LP339D Equivalent & Substitute Parts

Part Overview

The LP339D is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (3V ~ 30V single supply, ±1.5V ~ 15V dual supply) and is designed for applications requiring precision voltage comparison with CMOS, MOS, and open-collector output configurations.

The LP339D carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This necessitates identification of equivalent and substitute parts to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	LP339D Specification
Manufacturer	Texas Instruments
Package / Case	14-SOIC (0.154", 3.90mm Width)
Number of Elements	4
Output Type	CMOS, MOS, Open-Collector
Voltage - Supply, Single/Dual (±)	3V ~ 30V, ±1.5V ~ 15V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.025µA @ 5V
Current - Output (Typ)	30mA @ 5V
Current - Quiescent (Max)	100µA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP339D is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Package type: 14-SOIC surface-mount configuration
Number of comparator elements: 4 independent units
Output type compatibility: CMOS, MOS, or Open-Collector
Supply voltage range: Minimum 3V ~ 30V single supply or equivalent dual supply
Input offset voltage: Maximum 5mV specification
Input bias current: Maximum 0.025µA specification
Output current capability: Minimum 30mA @ 5V
Quiescent current: Maximum 100µA
Operating temperature range: 0°C ~ 70°C minimum

Substitution Categories:

Direct Equivalents (Texas Instruments LP339 Series): Parts LP339M/NOPB, LP339MX/NOPB, and LP339DR maintain the same base product number and core functionality. LP339M/NOPB and LP339MX/NOPB offer extended supply voltage range (2V ~ 36V) with reduced output current (10mA), requiring design verification for applications demanding 30mA output. LP339DR matches the original LP339D electrical specifications exactly while maintaining active product status.

Cross-Manufacturer Equivalents: LM339DT and LM339ADT (STMicroelectronics) and LM339DR2G (onsemi) provide functionally equivalent 4-comparator configurations in 14-SOIC packaging with compatible electrical characteristics and active product status.

Extended-Range Alternatives: LM2901S14-13 (Diodes Incorporated) and LM2901AQT14-13 (Diodes Incorporated) expand the operating temperature range to -40°C ~ 125°C and offer automotive-grade qualification (AEC-Q100), though with different package variants (14-SO and 14-TSSOP respectively).

Alternative Manufacturers: BA10339F-E2 (Rohm Semiconductor) and BA2901SF-E2 (Rohm Semiconductor) provide open-collector output configurations in 14-SOP packaging with extended temperature ranges and high inventory availability.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
LP339D	Texas Instruments	14-SOIC	3V ~ 30V, ±1.5V ~ 15V	5mV @ 30V	0.025µA @ 5V	30mA @ 5V	100µA	0°C ~ 70°C	Last Time Buy
LP339M/NOPB	Texas Instruments	14-SOIC	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.025µA @ 5V	10mA @ 5V	100µA	0°C ~ 70°C	Active
LP339MX/NOPB	Texas Instruments	14-SOIC	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	0.025µA @ 5V	10mA @ 5V	100µA	0°C ~ 70°C	Active
LP339DR	Texas Instruments	14-SOIC	3V ~ 30V, ±1.5V ~ 15V	5mV @ 30V	0.025µA @ 5V	30mA @ 5V	100µA	0°C ~ 70°C	Active
LM339DT	STMicroelectronics	14-SOIC	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM339ADT	STMicroelectronics	14-SOIC	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM339DR2G	onsemi	14-SOIC	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM2901S14-13	Diodes Incorporated	14-SOIC	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2901AQT14-13	Diodes Incorporated	14-TSSOP	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
BA10339F-E2	Rohm Semiconductor	14-SOIC	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	Active
BA2901SF-E2	Rohm Semiconductor	14-SOIC	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active

Engineering Selection Recommendations

Recommended Primary Substitute: LP339DR

The LP339DR is the direct active-production equivalent of the LP339D, manufactured by Texas Instruments under the same base product number. This part maintains identical electrical specifications, including 30mA output current capability, 100µA quiescent current, and the original 3V ~ 30V supply voltage range. The LP339DR carries active product status with high inventory availability (5016 pcs), ensuring long-term supply continuity. ROHS3 compliance and MSL-1 moisture sensitivity rating match the original specification exactly.

