LM2901DR Equivalent & Substitute Parts

Part Overview

The LM2901DR is a 4-channel general-purpose comparator manufactured by Rohm Semiconductor in 14-SOIC surface-mount packaging. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and features CMOS, MOS, and open-collector output configurations. The LM2901DR is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain functional compatibility across electrical parameters, packaging form factor, and thermal operating ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2901DR
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

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

Electrical Compatibility Requirements:

Number of elements: 4 channels
Output type: Must support CMOS, MOS, or open-collector configurations
Supply voltage range: Minimum 2V ~ 36V single supply or ±1V ~ ±18V dual supply
Input offset voltage: Maximum 7mV @ 5V
Input bias current: Maximum 0.25µA @ 5V
Quiescent current: Maximum 2.5mA
Operating temperature: Minimum -40°C ~ 125°C

Mechanical Compatibility Requirements:

Package: 14-SOIC (0.154", 3.90mm Width) for direct PCB replacement
Mounting type: Surface mount
Pin configuration: Identical to LM2901 base product

Compliance Requirements:

RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories: Direct Pin-Compatible Substitutes (14-SOIC surface mount) and Functional Equivalents (alternative packages with identical electrical performance). Parts meeting all electrical and mechanical criteria are listed as valid substitutes.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Status
LM2901DR	Rohm Semiconductor	14-SOIC	2V~36V / ±1V~±18V	7mV @ 5V	0.25µA @ 5V	16nA @ 5V	2mA	-40°C ~ 125°C	Obsolete
LM2901D	STMicroelectronics	14-SOIC	2V~32V / ±1V~±16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2901DRG3	Texas Instruments	14-SOIC	2V~30V / ±1V~±15V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2901M/NOPB	Texas Instruments	14-SOIC	2V~36V / ±1V~±18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM2901MX/NOPB	Texas Instruments	14-SOIC	2V~36V / ±1V~±18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM139ADT	STMicroelectronics	14-SOIC	2V~32V / ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Active
LM139AJ/PB	Texas Instruments	14-CDIP	2V~36V / ±1V~±18V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	Active
LM239J	Texas Instruments	14-CDIP	2V~36V / ±1V~±18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM239QT	STMicroelectronics	16-QFN (3x3)	2V~36V / ±1V~±18V	5mV	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active

Engineering Selection Recommendations

Primary Substitutes (14-SOIC Surface Mount, Direct PCB Replacement):

LM2901D (STMicroelectronics) and LM2901DRG3 (Texas Instruments) are the preferred direct substitutes. Both maintain 14-SOIC packaging and surface-mount compatibility. LM2901D operates at reduced supply voltage limits (2V~32V single, ±1V~±16V dual) compared to the original specification. LM2901DRG3 further restricts supply voltage (2V~30V single, ±1V~±15V dual) but maintains the full -40°C to 125°C operating range. Both parts are active products with ROHS3 compliance and MSL rating 1.

LM2901M/NOPB and LM2901MX/NOPB (Texas Instruments) provide full supply voltage compatibility (2V~36V / ±1V~±18V) matching the original part. However, both restrict operating temperature to -40°C to 85°C, making them unsuitable for applications requiring the full -40°C to 125°C range. Both are active products with ROHS3 compliance.

Alternative Package Substitutes (Functional Equivalents):

LM139ADT (STMicroelectronics) in 14-SOIC packaging offers improved electrical performance with lower input offset voltage (2mV @ 30V) and input bias current (0.1µA @ 5V). Supply voltage is restricted to 2V~32V single and ±1V~±16V dual. Operating temperature extends to -55°C to 125°C. This part is active and ROHS3 compliant.

LM139AJ/PB (Texas Instruments) and LM239J (Texas Instruments) use 14-CDIP through-hole packaging, requiring PCB redesign. LM139AJ/PB maintains full supply voltage range (2V~36V / ±1V~±18V) and operating temperature (-55°C to 125°C). LM239J restricts operating temperature to -25°C to 85°C.

LM239QT (STMicroelectronics) uses 16-QFN (3x3) surface-mount packaging, requiring PCB layout modification. It maintains full supply voltage range and -40°C to 105°C operating temperature.

Compliance Status:

All substitute parts listed are ROHS3 compliant with MSL rating 1 (Unlimited). Parts with active product status are preferred for new designs. The original LM2901DR (Rohm Semiconductor) is obsolete; migration to an active substitute is required for production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM2901D directly replace LM2901DR on existing PCBs?

A: Yes. LM2901D maintains identical 14-SOIC surface-mount packaging and pin configuration. Electrical performance is compatible within the reduced supply voltage range (2V~32V single, ±1V~±16V dual). Verify your application operates within these limits before substitution.

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

A: Both are 4-channel general-purpose comparators with identical pin counts and 14-pin packaging options. LM139 variants typically offer lower input offset voltage (2mV vs. 7mV) and lower input bias current (0.1µA vs. 0.25µA). LM139 is preferred for precision applications requiring tighter input specifications. Electrical compatibility is maintained across the LM2901 and LM139 families for most general-purpose applications.

Q: Why do some substitutes have restricted operating temperature ranges?

A: Operating temperature range is determined by device qualification and manufacturing process. LM2901M/NOPB and LM2901MX/NOPB are qualified to -40°C to 85°C, while the original LM2901DR extends to 125°C. Applications requiring operation above 85°C must use LM2901D, LM2901DRG3, LM139ADT, or LM139AJ/PB.

Q: Can I use LM139AJ/PB (14-CDIP) as a substitute for LM2901DR (14-SOIC)?

A: LM139AJ/PB is electrically compatible but requires PCB redesign. 14-CDIP is through-hole packaging while 14-SOIC is surface-mount. Pin spacing and mounting holes differ. Use only if PCB layout can be modified. For direct PCB replacement without redesign, select 14-SOIC variants (LM2901D, LM2901DRG3, LM139ADT).

Q: Is LM239QT (16-QFN) compatible with LM2901DR applications?

A: LM239QT is electrically compatible but uses 16-pin QFN packaging versus 14-pin SOIC. Pin count and footprint differ significantly, requiring PCB redesign. Use only when PCB layout supports 16-QFN (3x3) surface-mount footprint. For direct replacement, select 14-SOIC variants.

Q: Which substitute offers the best performance improvement over LM2901DR?

A: LM139ADT provides superior input specifications with 2mV input offset voltage (versus 7mV) and 0.1µA input bias current (versus 0.25µA). It maintains 14-SOIC packaging for direct PCB compatibility and extends operating temperature to -55°C to 125°C. Supply voltage is restricted to 2V~32V single and ±1V~±16V dual. Verify your application operates within these limits.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed meet ROHS3 compliance requirements and carry MSL rating 1 (Unlimited). Verify compliance documentation with your supplier for specific lot codes and manufacturing dates.

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