LM339AMX Equivalent & Substitute Parts

Part Overview

The LM339AMX 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 LM339AMX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across electrical specifications, package dimensions, and output characteristics to ensure direct replacement capability.

Key Parameters

Parameter	LM339AMX	Unit
Number of Elements	4	Comparators
Output Type	Open-Collector	—
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	V
Voltage - Input Offset (Max)	2mV @ 5V	mV
Current - Input Bias (Max)	0.25µA @ 5V	µA
Current - Output (Typ)	18mA @ 5V	mA
Current - Quiescent (Max)	2.5mA	mA
Operating Temperature	0°C ~ 70°C	°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

Substitute parts for the LM339AMX are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Number of Elements: Must be 4 comparators
Output Type: Must be Open-Collector
Supply Voltage Range: Must support 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Package Type: Must be 14-SOIC or equivalent 14-pin surface-mount package
Input Offset Voltage: Maximum 2mV to 7mV @ 5V
Input Bias Current: Maximum 0.1µA to 0.25µA @ 5V
Output Current: Typical 16mA to 18mA @ 5V
Quiescent Current: Maximum 2mA to 2.5mA

Parts are classified into three categories:

Direct Substitutes maintain identical electrical specifications and packaging, enabling pin-for-pin replacement without circuit modification.

Upgrade Substitutes offer extended operating temperature ranges or improved performance characteristics while maintaining core electrical compatibility.

Manufacturer-Recommended Substitutes are actively produced alternatives from different manufacturers that meet or exceed the original specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	MSL
LM339AMX	Texas Instruments	Obsolete	Open-Collector	2V~36V, ±1V~18V	2mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	1
LM339AMX/NOPB	Texas Instruments	Active	Open-Collector	2V~36V, ±1V~18V	2mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	1
LM2901AS14-13	Diodes Incorporated	Active	—	2V~36V, ±1V~18V	2mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	3
AS339AMTR-E1	Diodes Incorporated	Active	Open-Collector	2V~36V, ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	1
AS339MTR-E1	Diodes Incorporated	Active	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	3
AS339MTR-G1	Diodes Incorporated	Active	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA	2mA	-40°C ~ 85°C	14-SOIC	3
BA10339F-E2	Rohm Semiconductor	Active	Open-Collector	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC	1
BA2901SF-E2	Rohm Semiconductor	Active	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	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	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	1

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active): LM339AMX/NOPB from Texas Instruments is the primary direct substitute. It maintains identical supply voltage range, input offset specification, and operating temperature range while offering active product status and improved availability.

For Extended Temperature Range Applications: LM2901AS14-13 (Diodes Incorporated) extends the operating temperature to -40°C ~ 125°C, suitable for industrial and automotive environments. LM139ADT and LM139DT (STMicroelectronics) provide -55°C ~ 125°C operation for extreme temperature applications.

For Highest Availability and Inventory: BA10339F-E2 (Rohm Semiconductor) offers the largest inventory stock (166,201 pcs) with active product status and MSL 1 rating, ensuring long-term supply continuity.

For Extended Operating Temperature with Dual Supply Compatibility: BA2901SF-E2 (Rohm Semiconductor) supports -40°C ~ 105°C operation and maintains full 2V ~ 36V single-supply and ±1V ~ ±18V dual-supply compatibility.

For Lowest Input Bias Current: LM139ADT and LM239ADT (STMicroelectronics) specify 0.1µA maximum input bias current, compared to 0.25µA for the original part, reducing input loading effects in high-impedance circuits.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can LM339AMX/NOPB be used as a direct replacement for LM339AMX? A: Yes. LM339AMX/NOPB is the active production equivalent with identical electrical specifications, package dimensions, and pin configuration. The /NOPB suffix indicates lead-free, RoHS-compliant manufacturing.

Q: What is the key difference between LM339AMX and AS339AMTR-E1? A: Both are open-collector quad comparators in 14-SOIC packaging with identical supply voltage ranges. AS339AMTR-E1 extends the operating temperature to -40°C ~ 85°C (versus 0°C ~ 70°C) and has slightly higher input offset voltage (3mV versus 2mV @ 5V). AS339AMTR-E1 is manufactured by Diodes Incorporated and offers better long-term availability.

Q: Are LM139ADT and LM239ADT compatible with LM339AMX circuits? A: Both are quad comparators in 14-SOIC packaging with compatible supply voltage ranges. However, LM139ADT and LM239ADT specify a narrower dual-supply range (±1V ~ ±16V versus ±1V ~ ±18V) and single-supply maximum of 32V versus 36V. Verify your circuit's supply voltage requirements before substitution. LM139ADT and LM239ADT also specify lower input bias current (0.1µA), which may improve performance in high-impedance applications.

Q: What does MSL 1 versus MSL 3 mean for component handling? A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control. MSL 3 requires moisture control and has a 168-hour floor life after opening the moisture barrier bag. For production environments with controlled storage, MSL 3 parts present no practical limitation. For long-term inventory or uncontrolled storage, MSL 1 parts are preferred.

Q: Can I substitute BA10339F-E2 if my circuit operates below 3V? A: No. BA10339F-E2 specifies a minimum supply voltage of 3V (versus 2V for LM339AMX). For circuits operating at 2V, use LM339AMX/NOPB, AS339AMTR-E1, AS339MTR-E1, AS339MTR-G1, BA2901SF-E2, or the STMicroelectronics LM139/LM239 series.

Q: Which substitute offers the best performance for automotive applications? A: LM2901AS14-13 (Diodes Incorporated) provides -40°C ~ 125°C operation suitable for automotive temperature extremes. Alternatively, LM139ADT and LM139DT (STMicroelectronics) extend to -55°C ~ 125°C for harsh automotive environments. All maintain ROHS3 compliance and are available in high-volume quantities.

Q: Is the output current specification critical for substitution? A: Output current differences (16mA to 18mA @ 5V) are minor and typically not circuit-limiting for open-collector comparators. However, verify your pull-up resistor design accommodates the specified output current to ensure proper switching performance.

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