LM2901MX Equivalent & Substitute Parts

Part Overview

The LM2901MX is a 4-channel general-purpose comparator manufactured by onsemi in 14-SOP packaging. This device features DTL, MOS, Open-Collector, and TTL output configurations, supporting supply voltages from 2V to 36V (single) or ±1V to ±18V (dual). The LM2901MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts maintain functional compatibility while offering improved availability, extended temperature ranges, or automotive-grade qualifications.

Key Parameters

Parameter	LM2901MX
Manufacturer	onsemi
Package / Case	14-SOIC (0.154", 3.90mm Width)
Number of Elements	4
Output Type	DTL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	18mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM2901MX is determined by the following critical parameters:

Package Compatibility: 14-SOIC (0.154", 3.90mm Width) or 14-SOP equivalent
Channel Count: 4 independent comparators
Output Type: Open-Collector configuration (primary requirement for pin-level compatibility)
Supply Voltage Range: Minimum 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input Offset Voltage: Maximum 7mV @ 5V
Input Bias Current: Maximum 0.25µA @ 5V
Output Current: Minimum 16mA @ 5V
Quiescent Current: Maximum 2.5mA
Operating Temperature: Minimum -40°C ~ 85°C

Substitute parts are grouped into three categories:

Direct Substitutes (onsemi LM2901 Series): LM2901DR2G, LM2901VDR2G — Active product status with identical base functionality, improved temperature range, and enhanced availability.
Automotive-Grade Alternatives (onsemi NCV2901 & Texas Instruments LM2901Q): NCV2901DR2G, LM2901QDRG4Q1, LM2901VQDRG4Q1 — AEC-Q100 qualified with extended temperature ratings (-40°C ~ 125°C), suitable for automotive applications.
Cross-Manufacturer Equivalents (Diodes, Rohm, STMicroelectronics, Texas Instruments): AS339AMTR-E1, AS339MTR-E1, BA2901YF-MGE2, LM139AD, LM239D — Functionally equivalent with comparable electrical specifications and package compatibility.

Parameter Comparison

Parameter	LM2901MX	LM2901DR2G	LM2901VDR2G	NCV2901DR2G	LM2901QDRG4Q1	LM2901VQDRG4Q1	AS339AMTR-E1	AS339MTR-E1	BA2901YF-MGE2	LM139AD	LM239D
Manufacturer	onsemi	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	Diodes Inc.	Diodes Inc.	Rohm	Texas Instruments	STMicroelectronics
Number of Elements	4	4	4	4	4	4	4	4	4	4	4
Output Type	DTL, MOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	Open-Collector	Open-Collector	Open-Collector	Open-Collector	Open-Collector	Open-Collector, Open-Drain	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	3V ~ 36V, ±1.5V ~ 18V	3V ~ 36V, ±1.5V ~ 18V	3V ~ 36V, ±1.5V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 30V, ±1V ~ 15V	2V ~ 32V, ±1V ~ 16V
Voltage - Input Offset (Max)	7mV @ 5V	7mV @ 5V	7mV @ 5V	7mV @ 5V	7mV @ 5V	7mV @ 5V	3mV @ 5V	5mV @ 5V	7mV @ 5V	2mV @ 30V	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	0.05µA @ 5V	0.1µA @ 5V	0.25µA @ 5V
Current - Output (Typ)	18mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	20mA	20mA	16mA @ 5V	16mA @ 5V	16mA @ 5V	20mA	16mA @ 5V
Current - Quiescent (Max)	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2mA	2mA	1mA	2mA	2mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.173", 4.40mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Active	Last Time Buy	Last Time Buy	Active	Active	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Standard Industrial Applications: LM2901DR2G or LM2901VDR2G are recommended as primary substitutes. Both are active onsemi products maintaining the LM2901 base platform with identical electrical specifications to the LM2901MX. LM2901VDR2G extends the operating temperature range to -40°C ~ 125°C, providing additional thermal margin for demanding environments.

