LM339NS Equivalent & Substitute Parts

Part Overview

The LM339NS is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent differential comparators with open-collector outputs. This device operates across a wide supply voltage range (2V ~ 30V single supply, ±1V ~ 15V dual supply) and is designed for precision voltage comparison applications in analog signal processing circuits.

The LM339NS maintains Active product status and is RoHS3 compliant. Substitute parts are identified based on functional equivalence in comparator topology, electrical performance parameters, and package compatibility. Alternative sources and package options may be required due to inventory availability, supply chain considerations, or specific application requirements for extended temperature ranges or automotive-grade qualification.

Substiute Parts

LM339NS

Texas InstrumentsIn Stock: 3143LM339NS Datasheet

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LM2901AQS14-13

Diodes IncorporatedIn Stock: 20116LM2901AQS14-13 Datasheet

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LM2901QT14-13

Diodes IncorporatedIn Stock: 7691LM2901QT14-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM339NS are qualified based on the following substitution criteria:

Functional Equivalence: All substitute parts maintain four independent comparator elements with open-collector or compatible output configurations. This ensures pin-level and functional compatibility in existing circuit designs.

Electrical Parameter Compatibility: Substitute parts operate within the same or broader supply voltage ranges. The LM339NS operates at 2V ~ 30V (single) and ±1V ~ 15V (dual). Substitute parts must support these voltage ranges or exceed them. Input offset voltage, input bias current, and output current specifications must be equal to or better than the main part to ensure drop-in compatibility.

Package Compatibility: The primary package is 14-SOIC with 0.209" width. Substitute parts are available in alternative 14-pin surface-mount packages (14-SOIC and 14-TSSOP) that maintain the same pin count and functional pinout, allowing board-level substitution with potential PCB layout adjustments.

Compliance and Certification: All substitute parts maintain RoHS3 compliance and MSL Level 1 rating. Extended temperature range variants (-40°C ~ 125°C) and automotive-grade options (AEC-Q100 qualified) are available from Diodes Incorporated for applications requiring enhanced environmental performance.

Key Parameters for Substitution Decision:

• Number of Elements: 4 (mandatory)
• Output Type: Open-Collector or compatible (CMOS, TTL, MOS)
• Supply Voltage Range: Must encompass 2V ~ 30V minimum
• Input Bias Current: ≤ 0.25µA @ 5V
• Output Current: ≥ 16mA @ 5V
• Package Pin Count: 14-pin surface mount

Parameter Comparison

Engineering Selection Recommendations

LM2901AQS14-13 (Diodes Incorporated)

This substitute part is functionally equivalent to the LM339NS with enhanced electrical performance and extended environmental specifications. The LM2901AQS14-13 features superior input offset voltage (2mV vs. 5mV), broader supply voltage range (2V ~ 36V vs. 2V ~ 30V), and extended operating temperature range (-40°C ~ 125°C vs. 0°C ~ 70°C). The device carries AEC-Q100 automotive qualification, making it suitable for industrial and automotive applications requiring enhanced reliability. The 14-SOIC package maintains surface-mount compatibility, though the reduced package width (0.154" vs. 0.209") requires PCB layout verification. This part is recommended for applications requiring extended temperature operation or automotive-grade certification while maintaining functional equivalence.

LM2901QT14-13 (Diodes Incorporated)

This substitute part provides functional equivalence with automotive-grade qualification and extended temperature range. The LM2901QT14-13 operates across 2V ~ 36V supply voltage and -40°C ~ 125°C temperature range, exceeding the LM339NS specifications. Input offset voltage is specified at 7mV, which remains within acceptable tolerance for general-purpose comparator applications. The 14-TSSOP package offers a different form factor (0.173" width) compared to the standard 14-SOIC, requiring PCB layout adjustment but providing space optimization benefits. This part is recommended for applications requiring automotive qualification, extended temperature range, or alternative package geometry within the same pin count and functional specification.

Selection Basis

Both substitute parts maintain Active product status and RoHS3 compliance. The choice between LM2901AQS14-13 and LM2901QT14-13 depends on package requirements: the 14-SOIC variant (LM2901AQS14-13) provides closer dimensional compatibility to the original LM339NS package, while the 14-TSSOP variant (LM2901QT14-13) offers alternative footprint options. Both parts support the full supply voltage range of the LM339NS and maintain equivalent input bias current and output current specifications, ensuring direct functional substitution in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the LM2901AQS14-13 directly replace the LM339NS on an existing PCB?

A: Functional substitution is supported. Both parts feature identical pin counts (14-pin) and pinout configuration. However, the LM2901AQS14-13 package width is 0.154" compared to the LM339NS at 0.209", requiring verification of PCB pad spacing and solder reflow profile compatibility. Electrical performance is equivalent or superior, supporting drop-in circuit operation.

Q: What is the difference between the LM2901AQS14-13 and LM2901QT14-13?

A: Both parts are manufactured by Diodes Incorporated and provide equivalent electrical performance. The primary difference is package type: LM2901AQS14-13 uses 14-SOIC (0.154" width) while LM2901QT14-13 uses 14-TSSOP (0.173" width). Both maintain identical pin count, functional pinout, and electrical specifications. Package selection depends on PCB layout requirements and available footprint space.

Q: Are the substitute parts suitable for automotive applications?

A: Yes. Both LM2901AQS14-13 and LM2901QT14-13 carry AEC-Q100 automotive qualification and operate across extended temperature range (-40°C ~ 125°C), exceeding the commercial-grade LM339NS specification (0°C ~ 70°C). These parts are qualified for automotive-grade applications requiring enhanced environmental performance and reliability certification.

Q: What is the impact of the lower input offset voltage in the LM2901AQS14-13?

A: The LM2901AQS14-13 specifies 2mV input offset voltage compared to 5mV for the LM339NS. This represents improved precision and reduced voltage error in comparison operations. For general-purpose comparator applications, this enhanced specification provides better accuracy without requiring circuit redesign. Existing designs will operate with improved performance margins.

Q: Can I use the LM2901QT14-13 in place of the LM339NS if my PCB layout uses 14-SOIC footprints?

A: No. The LM2901QT14-13 uses 14-TSSOP package geometry, which is not compatible with 14-SOIC PCB footprints. The LM2901AQS14-13 (14-SOIC variant) is the appropriate substitute for existing 14-SOIC layouts. If package conversion is required, PCB redesign and re-layout are necessary.

Q: What is the quiescent current difference between the main part and substitutes?

A: The LM339NS specifies maximum quiescent current at 2mA, while both substitute parts (LM2901AQS14-13 and LM2901QT14-13) specify 2.5mA maximum. This 0.5mA difference is negligible for most applications and does not impact circuit design or power budget calculations in typical comparator circuits.

Q: Are all three parts RoHS3 compliant?

A: Yes. The LM339NS, LM2901AQS14-13, and LM2901QT14-13 are all RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, meeting environmental and regulatory requirements for commercial and industrial applications.