LM239NG Equivalent & Substitute Parts

Part Overview

The LM239NG is a general-purpose quad comparator IC manufactured by onsemi in 14-DIP through-hole packaging. This device integrates four independent comparators with CMOS, open-collector, and TTL output configurations, operating across a wide supply voltage range of 3V to 36V (single supply) or ±1.5V to ±18V (dual supply). The LM239NG is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional equivalence while offering active product status and improved availability.

Key Parameters

Parameter	LM239NG
Number of Elements	4
Output Type	CMOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	3V ~ 36V, ±1.5V ~ 18V
Voltage - Input Offset (Max)	5mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-25°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LM239NG are grouped based on functional equivalence determined by the following critical parameters:

Number of Elements: 4 comparators
Output Type: CMOS, Open-Collector, TTL compatibility
Voltage - Supply Range: Minimum 3V to 36V single supply or equivalent dual supply
Voltage - Input Offset: Maximum 5mV @ 5V or better
Current - Input Bias: Maximum 0.25µA @ 5V or better
Current - Output: Minimum 16mA @ 5V
Current - Quiescent: Maximum 2.5mA or better
Operating Temperature: Minimum -25°C to 85°C range

Substitutes are available in alternative packaging formats (surface mount SOIC, TSSOP, QFN) and from different manufacturers (STMicroelectronics, Texas Instruments, onsemi). All substitute parts maintain the core electrical specifications required for direct functional replacement, with some variants offering improved performance characteristics or extended temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Mounting Type	Voltage - Supply (±)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
LM239NG	onsemi	14-DIP (0.300", 7.62mm)	Through Hole	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	Obsolete
LM239DR2G	onsemi	14-SOIC (0.154", 3.90mm)	Surface Mount	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM239APT	STMicroelectronics	14-TSSOP (0.173", 4.40mm)	Surface Mount	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM239DT	STMicroelectronics	14-SOIC (0.154", 3.90mm)	Surface Mount	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM239J	Texas Instruments	14-CDIP (0.300", 7.62mm)	Through Hole	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM239N	Texas Instruments	14-DIP (0.300", 7.62mm)	Through Hole	2V ~ 30V, ±1V ~ 15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	Active
LM2901D	STMicroelectronics	14-SOIC (0.154", 3.90mm)	Surface Mount	2V ~ 32V, ±1V ~ 16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2901MX	onsemi	14-SOIC (0.154", 3.90mm)	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 85°C	Obsolete
LM2901Q4T	STMicroelectronics	16-VFQFN Exposed Pad	Surface Mount	2V ~ 36V, ±1V ~ 18V	—	—	—	2.5mA	—	Active
LM3302N	Harris Corporation	—	—	—	—	—	—	—	—	Active
LM339AD	Motorola	14-SOIC (0.154", 3.90mm)	Surface Mount	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	0.025µA @ 5V	16mA @ 5V	2mA	0°C ~ 70°C	Active

Engineering Selection Recommendations

For direct replacement of the obsolete LM239NG in through-hole applications, LM239N (Texas Instruments) and LM239J (Texas Instruments) are the primary equivalents. Both maintain identical 14-DIP/14-CDIP through-hole packaging, active product status, and full electrical compatibility across the specified operating range. LM239N offers slightly higher output current capability (20mA typical) compared to the original specification.

For new designs or surface-mount board transitions, LM239DR2G (onsemi) provides identical electrical specifications in 14-SOIC packaging with active product status and RoHS3 compliance. LM239DT (STMicroelectronics) offers equivalent performance in the same package format with extended operating temperature range (-40°C to 105°C) and active product status.

LM239APT (STMicroelectronics) in 14-TSSOP packaging delivers improved input offset voltage (2mV @ 30V) and reduced input bias current (0.1µA @ 5V) with extended temperature range (-40°C to 105°C) and active product status, suitable for precision applications.

LM2901D and LM2901MX variants provide functional equivalence with extended temperature ranges. LM2901D operates to 125°C, while LM2901MX maintains the original -40°C to 85°C range. Both are available in surface-mount SOIC packaging.

LM339AD (Motorola) offers superior input offset voltage (2mV @ 5V) and significantly reduced input bias current (0.025µA @ 5V), though with a narrower operating temperature range (0°C to 70°C).

All recommended substitutes carry REACH Unaffected status and EAR99 ECCN classification, matching the original part's regulatory compliance profile.

Frequently Asked Questions (FAQ)

Q: Can LM239NG be replaced with LM239N in existing through-hole designs?

A: Yes. LM239N is a direct functional equivalent with identical 14-DIP packaging, matching electrical specifications, and active product status. The primary difference is manufacturer (Texas Instruments vs. onsemi). Both parts operate across the same supply voltage range and temperature specifications.

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

A: Both are quad general-purpose comparators with four independent elements and similar electrical characteristics. The LM2901 series represents an alternative product line with comparable performance. Substitution between LM239 and LM2901 variants is permissible when electrical parameters align, though they are distinct product families.

Q: Are surface-mount substitutes electrically compatible with the through-hole LM239NG?

A: Yes, surface-mount variants (LM239DR2G, LM239DT, LM239APT) maintain electrical equivalence to the LM239NG. The difference is packaging format and mounting technology. PCB layout and assembly methods must be adapted accordingly.

Q: Which substitute offers the best performance improvement?

A: LM239APT and LM339AD both provide superior input offset voltage (2mV vs. 5mV) and reduced input bias current. LM339AD offers the lowest input bias current (0.025µA), while LM239APT provides extended temperature range (-40°C to 105°C) with active product status.

Q: Can LM239NG be used in applications requiring -40°C to 105°C operation?

A: No. The LM239NG operates only to -25°C to 85°C. For extended temperature range applications, use LM239APT, LM239DT, or LM2901D, which all support -40°C to 105°C operation.

Q: What is the significance of "active" vs. "obsolete" product status?

A: Active products are in current production with guaranteed availability and manufacturer support. Obsolete products are no longer manufactured and have limited stock. Transitioning to active substitutes ensures long-term supply chain reliability and access to technical support.

Q: Are all substitutes RoHS3 compliant?

A: Most active substitutes carry RoHS3 compliance. LM239N and LM239J do not specify RoHS status in the provided data. Verify RoHS compliance requirements with the specific manufacturer datasheet for your application.

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