LM339DR2 Equivalent & Substitute Parts

Part Overview

The LM339DR2 is a quad comparator integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The LM339DR2 operates as a general-purpose comparator with open-collector output configuration, suitable for applications requiring voltage comparison and signal conditioning across a wide supply voltage range.

Substiute Parts

LM339DR2

onsemiIn Stock: 25264LM339DR2 Datasheet

Current PartRFQ

LM339DR2G

onsemiIn Stock: 205270LM339DR2G Datasheet

DirectRFQ

LM339DRG3

Texas InstrumentsIn Stock: 22037LM339DRG3 Datasheet

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LM239PT

STMicroelectronicsIn Stock: 65299LM239PT Datasheet

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LM2901Q4T

STMicroelectronicsIn Stock: 15335LM2901Q4T Datasheet

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LM339DT

STMicroelectronicsIn Stock: 445298LM339DT Datasheet

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MAX516BCNG+

Analog Devices Inc./Maxim IntegratedIn Stock: 1240MAX516BCNG+ Datasheet

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RT2901HYDT

STMicroelectronicsIn Stock: 1034RT2901HYDT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM339DR2 is determined by the following critical parameters:

Package Compatibility: The 14-SOIC surface mount package is the primary constraint. Direct substitutes must maintain identical pinout and footprint to ensure PCB compatibility without layout modifications.

Electrical Specifications: Supply voltage range, input offset voltage, input bias current, output current capability, and quiescent current define functional equivalence. Substitute parts must operate within the same or broader electrical operating envelope.

Output Configuration: The open-collector output type is essential for applications requiring pull-up resistor networks and logic-level interfacing.

Product Status & Compliance: Active parts with current manufacturing status and RoHS3 compliance are preferred for new designs and long-term availability.

Substitute parts are grouped into two categories:

Direct Substitutes (14-SOIC Package): LM339DR2G, LM339DRG3, and LM339DT maintain identical 14-SOIC packaging and pinout, enabling direct replacement without PCB modifications.

Similar Substitutes (Alternative Packages): LM239PT (14-TSSOP), LM2901Q4T (16-QFN), MAX516BCNG+ (24-DIP), and RT2901HYDT (14-SOIC) offer equivalent functionality with different package footprints, requiring PCB layout changes.

Parameter Comparison

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes):

LM339DR2G is the primary recommended substitute. Manufactured by onsemi with active product status and RoHS3 compliance, it maintains identical 14-SOIC packaging and pinout. Supply voltage range extends to 3V ~ 36V with ±1.5V ~ 18V dual supply capability, providing broader operational envelope than the obsolete LM339DR2.

LM339DT (STMicroelectronics) is an alternative direct substitute with active status and RoHS3 compliance. Operating temperature range matches the original specification (0°C ~ 70°C), with equivalent electrical characteristics suitable for standard industrial applications.

LM339DRG3 (Texas Instruments) is available but classified as Last Time Buy, indicating limited future availability. This part is suitable only for existing inventory management or short-term production runs.

For Applications Requiring Extended Temperature Range:

RT2901HYDT extends operating temperature to -40°C ~ 150°C while maintaining 14-SOIC packaging. This part is appropriate for automotive, industrial, or military-grade applications requiring wider temperature performance.

LM239PT (14-TSSOP package) and LM2901Q4T (16-QFN package) offer active status and RoHS3 compliance with extended temperature ranges (-40°C ~ 105°C and unspecified respectively). These require PCB layout modifications due to different package footprints.

For Legacy Through-Hole Applications:

MAX516BCNG+ provides 24-DIP through-hole packaging with active status and RoHS3 compliance. This part is suitable only for designs requiring through-hole mounting technology and is not recommended for new surface mount designs.

Compliance Considerations:

All recommended substitutes are RoHS3 compliant, addressing environmental and regulatory requirements. The original LM339DR2 is RoHS non-compliant, making transition to compliant alternatives necessary for new designs and regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can LM339DR2G be used as a direct replacement for LM339DR2 without PCB modifications?

A: Yes. LM339DR2G maintains identical 14-SOIC packaging, pinout, and surface mount footprint. No PCB layout changes are required. Electrical specifications are compatible with the original design envelope.

Q: What is the primary difference between LM339DR2G and LM339DRG3?

A: Both are 14-SOIC quad comparators with equivalent electrical performance. LM339DR2G (onsemi) has active product status with indefinite availability. LM339DRG3 (Texas Instruments) is classified as Last Time Buy, indicating limited future manufacturing. For new designs, LM339DR2G is preferred.

Q: Why does MAX516BCNG+ have higher quiescent current (10mA) compared to other substitutes (2-2.5mA)?

A: MAX516BCNG+ is a 24-DIP through-hole package with different internal architecture optimized for legacy applications. The higher quiescent current reflects this design approach and is not suitable for low-power applications where the original LM339DR2 was specified.

Q: Can LM239PT be used if my PCB layout can accommodate a 14-TSSOP package?

A: Yes. LM239PT is functionally equivalent with active product status and RoHS3 compliance. The 14-TSSOP package requires PCB footprint changes but offers extended operating temperature range (-40°C ~ 105°C) compared to standard 0°C ~ 70°C specifications.

Q: Is RT2901HYDT suitable for automotive applications?

A: RT2901HYDT extends operating temperature to -40°C ~ 150°C, making it suitable for automotive and industrial environments. It maintains 14-SOIC packaging with active product status and RoHS3 compliance. Verify specific automotive qualification requirements with the manufacturer.

Q: What is the impact of switching from LM339DR2 (RoHS non-compliant) to a RoHS3 compliant substitute?

A: RoHS3 compliance eliminates restricted substances (lead, cadmium, mercury, hexavalent chromium, PBBs, PBDEs) from the component. This is required for products sold in EU markets and increasingly mandated by global supply chain standards. All recommended substitutes are RoHS3 compliant.

Q: Can multiple substitute parts be used interchangeably within the same design?

A: Direct substitutes within the 14-SOIC package family (LM339DR2G, LM339DRG3, LM339DT) are interchangeable without PCB modifications. Alternative package types (LM239PT, LM2901Q4T, MAX516BCNG+, RT2901HYDT) require individual PCB layout validation and are not interchangeable without design changes.

Q: What inventory considerations apply to LM339DRG3?

A: LM339DRG3 is classified as Last Time Buy, indicating the manufacturer has announced end-of-life production. Current inventory is 21,985 pieces. This part should be used only for existing production support or inventory management, not for new design commitments.