Secondary Substitute: LM339DT (STMicroelectronics)

The LM339DT provides functional equivalence in 14-SOIC packaging with active product status and exceptional inventory depth (445,200 pcs). This part operates within the 0°C ~ 70°C temperature range matching the LP339D and maintains ROHS3 compliance. The LM339DT exhibits lower quiescent current (2.5mA vs. 100µA) and reduced output current (16mA vs. 30mA), requiring verification for applications demanding the full 30mA output specification. Input bias current increases to 0.25µA, which may affect precision applications requiring the original 0.025µA specification.

Alternative for Extended Temperature Range: LM2901AQT14-13 (Diodes Incorporated)

For applications requiring operation beyond the standard 0°C ~ 70°C range, the LM2901AQT14-13 extends operation to -40°C ~ 125°C and carries automotive-grade AEC-Q100 qualification. This part is packaged in 14-TSSOP (not 14-SOIC), requiring PCB layout modification. The device offers superior input offset voltage (2mV vs. 5mV) and maintains active product status with substantial inventory (19,280 pcs).

Cross-Manufacturer Option: BA10339F-E2 (Rohm Semiconductor)

The BA10339F-E2 provides open-collector output configuration in 14-SOP packaging with extended temperature range (-40°C ~ 85°C) and exceptional inventory availability (166,201 pcs). This part maintains 3V ~ 36V supply voltage compatibility and ROHS3 compliance. The 14-SOP package width (4.40mm) differs from the original 14-SOIC (3.90mm), requiring PCB footprint verification before implementation.

Not Recommended for Direct Substitution: LP339M/NOPB and LP339MX/NOPB

While these Texas Instruments parts share the LP339 base product number, the reduced output current specification (10mA vs. 30mA) makes them unsuitable for applications requiring the full 30mA output capability of the LP339D. These parts are appropriate only for designs where output current requirements do not exceed 10mA.

Frequently Asked Questions (FAQ)

Q: Can LP339M/NOPB replace LP339D in all applications?

A: No. The LP339M/NOPB is rated for 10mA typical output current compared to the LP339D's 30mA. Substitution is valid only for applications where output current requirements do not exceed 10mA. Verify your circuit's output current demand before selecting this alternative.

Q: What is the primary difference between LP339DR and LM339DT?

A: Both are 4-comparator ICs in 14-SOIC packaging with active product status. The LP339DR maintains the original LP339D electrical specifications exactly, including 30mA output current and 100µA quiescent current. The LM339DT reduces quiescent current to 2.5mA and output current to 16mA, offering lower power consumption but requiring verification for high-current output applications.

Q: Can I use LM2901AQT14-13 as a direct replacement for LP339D?

A: The LM2901AQT14-13 provides functional equivalence but uses 14-TSSOP packaging instead of 14-SOIC, requiring PCB layout modification. The part offers extended temperature range (-40°C ~ 125°C) and automotive qualification, making it suitable for demanding environments. Verify PCB footprint compatibility before implementation.

Q: What does the package designation "14-SOIC" mean?

A: 14-SOIC refers to a 14-pin Small Outline Integrated Circuit with 0.154" (3.90mm) body width. This is a surface-mount package standard. Variants like 14-SOP (4.40mm width) and 14-TSSOP (thin shrink small outline) have different physical dimensions and require different PCB footprints.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance requirement of the original LP339D.

Q: Which substitute offers the best inventory availability?

A: The LM339DT (STMicroelectronics) provides the highest inventory depth at 445,200 pcs, followed by LM339DR2G (onsemi) at 205,200 pcs. Both parts maintain active product status and 14-SOIC packaging compatibility.

Q: What is the significance of "Last Time Buy" status for LP339D?

A: Last Time Buy indicates that Texas Instruments has ceased active production and will not manufacture additional units beyond existing stock. This necessitates transition to alternative parts for new designs and future production runs. The LP339DR is the recommended active-production replacement.

Q: Can I mix different substitute parts in the same design?

A: While all listed substitutes are functionally equivalent 4-comparator ICs, mixing different manufacturers or part variants in the same design introduces supply chain complexity and potential performance variation. Standardize on a single substitute part number for consistency and simplified procurement.

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