LM2901N/PB Equivalent & Substitute Parts

Part Overview

The LM2901N/PB is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-DIP through-hole package. This device operates across a wide supply voltage range (2V to 32V single supply, ±1V to ±16V dual supply) and is designed for open-collector output applications. The LM2901N/PB 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 product status, enhanced compliance certifications, and alternative packaging options for modern manufacturing processes.

Key Parameters

Parameter	LM2901N/PB
Number of Elements	4
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 32V, ±1V ~ 16V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LM2901N/PB is determined by the following critical parameters:

Functional Equivalence Criteria:

Four independent comparators (Number of Elements = 4)
Open-collector or compatible output type
Supply voltage range compatibility: minimum 2V single supply or ±1V dual supply
Input offset voltage and input bias current within acceptable tolerance
Output current capability of 16mA or greater
Quiescent current not exceeding 2.5mA

Packaging and Mounting Considerations:

Through-hole 14-DIP package (primary equivalent)
Surface-mount alternatives (14-SOIC, 14-TSSOP) for PCB redesign scenarios
Tape & Reel or Cut Tape packaging for production volumes

Compliance and Product Status:

Active product status preferred for long-term availability
RoHS3 compliance for regulatory alignment
AEC-Q100 automotive qualification available for extended temperature applications

Substitute parts are grouped by package type and product status, with all candidates meeting the core electrical specifications of the original device.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current	Quiescent Current (Max)	Operating Temp	Product Status	RoHS Status
LM2901N/PB	Texas Instruments	14-DIP	Through Hole	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Obsolete	Non-compliant
LM2901N/NOPB	Texas Instruments	14-DIP	Through Hole	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active	ROHS3 Compliant
LM2901HYDT	STMicroelectronics	14-SOIC	Surface Mount	2V~36V, ±1V~18V	—	—	—	2.5mA	—	Active	ROHS3 Compliant
LM2901YDT	STMicroelectronics	14-SOIC	Surface Mount	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2901YPT	STMicroelectronics	14-TSSOP	Surface Mount	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active	ROHS3 Compliant
LM239APT	STMicroelectronics	14-TSSOP	Surface Mount	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active	ROHS3 Compliant
LM239PT	STMicroelectronics	14-TSSOP	Surface Mount	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active	ROHS3 Compliant
LM339DT	STMicroelectronics	14-SOIC	Surface Mount	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active	ROHS3 Compliant
CMP04FSZ	Analog Devices Inc.	14-SOIC	Surface Mount	3.3V~36V, ±1.65V~18V	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C	Active	ROHS3 Compliant
MAX516ACWG+T	Analog Devices Inc./Maxim Integrated	24-SOIC	Surface Mount	4.75V~16.5V	—	0.3µA @ 16.5V	—	10mA	0°C ~ 70°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Through-Hole Replacement (Pin-Compatible): LM2901N/NOPB is the primary direct replacement for LM2901N/PB. Both devices use the 14-DIP through-hole package with identical pinout. LM2901N/NOPB offers active product status, ROHS3 compliance, and extended supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) compared to the obsolete original part.

Surface-Mount Alternatives (PCB Redesign Required): For designs transitioning to surface-mount technology, three package options are available:

14-SOIC Package: LM2901YDT and LM339DT provide direct electrical equivalence with identical electrical specifications to the original device. LM2901YDT maintains the full -40°C to 125°C operating temperature range with AEC-Q100 automotive qualification. LM339DT operates within 0°C to 70°C range.
14-TSSOP Package: LM2901YPT and LM239PT offer compact surface-mount form factors. LM2901YPT maintains full temperature range (-40°C to 125°C) with AEC-Q100 qualification. LM239PT provides high inventory availability (65,200 units) with -40°C to 105°C operating range.
14-SOIC Alternative (Analog Devices): CMP04FSZ from Analog Devices provides enhanced performance specifications including lower input offset voltage (1mV) and input bias current (0.1µA), with extended supply voltage range (3.3V to 36V). CMRR and PSRR ratings of 100dB are specified.

Limited Compatibility Option: MAX516ACWG+T is a 24-SOIC package device with restricted supply voltage range (4.75V to 16.5V) and higher quiescent current (10mA). This part is suitable only for applications operating within its narrower voltage specification and is not recommended as a general substitute.

Product Status and Compliance: All recommended substitutes carry active product status and ROHS3 compliance. Automotive-grade variants (LM2901YDT, LM2901YPT) include AEC-Q100 qualification for extended temperature applications.

Frequently Asked Questions (FAQ)

Q: Can LM2901N/NOPB directly replace LM2901N/PB without PCB modification? A: Yes. Both parts use identical 14-DIP through-hole packaging and pinout. LM2901N/NOPB is the direct replacement with improved product status and compliance.

Q: What is the key difference between LM2901 and LM339 series comparators? A: Both are four-channel general-purpose comparators with compatible electrical specifications. The primary distinction is product lineage and manufacturer. LM2901 variants are available from Texas Instruments and STMicroelectronics, while LM339 variants are primarily from STMicroelectronics. Electrical performance is equivalent within specified parameters.

Q: Can I use a surface-mount part (14-SOIC or 14-TSSOP) as a drop-in replacement for the 14-DIP package? A: No. Surface-mount packages require PCB redesign and different soldering processes. However, electrical functionality is equivalent, making them suitable for new designs or board revisions.

Q: Which substitute part offers the best performance specifications? A: CMP04FSZ from Analog Devices provides the lowest input offset voltage (1mV) and input bias current (0.1µA), along with specified CMRR and PSRR values (100dB each). However, it requires supply voltage minimum of 3.3V, which may not be compatible with all applications.

Q: Are automotive-qualified versions available? A: Yes. LM2901YDT and LM2901YPT carry AEC-Q100 automotive qualification with extended operating temperature ranges (-40°C to 125°C for LM2901YPT). These parts are suitable for automotive and industrial applications requiring temperature stability.

Q: What is the inventory status of these substitute parts? A: All recommended substitutes are in active production with substantial inventory. LM339DT has the highest availability (445,200 units), followed by LM239PT (65,300 units) and LM2901YPT (55,300 units).

Q: Is MAX516ACWG+T a suitable general substitute? A: MAX516ACWG+T has limited compatibility due to its restricted supply voltage range (4.75V to 16.5V minimum) and higher quiescent current (10mA). It is not recommended as a general substitute unless your application operates exclusively within this voltage window.

Q: What packaging should I select for new designs? A: For new designs, surface-mount packages (14-SOIC or 14-TSSOP) are preferred for manufacturing efficiency. LM2901YPT (14-TSSOP) or LM339DT (14-SOIC) provide active status, ROHS3 compliance, and high availability. For automotive applications, select AEC-Q100 qualified variants.

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