LM339MX Equivalent & Substitute Parts

Part Overview

The LM339MX is a general-purpose quad comparator IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This device features open-collector outputs and operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM339MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering improved availability and active product status from alternative manufacturers.

Key Parameters

Parameter	Value	Specification Basis
Number of Elements	4	Quad comparator configuration
Output Type	Open-Collector	Output stage topology
Voltage Supply Range (Single)	2V ~ 36V	Operating voltage envelope
Voltage Supply Range (Dual)	±1V ~ ±18V	Dual supply operation
Voltage Input Offset (Max)	5mV @ 30V	Input accuracy specification
Current Input Bias (Max)	0.25µA @ 5V	Input stage current draw
Current Output (Typ)	16mA @ 5V	Output drive capability
Current Quiescent (Max)	2.5mA	Supply current at rest
Operating Temperature	0°C ~ 70°C	Commercial grade range
Package / Case	14-SOIC (0.154", 3.90mm Width)	Surface mount footprint
Mounting Type	Surface Mount	PCB assembly method
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level	1 (Unlimited)	Handling and storage requirements

Substitute Part Grouping Explanation

Substitution of the LM339MX is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

Number of elements: Must be 4 (quad comparator)
Output type: Must be open-collector
Supply voltage range: Must support 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage: Maximum 5mV @ 30V or equivalent test condition
Input bias current: Maximum 0.25µA @ 5V
Output current: Typical 16mA @ 5V
Package: 14-SOIC (0.154", 3.90mm Width) or equivalent 14-pin SOIC variant
Mounting: Surface mount
Compliance: ROHS3 compliant

Acceptable Parameter Variations:

Operating temperature range may extend beyond 0°C ~ 70°C (wider ranges are acceptable)
Quiescent current up to 2.5mA is acceptable
Input offset voltage specifications at different test conditions (e.g., 3mV @ 5V, 7mV @ 5V) are acceptable if within the 5mV maximum envelope
Moisture sensitivity level may vary (MSL 1 or MSL 3 acceptable)
Packaging format may be Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR)

Substitute parts are grouped by manufacturer and product status. Texas Instruments parametric equivalent LM339MX/NOPB maintains identical specifications with active product status. Diodes Incorporated AS339 series, Rohm Semiconductor BA2901, STMicroelectronics LM139/LM239 series, and onsemi LM239DR2G provide functional equivalence with extended operating temperature ranges and improved availability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply (Single)	Voltage Supply (Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	MSL
LM339MX	Texas Instruments	Obsolete	2V ~ 36V	±1V ~ ±18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	1
LM339MX/NOPB	Texas Instruments	Active	2V ~ 36V	±1V ~ ±18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	1
AS339AMTR-E1	Diodes Incorporated	Active	2V ~ 36V	±1V ~ ±18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	1
AS339MTR-E1	Diodes Incorporated	Active	2V ~ 36V	±1V ~ ±18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	3
AS339MTR-G1	Diodes Incorporated	Active	2V ~ 36V	±1V ~ ±18V	5mV @ 5V	0.25µA @ 5V	16mA	2mA	-40°C ~ 85°C	14-SOIC	3
BA2901SF-E2	Rohm Semiconductor	Active	2V ~ 36V	±1V ~ ±18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	1
LM139ADT	STMicroelectronics	Active	2V ~ 32V	±1V ~ ±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	1
LM139DT	STMicroelectronics	Active	2V ~ 32V	±1V ~ ±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	1
LM239ADT	STMicroelectronics	Active	2V ~ 32V	±1V ~ ±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	1
LM239DR2G	onsemi	Active	3V ~ 36V	±1.5V ~ ±18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	14-SOIC	1
LM239DT	STMicroelectronics	Active	2V ~ 32V	±1V ~ ±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	1

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): LM339MX/NOPB from Texas Instruments is the direct parametric equivalent with identical electrical specifications and 14-SOIC packaging. This part maintains active product status and is the preferred choice for direct substitution where supply voltage range 2V ~ 36V and operating temperature 0°C ~ 70°C are acceptable.

