LM2901VDG Equivalent & Substitute Parts

Part Overview

The LM2901VDG is a general-purpose quad comparator IC manufactured by onsemi in 14-SOIC surface-mount packaging. This device features CMOS, open-collector, and TTL output configurations suitable for analog signal comparison applications. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across voltage supply ranges, input offset specifications, output current capabilities, and thermal operating ranges while accommodating available packaging options.

Key Parameters

Parameter	LM2901VDG Value
Number of Elements	4
Output Type	CMOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	3V ~ 36V, ±1.5V ~ 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-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the LM2901VDG is determined by the following critical parameters:

Number of Elements: Must be 4 comparators
Output Type: Must support open-collector configuration (CMOS, open-collector, or TTL compatible)
Voltage Supply Range: Must encompass or exceed 3V ~ 36V single supply and ±1.5V ~ 18V dual supply
Input Offset Voltage: Must not exceed 7mV @ 5V
Input Bias Current: Must not exceed 0.25µA @ 5V
Output Current: Must support minimum 16mA @ 5V
Quiescent Current: Must not exceed 2.5mA
Operating Temperature: Must cover -40°C ~ 125°C minimum
Package Compatibility: 14-SOIC surface-mount preferred; 14-SOP and 14-SO variants acceptable with PCB layout verification

Substitute parts are grouped by manufacturer and packaging type. All listed substitutes meet or exceed the electrical specifications of the LM2901VDG within their rated operating conditions.

Parameter Comparison

Part Number	Manufacturer	Output Type	Voltage Supply (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Status
LM2901VDG	onsemi	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Obsolete
AS339AMTR-E1	Diodes Incorporated	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	Active
AS339MTR-E1	Diodes Incorporated	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	Active
AS339MTR-G1	Diodes Incorporated	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA	2mA	-40°C ~ 85°C	14-SOIC	Active
BA2901SF-E2	Rohm Semiconductor	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Active
BA2901YF-MGE2	Rohm Semiconductor	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.05µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	14-SOP	Active
LM139ADRG4	Texas Instruments	Open-Collector, Open-Drain	2V ~ 30V, ±1V ~ 15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Discontinued
LM139ADT	STMicroelectronics	Open-Collector	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	Open-Collector	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139J/PB	Texas Instruments	Open-Collector, Open-Drain	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	14-CDIP	Active
LM239AQDRG4Q1	Texas Instruments	Open-Collector	2V ~ 36V, ±1V ~ 18V	2.5mV @ 30V	0.25µA @ 5V	20mA	2mA	-40°C ~ 125°C	14-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (14-SOIC Surface Mount, Active Status)

AS339AMTR-E1, AS339MTR-E1, and AS339MTR-G1 from Diodes Incorporated are direct 14-SOIC replacements with active product status and ROHS3 compliance. These parts feature improved input offset voltage (3mV to 5mV) compared to the LM2901VDG specification and reduced quiescent current (2mA vs. 2.5mA). Operating temperature range is -40°C ~ 85°C, which covers the lower end of the LM2901VDG range but does not extend to 125°C. These are suitable for applications not requiring extended high-temperature operation.

LM139ADT and LM139DT from STMicroelectronics provide 14-SOIC packaging with extended operating temperature to -55°C ~ 125°C, matching or exceeding the LM2901VDG thermal range. Both are ROHS3 compliant and active products. LM139ADT offers superior input offset (2mV @ 30V) and lower input bias current (0.1µA @ 5V). LM139DT provides standard specifications with 5mV input offset and 0.25µA input bias current.

LM239AQDRG4Q1 from Texas Instruments is an automotive-qualified (AEC-Q100) 14-SOIC part with -40°C ~ 125°C operating range, matching the LM2901VDG thermal specification. This part features 2.5mV input offset and 20mA output current capability, exceeding baseline requirements.

Alternative Packaging Options

BA2901SF-E2 and BA2901YF-MGE2 from Rohm Semiconductor provide 14-SOP packaging (0.173" width vs. 0.154" for SOIC). BA2901YF-MGE2 includes automotive qualification (AEC-Q100) and extends to -40°C ~ 125°C with superior input bias current (0.05µA @ 5V) and reduced quiescent current (1mA). PCB layout verification is required when substituting SOP for SOIC due to package width differences.

LM139J/PB from Texas Instruments is a through-hole 14-CDIP package option for applications requiring manual assembly or rework compatibility. This part maintains -55°C ~ 125°C operating range and 2V ~ 36V supply voltage compatibility.

Discontinued Parts

LM139ADRG4 from Texas Instruments is discontinued at DiGi Electronics and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can AS339 series parts directly replace LM2901VDG in all applications?

A: AS339 parts are electrically compatible for most applications. However, the maximum operating temperature is -40°C ~ 85°C, which does not extend to the LM2901VDG specification of 125°C. Verify application temperature requirements before selection. All AS339 variants maintain 14-SOIC packaging and open-collector output compatibility.

Q: What is the difference between AS339AMTR-E1, AS339MTR-E1, and AS339MTR-G1?

A: All three are Diodes Incorporated AS339 variants in 14-SOIC packaging with identical electrical specifications. Differences are in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) and moisture sensitivity level (MSL 1 vs. MSL 3). Selection depends on supply chain and storage requirements. Electrical performance is equivalent.

Q: Why do some substitutes show lower input offset voltage than the LM2901VDG?

A: Lower input offset voltage (e.g., 2mV vs. 7mV) indicates improved comparator precision. This is a performance enhancement and does not affect backward compatibility. Applications designed for 7mV offset tolerance will operate correctly with lower-offset parts.

Q: Can 14-SOP packages (BA2901 series) be used as direct PCB substitutes for 14-SOIC?

A: 14-SOP and 14-SOIC packages have different body widths (0.173" vs. 0.154"). Pin pitch and footprint are identical, but PCB layout must be verified to ensure clearance around the wider SOP body. Electrical functionality is identical; mechanical fit requires validation.

Q: Is LM139ADRG4 suitable for new designs?

A: No. LM139ADRG4 is discontinued at DiGi Electronics. Use active alternatives such as LM139ADT, LM139DT, or LM239AQDRG4Q1 for new designs to ensure long-term supply availability.

Q: What is the significance of AEC-Q100 qualification on BA2901YF-MGE2 and LM239AQDRG4Q1?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and testing standards. These parts are suitable for automotive applications requiring formal qualification documentation. Non-automotive applications do not require this certification but may benefit from the enhanced reliability testing.

Q: Does the LM2901VDG support both single and dual supply operation?

A: Yes. The LM2901VDG operates with single supply (3V ~ 36V) or dual supply (±1.5V ~ 18V). All listed substitutes maintain this dual-supply capability, though some have slightly different voltage ranges. Verify specific supply voltage requirements for your application.

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