LM2901PWR Equivalent & Substitute Parts

Part Overview

The LM2901PWR is a general-purpose comparator IC manufactured by Rohm Semiconductor, featuring four independent comparator elements in a 14-TSSOP surface-mount package. This device is classified as obsolete, though 165,505 units remain in stock as new original inventory. The LM2901PWR operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and supports multiple output types including CMOS, MOS, Open-Collector, and TTL configurations.

Due to its obsolete status, identifying functionally equivalent substitute parts is essential for ongoing design support, production continuity, and long-term component availability. Substitute parts must maintain compatibility across electrical specifications, package form factors, and operational parameters to ensure direct or near-direct replacement capability.

Key Parameters

Parameter	LM2901PWR Specification
Number of Elements	4
Output Type	CMOS, 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)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM2901PWR are evaluated based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Four independent comparator elements
Supply voltage range compatibility (minimum 2V ~ 36V single supply or ±1V ~ ±18V dual supply)
Output type compatibility (at least one matching output type: CMOS, MOS, Open-Collector, or TTL)
Input offset voltage within acceptable tolerance
Input bias current specifications
Output current capability (16mA typical)
Operating temperature range (minimum -40°C to 125°C preferred)
Package compatibility (14-TSSOP preferred for direct replacement; 14-SOIC and 14-SO acceptable for board redesign)
RoHS3 compliance and MSL rating

Substitution Groups:

Group 1: Direct Package Match (14-TSSOP) Parts maintaining identical 14-TSSOP packaging for direct PCB replacement without layout modification.

Group 2: Compatible Package Variants (14-SOIC, 14-SO) Parts with equivalent electrical specifications but different surface-mount packages requiring minimal board redesign.

Group 3: Through-Hole Alternative (14-CDIP) Parts suitable for applications where through-hole mounting is acceptable.

Parameter Comparison

Part Number	Manufacturer	Package	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Operating Temp	Product Status
LM2901PWR	Rohm Semiconductor	14-TSSOP	CMOS, MOS, Open-Collector, TTL	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	2.5mA	-40°C ~ 125°C	Obsolete
AS339GTR-E1	Diodes Incorporated	14-TSSOP	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	2mA	-40°C ~ 85°C	Active
CMP04FSZ	Analog Devices Inc.	14-SOIC	CMOS, DTL, ECL, MOS, Open-Collector, TTL	3.3V~36V, ±1.65V~18V	1mV @ 5V	0.1µA @ 5V	3mA	-40°C ~ 85°C	Active
LM139ADT	STMicroelectronics	14-SOIC	Not specified	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	2mA	-55°C ~ 125°C	Active
LM139J/PB	Texas Instruments	14-CDIP	Open-Collector, Open-Drain	2V~36V, ±1V~18V	5mV @ 30V	0.1µA @ 5V	2.5mA	-55°C ~ 125°C	Active
LM239ADT	STMicroelectronics	14-SOIC	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	2mA	-40°C ~ 105°C	Active
LM239APT	STMicroelectronics	14-TSSOP	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	2mA	-40°C ~ 105°C	Active
LM239DR2G	onsemi	14-SOIC	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM239DTBR2G	onsemi	14-TSSOP	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM239PT	STMicroelectronics	14-TSSOP	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	2mA	-40°C ~ 105°C	Active
LM2901AT14-13	Diodes Incorporated	14-TSSOP	Not specified	2V~36V, ±1V~18V	2mV @ 5V	0.25µA @ 5V	2.5mA	-40°C ~ 125°C	Active

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes):

Select parts maintaining 14-TSSOP packaging: AS339GTR-E1, LM239APT, LM239DTBR2G, LM239PT, or LM2901AT14-13. Among these, LM239APT and LM239PT from STMicroelectronics offer the broadest output type compatibility (CMOS, DTL, ECL, MOS, Open-Collector, TTL) matching the original LM2901PWR specification. Both are RoHS3 compliant with MSL 1 rating and active product status.

For Applications Requiring Extended Temperature Range:

LM139ADT and LM139J/PB support operating temperatures to -55°C, exceeding the original -40°C minimum. LM139ADT maintains 14-SOIC packaging suitable for surface-mount applications, while LM139J/PB provides through-hole 14-CDIP mounting for legacy board designs.

