LP339MX Equivalent & Substitute Parts

Part Overview

The LP339MX is a general-purpose quad comparator IC manufactured by Texas Instruments in 14-SOIC surface-mount packaging. This device is classified as obsolete, though 20,051 units remain in stock. The comparator features CMOS, MOS, and open-collector output configurations suitable for analog signal comparison applications across industrial and commercial temperature ranges (0°C to 70°C).

Due to the obsolete product status of the LP339MX, identifying active equivalent and substitute parts is essential for design continuity, long-term supply chain reliability, and new production builds. Active alternatives maintain compatible electrical and mechanical specifications while offering improved availability and extended product lifecycles.

Key Parameters

Parameter	LP339MX
Manufacturer	Texas Instruments
Product Status	Obsolete
Package / Case	14-SOIC (0.154", 3.90mm Width)
Number of Elements	4
Output Type	CMOS, MOS, Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 5V
Current - Input Bias (Max)	0.025µA @ 5V
Current - Output (Typ)	10mA
Current - Quiescent (Max)	100µA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP339MX is determined by strict alignment across the following critical parameters:

Electrical Compatibility:

Number of elements: 4 comparators per package
Supply voltage range: 2V ~ 36V single supply or ±1V ~ 18V dual supply
Output type: Open-collector configuration preferred for direct compatibility
Input offset voltage: Maximum 5mV @ 5V (allows tolerance variation)
Input bias current: Maximum 0.025µA to 0.25µA @ 5V
Output current capability: Minimum 10mA typical

Mechanical Compatibility:

Package: 14-SOIC surface-mount form factor (0.154" to 0.173" width acceptable)
Mounting type: Surface mount only

Regulatory & Environmental:

RoHS3 compliance required
MSL rating: 1 (Unlimited) preferred; MSL 3 acceptable with moisture control
Operating temperature: Minimum -40°C to 85°C or better (extends beyond original 0°C ~ 70°C)

Substitute parts are categorized as direct equivalents (identical specifications), upgrades (enhanced performance or temperature range), or manufacturer-recommended alternatives (functionally compatible with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	MSL
LP339MX	Texas Instruments	Obsolete	14-SOIC (3.90mm)	CMOS, MOS, Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.025µA @ 5V	10mA	100µA	0°C ~ 70°C	1
LP339MX/NOPB	Texas Instruments	Active	14-SOIC (3.90mm)	CMOS, MOS, Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.025µA @ 5V	10mA @ 5V	100µA	0°C ~ 70°C	1
LM2901QS14-13	Diodes Incorporated	Active	14-SOIC (3.90mm)	CMOS, TTL	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	1
LM2901S14-13	Diodes Incorporated	Active	14-SOIC (3.90mm)	Not specified	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	3
AS339AMTR-E1	Diodes Incorporated	Active	14-SOIC (3.90mm)	Open-Collector	2V~36V, ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	1
AS339MTR-E1	Diodes Incorporated	Active	14-SOIC (3.90mm)	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	3
AS339MTR-G1	Diodes Incorporated	Active	14-SOIC (3.90mm)	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA	2mA	-40°C ~ 85°C	3
BA10339F-E2	Rohm Semiconductor	Active	14-SOIC (4.40mm)	Open-Collector	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	1
BA2901F-E2	Rohm Semiconductor	Active	14-SOIC (4.40mm)	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 125°C	1
BA2901SF-E2	Rohm Semiconductor	Active	14-SOIC (4.40mm)	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	1
CMP04FSZ	Analog Devices Inc.	Active	14-SOIC (3.90mm)	CMOS, DTL, ECL, MOS, Open-Collector, TTL	3.3V~36V, ±1.65V~18V	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C	1

Engineering Selection Recommendations

Direct Equivalent (Preferred for Drop-In Replacement):

LP339MX/NOPB is the direct active equivalent manufactured by Texas Instruments. It maintains identical electrical specifications and packaging to the obsolete LP339MX, with the primary difference being active product status and availability in Cut Tape and Digi-Reel packaging formats. This part is suitable for immediate substitution in existing designs without circuit modification.

Manufacturer-Recommended Alternatives (Open-Collector Output):

The AS339AMTR-E1, AS339MTR-E1, and AS339MTR-G1 series from Diodes Incorporated are manufacturer-recommended substitutes with open-collector output configuration. These parts maintain the 2V ~ 36V / ±1V ~ 18V supply range and 14-SOIC package footprint. The AS339AMTR-E1 offers the lowest input offset voltage (3mV @ 5V) and extended temperature range (-40°C ~ 85°C) with MSL 1 rating, making it suitable for demanding applications. The AS339MTR variants provide identical electrical performance with MSL 3 moisture sensitivity, appropriate for controlled storage environments.

