LM339AMX Equivalent & Substitute Parts

Part Overview

The LM339AMX is a general-purpose comparator IC manufactured by onsemi, featuring four independent comparators in a 14-SOP surface-mount package. This device supports DTL, MOS, Open-Collector, and TTL output configurations with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The LM339AMX is classified as obsolete; therefore, identifying functionally equivalent active alternatives is essential for new designs and production continuity.

Key Parameters

Parameter	LM339AMX
Manufacturer	onsemi
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 of the LM339AMX is determined by the following critical parameters:

Number of Elements: Must be 4 independent comparators
Output Type: Must support Open-Collector configuration (compatible with DTL, MOS, TTL outputs)
Supply Voltage Range: Must accommodate 2V ~ 36V single supply or ±1V ~ ±18V dual supply
Input Offset Voltage: Maximum 2mV to 7mV @ 5V (within acceptable tolerance for general-purpose applications)
Input Bias Current: Maximum 0.25µA to 0.5µA @ 5V
Output Current: Minimum 16mA @ 5V (LM339AMX specifies 18mA)
Package Compatibility: 14-SOIC or 14-TSSOP surface-mount packages with 0.154" to 0.173" width
Operating Temperature: Minimum 0°C to 70°C (industrial grade)
RoHS Compliance: ROHS3 Compliant
Product Status: Active preferred for long-term availability

Substitute parts are grouped into three categories: direct onsemi LM339 series alternatives, onsemi LM2901/LM239 series alternatives with extended temperature ranges, and cross-manufacturer equivalents from Texas Instruments and Diodes Incorporated.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage (Single/Dual)	Input Offset (Max) @ 5V	Input Bias (Max) @ 5V	Output Current (Typ) @ 5V	Operating Temp	Package	Inventory
LM339AMX	onsemi	Obsolete	DTL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	2mV	0.25µA	18mA	0°C ~ 70°C	14-SOP	63585 Pcs
LM339DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	5mV	0.25µA	16mA	0°C ~ 70°C	14-SOIC	205200 Pcs
LM339DTBR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	5mV	0.25µA	16mA	0°C ~ 70°C	14-TSSOP	2510 Pcs
LM239DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	5mV	0.25µA	16mA	-25°C ~ 85°C	14-SOIC	105400 Pcs
LM2901DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	7mV	0.25µA	16mA	-40°C ~ 105°C	14-SOIC	127336 Pcs
LM2901VDR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	7mV	0.25µA	16mA	-40°C ~ 125°C	14-SOIC	3100 Pcs
MC3302DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 30V, ±1.5V ~ 15V	20mV	0.5µA	16mA	-40°C ~ 85°C	14-SOIC	3313 Pcs
NCV2901DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V ~ 36V, ±1.5V ~ 18V	7mV	0.25µA	16mA	-40°C ~ 125°C	14-SOIC	25200 Pcs
LM339ADR	Texas Instruments	Active	Open-Collector	2V ~ 30V, ±1V ~ 15V	3mV @ 30V	0.25µA	20mA	0°C ~ 70°C	14-SOIC	105100 Pcs
AS339AMTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	0.25µA	16mA @ 5V	-40°C ~ 85°C	14-SOIC	50100 Pcs
AS339MTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.25µA	16mA @ 5V	-40°C ~ 85°C	14-SOIC	44546 Pcs

Engineering Selection Recommendations

Primary Recommendation: LM339DR2G (onsemi)

LM339DR2G is the direct active equivalent within the onsemi LM339 product line. It maintains identical operating temperature range (0°C ~ 70°C) and package format (14-SOIC) as the LM339AMX. Input offset voltage increases from 2mV to 5mV, which remains acceptable for general-purpose comparator applications. Output current decreases from 18mA to 16mA, sufficient for standard logic-level interfacing. Supply voltage range expands to 3V minimum, compatible with the LM339AMX's 2V lower limit for most industrial applications. ROHS3 compliance and MSL-1 rating ensure manufacturing compatibility. Inventory availability (205200 Pcs) supports production requirements.

Secondary Recommendation: LM339ADR (Texas Instruments)

LM339ADR provides cross-manufacturer equivalence with active product status. Supply voltage range (2V ~ 30V single, ±1V ~ 15V dual) closely matches the LM339AMX. Input offset voltage (3mV @ 30V) and output current (20mA) exceed LM339AMX specifications. Operating temperature range (0°C ~ 70°C) is identical. Package format (14-SOIC) is compatible. ROHS3 compliance and MSL-1 rating are maintained. Inventory (105100 Pcs) supports production continuity.

