LM339N-NG Equivalent & Substitute Parts

Part Overview

The LM339N-NG is a general-purpose comparator manufactured by Texas Instruments, featuring four independent open-collector output elements in a 14-PDIP package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The LM339N-NG operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is suitable for applications requiring precision voltage comparison with open-collector output capability.

Substiute Parts

LM339N-NG

Texas InstrumentsIn Stock: 1002LM339N-NG Datasheet

Current PartRFQ

LM339N

STMicroelectronicsIn Stock: 124922LM339N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM339N-NG is determined by strict alignment of the following critical parameters:

Mandatory Matching Criteria:

• Number of Elements: 4 independent comparators
• Output Type: Open-Collector configuration
• Package Type: 14-DIP (0.300", 7.62mm) through-hole
• Supply Voltage Range: Minimum 2V to 36V single supply capability
• Input Offset Voltage: Maximum 5mV @ 30V
• Input Bias Current: Maximum 0.25µA @ 5V
• Output Current: Minimum 16mA @ 5V capability
• Operating Temperature: 0°C to 70°C minimum
• RoHS Compliance: ROHS3 Compliant

The LM339N manufactured by STMicroelectronics meets all mandatory criteria and serves as the primary equivalent substitute. This part maintains identical pinout, package footprint, and functional performance within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

The LM339N manufactured by STMicroelectronics is the direct functional equivalent for the obsolete LM339N-NG. Both devices are classified as obsolete products, indicating end-of-life status from their respective manufacturers. Selection between these parts should be based on current procurement availability and supply chain reliability.

Compliance Considerations:

• Both parts maintain ROHS3 compliance, suitable for applications requiring lead-free construction
• STMicroelectronics LM339N carries REACH Unaffected status and EAR99 export classification
• Moisture Sensitivity Level (MSL) for STMicroelectronics variant is rated 1 (Unlimited), indicating no moisture sensitivity constraints

Electrical Performance: The STMicroelectronics LM339N operates within a slightly narrower supply voltage range (2V to 32V single supply versus 2V to 36V for the Texas Instruments variant) and permits a relaxed input offset voltage specification (5mV maximum versus 2mV). These differences are non-critical for most general-purpose comparator applications operating within standard supply voltages (5V, ±15V).

Procurement Status: STMicroelectronics LM339N maintains significantly higher inventory availability (124,829 pieces) compared to the original Texas Instruments LM339N-NG (967 pieces), providing superior supply chain continuity for new designs and production support.

Frequently Asked Questions (FAQ)

Q: Can the STMicroelectronics LM339N directly replace the Texas Instruments LM339N-NG without circuit modification?

A: Yes. Both devices share identical pinout, package footprint (14-DIP), and functional performance within the specified parameter ranges. No circuit modifications are required for direct substitution in applications operating within the overlapping supply voltage specifications (2V to 32V single supply, ±1V to ±16V dual supply).

Q: What is the significance of the relaxed input offset voltage specification in the STMicroelectronics variant?

A: The STMicroelectronics LM339N permits a maximum input offset voltage of 5mV compared to 2mV for the Texas Instruments LM339N-NG. This relaxation does not affect substitution suitability for general-purpose comparator applications. Applications requiring input offset voltage below 5mV should evaluate specific device characterization data.

Q: Are there package or mounting differences between these devices?

A: No. Both devices are supplied in 14-DIP (0.300", 7.62mm) through-hole packages with identical pinout and mechanical dimensions. PCB layouts and socket compatibility are fully interchangeable.

Q: What is the practical difference between the supply voltage ranges?

A: The Texas Instruments LM339N-NG supports operation up to 36V single supply, while the STMicroelectronics LM339N is rated to 32V. For applications using standard supply voltages (5V, ±12V, ±15V), this difference is not operationally significant. Applications requiring operation above 32V single supply should retain the original Texas Instruments device or evaluate alternative comparator families.

Q: How does the higher inventory availability of the STMicroelectronics variant affect procurement decisions?

A: The STMicroelectronics LM339N maintains substantially higher stock levels (124,829 pieces versus 967 pieces), reducing procurement lead times and supply chain risk. For new designs and production quantities, the STMicroelectronics variant offers superior availability and cost efficiency while maintaining full functional equivalence.

Q: Are there any compliance or certification differences?

A: Both devices are ROHS3 compliant. The STMicroelectronics variant carries additional REACH Unaffected status and EAR99 export classification. Both devices are rated MSL 1 or equivalent, indicating no moisture sensitivity constraints for standard handling and storage.