LM339PT Equivalent & Substitute Parts

Part Overview

The LM339PT is a quad general-purpose comparator manufactured by Rohm Semiconductor in 14-TSSOP surface-mount packaging. This device integrates four independent voltage comparators with CMOS, MOS, Open-Collector, and TTL output compatibility, operating across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM339PT is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM339PT
Manufacturer	Rohm Semiconductor
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)	1mA
Operating Temperature	0°C ~ 70°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM339PT is determined by the following critical parameters:

Number of Elements: Must be 4 independent comparators
Output Type Compatibility: Must support at least one of CMOS, MOS, Open-Collector, or TTL output configurations
Supply Voltage Range: Must accommodate the required operating voltage (2V ~ 36V single supply or ±1V ~ ±18V dual supply)
Input Offset Voltage: Maximum 7mV @ 5V ensures comparable input precision
Input Bias Current: Maximum 0.25µA @ 5V for consistent input impedance
Output Current: Minimum 16mA @ 5V for adequate drive capability
Package Compatibility: 14-TSSOP or equivalent 14-pin surface-mount packages (14-SOIC acceptable with PCB layout adjustment)
Compliance: ROHS3 compliant and REACH unaffected status required

Substitutes are grouped into two categories: Direct Upgrades (active status, identical or superior electrical performance) and Similar Alternatives (active status, compatible electrical parameters with package or output type variations).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package
LM339PT	Rohm Semiconductor	Obsolete	CMOS, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	1mA	0°C ~ 70°C	14-TSSOP
LM2901AT14-13	Diodes Incorporated	Active	General Purpose	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-TSSOP
LM339PT	STMicroelectronics	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-TSSOP
AS339GTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-TSSOP
AS339AMTR-G1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC
AS339MTR-G1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA	2mA	-40°C ~ 85°C	14-SOIC
LMV339IDR	Texas Instruments	Active	Open-Collector	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	350µA	-40°C ~ 125°C	14-SOIC
LMV339M/NOPB	Texas Instruments	Active	CMOS, Open-Collector, TTL	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	14-SOIC
LMV339MT	National Semiconductor	Active	CMOS, Open-Collector, TTL	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	14-TSSOP
LMV339MTX	Texas Instruments	Last Time Buy	CMOS, Open-Collector, TTL	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	14-TSSOP
LMV339MTX/NOPB	National Semiconductor	Active	CMOS, Open-Collector, TTL	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	14-TSSOP

Engineering Selection Recommendations

Direct Upgrade (Identical Package, Active Status):

LM2901AT14-13 (Diodes Incorporated) provides the most direct substitution path. It maintains the 14-TSSOP package, supports the full 2V ~ 36V supply voltage range, and achieves superior input offset voltage performance (2mV vs. 7mV). Active product status ensures long-term availability and supply chain continuity.

LM339PT (STMicroelectronics) offers an alternative from an established manufacturer with active product status. It retains the 14-TSSOP package and identical part number designation, though supply voltage range is slightly reduced (2V ~ 32V vs. 2V ~ 36V). This variant is suitable for applications not requiring the full 36V upper limit.

Package-Compatible Alternatives (14-TSSOP, Active Status):

AS339GTR-E1 and LMV339MT/LMV339MTX provide 14-TSSOP packaging with active product status. These devices support the full 2V ~ 36V supply range and maintain output current specifications. Output type is limited to Open-Collector configurations, requiring verification of application compatibility.

Extended Temperature Range Options (14-SOIC Package):

AS339AMTR-G1 and AS339MTR-G1 (Diodes Incorporated) extend operating temperature to -40°C ~ 85°C in 14-SOIC packaging. These require PCB layout adjustment due to package change but maintain electrical compatibility and full supply voltage range support.

LMV339IDR and LMV339M/NOPB (Texas Instruments) offer extended temperature operation (-40°C ~ 125°C) with enhanced output current capability (84mA vs. 16mA). Supply voltage is restricted to 2.7V ~ 5.5V, limiting applicability to low-voltage designs.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original LM339PT specification.

Frequently Asked Questions (FAQ)

Q: Can LM2901AT14-13 directly replace LM339PT without PCB modifications?

A: Yes. LM2901AT14-13 maintains identical 14-TSSOP packaging and pinout compatibility. Electrical parameters are equivalent or superior, supporting the full 2V ~ 36V supply voltage range. No PCB layout changes are required.

Q: What is the key difference between LM339PT (Rohm) and LM339PT (STMicroelectronics)?

A: Both use identical part numbering and 14-TSSOP packaging. The STMicroelectronics variant has active product status versus obsolete status for Rohm. Supply voltage range differs slightly (2V ~ 32V vs. 2V ~ 36V). For applications requiring voltages above 32V, the Rohm specification should be verified against actual design requirements.

Q: Why do LMV339 variants have higher output current (84mA vs. 16mA)?

A: LMV339 series devices are optimized for low-voltage operation (2.7V ~ 5.5V) and feature enhanced output drive capability. This increased current is a design characteristic of the LMV339 family and does not affect substitution validity for standard comparator applications. Verify output current requirements in your specific circuit design.

Q: Can I use AS339AMTR-G1 (14-SOIC) instead of LM339PT (14-TSSOP)?

A: Yes, with PCB layout modification. AS339AMTR-G1 maintains electrical compatibility and full supply voltage range support. The 14-SOIC package has different pin spacing (0.154" vs. 0.173" width) and requires footprint redesign. Pinout compatibility must be verified against your PCB layout tool.

Q: What is the significance of "Last Time Buy" status for LMV339MTX?

A: Last Time Buy status indicates the manufacturer will discontinue production after a specified date. While currently available, this part should not be selected for new long-term production designs. LMV339MTX/NOPB (National Semiconductor, Active status) or LMV339MT (National Semiconductor, Active status) are preferred alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original LM339PT specification and compliance with environmental directives.

Q: Which substitute offers the widest operating temperature range?

A: LMV339IDR and LMV339M/NOPB (Texas Instruments) support -40°C ~ 125°C operation. However, these devices are restricted to 2.7V ~ 5.5V supply voltage. For applications requiring both wide temperature range and full 2V ~ 36V supply voltage support, LM2901AT14-13 or AS339GTR-E1 are appropriate selections.

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