Extended Temperature Alternative: LM2901DR2G (onsemi)

LM2901DR2G extends operating temperature to -40°C ~ 105°C, suitable for industrial and automotive environments. Supply voltage range (3V ~ 36V, ±1.5V ~ 18V) accommodates the LM339AMX specification. Input offset voltage (7mV) and input bias current (0.25µA) remain within acceptable tolerances. Output current (16mA) is adequate for standard applications. ROHS3 compliance and MSL-1 rating are maintained. Inventory (127336 Pcs) is substantial.

Automotive Grade Alternative: NCV2901DR2G (onsemi)

NCV2901DR2G is AEC-Q100 qualified for automotive applications, extending operating temperature to -40°C ~ 125°C. Electrical parameters match LM2901DR2G. ROHS3 compliance and MSL-1 rating are maintained. Inventory (25200 Pcs) supports automotive production volumes.

Compact Package Alternative: LM339DTBR2G (onsemi)

LM339DTBR2G provides the same electrical performance as LM339DR2G in a 14-TSSOP package (0.173" width) for space-constrained applications. Operating temperature (0°C ~ 70°C) matches the LM339AMX. Inventory (2510 Pcs) is limited.

Limited Voltage Range Alternative: MC3302DR2G (onsemi)

MC3302DR2G is suitable only for applications not requiring the full 36V supply voltage range. Maximum supply voltage is 30V (single) or ±15V (dual). Input offset voltage (20mV) and input bias current (0.5µA) exceed LM339AMX specifications. Extended operating temperature (-40°C ~ 85°C) is available. Inventory (3313 Pcs) is limited.

Frequently Asked Questions (FAQ)

Q: Can LM339DR2G directly replace LM339AMX without circuit modification?

A: LM339DR2G is a direct pin-compatible replacement in the 14-SOIC package. The primary difference is minimum supply voltage (3V vs. 2V). If your circuit operates above 3V, no modification is required. For applications requiring 2V operation, use LM339ADR (Texas Instruments) or AS339AMTR-E1 (Diodes Incorporated), which maintain the 2V minimum.

Q: What is the difference between LM339DR2G and LM2901DR2G?

A: Both are four-comparator ICs in 14-SOIC packages with identical electrical performance at 5V operation. LM2901DR2G extends operating temperature to -40°C ~ 105°C, compared to LM339DR2G's 0°C ~ 70°C. Select LM2901DR2G for industrial or temperature-critical applications; select LM339DR2G for standard commercial temperature ranges.

Q: Is the 14-TSSOP package (LM339DTBR2G) compatible with 14-SOIC PCB layouts?

A: No. 14-TSSOP (0.173" width) and 14-SOIC (0.154" width) have different footprints. PCB redesign is required for LM339DTBR2G. Use LM339DR2G or LM339DTBR2G only if space constraints justify layout modification.

Q: Why does MC3302DR2G have higher input offset voltage (20mV)?

A: MC3302DR2G is a legacy comparator design with relaxed input offset specifications. It is suitable only for applications tolerating ±20mV offset. For precision applications, use LM339DR2G (5mV), LM2901DR2G (7mV), or LM339ADR (3mV).

Q: Can I use LM239DR2G as a substitute?

A: Yes. LM239DR2G is functionally equivalent to LM339DR2G with extended operating temperature (-25°C ~ 85°C). Both are pin-compatible 14-SOIC packages. LM239DR2G is suitable for commercial and industrial temperature ranges.

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

A: Both are Diodes Incorporated four-comparator ICs in 14-SOIC packages with identical electrical performance. AS339AMTR-E1 has MSL-1 (Unlimited) moisture sensitivity; AS339MTR-E1 has MSL-3 (168 Hours). Select AS339AMTR-E1 for standard manufacturing; select AS339MTR-E1 only if MSL-3 handling is acceptable.

Q: Is NCV2901DR2G suitable for non-automotive applications?

A: Yes. NCV2901DR2G is AEC-Q100 qualified but functionally identical to LM2901DR2G. It is suitable for any application requiring -40°C ~ 125°C operation. Use NCV2901DR2G for automotive designs; use LM2901DR2G for general industrial applications to optimize cost.

Q: What supply voltage range should I verify before substitution?

A: Verify your circuit's minimum and maximum supply voltages. LM339AMX supports 2V minimum; LM339DR2G and LM239DR2G support 3V minimum. If your circuit operates below 3V, use LM339ADR, AS339AMTR-E1, or AS339MTR-E1 (all support 2V minimum).

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