LM339MX Equivalent & Substitute Parts

Part Overview

The LM339MX is a general-purpose comparator IC manufactured by onsemi, featuring four independent comparators in a 14-SOP surface-mount package. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is designed for applications requiring low-power comparison operations with open-collector, TTL, MOS, and DTL output compatibility.

The LM339MX is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades. Direct replacements and functionally equivalent alternatives are available from multiple manufacturers with active product status.

Key Parameters

Parameter	LM339MX
Manufacturer	onsemi
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Elements	4
Type	General Purpose
Output Type	DTL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	18mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	Not specified
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM339MX is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 14-SOIC surface-mount packaging with 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Electrical Specifications: Substitute parts must support the minimum supply voltage range of 2V to 36V (single supply) and ±1V to ±18V (dual supply). Input offset voltage, input bias current, and output current specifications must be within acceptable tolerances for the application.

Output Configuration: The LM339MX features open-collector output with DTL, MOS, and TTL compatibility. Substitute parts must provide open-collector output capability to maintain circuit functionality.

Number of Comparators: All substitute parts must contain four independent comparators within a single package.

Operating Temperature Range: Substitute parts operating at 0°C to 70°C are direct replacements. Parts with extended temperature ranges (-40°C to 85°C or -55°C to 125°C) are functionally equivalent and provide enhanced reliability for wider environmental conditions.

Product Status: Active-status parts are preferred for new designs and ongoing production. Last-time-buy and obsolete parts should be evaluated based on inventory availability and long-term supply chain requirements.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage (Single)	Supply Voltage (Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
LM339MX	onsemi	14-SOIC	2V ~ 36V	±1V ~ 18V	5mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	Obsolete
LM339DR2G	onsemi	14-SOIC	3V ~ 36V	±1.5V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
AS339AMTR-E1	Diodes Incorporated	14-SOIC	2V ~ 36V	±1V ~ 18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	Active
AS339MTR-E1	Diodes Incorporated	14-SOIC	2V ~ 36V	±1V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	Active
BA2901SF-E2	Rohm Semiconductor	14-SOIC	2V ~ 36V	±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM139AD	Texas Instruments	14-SOIC	2V ~ 30V	±1V ~ 15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	Last Time Buy
LM139ADT	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Active
LM139DT	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Active
LM239ADT	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM239DT	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM2901AVQDR	Texas Instruments	14-SOIC	2V ~ 32V	±1V ~ 16V	2mV @ 32V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Recommendation: LM339DR2G (onsemi)

The LM339DR2G is the direct onsemi equivalent with active product status. It maintains the same base product architecture as the LM339MX with identical package geometry and electrical performance within the specified operating temperature range. This part is recommended for designs requiring continuity with the original LM339MX specification and is available in high inventory (205,200 pcs).

Alternative Selections by Application Requirements:

For applications requiring extended operating temperature range (-40°C to 85°C), the AS339AMTR-E1 and AS339MTR-E1 from Diodes Incorporated provide active-status alternatives with full supply voltage compatibility and improved input offset specifications. Both parts maintain the 14-SOIC package footprint and open-collector output configuration.

For designs tolerating wider temperature operation (-55°C to 125°C), the LM139ADT and LM139DT from STMicroelectronics, along with LM239ADT and LM239DT variants, offer enhanced environmental performance. These parts support the full 2V to 36V supply range and maintain electrical compatibility with the LM339MX.

The BA2901SF-E2 from Rohm Semiconductor provides an alternative with extended temperature range (-40°C to 105°C) and ROHS3 compliance certification.

Compliance Considerations:

All recommended substitute parts carry ROHS3 compliance certification and REACH unaffected status, ensuring regulatory alignment for modern production environments. Moisture sensitivity levels are uniformly rated at MSL 1 (unlimited) or MSL 3 (168 hours), supporting standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the LM339DR2G directly replace the LM339MX without PCB modifications?

A: Yes. The LM339DR2G shares identical 14-SOIC package dimensions (0.154" width, 3.90mm) and pin configuration with the LM339MX. No PCB layout changes are required for direct substitution.

Q: What is the minimum supply voltage difference between LM339MX and LM339DR2G?

A: The LM339MX supports 2V minimum single-supply operation, while the LM339DR2G requires 3V minimum. For applications operating below 3V, the LM339MX or alternative parts with 2V minimum specification (AS339AMTR-E1, AS339MTR-E1, BA2901SF-E2) must be selected.

Q: Are there functional differences between onsemi LM339 variants and Diodes Incorporated AS339 variants?

A: Both product families implement four-element general-purpose comparators with open-collector output in 14-SOIC packaging. Electrical specifications are comparable within specified operating ranges. The primary differences are manufacturer-specific certifications, temperature ratings, and inventory availability.

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

A: The LM139AD and LM239ADT from Texas Instruments and STMicroelectronics respectively specify 2mV maximum input offset voltage at 30V, compared to 5mV for the LM339MX. The AS339AMTR-E1 specifies 3mV at 5V. Selection depends on application sensitivity requirements.

Q: Is the LM2901AVQDR suitable for high-temperature applications?

A: Yes. The LM2901AVQDR operates across -40°C to 125°C, providing the widest temperature range among available substitutes. It maintains 2V to 32V single-supply operation and 20mA typical output current, making it suitable for industrial and automotive environments.

Q: What packaging options are available for LM339 equivalents?

A: All listed substitute parts use 14-SOIC surface-mount packaging with 0.154" (3.90mm) width. Packaging variants (Cut Tape, Digi-Reel, Tape & Reel, Tube) affect delivery format and handling but do not alter electrical or mechanical compatibility.

Q: Are there single-comparator alternatives if four comparators are not required?

A: The provided substitute list contains only four-element comparator packages. Single-comparator devices require separate part number research and are outside the scope of LM339MX equivalency.

Q: Which substitute part has the highest current output capability?

A: The LM139AD and LM2901AVQDR both specify 20mA typical output current, compared to 18mA for the LM339MX. Most other substitutes specify 16mA, which remains adequate for standard open-collector applications.

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