LM339MX Equivalent & Substitute Parts

Part Overview

The LM339MX is a general-purpose comparator IC manufactured by Rohm Semiconductor in a 14-SOIC surface-mount package. This device integrates four independent comparators with CMOS, DTL, ECL, MOS, Open-Collector, and TTL output compatibility, operating across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The part is currently active in production with 22,600 units in stock. Equivalent and substitute parts are necessary when addressing supply constraints, specific automotive qualifications, alternative packaging requirements, or extended temperature range specifications.

Key Parameters

Parameter	LM339MX
Manufacturer	Rohm Semiconductor
Number of Elements	4
Output Type	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM339MX is determined by the following critical parameters:

Number of comparator elements (must be 4)
Package type and physical dimensions (14-SOIC surface mount preferred for direct replacement)
Supply voltage range compatibility (minimum 2V ~ 36V single supply or ±1V ~ ±18V dual supply)
Input offset voltage specification (5mV @ 30V or better)
Input bias current (0.25µA @ 5V or lower)
Output current capability (16mA @ 5V or higher)
Quiescent current (2.5mA or lower)
RoHS3 compliance and MSL rating

Substitute parts are categorized as follows:

Direct Substitutes (14-SOIC Surface Mount): Parts with identical package, pinout, and electrical specifications within the allowed parameter ranges. These include LM2901QDRQ1, LM2901VQDRG4Q1, and LM2901QDRG4Q1 from Texas Instruments.

Similar Substitutes (Alternative Packages): Parts with equivalent electrical performance but different package types (14-CDIP through-hole or 14-DIP) or from alternative manufacturers (STMicroelectronics LM139 and LM239 series). These require PCB layout modifications.

Compatible Alternatives (Extended Temperature Range): Parts with automotive-grade qualifications (AEC-Q100) and extended operating temperature ranges (-40°C to 125°C), suitable for demanding applications.

Parameter Comparison

Parameter	LM339MX (Rohm)	LM2901QDRQ1 (TI)	LM2901VQDRG4Q1 (TI)	LM2901QDRG4Q1 (TI)	LM139AJ/PB (TI)	LM139DT (STM)	LM239D (STM)	LM239DR (TI)	LM239DRG3 (TI)	LM239J (TI)	LM239N (TI)
Number of Elements	4	4	4	4	4	4	4	4	4	4	4
Output Type	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector	Open-Collector	Open-Collector	Open-Collector, Open-Drain	Open-Collector, Open-Drain	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector	Open-Collector	Open-Collector	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 32V, ±1V ~ 16V	2V ~ 32V, ±1V ~ 16V	2V ~ 30V, ±1V ~ 15V	2V ~ 30V, ±1V ~ 15V	2V ~ 36V, ±1V ~ 18V	2V ~ 30V, ±1V ~ 15V
Voltage - Input Offset (Max)	5mV @ 30V	7mV @ 5V	7mV @ 5V	7mV @ 5V	2mV @ 30V	5mV @ 30V	5mV @ 30V	5mV @ 30V	5mV @ 30V	5mV @ 30V	5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V	20mA	20mA	20mA	16mA @ 5V	16mA @ 5V	16mA @ 5V	20mA	20mA	16mA @ 5V	20mA
Current - Quiescent (Max)	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	2mA	2mA	2mA	2mA	2.5mA	2mA
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-CDIP	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-CDIP	14-DIP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Last Time Buy	Last Time Buy	Active	Active	Active	Active	Last Time Buy	Active	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (14-SOIC Surface Mount):

LM2901QDRQ1 from Texas Instruments is the primary direct substitute. It maintains identical package geometry, pinout, and supply voltage range (2V ~ 36V, ±1V ~ 18V). The part is currently active in production with 1,285 units in stock. This device includes AEC-Q100 automotive qualification and operates across -40°C to 125°C, extending the temperature range beyond the LM339MX. Input offset voltage is specified at 7mV @ 5V (compared to 5mV @ 30V for the LM339MX), and output current is rated at 20mA (versus 16mA for the original). All parts are ROHS3 compliant with MSL 1 rating.

