LM2901D Equivalent & Substitute Parts

Part Overview

The LM2901D is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is designed for open-collector output applications. The LM2901D is currently in Last Time Buy status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2901D
Manufacturer	Texas Instruments
Number of Elements	4 Comparators
Output Type	Open-Collector
Supply Voltage Range	2V ~ 30V (Single), ±1V ~ 15V (Dual)
Input Offset Voltage (Max)	7mV @ 30V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	20mA
Quiescent Current (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the LM2901D is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Number of Elements: 4 comparators
Package Type: 14-SOIC (0.154", 3.90mm Width) or equivalent 14-pin surface-mount package
Output Type: Open-Collector or compatible output configuration
Supply Voltage Range: Must encompass or exceed 2V ~ 30V (single supply) and ±1V ~ ±15V (dual supply)
Operating Temperature: Must support -40°C ~ 125°C minimum
Mounting Type: Surface Mount

Allowable Parameter Variations:

Input Offset Voltage: Up to 7mV maximum
Input Bias Current: Up to 0.25µA maximum
Output Current: Minimum 16mA typical
Quiescent Current: Up to 2.5mA maximum

Substitute parts are grouped into three categories: Direct Manufacturer Alternatives (same base part number from different manufacturers), MFR Recommended Substitutes (functionally equivalent from established manufacturers), and Upgrade Options (enhanced specifications with automotive qualification).

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Status
LM2901D	Texas Instruments	2V~30V, ±1V~15V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC	Last Time Buy
LM2901M	onsemi	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 85°C	14-SOIC	Obsolete
LM2901DR	Rohm Semiconductor	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16nA @ 5V	2mA	-40°C ~ 125°C	14-SOIC	Obsolete
LM139AD	Texas Instruments	2V~30V, ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
LM2901M/NOPB	Texas Instruments	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	14-SOIC	Active
LM2901MX/NOPB	Texas Instruments	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	14-SOIC	Active
LM2901AQS14-13	Diodes Incorporated	2V~36V, ±1V~18V	2mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Active
BA2901SF-E2	Rohm Semiconductor	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC (0.173", 4.40mm)	Active
LM139ADT	STMicroelectronics	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM239ADT	STMicroelectronics	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility): LM2901M/NOPB and LM2901MX/NOPB from Texas Instruments are the primary alternatives. Both maintain the same base part number (LM2901) and are currently in Active status. These parts feature expanded supply voltage ranges (2V~36V single, ±1V~18V dual) that fully encompass the original LM2901D specifications. Both are ROHS3 compliant and carry identical MSL ratings. The primary trade-off is reduced operating temperature range (-40°C ~ 85°C versus -40°C ~ 125°C) and slightly lower typical output current (16mA versus 20mA).

Tier 2 - Functionally Equivalent Alternatives: LM139AD and LM139ADT from Texas Instruments and STMicroelectronics respectively offer superior input offset voltage specifications (2mV maximum versus 7mV) and lower input bias current (0.1µA versus 0.25µA). LM139ADT extends the operating temperature range to -55°C ~ 125°C. These parts are suitable for applications requiring tighter input specifications. LM239ADT from STMicroelectronics provides comparable performance with CMOS/DTL/ECL/MOS/Open-Collector/TTL output compatibility.

Tier 3 - Extended Supply Range Options: LM2901AQS14-13 from Diodes Incorporated is qualified to AEC-Q100 automotive standards and maintains full -40°C ~ 125°C operating range with improved input offset voltage (2mV). This part is recommended for automotive or high-reliability applications. BA2901SF-E2 from Rohm Semiconductor offers active status with extended supply voltage range but features a slightly wider package body (0.173" versus 0.154").

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status. MSL ratings are consistent at Level 1 (Unlimited) across all alternatives. ECCN and HTSUS classifications remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can LM2901M/NOPB directly replace LM2901D in existing designs? A: Yes, with one design consideration. The LM2901M/NOPB supports a higher maximum supply voltage (36V versus 30V) and dual supply range (±18V versus ±15V), making it a superset-compatible replacement. The reduced operating temperature range (-40°C ~ 85°C) must be verified against application requirements. Output current is slightly lower (16mA typical versus 20mA), which may impact pull-up resistor calculations in open-collector circuits.

Q: What is the difference between LM2901 and LM139 series comparators? A: Both are four-element general-purpose comparators in 14-SOIC packages with open-collector outputs. The LM139 series features superior input specifications: input offset voltage of 2mV (versus 7mV for LM2901) and input bias current of 0.1µA (versus 0.25µA). The LM139 series also supports extended temperature ranges (-55°C minimum). Selection depends on whether the application requires tighter input accuracy or extended temperature operation.

Q: Are there package compatibility issues between 14-SOIC variants? A: Most substitutes use standard 14-SOIC packages (0.154", 3.90mm width). BA2901SF-E2 uses a slightly wider 14-SOP package (0.173", 4.40mm width). While both are surface-mount 14-pin packages, PCB layout verification is recommended to confirm pad spacing compatibility before design implementation.

Q: Which substitute offers the best long-term availability? A: LM2901MX/NOPB and LM2901M/NOPB from Texas Instruments are in Active status with substantial inventory (26,730 and 3,100 units respectively). LM2901AQS14-13 from Diodes Incorporated (20,100 units) and LM139ADT from STMicroelectronics (4,825 units) also provide active production status. Parts marked Obsolete (LM2901M from onsemi, LM2901DR from Rohm) should be avoided for new designs despite current inventory availability.

Q: What are the implications of the Last Time Buy status for LM2901D? A: Last Time Buy status indicates the manufacturer will cease production after a specified date. Existing inventory of 36,100 units is available, but no future production is planned. Designs currently using LM2901D should transition to Active-status alternatives such as LM2901MX/NOPB or LM2901AQS14-13 to ensure long-term supply chain continuity.

Q: Can LM2901 parts be used in automotive applications? A: Standard LM2901 variants are not automotive-qualified. LM2901AQS14-13 from Diodes Incorporated carries AEC-Q100 qualification and is specifically designed for automotive use. This part should be selected for automotive applications requiring comparator functionality.

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