LM339NG Equivalent & Substitute Parts

Part Overview

The LM339NG is a general-purpose quad comparator IC manufactured by onsemi, housed in a 14-DIP through-hole package. This device features four independent comparators with open-collector, TTL, and CMOS output configurations, operating across a wide supply voltage range of 3V to 36V (single supply) or ±1.5V to ±18V (dual supply). The LM339NG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Package Type	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Number of Elements	4
Output Type	CMOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	3V ~ 36V, ±1.5V ~ 18V
Input Offset Voltage (Max)	5mV @ 5V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	16mA @ 5V
Quiescent Current (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM339NG is determined by the following critical parameters:

Package compatibility: 14-DIP through-hole mounting for direct PCB replacement
Functional equivalence: Four independent comparators with matching output types
Electrical specifications: Supply voltage range, input offset voltage, bias current, and output current ratings
Operating temperature range: Minimum -25°C to maximum 85°C preferred for active products
Pin configuration: Identical 14-pin DIP pinout

Substitute parts are grouped into two categories:

Direct Replacements (14-DIP Through-Hole): Parts maintaining identical package and pinout, enabling direct PCB substitution without layout modifications.

Functional Equivalents (Alternative Packages): Parts with matching electrical specifications but different package types (14-SOIC, 16-QFN), requiring PCB redesign but offering improved performance or compliance status.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Output Type	Supply Voltage	Input Offset (Max)	Quiescent Current (Max)	Operating Temp	Product Status	RoHS Status
LM339NG	onsemi	14-DIP	Through Hole	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	2.5mA	0°C ~ 70°C	Obsolete	REACH Unaffected
LM339AN/NOPB	Texas Instruments	14-DIP	Through Hole	Open-Collector	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	2.5mA	-25°C ~ 85°C	Active	ROHS3 Compliant
LM339AN	Harris Corporation	14-DIP	Through Hole	Open-Collector	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	2.5mA	0°C ~ 70°C	Obsolete	RoHS non-compliant
LM339N	STMicroelectronics	14-DIP	Through Hole	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	2.5mA	0°C ~ 70°C	Obsolete	ROHS3 Compliant
LM339ADT	STMicroelectronics	14-SOIC	Surface Mount	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	2.5mA	0°C ~ 70°C	Active	ROHS3 Compliant
LM139DT	STMicroelectronics	14-SOIC	Surface Mount	Open-Collector	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	2mA	-55°C ~ 125°C	Active	ROHS3 Compliant
LM2901D	STMicroelectronics	14-SOIC	Surface Mount	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	7mV @ 5V	2.5mA	-40°C ~ 125°C	Active	ROHS3 Compliant
LM2901Q4T	STMicroelectronics	16-QFN (3x3)	Surface Mount	CMOS, DTL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	—	2.5mA	—	Active	ROHS3 Compliant
LM2901N	National Semiconductor	14-DIP	Through Hole	—	—	—	—	—	Active	REACH Unaffected
LM3302N	Harris Corporation	—	—	—	—	—	—	—	Active	REACH Unaffected

Engineering Selection Recommendations

For Direct Through-Hole PCB Replacement (No Layout Changes)

LM339AN/NOPB (Texas Instruments) is the primary recommended direct replacement. It maintains the 14-DIP through-hole package, provides improved input offset voltage specification (2mV vs. 5mV), and carries active product status with ROHS3 compliance. The extended operating temperature range (-25°C to 85°C) exceeds the original LM339NG specification.

LM339N (STMicroelectronics) provides an alternative direct replacement in 14-DIP packaging with ROHS3 compliance and active status. Input offset voltage matches the original specification at 5mV @ 30V.

For Surface-Mount Redesign (Improved Performance)

LM339ADT (STMicroelectronics) offers active product status, ROHS3 compliance, and improved input offset voltage (2mV @ 30V) in a 14-SOIC surface-mount package. This option suits new designs or PCB revisions prioritizing compliance and performance.

LM139DT (STMicroelectronics) provides the widest operating temperature range (-55°C to 125°C) in 14-SOIC packaging with active status and ROHS3 compliance, suitable for extended-temperature applications.

LM2901D (STMicroelectronics) extends the operating temperature range to -40°C to 125°C in 14-SOIC packaging with active status and ROHS3 compliance.

LM2901Q4T (STMicroelectronics) offers the most compact footprint in 16-QFN (3x3) surface-mount packaging with active status and ROHS3 compliance, supporting the widest supply voltage range (2V ~ 36V, ±1V ~ 18V).

Compliance Considerations

All recommended active substitutes carry ROHS3 compliance certification. The LM339AN (Harris Corporation) and LM339N (STMicroelectronics) variants marked as obsolete should be avoided for new designs unless legacy compatibility is mandatory.

Frequently Asked Questions (FAQ)

Q: Can LM339AN/NOPB directly replace LM339NG without PCB modifications?

A: Yes. Both parts use identical 14-DIP through-hole packaging with matching pinouts. LM339AN/NOPB is electrically compatible and offers improved specifications (lower input offset voltage, extended temperature range) and active product status.

Q: What is the key difference between 14-DIP and 14-SOIC packages?

A: 14-DIP is a through-hole package requiring drilled PCB holes for insertion. 14-SOIC is a surface-mount package soldered directly to PCB pads. Through-hole packages are suitable for breadboarding and legacy designs; surface-mount packages reduce PCB size and support automated assembly.

Q: Are all substitute parts functionally equivalent to LM339NG?

A: All listed parts are quad comparators with four independent elements and matching output configurations. Electrical specifications vary within acceptable ranges for general-purpose comparator applications. Verify specific application requirements (input offset voltage, temperature range, supply voltage) against datasheet specifications before selection.

Q: Why is LM339NG marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts with active status ensure long-term availability and ongoing manufacturer support.

Q: Which substitute offers the best compliance for new designs?

A: LM339AN/NOPB (Texas Instruments) for through-hole applications and LM339ADT or LM139DT (STMicroelectronics) for surface-mount applications all carry ROHS3 compliance and active product status, making them suitable for modern design requirements.

Q: Can I use LM2901Q4T as a replacement if I redesign the PCB?

A: Yes. LM2901Q4T provides four independent comparators in a compact 16-QFN surface-mount package with active status and ROHS3 compliance. PCB redesign is required due to different package footprint and pinout, but electrical performance is compatible for general-purpose comparator applications.

Q: What is the significance of input offset voltage differences between parts?

A: Input offset voltage determines the accuracy of voltage comparison. Lower values (2mV) provide better precision than higher values (5mV or 7mV). For precision applications, select parts with lower input offset voltage specifications. For general-purpose applications, differences within 5mV are typically acceptable.

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