LM339DT Equivalent & Substitute Parts

Part Overview

The LM339DT is a general-purpose quad comparator IC manufactured by Rohm Semiconductor in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and features four independent comparator elements with open-collector, TTL, CMOS, and MOS output compatibility. The LM339DT is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part is unavailable, when supply chain constraints require alternative sourcing, or when design requirements demand enhanced operating temperature ranges or specific output characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM339DT
Manufacturer	Rohm Semiconductor
Category	Linear Comparator
Number of Elements	4
Output Type	CMOS, MOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	2V ~ 36V / ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2mA
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM339DT is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Number of elements: 4 comparators
Package type: 14-SOIC (0.154", 3.90mm Width) or equivalent 14-pin SOIC variant
Output type compatibility: Must support open-collector or TTL output modes
Supply voltage range: Minimum 2V to 36V single supply capability
Input offset voltage: Maximum 7mV @ 5V or better
Input bias current: Maximum 0.25µA @ 5V or better
Output current: Minimum 16mA @ 5V capability
Quiescent current: Maximum 2.5mA acceptable
RoHS3 compliance required

Substitution Categories:

Direct Substitutes (Functionally Equivalent): Parts meeting all mandatory criteria with identical or superior electrical performance within the specified operating temperature range.

Upgrade Substitutes (Enhanced Performance): Parts exceeding the LM339DT specifications, particularly in operating temperature range (-40°C to 85°C or wider), while maintaining full electrical compatibility.

Similar Substitutes (Conditional Compatibility): Parts with comparable core functionality but operating within narrower supply voltage ranges (2.7V to 5.5V) or different temperature ratings, suitable only for applications within their specified operating windows.

Parameter Comparison

Parameter	LM339DT (Main)	LM2901HYDT	AS339AMTR-E1	AS339MTR-E1	AS339MTR-G1	AS339AMTR-G1	LMV339ID	LMV339M/NOPB	LMV339MT/NOPB	LMV339MX/NOPB	LM139ADG4
Manufacturer	Rohm	STMicroelectronics	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments
Number of Elements	4	4	4	4	4	4	4	4	4	4	4
Output Type	CMOS, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector	Open-Collector	Open-Collector	Open-Collector	Open-Collector	CMOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	Open-Collector, Open-Drain
Supply Voltage (Single/Dual)	2V ~ 36V / ±1V ~ 18V	2V ~ 36V / ±1V ~ 18V	2V ~ 36V / ±1V ~ 18V	2V ~ 36V / ±1V ~ 18V	2V ~ 36V / ±1V ~ 18V	2V ~ 36V / ±1V ~ 18V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2V ~ 30V / ±1V ~ 15V
Input Offset Voltage (Max) @ 5V	7mV	—	3mV	5mV	5mV	3mV	7mV	7mV	7mV	7mV	2mV @ 30V
Input Bias Current (Max) @ 5V	0.25µA	—	0.25µA	0.25µA	0.25µA	0.25µA	0.25µA	0.25µA	0.25µA	0.25µA	0.1µA @ 5V
Output Current (Typ) @ 5V	16mA	—	16mA	16mA	16mA	16mA	84mA	84mA	84mA	84mA	20mA
Quiescent Current (Max)	2mA	2.5mA	2mA	2mA	2mA	2mA	350µA	300µA	300µA	300µA	2mA
Operating Temperature	0°C ~ 70°C	—	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C
Package / Case	14-SOIC	14-SO	14-SOIC	14-SOIC	14-SOIC	14-SO	14-SOIC	14-SOIC	14-TSSOP	14-SOIC	14-SOIC
Product Status	Active	Active	Active	Active	Active	Active	Last Time Buy	Active	Active	Active	Obsolete
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitute (Recommended Primary Alternative):

LM2901HYDT (STMicroelectronics) is the direct functional equivalent, maintaining identical supply voltage range (2V to 36V / ±1V to ±18V), quiescent current specification (2.5mA maximum), and 14-SO package compatibility. This part is actively produced and RoHS3 compliant. The automotive-grade qualification (AEC-Q100) provides additional reliability assurance for demanding applications. MSL 3 rating requires standard moisture control during storage and assembly.

