LM239N Equivalent & Substitute Parts

Part Overview

The LM239N is a quad comparator integrated circuit in 14-DIP packaging, manufactured by onsemi. This device functions as a general-purpose voltage comparator with single supply operation, designed for applications requiring precision voltage comparison across industrial and consumer electronics. The LM239N is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain functional equivalence in comparator operation while accommodating packaging and electrical specification variations.

Key Parameters

Parameter	LM239N (onsemi)
Manufacturer	onsemi
Category	Linear - Comparator
Packaging	14-DIP
Number of Elements	4
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level	1 (Unlimited)
REACH Status	REACH Unaffected
Inventory Status	25013 Pcs New Original In Stock

Substitute Part Grouping Explanation

Substitution for the LM239N is determined by the following critical parameters:

Functional Equivalence Criteria:

Number of comparator elements: 4 (quad configuration)
Comparator type: General purpose voltage comparator
Output type compatibility: Open-Collector or equivalent switching capability
Supply voltage range: Minimum 2V single supply operation
Input offset voltage: Maximum 7mV at specified conditions
Input bias current: Maximum 0.25µA at 5V
Output current capability: Minimum 16mA at 5V

Packaging Considerations:

Primary substitute: 14-DIP (through-hole, direct pin-compatible)
Secondary substitutes: 14-SOIC (surface mount, functional equivalent with different mounting)
Tertiary substitutes: 24-SOIC (functional equivalent with expanded feature set, requires PCB redesign)

Compliance & Status:

Active product status preferred for long-term availability
RoHS3 compliance required for new designs in regulated markets
Moisture sensitivity level 1 or 3 acceptable depending on assembly process

Parameter Comparison

Parameter	LM239N (onsemi)	LM239D (STMicroelectronics)	LM239N (Texas Instruments)	LM2901MX/NOPB (Texas Instruments)	CMP04FSZ (Analog Devices)	LM2901HYDT (STMicroelectronics)
Manufacturer	onsemi	STMicroelectronics	Texas Instruments	Texas Instruments	Analog Devices Inc.	STMicroelectronics
Package Type	14-DIP	14-SOIC	14-DIP	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Through Hole	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount
Number of Elements	4	4	4	4	4	4
Output Type	Open-Collector	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector	Open-Collector	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage - Supply Single (Min-Max)	2V ~ 30V	2V ~ 32V	2V ~ 30V	2V ~ 36V	3.3V ~ 36V	2V ~ 36V
Voltage - Supply Dual (Min-Max)	±1V ~ 15V	±1V ~ 16V	±1V ~ 15V	±1V ~ 18V	±1.65V ~ 18V	±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 30V	5mV @ 30V	5mV @ 30V	7mV @ 30V	1mV @ 5V	Not specified
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	Not specified
Current - Output (Typ)	20mA	16mA @ 5V	20mA	16mA @ 5V	16mA @ 5V	Not specified
Current - Quiescent (Max)	2mA	2mA	2mA	2.5mA	3mA	2.5mA
Operating Temperature	-25°C ~ 85°C	-40°C ~ 105°C	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	Not specified
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
Inventory	25013 Pcs	22200 Pcs	25013 Pcs	26730 Pcs	1339 Pcs	4310 Pcs

Engineering Selection Recommendations

Direct Pin-Compatible Substitute (14-DIP Packaging): The LM239N from Texas Instruments is the primary direct substitute, offering identical 14-DIP through-hole packaging with active product status and ROHS3 compliance. This part maintains the same pinout and electrical characteristics, requiring no PCB modifications for replacement in existing designs.

Surface Mount Equivalents (14-SOIC Packaging): For new designs or PCB redesigns, the LM2901MX/NOPB from Texas Instruments or LM239D from STMicroelectronics provide functional equivalence in 14-SOIC surface mount packaging. Both parts maintain the quad comparator configuration with compatible electrical specifications and active product status. The LM2901MX/NOPB offers extended supply voltage range (2V ~ 36V) and higher inventory availability.

Extended Feature Substitute (24-SOIC Packaging): The MAX516ACWG+T from Analog Devices Inc./Maxim Integrated provides functional comparator capability in a 24-SOIC package with CMOS and TTL output options. This part requires PCB redesign due to different pinout and package size, but offers active product status and ROHS3 compliance.

Compliance Considerations: All recommended active substitutes meet ROHS3 compliance requirements, suitable for regulated markets. The original LM239N from onsemi is RoHS non-compliant; migration to compliant alternatives is necessary for new production. Moisture sensitivity levels vary; MSL 1 parts are preferred for standard assembly processes, while MSL 3 parts require controlled humidity handling.

Automotive Grade Option: The LM2901YDT from STMicroelectronics provides AEC-Q100 automotive qualification with extended operating temperature range (-40°C ~ 125°C), suitable for automotive and harsh environment applications requiring higher reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the LM239N be directly replaced with the LM239N from Texas Instruments? A: Yes. Both parts share identical 14-DIP packaging and pinout. The Texas Instruments version is active and ROHS3 compliant, making it a direct drop-in replacement. No circuit modifications are required.

Q: What is the difference between 14-DIP and 14-SOIC packages? A: 14-DIP is through-hole mounting for traditional PCBs, while 14-SOIC is surface mount for modern automated assembly. Both packages contain the same die and electrical specifications. Substitution requires PCB redesign and different assembly processes.

Q: Is the LM2901MX/NOPB compatible with the original LM239N? A: Functionally yes, but with packaging differences. The LM2901MX/NOPB is a 14-SOIC surface mount part with identical quad comparator functionality and compatible electrical specifications. It requires PCB redesign and surface mount assembly capability.

Q: Why does the CMP04FSZ have lower input offset voltage (1mV vs 5mV)? A: The CMP04FSZ from Analog Devices Inc. is a higher-precision comparator variant. Lower input offset voltage indicates tighter tolerance and better accuracy. This part is functionally compatible but offers enhanced performance characteristics.

Q: What does RoHS3 compliance mean for substitution? A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, eliminating lead and other restricted materials. For new designs and regulated markets, RoHS3 compliant parts are required. The original LM239N is non-compliant and should be replaced with compliant alternatives.

Q: Can I use the MAX516ACWG+T as a direct replacement? A: No. The MAX516ACWG+T uses 24-SOIC packaging with different pinout and supply voltage range (4.75V ~ 16.5V). This part requires complete PCB redesign and is suitable only for new designs requiring its specific feature set.

Q: What is MSL rating and why does it matter? A: Moisture Sensitivity Level (MSL) indicates how sensitive the component is to moisture during storage and assembly. MSL 1 parts tolerate unlimited moisture exposure, while MSL 3 parts require controlled humidity (168 hours maximum). Choose based on your assembly process capabilities.

Q: Which substitute offers the widest operating temperature range? A: The RT2901HYDT from STMicroelectronics operates from -40°C to 150°C, providing the widest temperature range. This part is suitable for extreme environment applications but requires verification of other electrical specifications for your specific circuit.

Q: Are all substitutes available in high volume? A: Inventory varies. The LM2901MX/NOPB (26730 pcs) and LM239N from Texas Instruments (25013 pcs) offer the highest availability. The CMP04FSZ has lower inventory (1339 pcs). Verify current stock with your supplier for production requirements.

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