LM339J Equivalent & Substitute Parts

Part Overview

The LM339J is a general-purpose comparator IC manufactured by Texas Instruments, housed in a 14-CDIP through-hole package. This device contains four independent differential comparators with open-collector outputs, designed for applications requiring voltage comparison across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply). The LM339J maintains active product status with 5,237 units in current inventory. Substitute parts are necessary when design requirements demand alternative package formats (surface mount versus through-hole), extended operating temperature ranges, or different supply voltage specifications while maintaining functional equivalence in comparator operation.

Key Parameters

Parameter	LM339J Specification
Number of Elements	4
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V
Voltage - Input Offset (Max)	3mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
Package / Case	14-CDIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM339J is determined by the following critical parameters:

Functional Equivalence Requirements:

Four independent differential comparators (Number of Elements = 4)
Open-collector output configuration
Supply voltage range compatibility: minimum 2V single supply or ±1V dual supply; maximum 30V single supply or ±15V dual supply
Input offset voltage not exceeding 3mV at 30V
Input bias current not exceeding 0.25µA at 5V
Output current capability minimum 20mA typical
Quiescent current not exceeding 2.5mA

Package and Mounting Considerations: Substitutes are grouped by mounting technology (through-hole versus surface mount) and package form factor. Through-hole packages (14-CDIP, 14-DIP) maintain direct PCB compatibility. Surface-mount packages (14-SOIC, 14-SSOP) require different assembly processes but provide equivalent electrical function.

Operating Temperature Range: The LM339J operates from 0°C to 70°C. Substitutes with extended temperature ranges (such as -25°C to 85°C or -40°C to 105°C) provide broader environmental capability while remaining functionally compatible.

Compliance and Status: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching the LM339J certification profile.

Parameter Comparison

Part Number	Manufacturer	Package Type	Mounting	Supply Voltage Range	Input Offset (Max)	Output Type	Operating Temp	Status
LM339J	Texas Instruments	14-CDIP	Through Hole	2V~30V, ±1V~15V	3mV @ 30V	Open-Collector	0°C ~ 70°C	Active
LM139J/PB	Texas Instruments	14-CDIP	Through Hole	2V~36V, ±1V~18V	5mV @ 30V	Open-Collector, Open-Drain	-55°C ~ 125°C	Active
LM239J	Texas Instruments	14-CDIP	Through Hole	2V~36V, ±1V~18V	5mV @ 30V	Open-Collector	-25°C ~ 85°C	Active
LM239N	Texas Instruments	14-DIP	Through Hole	2V~30V, ±1V~15V	5mV @ 30V	Open-Collector	-25°C ~ 85°C	Active
LM239DR	Texas Instruments	14-SOIC	Surface Mount	2V~30V, ±1V~15V	5mV @ 30V	Open-Collector	-25°C ~ 85°C	Active
LM239DRG3	Texas Instruments	14-SOIC	Surface Mount	2V~30V, ±1V~15V	5mV @ 30V	Open-Collector	-25°C ~ 85°C	Last Time Buy
LM239D	STMicroelectronics	14-SOIC	Surface Mount	2V~32V, ±1V~16V	5mV @ 30V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 105°C	Active
LM339D	STMicroelectronics	14-SOIC	Surface Mount	2V~32V, ±1V~16V	5mV @ 30V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	0°C ~ 70°C	Active
LM339DBR	Texas Instruments	14-SSOP	Surface Mount	2V~30V, ±1V~15V	5mV @ 30V	Open-Collector	0°C ~ 70°C	Active
LM339DR	Rohm Semiconductor	14-SOIC	Surface Mount	2V~36V, ±1V~18V	7mV @ 5V	CMOS, MOS, Open-Collector, TTL	0°C ~ 70°C	Obsolete
LM339M	National Semiconductor	14-SOIC	Surface Mount	2V~36V, ±1V~18V	5mV @ 5V	Open-Collector	0°C ~ 70°C	Active

Engineering Selection Recommendations

Through-Hole Package Substitutes (Direct PCB Compatibility):

LM239J and LM139J/PB maintain the 14-CDIP through-hole form factor. LM239J provides extended operating temperature range (-25°C to 85°C) and increased supply voltage capability (2V to 36V single supply, ±1V to ±18V dual supply) while preserving the same package footprint. LM139J/PB extends temperature range further (-55°C to 125°C) and adds open-drain output capability alongside open-collector. LM239N uses 14-DIP packaging, functionally equivalent to LM339J with extended temperature operation.

Surface-Mount Package Substitutes (Assembly Process Change Required):

LM239DR and LM239DRG3 provide 14-SOIC surface-mount equivalents with identical electrical specifications to LM339J. LM239DRG3 carries Last Time Buy status, indicating discontinued production; LM239DR is the recommended active alternative. LM339DBR offers 14-SSOP surface-mount packaging with matching electrical performance. STMicroelectronics LM239D and LM339D provide 14-SOIC alternatives with extended temperature ranges and broader output type compatibility (CMOS, DTL, ECL, MOS, TTL in addition to open-collector).

Compliance and Availability:

All active-status substitutes maintain ROHS3 compliance and REACH unaffected certification. LM339DR (Rohm Semiconductor) carries obsolete status and should be avoided for new designs. LM339M (National Semiconductor) remains active with surface-mount 14-SOIC packaging.

Frequently Asked Questions (FAQ)

Q: Can I substitute LM239J for LM339J in a through-hole application?

A: Yes. LM239J maintains 14-CDIP through-hole packaging and four open-collector comparators. It operates within the LM339J supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and meets input offset and bias current specifications. LM239J extends operating temperature to -25°C to 85°C, providing broader environmental capability.

Q: What is the difference between LM239DR and LM239DRG3?

A: Both use 14-SOIC surface-mount packaging with identical electrical specifications. LM239DRG3 is marked Last Time Buy, indicating production discontinuation. LM239DR is the active alternative for new designs and should be selected for long-term availability.

Q: Can I use a surface-mount package substitute in place of the through-hole LM339J?

A: Surface-mount substitutes (LM239DR, LM339DBR, LM339M) require different PCB assembly processes and cannot be directly installed in through-hole footprints. They are suitable only for designs using surface-mount assembly technology.

Q: Does LM139J/PB provide better performance than LM339J?

A: LM139J/PB maintains the same 14-CDIP through-hole package and four-comparator configuration. It extends supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and operating temperature (-55°C to 125°C). Input offset voltage increases to 5mV at 30V. Selection depends on application requirements for extended temperature or voltage range.

Q: Are STMicroelectronics LM239D and LM339D direct replacements?

A: Both provide 14-SOIC surface-mount packaging with four comparators and open-collector output capability. They operate within compatible supply voltage ranges (2V to 32V single supply, ±1V to ±16V dual supply). LM239D supports extended temperature operation (-40°C to 105°C). Both offer broader output type compatibility (CMOS, DTL, ECL, MOS, TTL) compared to LM339J open-collector only. Electrical performance is equivalent for standard comparator applications.

Q: What is the MSL rating significance for these parts?

A: All listed substitutes carry MSL 1 (Unlimited) or equivalent ratings, indicating no moisture sensitivity restrictions during storage or handling. This matches the LM339J MSL 1 classification, ensuring equivalent reliability in standard manufacturing environments.

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