Upgrade Substitutes (Enhanced Temperature Range):

AS339AMTR-E1, AS339MTR-E1, AS339MTR-G1, and AS339AMTR-G1 (Diodes Incorporated) all extend the operating temperature range to -40°C to 85°C, exceeding the LM339DT's 0°C to 70°C specification. These parts maintain full electrical compatibility with identical supply voltage ranges and output current specifications. AS339AMTR-E1 offers MSL 1 (unlimited) rating, while the MTR variants carry MSL 3. All are actively produced and RoHS3 compliant. Selection between these variants depends on packaging preference (Tape & Reel vs. Cut Tape) and moisture sensitivity requirements.

Similar Substitutes (Restricted Supply Voltage Range):

LMV339ID, LMV339M/NOPB, LMV339MT/NOPB, and LMV339MX/NOPB (Texas Instruments / National Semiconductor) operate within a narrower supply voltage range (2.7V to 5.5V) compared to the LM339DT's 2V to 36V capability. These parts are suitable only for applications operating within this restricted voltage window. LMV339ID is classified as Last Time Buy, indicating discontinued production. LMV339M/NOPB and LMV339MX/NOPB remain active. All feature significantly lower quiescent current (300µA to 350µA) and higher output current capability (84mA), making them advantageous for low-power and high-drive applications within their voltage specification. LMV339MT/NOPB uses a 14-TSSOP package instead of 14-SOIC, requiring PCB layout modification.

Conditional Substitute (Obsolete Status):

LM139ADG4 (Texas Instruments) is classified as obsolete and should be avoided for new designs. While it maintains the 14-SOIC package and four-element configuration, its discontinuation status creates long-term supply risk. This part is listed only for reference in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q: Can I use LMV339ID as a direct replacement for LM339DT?

A: LMV339ID is not a direct replacement. It operates within a narrower supply voltage range (2.7V to 5.5V) versus the LM339DT's 2V to 36V capability. Use LMV339ID only if your application operates exclusively within the 2.7V to 5.5V window. Additionally, LMV339ID is classified as Last Time Buy, indicating production discontinuation.

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

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications and -40°C to 85°C operating temperature range. The primary difference is packaging: AS339AMTR-E1 is supplied in Tape & Reel format, while AS339MTR-E1 uses Cut Tape & Digi-Reel format. AS339AMTR-E1 carries MSL 1 (unlimited moisture sensitivity), while AS339MTR-E1 carries MSL 3 (168 hours). Select based on your assembly process requirements and moisture control capabilities.

Q: Is LM2901HYDT suitable for automotive applications?

A: Yes. LM2901HYDT carries AEC-Q100 automotive qualification, making it suitable for automotive-grade applications. It maintains the same electrical specifications as the LM339DT while offering automotive-level reliability assurance.

Q: Why do some substitutes have lower quiescent current than the LM339DT?

A: LMV339 series parts (LMV339ID, LMV339M/NOPB, LMV339MT/NOPB, LMV339MX/NOPB) feature significantly lower quiescent current (300µA to 350µA) compared to the LM339DT (2mA). This is a design characteristic of the LMV339 architecture, optimized for low-power applications. However, these parts operate within a restricted supply voltage range (2.7V to 5.5V), limiting their applicability to wide-voltage designs.

Q: Can I substitute LMV339MT/NOPB for LM339DT without PCB modification?

A: No. LMV339MT/NOPB uses a 14-TSSOP package (0.173", 4.40mm width) instead of the LM339DT's 14-SOIC package (0.154", 3.90mm width). PCB footprint modification is required. Additionally, the narrower supply voltage range (2.7V to 5.5V) restricts its use to applications within this window.

Q: What does MSL 1 versus MSL 3 mean for my assembly process?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before requiring baking. MSL 1 (unlimited) parts have no time restriction and require standard handling. MSL 3 (168 hours) parts must be baked if exposed to ambient conditions for more than 168 hours before soldering. Select MSL 1 parts if your assembly process involves extended storage or if you prefer simplified moisture management.

Q: Is LM139ADG4 still available for new designs?

A: No. LM139ADG4 is classified as obsolete and should not be used in new designs. Use AS339AMTR-E1, AS339MTR-E1, or LM2901HYDT as active alternatives instead.

Q: Which substitute offers the widest operating temperature range?

A: LM139ADG4 (-55°C to 125°C) and LMV339ID (-40°C to 125°C) offer the widest temperature ranges. However, LM139ADG4 is obsolete. LMV339ID remains active but is classified as Last Time Buy. For active production parts with extended temperature range, AS339AMTR-E1, AS339MTR-E1, AS339MTR-G1, and AS339AMTR-G1 all operate from -40°C to 85°C, exceeding the LM339DT's 0°C to 70°C specification.

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