LM2901MX Equivalent & Substitute Parts

Part Overview

The LM2901MX is a 4-channel general-purpose comparator manufactured by Rohm Semiconductor in a 14-SOIC surface-mount package. This device features CMOS, MOS, and open-collector TTL output configurations, supporting a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM2901MX is classified as "Not For New Designs," indicating obsolescence in the product lifecycle. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this comparator.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2901MX
Manufacturer	Rohm Semiconductor
Category	Linear Comparator
Number of Elements	4
Output Type	CMOS, MOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	2V ~ 36V / ±1V ~ 18V
Input Offset Voltage (Max)	7mV @ 5V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	16nA @ 5V
Quiescent Current (Max)	2mA
Operating Temperature	-40°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2901MX is determined by the following critical parameters:

Number of Elements: Must be 4 channels
Package Type: 14-SOIC (0.154", 3.90mm Width) or compatible surface-mount packages
Output Configuration: Must support Open-Collector or TTL output types
Supply Voltage Range: Minimum overlap of 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input Offset Voltage: Maximum 7mV @ 5V or better
Input Bias Current: Maximum 0.25µA @ 5V or better
Operating Temperature: Must cover -40°C ~ 125°C or a subset thereof
Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped into two categories:

Category A - Direct Package Equivalents (14-SOIC): Parts maintaining identical 14-SOIC packaging with full parameter compatibility across supply voltage, temperature range, and output types.

Category B - Alternative Packages (14-TSSOP): Parts with equivalent electrical specifications but different surface-mount package geometry, suitable for designs with package flexibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Output Type	Supply Voltage (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Temp Range
LM2901MX	Rohm Semiconductor	Not For New Designs	14-SOIC	CMOS, MOS, Open-Collector, TTL	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16nA @ 5V	2mA	-40°C ~ 125°C
CMP04FSZ	Analog Devices Inc.	Active	14-SOIC	CMOS, DTL, ECL, MOS, Open-Collector, TTL	3.3V~36V / ±1.65V~18V	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C
CMP04FSZ-REEL	Analog Devices Inc.	Active	14-SOIC	CMOS, DTL, ECL, MOS, Open-Collector, TTL	3.3V~36V / ±1.65V~18V	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C
LM239DR2G	onsemi	Active	14-SOIC	CMOS, Open-Collector, TTL	3V~36V / ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C
LM239DTBR2G	onsemi	Active	14-TSSOP	CMOS, Open-Collector, TTL	3V~36V / ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C
LM2901D	STMicroelectronics	Active	14-SOIC	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V / ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C
LM2901DR	Rohm Semiconductor	Obsolete	14-SOIC	CMOS, MOS, Open-Collector, TTL	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16nA @ 5V	2mA	-40°C ~ 125°C
LM2901DRG3	Texas Instruments	Active	14-SOIC	Open-Collector	2V~30V / ±1V~15V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C
LM2901M	onsemi	Obsolete	14-SOIC	DTL, MOS, Open-Collector, TTL	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 85°C
LM2901M/NOPB	Texas Instruments	Active	14-SOIC	Open-Collector	2V~36V / ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility)

LM2901D (STMicroelectronics) is the preferred substitute. It maintains identical electrical specifications to the LM2901MX, including 7mV input offset voltage, 0.25µA input bias current, and -40°C to 125°C operating temperature range. The device is ROHS3 compliant and actively manufactured. The supply voltage range is slightly reduced (2V~32V single, ±1V~16V dual) compared to the original 2V~36V / ±1V~18V, but covers standard industrial applications.

LM2901M/NOPB (Texas Instruments) provides an active alternative with identical supply voltage range (2V~36V / ±1V~18V) and temperature coverage (-40°C ~ 85°C). This part is ROHS3 compliant and suitable for applications not requiring the full -40°C to 125°C range.

Secondary Substitutes (Active Status, Parameter Variations)

LM239DR2G (onsemi) is an active 4-channel comparator in 14-SOIC packaging with compatible output types. The input offset voltage is 5mV (improved from 7mV), and the operating temperature range is -25°C to 85°C. This part is suitable for applications with relaxed low-temperature requirements.

CMP04FSZ and CMP04FSZ-REEL (Analog Devices Inc.) offer superior input offset voltage (1mV) and input bias current (0.1µA), with expanded output type support including DTL and ECL. Operating temperature is -40°C to 85°C. These parts are actively manufactured and ROHS3 compliant.

Alternative Package Option

LM239DTBR2G (onsemi) provides equivalent electrical performance to LM239DR2G but in a 14-TSSOP package. This option is suitable for designs with package flexibility or space constraints requiring a smaller footprint.

Obsolete Parts (Not Recommended for New Designs)

LM2901DR (Rohm Semiconductor) and LM2901M (onsemi) are classified as obsolete. While electrically compatible, these parts should not be selected for new designs due to discontinued manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM2901MX with LM2901D?

A: Yes. LM2901D is a direct electrical and package equivalent. Both are 4-channel comparators in 14-SOIC packaging with identical input offset voltage (7mV @ 5V), input bias current (0.25µA @ 5V), and operating temperature range (-40°C ~ 125°C). LM2901D is actively manufactured by STMicroelectronics and ROHS3 compliant.

Q: What is the difference between CMP04FSZ and CMP04FSZ-REEL?

A: Both parts are electrically identical. The difference is packaging format: CMP04FSZ is supplied in Tube packaging, while CMP04FSZ-REEL is supplied in Cut Tape (CT) & Digi-Reel format. Select based on your procurement and assembly requirements.

Q: Why does LM239DR2G have a narrower temperature range (-25°C ~ 85°C) compared to LM2901MX (-40°C ~ 125°C)?

A: LM239DR2G is a different product variant optimized for a different temperature specification. If your application requires -40°C operation, this part is not suitable. Use LM2901D or LM2901M/NOPB instead.

Q: Is LM239DTBR2G compatible with my PCB designed for 14-SOIC packages?

A: No. LM239DTBR2G uses a 14-TSSOP package (0.173", 4.40mm width) instead of 14-SOIC (0.154", 3.90mm width). The pinout is compatible, but the physical footprint differs. This part requires PCB redesign or use of an adapter.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended active substitutes (LM2901D, LM2901M/NOPB, LM239DR2G, LM239DTBR2G, CMP04FSZ, CMP04FSZ-REEL) are ROHS3 compliant with MSL 1 (Unlimited moisture sensitivity level).

Q: What is the key difference between LM2901MX and CMP04FSZ in terms of output types?

A: LM2901MX supports CMOS, MOS, Open-Collector, and TTL outputs. CMP04FSZ supports CMOS, DTL, ECL, MOS, Open-Collector, and TTL outputs. CMP04FSZ provides additional DTL and ECL output compatibility. However, CMP04FSZ has a reduced operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C).

Q: Can I use LM2901M as a substitute even though it is marked as obsolete?

A: LM2901M is electrically compatible but is classified as obsolete. It should not be selected for new designs. Use active alternatives such as LM2901D or LM2901M/NOPB to ensure long-term supply chain availability and manufacturing support.

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