Extended Temperature Range Alternatives:

LM2901QS14-13 and BA2901F-E2 extend the operating temperature range to -40°C ~ 125°C and -40°C ~ 125°C respectively, supporting automotive and industrial applications beyond the original 0°C ~ 70°C specification. LM2901QS14-13 includes AEC-Q100 automotive qualification. BA2901F-E2 from Rohm Semiconductor maintains full 2V ~ 36V / ±1V ~ 18V supply compatibility with open-collector output.

Premium Performance Alternative:

CMP04FSZ from Analog Devices Inc. provides superior input offset voltage (1mV @ 5V) and CMRR/PSRR specifications (100dB typical). This part supports extended output type configurations (CMOS, DTL, ECL, MOS, Open-Collector, TTL) and operates across -40°C ~ 85°C. The minimum supply voltage is 3.3V single supply, which may require circuit evaluation for applications operating below this threshold.

Package Footprint Consideration:

BA10339F-E2, BA2901F-E2, and BA2901SF-E2 from Rohm Semiconductor use 14-SOIC packaging with 4.40mm width, compared to the standard 3.90mm width of the LP339MX. While both are 14-SOIC form factors, PCB layout verification is required to confirm mechanical compatibility with existing footprints designed for 3.90mm width devices.

All recommended substitutes maintain ROHS3 compliance and are currently in active production status, ensuring long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can LP339MX/NOPB be used as a direct replacement for LP339MX?

A: Yes. LP339MX/NOPB is the active equivalent of the obsolete LP339MX, manufactured by Texas Instruments with identical electrical specifications, package dimensions (14-SOIC, 3.90mm width), and output configuration. No circuit modifications are required. The primary difference is product status (active vs. obsolete) and packaging format availability (Cut Tape and Digi-Reel).

Q: What is the key difference between AS339AMTR-E1 and AS339MTR-E1?

A: Both parts are open-collector quad comparators from Diodes Incorporated with identical electrical performance and 14-SOIC packaging. The primary difference is moisture sensitivity level: AS339AMTR-E1 has MSL 1 (unlimited shelf life), while AS339MTR-E1 has MSL 3 (168-hour floor life after moisture exposure). For applications requiring extended storage without moisture control, AS339AMTR-E1 is preferred.

Q: Can I use CMP04FSZ in place of LP339MX?

A: CMP04FSZ from Analog Devices Inc. is electrically compatible with LP339MX in terms of quad comparator function, 14-SOIC packaging (3.90mm width), and supply voltage range (with minimum 3.3V single supply vs. 2V for LP339MX). However, CMP04FSZ offers superior performance specifications (1mV input offset vs. 5mV). Circuit evaluation is required if the design operates below 3.3V single supply or relies on the lower input offset voltage of CMP04FSZ for signal conditioning.

Q: Are Rohm Semiconductor BA10339F-E2 and BA2901F-E2 compatible with the LP339MX footprint?

A: Both parts use 14-SOIC packaging but with 4.40mm width compared to LP339MX's 3.90mm width. While both are 14-SOIC form factors, the wider package may not fit existing PCB footprints designed for 3.90mm devices. PCB layout verification and potential footprint adjustment are necessary before substitution.

Q: What is the advantage of LM2901QS14-13 over LP339MX?

A: LM2901QS14-13 extends the operating temperature range to -40°C ~ 125°C (vs. 0°C ~ 70°C for LP339MX) and includes AEC-Q100 automotive qualification. It maintains compatible supply voltage (2V ~ 36V / ±1V ~ 18V) and 14-SOIC packaging. Input offset voltage is slightly higher (7mV @ 5V vs. 5mV), and quiescent current is lower (2.5mA vs. 100µA). This part is suitable for automotive and extended-temperature industrial applications.

Q: Which substitute part has the lowest input offset voltage?

A: CMP04FSZ from Analog Devices Inc. has the lowest input offset voltage at 1mV @ 5V, compared to 5mV for LP339MX. AS339AMTR-E1 from Diodes Incorporated offers 3mV @ 5V. Lower input offset voltage improves precision in analog signal comparison applications but requires verification that the design does not depend on the original 5mV specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, consistent with the original LP339MX specification.

Q: What does MSL 1 vs. MSL 3 mean for component storage?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control. MSL 3 requires floor life management: the component must be used within 168 hours of exposure to ambient moisture after the moisture barrier is opened. For high-volume production or extended inventory holding, MSL 1 parts (LP339MX/NOPB, AS339AMTR-E1, BA10339F-E2, BA2901F-E2, BA2901SF-E2, CMP04FSZ) are preferred.

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