LM339AN Equivalent & Substitute Parts

Part Overview

The LM339AN is a general-purpose comparator IC with four independent comparators in a 14-pin DIP package. Manufactured by onsemi, this device features open-collector, DTL, MOS, and TTL output types with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The LM339AN is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Substiute Parts

LM339AN

onsemiIn Stock: 15694LM339AN Datasheet

Current PartRFQ

KA339A

Fairchild SemiconductorIn Stock: 1454KA339A Datasheet

Parametric EquivalentRFQ

LM339AN

Harris CorporationIn Stock: 15713LM339AN Datasheet

DirectRFQ

LM339AN/NOPB

Texas InstrumentsIn Stock: 1604LM339AN/NOPB Datasheet

DirectRFQ

LM339N

STMicroelectronicsIn Stock: 124922LM339N Datasheet

SimilarRFQ

LM339NE3

Texas InstrumentsIn Stock: 18050LM339NE3 Datasheet

SimilarRFQ

LM339NE4

Texas InstrumentsIn Stock: 1052LM339NE4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM339AN are classified based on strict parametric compatibility within the following criteria:

Direct Equivalents maintain identical or superior electrical specifications across all critical parameters: supply voltage range, input offset voltage, input bias current, output current, quiescent current, operating temperature range, and package configuration. These parts are pin-compatible and functionally interchangeable.

Parametric Equivalents meet the core functional requirements but may have minor variations in non-critical specifications such as packaging format or inventory status. These parts are suitable for applications where the primary electrical characteristics align with design requirements.

Similar Parts share the same base product number (LM339) and package type but may have variations in output type configuration, voltage specifications, or temperature range. These parts require verification of specific application requirements before substitution.

The key parameters determining substitution eligibility are:

• Number of elements (must be 4)
• Package type (14-DIP configuration)
• Output type compatibility (Open-Collector primary)
• Supply voltage range (minimum 2V ~ 36V single or ±1V ~ ±18V dual)
• Input offset voltage (maximum 5mV @ 30V)
• Operating temperature range (minimum 0°C ~ 70°C)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM339AN/NOPB (Texas Instruments)

The LM339AN/NOPB from Texas Instruments is the preferred direct equivalent. It maintains identical electrical specifications to the original LM339AN, including supply voltage range (2V ~ 36V, ±1V ~ 18V), input offset voltage (2mV @ 5V), and output current characteristics. The device is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Operating temperature range extends to -25°C ~ 85°C, providing superior performance in extended temperature applications.

Secondary Recommendation: LM339NE3 (Texas Instruments)

The LM339NE3 is an active alternative with the same base product number and package configuration. It maintains open-collector output type and 14-DIP through-hole mounting. Input offset voltage is specified at 5mV @ 30V (versus 2mV @ 5V for the primary recommendation), and output current is rated at 20mA typical. Supply voltage range is 2V ~ 30V (±1V ~ 15V), which is narrower than the original specification. This part is suitable for applications within the reduced voltage range.

Tertiary Recommendation: LM339N (STMicroelectronics)

The LM339N from STMicroelectronics is classified as obsolete but remains available in high inventory (124,829 pcs). It provides ROHS3 compliance and maintains the 14-DIP package configuration. Supply voltage range is 2V ~ 32V (±1V ~ 16V), with input offset voltage of 5mV @ 30V. This part is suitable for legacy system maintenance where supply voltage requirements do not exceed the specified range.

Not Recommended: KA339A (Fairchild Semiconductor)

The KA339A lacks complete parametric specification data in the provided documentation. While classified as active, insufficient electrical characteristic information prevents reliable substitution assessment.

Not Recommended: LM339NE4 (Texas Instruments)

The LM339NE4 is discontinued at DiGi Electronics and has limited availability (974 pcs). While electrically similar to LM339NE3, the discontinued status makes it unsuitable for new designs or long-term production support.

Not Recommended: LM339AN (Harris Corporation)

The Harris Corporation variant is obsolete with RoHS non-compliant status. Supply voltage range is limited to 2V ~ 32V (±1V ~ 16V), and input bias current is specified at 0.1µA @ 5V, which differs from the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use LM339AN/NOPB as a direct replacement for the original LM339AN?

A: Yes. The LM339AN/NOPB from Texas Instruments is a direct equivalent with identical pin configuration, package type (14-DIP), and electrical specifications. It is pin-compatible and functionally interchangeable in all applications designed for the original LM339AN.

Q: What is the difference between LM339NE3 and LM339NE4?

A: Both parts share identical electrical specifications and package configuration. The primary difference is product status: LM339NE3 is active in production, while LM339NE4 is discontinued at DiGi Electronics. For new designs, LM339NE3 is the preferred choice due to ongoing availability.

Q: Are all substitute parts compatible with the original 14-DIP through-hole footprint?

A: Yes. All recommended substitute parts use the 14-DIP (0.300", 7.62mm) package with through-hole mounting. PCB footprints are identical and require no modification.

Q: What is the significance of the supply voltage range differences between substitute parts?

A: The original LM339AN supports 2V ~ 36V (single) or ±1V ~ 18V (dual). Some substitutes, such as LM339NE3 and LM339NE4, have a narrower range of 2V ~ 30V (±1V ~ 15V). Applications requiring supply voltages above 30V single or ±15V dual must use LM339AN/NOPB or LM339N to maintain specification compliance.

Q: Does the input offset voltage difference between parts affect circuit performance?

A: The original LM339AN specifies 2mV @ 5V input offset voltage. Substitutes such as LM339N, LM339NE3, and LM339NE4 specify 5mV @ 30V. For precision comparator applications with tight offset voltage requirements, the LM339AN/NOPB (2mV @ 5V) is the preferred choice. For general-purpose applications, the 5mV specification is typically acceptable.

Q: What is the operating temperature range for each substitute part?

A: The original LM339AN operates from 0°C to 70°C. LM339AN/NOPB extends this to -25°C to 85°C, providing superior performance in extended temperature environments. All other substitutes maintain the 0°C to 70°C range. Application temperature requirements should determine part selection.

Q: Are all substitute parts RoHS compliant?

A: LM339AN/NOPB, LM339N, LM339NE3, and LM339NE4 are ROHS3 compliant. The Harris Corporation variant is RoHS non-compliant. For applications requiring RoHS compliance, select from the compliant alternatives.

Q: Can I use KA339A as a substitute?

A: The KA339A lacks complete parametric specification data in available documentation. Insufficient electrical characteristic information prevents reliable substitution assessment. Use only parts with complete specification data.