LM339AM Equivalent & Substitute Parts

Part Overview

The LM339AM is a general-purpose comparator IC manufactured by onsemi, featuring four independent comparators in a 14-SOP package. The device supports dual supply operation (±1V to ±18V) and single supply operation (2V to 36V), with DTL, MOS, Open-Collector, and TTL output types. The LM339AM is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Substitute parts maintain functional compatibility while offering active product status and improved availability.

Key Parameters

Parameter	LM339AM
Number of Elements	4
Output Type	DTL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	2mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	18mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°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

Substitution eligibility for the LM339AM is determined by the following critical parameters:

Number of Elements: Must be 4 comparators
Package Type: 14-SOIC or 14-SOP form factor with 0.154" to 0.173" width tolerance
Output Type: Open-Collector output capability (primary requirement for LM339AM compatibility)
Supply Voltage Range: Minimum support for 2V ~ 36V single supply or ±1V ~ 18V dual supply
Input Offset Voltage: Maximum 7mV @ 5V or 30V reference
Input Bias Current: Maximum 0.25µA @ 5V
Output Current: Minimum 16mA typical
Quiescent Current: Maximum 2.5mA
Surface Mount Compatibility: All substitutes must be surface-mount variants

Substitute parts are grouped by manufacturer and product status. Active parts with equivalent or superior electrical specifications and identical package footprints are considered direct substitutes. Parts with extended temperature ranges or improved specifications provide enhanced performance margins for legacy design replacement.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage (Single/Dual)	Input Offset (Max)	Output Current (Typ)	Operating Temp	Package
LM339AM	onsemi	Obsolete	DTL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	18mA @ 5V	0°C ~ 70°C	14-SOIC
LM339DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	16mA @ 5V	0°C ~ 70°C	14-SOIC
AS339AMTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	16mA @ 5V	-40°C ~ 85°C	14-SOIC
AS339MTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA @ 5V	-40°C ~ 85°C	14-SOIC
AS339MTR-G1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA	-40°C ~ 85°C	14-SOIC
BA2901SF-E2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	-40°C ~ 105°C	14-SOIC
LM139AD	Texas Instruments	Last Time Buy	Open-Collector, Open-Drain	2V ~ 30V, ±1V ~ 15V	2mV @ 30V	20mA	-55°C ~ 125°C	14-SOIC
LM139ADT	STMicroelectronics	Active	Not specified	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	16mA @ 5V	-55°C ~ 125°C	14-SOIC
LM139DT	STMicroelectronics	Active	Not specified	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	16mA @ 5V	-55°C ~ 125°C	14-SOIC
LM239ADT	STMicroelectronics	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	16mA @ 5V	-40°C ~ 105°C	14-SOIC
LM239DT	STMicroelectronics	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	16mA @ 5V	-40°C ~ 105°C	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

The AS339AMTR-E1 and AS339MTR-E1 from Diodes Incorporated provide the closest electrical match to the LM339AM. Both maintain the full 2V ~ 36V single supply and ±1V ~ 18V dual supply voltage range, identical input bias current specifications, and Open-Collector output configuration. These parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The extended operating temperature range (-40°C to 85°C) exceeds the original LM339AM specification, providing improved thermal margin for legacy applications.

Secondary Substitutes (Acceptable with Verification)

The LM339DR2G from onsemi is an active product maintaining the same manufacturer lineage as the original part. The minimum supply voltage increases to 3V for single supply operation, which may require circuit evaluation for applications operating below this threshold. The LM239ADT and LM239DT from STMicroelectronics offer extended temperature operation (-40°C to 105°C) and active product status with ROHS3 compliance. These parts support the full voltage range and maintain equivalent output current specifications.

Extended Temperature Alternatives

The BA2901SF-E2 from Rohm Semiconductor and LM139 variants from Texas Instruments and STMicroelectronics provide superior temperature performance (-40°C to 105°C or -55°C to 125°C). These options are suitable for applications requiring extended thermal operating ranges. The LM139AD from Texas Instruments carries Last Time Buy status and should be evaluated only for applications where extended temperature operation is critical.

Compliance Considerations

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original LM339AM certification requirements. Moisture sensitivity levels range from MSL 1 (unlimited) to MSL 3 (168 hours), with MSL 1 parts preferred for standard manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can the LM339DR2G replace the LM339AM in all applications?

A: The LM339DR2G is functionally compatible for most applications. The primary difference is the minimum single supply voltage increases from 2V to 3V. Applications operating at 2V to 3V require circuit evaluation. The input offset voltage increases from 2mV to 5mV, which may affect precision comparator circuits with tight hysteresis margins.

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

A: Both parts are functionally equivalent with identical electrical specifications and package footprints. The primary difference is packaging format: AS339AMTR-E1 is supplied in Tape & Reel (TR), while AS339MTR-E1 is supplied in Cut Tape (CT) & Digi-Reel. The AS339MTR-E1 has MSL 3 (168 hours) versus MSL 1 (unlimited) for the AS339AMTR-E1, affecting moisture handling requirements during storage and assembly.

Q: Are the LM139 variants pin-compatible with the LM339AM?

A: Yes, all LM139 variants maintain the 14-SOIC package footprint and pin configuration compatible with the LM339AM. The LM139 series offers extended temperature operation and improved input bias current specifications (0.1µA maximum versus 0.25µA for the LM339AM), making them suitable for precision applications.

Q: Which substitute part offers the best availability?

A: The LM339DR2G from onsemi has the highest inventory (205,200 pieces), followed by LM239DT from STMicroelectronics (47,600 pieces) and AS339MTR-E1 from Diodes Incorporated (44,546 pieces). Availability should be confirmed with your component supplier for current production requirements.

Q: Can I use the BA2901SF-E2 in a design originally specified for the LM339AM?

A: Yes, the BA2901SF-E2 is electrically compatible with identical supply voltage range and output current specifications. The package width increases from 3.90mm to 4.40mm, requiring PCB layout verification to confirm mechanical clearance. The extended operating temperature range (-40°C to 105°C) provides improved thermal performance.

Q: What is the impact of increased input offset voltage in substitute parts?

A: The LM339AM specifies 2mV maximum input offset at 5V. Substitute parts range from 3mV to 7mV. For applications with tight comparator thresholds or precision measurement circuits, the increased offset voltage may require circuit recalibration or threshold adjustment. Applications with wide hysteresis margins (>10mV) are generally unaffected.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original LM339AM environmental certifications. This ensures compatibility with current manufacturing and environmental regulations.

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