LM2901VQDR Equivalent & Substitute Parts

Part Overview

The LM2901VQDR is a 4-channel general-purpose comparator manufactured by Rohm Semiconductor in a 14-SOIC surface-mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The LM2901VQDR operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is suitable for applications requiring multiple independent comparator functions with open-collector, TTL, CMOS, and MOS output compatibility.

Key Parameters

Parameter	Value	Condition
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)	16nA	@ 5V
Current - Quiescent (Max)	2mA	—
Operating Temperature	-40°C ~ 125°C	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM2901VQDR is determined by the following critical parameters:

Number of Elements: Must be 4 independent comparators
Package Type: 14-SOIC form factor with 0.154" (3.90mm) width for direct PCB compatibility
Output Type Compatibility: Must support at least one of the following: CMOS, MOS, Open-Collector, or TTL
Supply Voltage Range: Must encompass or exceed 2V ~ 36V single supply and ±1V ~ ±18V dual supply
Input Offset Voltage: Maximum 7mV at 5V or equivalent test condition
Input Bias Current: Maximum 0.25µA at 5V
Operating Temperature Range: Must cover -40°C to 125°C minimum
Compliance: ROHS3 compliant, MSL 1 rating

Substitute parts are grouped into two categories: 14-SOIC package direct replacements (pin-compatible) and alternative package options (functional equivalents requiring PCB layout modification).

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Type	Temp Range	Status
LM2901VQDR	Rohm Semiconductor	14-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	CMOS, MOS, Open-Collector, TTL	-40°C ~ 125°C	Obsolete
LM2901D	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 125°C	Active
LM2901DR	Rohm Semiconductor	14-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	CMOS, MOS, Open-Collector, TTL	-40°C ~ 125°C	Obsolete
LM2901DRG3	Texas Instruments	14-SOIC	2V~30V, ±1V~15V	7mV @ 30V	0.25µA @ 5V	Open-Collector	-40°C ~ 125°C	Active
LM2901M	onsemi	14-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	DTL, MOS, Open-Collector, TTL	-40°C ~ 85°C	Obsolete
CMP04FSZ	Analog Devices Inc.	14-SOIC	3.3V~36V, ±1.65V~18V	1mV @ 5V	0.1µA @ 5V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 85°C	Active
LM139ADT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	—	-55°C ~ 125°C	Active
LM139DT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	—	-55°C ~ 125°C	Active
LM239APT	STMicroelectronics	14-TSSOP	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 105°C	Active
LM239PT	STMicroelectronics	14-TSSOP	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 105°C	Active
LM239QT	STMicroelectronics	16-QFN (3x3)	2V~36V, ±1V~18V	5mV	0.25µA @ 5V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 105°C	Active

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (14-SOIC Package)

For applications requiring immediate drop-in replacement without PCB modification, the following active parts maintain electrical and mechanical compatibility:

LM2901D (STMicroelectronics): Identical package, matching temperature range (-40°C to 125°C), and equivalent electrical specifications. Supply voltage range is slightly reduced (2V~32V vs. 2V~36V), which is acceptable for most 5V and 3.3V systems. ROHS3 compliant.
LM2901DRG3 (Texas Instruments): Pin-compatible 14-SOIC package with active product status. Temperature range matches the original (-40°C to 125°C). Supply voltage range is reduced to 2V~30V. Output type is limited to open-collector. ROHS3 compliant.
CMP04FSZ (Analog Devices Inc.): 14-SOIC package with superior electrical performance (1mV input offset vs. 7mV, 0.1µA input bias vs. 0.25µA). Supply voltage minimum is raised to 3.3V, which may limit use in 2V applications. Operating temperature range is -40°C to 85°C. ROHS3 compliant.

Alternative Package Options (Functional Equivalents)

For designs permitting PCB layout changes, the following parts offer active product status and extended availability:

LM239APT / LM239PT (STMicroelectronics): 14-TSSOP package (0.173", 4.40mm width) with 4 comparators. Supply voltage range 2V~32V. Both are ROHS3 compliant and active. LM239APT offers 2mV input offset; LM239PT offers 5mV input offset. Operating temperature -40°C to 105°C.
LM239QT (STMicroelectronics): 16-QFN (3x3) package with 4 comparators. Supply voltage range 2V~36V matches the original. ROHS3 compliant and active. Operating temperature -40°C to 105°C.

Compliance and Regulatory Status

All recommended substitute parts maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity) ratings, ensuring compatibility with standard manufacturing and storage practices. All parts are classified as REACH unaffected and carry EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LM2901D replace LM2901VQDR directly on the PCB?

A: Yes. Both use the 14-SOIC package with identical pinout and footprint. The LM2901D is pin-compatible and electrically equivalent for most applications. The supply voltage range is slightly reduced (2V~32V vs. 2V~36V), which does not affect standard 5V or 3.3V designs.

Q: What is the difference between LM2901 and LM239 series?

A: Both are 4-channel general-purpose comparators with similar electrical characteristics. The LM239 series is available in alternative packages (14-TSSOP, 16-QFN) and typically has active product status, while LM2901 variants are more commonly found in 14-SOIC packages. Functional performance is equivalent when package constraints are not a factor.

Q: Does CMP04FSZ offer better performance than LM2901VQDR?

A: CMP04FSZ provides superior input offset voltage (1mV vs. 7mV) and lower input bias current (0.1µA vs. 0.25µA). However, the minimum supply voltage is raised to 3.3V, restricting use in 2V applications. The operating temperature range is also reduced to -40°C to 85°C. Substitution is appropriate only if the 3.3V minimum supply voltage and 85°C maximum temperature are acceptable.

Q: Are LM139ADT and LM139DT interchangeable?

A: Both are STMicroelectronics 14-SOIC comparators with identical package and pinout. LM139ADT offers 2mV input offset at 30V; LM139DT offers 5mV input offset at 30V. Both support the full -55°C to 125°C temperature range. Selection depends on input offset voltage requirements for the specific application.

Q: What is the advantage of 16-QFN package (LM239QT) over 14-SOIC?

A: The 16-QFN package offers a smaller footprint (3x3mm) compared to 14-SOIC, enabling higher circuit density. LM239QT maintains the full supply voltage range (2V~36V) and is ROHS3 compliant. PCB layout redesign is required for package migration.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed carry ROHS3 compliance certification, ensuring compatibility with environmental and regulatory requirements equivalent to the original LM2901VQDR.

Q: Which substitute offers the widest operating temperature range?

A: LM139ADT and LM139DT both support -55°C to 125°C, extending the lower temperature limit to -55°C compared to the original -40°C minimum. This is beneficial for industrial and automotive applications requiring extended cold-temperature operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message