For High-Volume Production with Active Supply Chain:

LM239DR2G from onsemi offers 105,400 units in stock inventory, the highest availability among active substitutes. This part maintains 14-SOIC packaging, CMOS/Open-Collector/TTL output compatibility, and full supply voltage range matching (3V~36V, ±1.5V~18V). Operating temperature range (-25°C ~ 85°C) is suitable for commercial and industrial applications.

For Lowest Input Offset Voltage:

CMP04FSZ from Analog Devices provides 1mV input offset voltage at 5V, the lowest specification among all substitutes. This part is suitable for precision measurement applications requiring minimal offset error. 14-SOIC packaging requires board redesign but offers superior performance characteristics.

Compliance Considerations:

All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original LM2901PWR environmental certifications. MSL ratings vary between 1 (unlimited) and 3 (168 hours), affecting moisture handling requirements during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can AS339GTR-E1 directly replace LM2901PWR without circuit modification?

A: AS339GTR-E1 maintains identical 14-TSSOP packaging and supply voltage range (2V~36V, ±1V~18V). However, output type is limited to Open-Collector only, whereas LM2901PWR supports CMOS, MOS, Open-Collector, and TTL. Direct replacement is possible only if the circuit design uses Open-Collector output exclusively. Verify output stage requirements before substitution.

Q: What is the primary difference between LM239APT and LM239PT?

A: Both parts are STMicroelectronics LM239 variants in 14-TSSOP packaging with identical electrical specifications. LM239APT is supplied in Cut Tape (CT) & Digi-Reel packaging, while LM239PT uses the same packaging format. Selection depends on procurement and handling requirements; electrical performance is equivalent.

Q: Why does CMP04FSZ require board redesign if it is functionally equivalent?

A: CMP04FSZ uses 14-SOIC packaging (0.154" width) instead of 14-TSSOP (0.173" width). While both are surface-mount packages with 14 pins, the physical footprint differs, requiring PCB layout modification. Electrical functionality remains compatible for applications using CMOS, DTL, ECL, MOS, Open-Collector, or TTL outputs.

Q: Is LM139J/PB suitable for new surface-mount designs?

A: LM139J/PB uses 14-CDIP through-hole packaging, making it unsuitable for modern surface-mount PCB designs. This part is appropriate only for legacy board designs or applications where through-hole mounting is specified. For new surface-mount designs, select 14-TSSOP or 14-SOIC variants.

Q: How does operating temperature range affect substitution decisions?

A: LM2901PWR operates -40°C to 125°C. Substitutes with narrower ranges (e.g., LM239DR2G at -25°C to 85°C) are unsuitable for applications requiring full temperature coverage. LM139ADT and LM139J/PB extend to -55°C, providing enhanced low-temperature performance. Verify application temperature requirements before selection.

Q: What does MSL 3 (168 Hours) mean for LM2901AT14-13?

A: MSL 3 indicates the component can absorb moisture for up to 168 hours (7 days) at specified humidity before soldering. This requires stricter moisture control during storage and assembly compared to MSL 1 (unlimited) parts. For high-reliability applications or extended storage periods, MSL 1 rated parts (LM239APT, LM239PT, LM239ADT) are preferred.

Q: Can LM2901AT14-13 replace LM2901PWR despite different manufacturers?

A: LM2901AT14-13 from Diodes Incorporated maintains identical 14-TSSOP packaging, supply voltage range (2V~36V, ±1V~18V), and operating temperature (-40°C to 125°C) as the original LM2901PWR. Input offset voltage is superior (2mV vs. 7mV). Output type is not specified for LM2901AT14-13; verify output stage compatibility with circuit requirements before substitution.

Q: Which substitute offers the best inventory availability?

A: LM239DR2G from onsemi has 105,400 units in stock, the highest availability among all active substitutes. This part is suitable for high-volume production requiring reliable long-term supply. AS339GTR-E1 (25,200 units) and LM239PT (65,200 units) provide secondary options with substantial inventory levels.

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