LM2901VQDRG4Q1 and LM2901QDRG4Q1 are functionally equivalent alternatives with identical electrical specifications and automotive qualification. LM2901VQDRG4Q1 is available in higher quantity (41,350 units) but carries Last Time Buy status. LM2901QDRG4Q1 is supplied in Tape & Reel packaging with 2,800 units available.

For Extended Temperature Range Applications:

LM139AJ/PB (Texas Instruments, 14-CDIP through-hole) and LM139DT (STMicroelectronics, 14-SOIC surface mount) both operate from -55°C to 125°C. The LM139AJ/PB features superior input offset voltage of 2mV @ 30V and lower input bias current of 0.1µA @ 5V. LM139DT maintains the 14-SOIC package with 18,338 units in stock and operates from -55°C to 125°C.

For Industrial Temperature Range (Narrower Specification):

LM239 series devices from both Texas Instruments and STMicroelectronics provide alternatives with operating ranges from -25°C to 85°C or -40°C to 105°C. LM239DR (Texas Instruments, 14-SOIC) offers 157,700 units in stock with active product status. LM239DRG3 (Texas Instruments, Tape & Reel) is available with 85,300 units but carries Last Time Buy status.

For Through-Hole PCB Designs:

LM239J (Texas Instruments, 14-CDIP) and LM239N (Texas Instruments, 14-DIP) provide equivalent functionality in through-hole packages with 5,051 and 25,013 units in stock respectively. Both maintain active product status.

All recommended substitutes are ROHS3 compliant with MSL 1 rating and REACH unaffected status, ensuring regulatory compliance across industrial and automotive applications.

Frequently Asked Questions (FAQ)

Q: Can LM2901QDRQ1 replace LM339MX in existing designs without PCB modification?

A: Yes. Both devices use identical 14-SOIC packaging with matching pinout and physical dimensions (0.154" width, 3.90mm). No PCB layout changes are required. Electrical specifications are compatible within the allowed parameter ranges for supply voltage, input offset, bias current, and output current.

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

A: The primary difference is supply voltage range. LM2901 devices support 2V ~ 36V (±1V ~ 18V dual), while LM239 devices are limited to 2V ~ 30V (±1V ~ 15V dual). LM239 series also features lower quiescent current (2mA versus 2.5mA). Both maintain four independent comparators in 14-SOIC packages.

Q: Why do some substitutes show "Last Time Buy" status?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for that specific part number. While current inventory is available, future procurement may not be possible. For long-term designs, prioritize parts with Active status such as LM2901QDRQ1, LM139DT, or LM239DR.

Q: Can I use through-hole packages (LM239J, LM239N) as substitutes for the surface-mount LM339MX?

A: Electrically, yes. However, through-hole packages require different PCB footprints and assembly processes. This substitution is practical only if your design already accommodates through-hole components or if you are redesigning the PCB layout.

Q: What is the significance of AEC-Q100 qualification on LM2901 devices?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability standards. LM2901QDRQ1, LM2901VQDRG4Q1, and LM2901QDRG4Q1 all carry this certification, making them suitable for automotive and high-reliability applications. The LM339MX does not list automotive qualification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance of the LM339MX.

Q: Which substitute offers the best input offset voltage specification?

A: LM139AJ/PB specifies 2mV @ 30V input offset voltage, superior to the LM339MX specification of 5mV @ 30V. This part is available in 14-CDIP through-hole package with 1,416 units in stock.

Q: Can I substitute LM239DR for LM339MX if my application operates at temperatures below -25°C?

A: No. LM239DR operates from -25°C to 85°C. For applications requiring operation below -25°C, use LM139AJ/PB (-55°C to 125°C) or LM139DT (-55°C to 125°C).

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