP04FSZ-REEL from Analog Devices Inc. provides the lowest input offset voltage (1mV @ 5V) and includes specified CMRR and PSRR performance (100dB each), making it suitable for precision measurement applications.

Q: Can automotive-grade substitutes be used in non-automotive applications? A: Yes. Automotive-qualified parts (BA2901YF-CE2, BA2901YF-MGE2 with AEC-Q100) exceed standard reliability requirements and are fully compatible with general-purpose applications. Extended temperature range (-40°C ~ 125°C) provides additional margin for demanding environments.

Q: What is the impact of reduced quiescent current on system design? A: Lower quiescent current (2mA vs. 2.5mA in AS339 variants, or 1mA in BA2901YF-MGE2) reduces power consumption in battery-powered or energy-constrained applications. This is a beneficial specification improvement with no negative impact on functionality.

Q: Are there packaging format differences between substitutes? A: Yes. Substitutes are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel formats. Selection depends on production volume and assembly process requirements. Electrical specifications remain identical across packaging formats from the same manufacturer.

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