For Automotive Applications: NCV2901DR2G, LM2901QDRG4Q1, or LM2901VQDRG4Q1 are specified. All three carry AEC-Q100 automotive qualification and operate across -40°C ~ 125°C. The NCV2901DR2G maintains onsemi manufacturing continuity, while the Texas Instruments variants (LM2901QDRG4Q1, LM2901VQDRG4Q1) offer Last Time Buy status with extended availability windows.

For Cross-Manufacturer Flexibility: AS339AMTR-E1 (Diodes Incorporated) and LM239D (STMicroelectronics) provide functionally equivalent alternatives with active product status. AS339AMTR-E1 offers superior input offset voltage (3mV @ 5V) and lower quiescent current (2mA), beneficial for precision applications. LM239D supports extended output type configurations (CMOS, DTL, ECL, MOS, Open-Collector, TTL).

For Extended Temperature Range: LM139AD (Texas Instruments) operates from -55°C ~ 125°C, the widest temperature specification available. This device is suitable for extreme environment applications but carries Last Time Buy status.

Package Consideration: BA2901YF-MGE2 (Rohm Semiconductor) uses a 14-SOP package with 4.40mm width, differing from the standard 3.90mm SOIC width. This variant is suitable only for designs with flexible PCB layout or where the wider package footprint is accommodated.

Frequently Asked Questions (FAQ)

Q: Can LM2901DR2G directly replace LM2901MX without circuit modifications?

A: Yes. LM2901DR2G maintains identical electrical specifications and 14-SOIC package compatibility. The primary difference is product status (Active vs. Obsolete) and extended temperature range (-40°C ~ 105°C vs. -40°C ~ 85°C). No circuit modifications are required.

Q: What is the key difference between onsemi LM2901 variants and the NCV2901 automotive version?

A: NCV2901DR2G is AEC-Q100 qualified for automotive applications and operates to -40°C ~ 125°C. Electrical specifications remain identical to standard LM2901 parts. Selection depends on application requirements and automotive certification mandates.

Q: Are Diodes Incorporated AS339 parts pin-compatible with LM2901MX?

A: Yes. AS339AMTR-E1 and AS339MTR-E1 are pin-compatible 4-channel comparators in 14-SOIC packaging. Both support the required supply voltage range (2V ~ 36V single, ±1V ~ 18V dual) and Open-Collector output configuration. AS339AMTR-E1 offers improved input offset voltage (3mV @ 5V).

Q: Why does BA2901YF-MGE2 have a different package width (4.40mm vs. 3.90mm)?

A: BA2901YF-MGE2 uses a 14-SOP package variant with 4.40mm width, compared to the standard 14-SOIC 3.90mm width. This affects PCB footprint and is suitable only for designs with flexible layout constraints or where the wider spacing is intentional.

Q: Which substitute offers the lowest quiescent current?

A: BA2901YF-MGE2 (Rohm Semiconductor) specifies 1mA maximum quiescent current, the lowest among all listed substitutes. This is beneficial for battery-powered or low-power applications.

Q: Is LM139AD suitable as a direct replacement?

A: LM139AD is functionally equivalent but carries Last Time Buy status. It operates across -55°C ~ 125°C (widest range) and supports Open-Collector and Open-Drain outputs. Use only if extended temperature range is required; otherwise, active alternatives (LM2901DR2G, LM2901VDR2G) are preferred for long-term availability.

Q: What is the moisture sensitivity implication for AS339MTR-E1?

A: AS339MTR-E1 specifies MSL 3 (168 Hours), requiring controlled storage and handling compared to MSL 1 (Unlimited) parts. This affects supply chain logistics and storage requirements but does not impact electrical performance or functionality.

Q: Can LM239D replace LM2901MX in all applications?

A: LM239D is functionally compatible with identical supply voltage range and output current specifications. However, it operates to -40°C ~ 105°C (vs. -40°C ~ 85°C for LM2901MX) and supports extended output type configurations. Verify application temperature requirements before selection.

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