Extended Temperature Range Alternatives: For applications requiring extended operating temperature ranges beyond 0°C ~ 70°C, the following parts provide active product status with wider temperature specifications:

LM139ADT and LM139DT (STMicroelectronics): -55°C ~ 125°C range
LM239ADT and LM239DT (STMicroelectronics): -40°C ~ 105°C range
AS339AMTR-E1, AS339MTR-E1, AS339MTR-G1 (Diodes Incorporated): -40°C ~ 85°C range
BA2901SF-E2 (Rohm Semiconductor): -40°C ~ 105°C range

Supply Voltage Considerations: Most substitute parts maintain the 2V ~ 36V single supply range. The onsemi LM239DR2G operates from 3V ~ 36V (minimum 3V), which is acceptable for applications not requiring operation below 3V. STMicroelectronics LM139 and LM239 series are limited to 2V ~ 32V maximum supply voltage, suitable for applications not exceeding 32V.

Compliance and Certification: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the original LM339MX. Moisture sensitivity levels vary between MSL 1 (unlimited) and MSL 3 (168 hours), with MSL 1 parts preferred for standard handling and storage conditions.

Packaging Format: All substitute parts are available in 14-SOIC surface mount packaging with identical 0.154" (3.90mm) width, ensuring PCB footprint compatibility. Packaging formats include Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) options depending on supplier and part number variant.

Frequently Asked Questions (FAQ)

Q: Can LM339MX/NOPB be used as a direct replacement for LM339MX? A: Yes. LM339MX/NOPB is the parametric equivalent with identical electrical specifications, 14-SOIC packaging, and ROHS3 compliance. The primary difference is active product status versus obsolete status. This is the recommended direct replacement.

Q: What is the key difference between AS339AMTR-E1 and AS339MTR-E1? A: Both are Diodes Incorporated AS339 series parts in 14-SOIC packaging. AS339AMTR-E1 specifies input offset voltage of 3mV @ 5V with MSL 1, while AS339MTR-E1 specifies 5mV @ 5V with MSL 3. Both support the full 2V ~ 36V supply range and -40°C ~ 85°C operating temperature.

Q: Are STMicroelectronics LM139 and LM239 series compatible with LM339MX? A: Yes, with supply voltage limitations. LM139 and LM239 series support 2V ~ 32V maximum supply voltage (versus 2V ~ 36V for LM339MX). They are suitable for applications not exceeding 32V supply. These parts offer extended operating temperature ranges (-55°C ~ 125°C for LM139, -40°C ~ 105°C for LM239) and improved input specifications.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection? A: MSL indicates moisture sensitivity during storage and handling. MSL 1 (unlimited) allows indefinite storage without special precautions. MSL 3 (168 hours) requires baking before reflow if the component has been exposed to moisture for more than 168 hours. For standard manufacturing environments, MSL 1 parts are preferred.

Q: Can onsemi LM239DR2G be used in applications requiring operation below 3V? A: No. LM239DR2G specifies minimum supply voltage of 3V (3V ~ 36V range), whereas LM339MX operates from 2V. For applications requiring 2V operation, use LM339MX/NOPB, AS339 series, or STMicroelectronics LM139/LM239 series.

Q: Is the 14-SOP package of BA2901SF-E2 compatible with 14-SOIC footprints? A: The BA2901SF-E2 uses 14-SOP packaging with 0.173" (4.40mm) width, compared to 14-SOIC 0.154" (3.90mm) width. While pin count and spacing are similar, the wider package body may cause clearance issues on PCBs designed for standard 14-SOIC. Verify PCB layout compatibility before substitution.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging? A: Both are surface mount tape formats. Cut Tape & Digi-Reel® is supplied on standard tape that can be cut to length for manual or semi-automated assembly. Tape & Reel (TR) is supplied on full reels for high-volume automated assembly. Electrical specifications are identical; selection depends on assembly volume and equipment.

Q: Do all substitute parts maintain open-collector output configuration? A: Yes. All listed substitute parts feature open-collector outputs, maintaining functional compatibility with LM339MX designs. Output current specifications (16mA typical @ 5V) are consistent across all parts.

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