LM339AM Equivalent & Substitute Parts

Part Overview

The LM339AM 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 LM339AM is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Substitute parts must maintain functional compatibility through matching electrical characteristics, package dimensions, and output configuration while meeting current product availability and compliance requirements.

Key Parameters

Parameter	LM339AM	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 LM339AM are grouped based on strict electrical and mechanical compatibility criteria. All substitutes must meet the following requirements:

Critical Matching Parameters:

Number of Elements: 4 comparators
Output Type: Open-Collector (required for direct functional replacement)
Package / Case: 14-SOIC with 0.154" (3.90mm) width
Mounting Type: Surface Mount
Voltage - Supply, Single/Dual (±): 2V ~ 36V, ±1V ~ 18V (minimum range requirement)
Current - Input Bias (Max): 0.25µA @ 5V or lower
Current - Output (Typ): 16mA @ 5V or higher
Current - Quiescent (Max): 2.5mA or lower
RoHS Status: ROHS3 Compliant

Substitution Categories:

Direct Equivalent (Pin-Compatible, Identical Specifications): LM339AM/NOPB maintains identical electrical performance and packaging.

Manufacturer Recommended Substitutes (Enhanced Performance): AS339AMTR-E1, AS339MTR-E1, and AS339MTR-G1 from Diodes Incorporated provide extended operating temperature ranges (-40°C to 85°C) while maintaining open-collector output and core electrical parameters. These parts are actively produced and widely available.

Alternative Substitutes (Functional Compatibility with Parameter Variations): LM2901AS14-13, BA2901SF-E2, LM139ADT, LM139DT, LM239ADT, and LM239DR2G provide functional quad-comparator operation with open-collector or compatible output types. These parts maintain the 14-SOIC package footprint and core supply voltage range but may have minor variations in input offset voltage, input bias current, or operating temperature specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Supply (V)	Input Offset Max (mV)	Input Bias Max (µA)	Output Current Typ (mA)	Quiescent Current Max (mA)	Operating Temp (°C)	Package	MSL
LM339AM	Texas Instruments	Obsolete	Open-Collector	2~36, ±1~18	2 @ 5V	0.25 @ 5V	18 @ 5V	2.5	0~70	14-SOIC	1
LM339AM/NOPB	National Semiconductor	Active	Open-Collector	2~36, ±1~18	2 @ 30V	0.25 @ 5V	16 @ 5V	2.5	0~70	14-SOIC	1
AS339AMTR-E1	Diodes Incorporated	Active	Open-Collector	2~36, ±1~18	3 @ 5V	0.25 @ 5V	16 @ 5V	2	-40~85	14-SOIC	1
AS339MTR-E1	Diodes Incorporated	Active	Open-Collector	2~36, ±1~18	5 @ 5V	0.25 @ 5V	16 @ 5V	2	-40~85	14-SOIC	3
AS339MTR-G1	Diodes Incorporated	Active	Open-Collector	2~36, ±1~18	5 @ 5V	0.25 @ 5V	16	2	-40~85	14-SOIC	3
LM2901AS14-13	Diodes Incorporated	Active	—	2~36, ±1~18	2 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40~125	14-SOIC	3
BA2901SF-E2	Rohm Semiconductor	Active	Open-Collector	2~36, ±1~18	7 @ 5V	0.25 @ 5V	16 @ 5V	2	-40~105	14-SOIC	1
LM139ADT	STMicroelectronics	Active	—	2~32, ±1~16	2 @ 30V	0.1 @ 5V	16 @ 5V	2	-55~125	14-SOIC	1
LM139DT	STMicroelectronics	Active	—	2~32, ±1~16	5 @ 30V	0.25 @ 5V	16 @ 5V	2	-55~125	14-SOIC	1
LM239ADT	STMicroelectronics	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2~32, ±1~16	2 @ 30V	0.1 @ 5V	16 @ 5V	2	-40~105	14-SOIC	1
LM239DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3~36, ±1.5~18	5 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-25~85	14-SOIC	1

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select LM339AM/NOPB when exact electrical performance matching is required. This part maintains the original LM339AM specifications while offering active product status and continuous availability.

For New Designs and Production (Recommended): Select AS339AMTR-E1 or AS339MTR-E1 from Diodes Incorporated. These parts are manufacturer-recommended substitutes with active product status, extended operating temperature range (-40°C to 85°C), and superior availability (50,100 and 44,546 units in stock respectively). Both maintain open-collector output configuration and core electrical parameters within acceptable engineering tolerances.

For Extended Temperature Applications: Select LM2901AS14-13 (Diodes Incorporated, -40°C to 125°C) or LM139ADT/LM139DT (STMicroelectronics, -55°C to 125°C) when operating temperature range exceeds the standard 0°C to 70°C specification. These parts maintain quad-comparator functionality and 14-SOIC packaging.

For High-Volume Production: Select LM239DR2G from onsemi (105,400 units in stock) for maximum supply chain security and cost optimization. This part provides quad-comparator functionality with open-collector output compatibility and ROHS3 compliance.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original LM339AM regulatory requirements. Moisture sensitivity levels vary from MSL 1 (unlimited) to MSL 3 (168 hours), which may impact storage and handling procedures depending on production environment.

Frequently Asked Questions (FAQ)

Q: Can LM339AM/NOPB be used as a direct drop-in replacement for LM339AM? A: Yes. LM339AM/NOPB maintains identical electrical specifications, package dimensions (14-SOIC), and open-collector output configuration. The primary difference is active product status versus obsolete status.

Q: What is the key difference between AS339AMTR-E1 and AS339MTR-E1? A: Both are Diodes Incorporated manufacturer-recommended substitutes with identical electrical performance. AS339AMTR-E1 has MSL 1 (unlimited moisture sensitivity), while AS339MTR-E1 has MSL 3 (168 hours). Select based on storage and handling requirements.

Q: Can LM2901AS14-13 replace LM339AM in all applications? A: LM2901AS14-13 provides quad-comparator functionality in 14-SOIC packaging with extended temperature range (-40°C to 125°C). However, output type specification is not provided in the datasheet parameters. Verify output configuration compatibility with your circuit design before substitution.

Q: Why do some substitutes show different supply voltage ranges (e.g., 2V~32V vs. 2V~36V)? A: Different manufacturers specify slightly different maximum supply voltage ratings. LM139 series parts specify 2V~32V (±1V~16V), which is narrower than the original LM339AM specification of 2V~36V (±1V~18V). Verify your circuit operates within the substitute part's specified range.

Q: Is the 14-SOIC package identical across all substitute parts? A: All substitute parts use 14-SOIC surface-mount packaging with 0.154" (3.90mm) width, ensuring PCB footprint compatibility. BA2901SF-E2 specifies 14-SOP with 0.173" (4.40mm) width, which may require PCB layout verification for tight spacing applications.

Q: What is the significance of input offset voltage differences (2mV vs. 5mV vs. 7mV)? A: Input offset voltage determines the accuracy of voltage comparison at the threshold point. Lower values (2mV) provide higher precision. For general-purpose applications, differences up to 7mV are typically acceptable. For precision measurement circuits, select parts with lower input offset voltage specifications.

Q: Can I use LM239DR2G if my circuit requires ±1V to ±18V dual supply operation? A: LM239DR2G specifies ±1.5V to ±18V dual supply range, which is slightly narrower than the original ±1V to ±18V specification. Verify your circuit does not require operation below ±1.5V before substitution.

Q: Which substitute offers the best long-term availability? A: LM239DR2G from onsemi has the highest inventory (105,400 units in stock) and active product status, providing superior supply chain security for high-volume production.

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