LM2901SNG Equivalent & Substitute Parts

Part Overview

The LM2901SNG is a general-purpose quad comparator IC manufactured by onsemi in a 14-DIP through-hole package. This device integrates four independent voltage comparators suitable for precision measurement and signal conditioning applications. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain functional equivalence through matching core electrical parameters while offering alternative packaging options and active product status from multiple manufacturers.

Key Parameters

Parameter	Value	Condition
Number of Elements	4	Quad comparator configuration
Voltage - Input Offset (Max)	7mV	@ 5V
Current - Input Bias (Max)	0.25µA	@ 5V
Current - Output (Typ)	16mA	@ 5V
Current - Quiescent (Max)	2.5mA	Per device
Operating Temperature	-40°C ~ 105°C	Industrial range
Package / Case	14-DIP (0.300", 7.62mm)	Through-hole mounting
Mounting Type	Through Hole	PCB assembly
Moisture Sensitivity Level (MSL)	1 (Unlimited)	No moisture sensitivity

Substitute Part Grouping Explanation

Substitution of the LM2901SNG is determined by the following critical parameters:

Number of Elements: All substitutes must provide 4 independent comparators
Input Offset Voltage: Maximum 7mV @ 5V ensures precision measurement capability
Input Bias Current: Maximum 0.25µA @ 5V maintains high input impedance characteristics
Output Current: Typical 16mA @ 5V provides consistent drive capability
Quiescent Current: Maximum 2.5mA ensures power efficiency
Operating Temperature Range: Minimum -40°C ~ 105°C covers industrial applications
Moisture Sensitivity: MSL 1 (Unlimited) indicates no moisture handling restrictions

Substitute parts are grouped into three categories based on packaging and mounting technology:

Surface Mount SOIC Variants (LM2901DR2G, CMP04FSZ-REEL, LM239ADT, LM2901M/NOPB): 14-SOIC packages for modern PCB assembly
Through-Hole DIP/CDIP Variants (LM139J/PB): 14-CDIP package maintaining through-hole compatibility
Advanced Package Variants (LM339APT, LM339MX, LM339QT): TSSOP and QFN packages for space-constrained applications

All listed substitutes maintain the four-element comparator configuration and core electrical specifications required for functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Status
LM2901SNG	onsemi	14-DIP	Through Hole	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	Obsolete
LM2901DR2G	onsemi	14-SOIC	Surface Mount	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	Active
CMP04FSZ-REEL	Analog Devices Inc.	14-SOIC	Surface Mount	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C	Active
LM139J/PB	Texas Instruments	14-CDIP	Through Hole	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	Active
LM239ADT	STMicroelectronics	14-SOIC	Surface Mount	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM2901M/NOPB	Texas Instruments	14-SOIC	Surface Mount	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM339AD	Motorola	14-SOIC	Surface Mount	2mV @ 5V	0.025µA @ 5V	16mA @ 5V	2mA	0°C ~ 70°C	Active
LM339APT	STMicroelectronics	14-TSSOP	Surface Mount	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM339MX	onsemi	14-SOIC	Surface Mount	5mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	Obsolete
LM339QT	STMicroelectronics	16-QFN (3x3)	Surface Mount	—	—	—	2.5mA	—	Active
MAX516ACWG+T	Analog Devices Inc./Maxim	24-SOIC	Surface Mount	—	0.3µA @ 16.5V	—	10mA	0°C ~ 70°C	Active

Engineering Selection Recommendations

For Direct Through-Hole Replacement: LM139J/PB (Texas Instruments, 14-CDIP) provides the most direct functional replacement while maintaining through-hole mounting. This part offers an extended operating temperature range (-55°C ~ 125°C) and active product status with ROHS3 compliance.

For Surface Mount Migration: LM2901DR2G (onsemi, 14-SOIC) maintains identical electrical specifications to the original LM2901SNG while offering surface-mount packaging. This part is actively manufactured with high inventory availability and ROHS3 compliance, making it suitable for PCB redesign scenarios.

For Enhanced Performance: LM239ADT (STMicroelectronics, 14-SOIC) and CMP04FSZ-REEL (Analog Devices Inc., 14-SOIC) offer improved input offset voltage (2mV and 1mV respectively) and reduced input bias current (0.1µA), providing superior precision while maintaining the four-element comparator configuration and active manufacturing status.

For Space-Constrained Applications: LM339QT (STMicroelectronics, 16-QFN 3x3) provides quad comparator functionality in a compact surface-mount package with active product status and ROHS3 compliance, though with limited electrical parameter documentation.

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, meeting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2901SNG be directly replaced with LM2901DR2G? A: Yes. Both parts are manufactured by onsemi with identical electrical specifications (7mV input offset, 0.25µA input bias, 16mA output current, 2.5mA quiescent current, -40°C ~ 105°C operating range). The primary difference is packaging: LM2901SNG uses 14-DIP through-hole while LM2901DR2G uses 14-SOIC surface-mount. PCB layout modification is required.

Q: What is the difference between 14-DIP, 14-SOIC, and 14-CDIP packages? A: 14-DIP (Dual In-line Package) and 14-CDIP (Ceramic DIP) are through-hole packages with 0.300" (7.62mm) pitch, suitable for breadboards and traditional PCB assembly. 14-SOIC (Small Outline IC) is a surface-mount package with 0.154" (3.90mm) width, requiring reflow soldering and modern PCB design. Pin count and electrical function remain identical across these package variants.

Q: Are all listed substitutes functionally equivalent? A: All substitutes maintain the four-element comparator configuration and core electrical specifications (input offset ≤7mV, input bias ≤0.25µA, output current ≥16mA, quiescent current ≤2.5mA). However, some variants offer improved specifications (lower offset voltage, reduced bias current) or different operating temperature ranges. Verify specific application requirements before selection.

Q: Which substitute offers the best availability? A: LM2901DR2G (onsemi) shows 127,336 pieces in stock, providing the highest inventory availability among active substitutes. LM339MX (onsemi) offers 22,600 pieces but is listed as obsolete. For new designs, prioritize active-status parts with confirmed long-term availability.

Q: Can MAX516ACWG+T replace LM2901SNG? A: MAX516ACWG+T is not a direct substitute. While it is a quad comparator, it uses a 24-SOIC package (larger footprint), operates at different voltage ranges (4.75V ~ 16.5V), and has different quiescent current (10mA vs. 2.5mA). Use only if application requirements specifically match MAX516 specifications.

Q: What compliance certifications should I verify? A: All recommended active substitutes carry ROHS3 compliance and REACH Unaffected status. Verify MSL (Moisture Sensitivity Level) ratings for your assembly process; all listed parts are MSL 1 (Unlimited), requiring no special moisture handling.

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