LM139AW-SMD Equivalent & Substitute Parts

Part Overview

The LM139AW-SMD is a low-power, low-offset voltage general-purpose comparator manufactured by Texas Instruments. This quad comparator integrates four independent comparison channels in a 14-pin CFlatPack surface-mount package. The device operates across a wide supply voltage range (5V ~ 30V single supply, ±2.5V ~ 15V dual supply) and features open-collector/open-drain outputs suitable for logic-level interfacing.

The LM139AW-SMD maintains Active product status with 628 units in current inventory. Substitute parts are identified based on matching functional classification (general-purpose quad comparators), compatible output types, overlapping supply voltage ranges, and equivalent packaging form factors. Substitution becomes necessary when the original part is unavailable, when alternative packaging or temperature grades are required, or when sourcing from different manufacturers is preferred.

Substiute Parts

LM139AW-SMD

Texas InstrumentsIn Stock: 738LM139AW-SMD Datasheet

Current PartRFQ

LM239APT

STMicroelectronicsIn Stock: 1402LM239APT Datasheet

SimilarRFQ

LM239DTBR2G

onsemiIn Stock: 6636LM239DTBR2G Datasheet

SimilarRFQ

LM2901D

STMicroelectronicsIn Stock: 36146LM2901D Datasheet

SimilarRFQ

LM2901EDR2G

onsemiIn Stock: 2931LM2901EDR2G Datasheet

SimilarRFQ

LM2901HYDT

STMicroelectronicsIn Stock: 4399LM2901HYDT Datasheet

SimilarRFQ

LM2901YDT

STMicroelectronicsIn Stock: 2767LM2901YDT Datasheet

SimilarRFQ

LM339D

STMicroelectronicsIn Stock: 7047LM339D Datasheet

SimilarRFQ

LM339DTBR2G

onsemiIn Stock: 2563LM339DTBR2G Datasheet

SimilarRFQ

LM339EDR2G

onsemiIn Stock: 5116LM339EDR2G Datasheet

SimilarRFQ

MAX516AEWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 17450MAX516AEWG+ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM139AW-SMD are classified based on the following substitution criteria:

Primary Substitution Criteria:

• Quad comparator configuration (4 independent comparison channels)
• General-purpose comparator classification
• Output type compatibility: Open-Collector, Open-Drain, or CMOS/TTL logic-level outputs
• Supply voltage range overlap with 5V ~ 30V single supply and ±2.5V ~ 15V dual supply
• Surface-mount packaging (14-pin configurations)
• Input offset voltage ≤ 7mV
• Input bias current ≤ 0.25µA
• Output current ≥ 16mA
• Quiescent current ≤ 2.5mA
• RoHS3 compliance
• Active product status

Substitution Groups:

Group 1: 14-TSSOP Package Substitutes

• LM239APT (STMicroelectronics)
• LM239DTBR2G (onsemi)
• LM339DTBR2G (onsemi)

Group 2: 14-SOIC Package Substitutes

• LM2901D (STMicroelectronics)
• LM2901EDR2G (onsemi)
• LM2901HYDT (STMicroelectronics)
• LM2901YDT (STMicroelectronics)
• LM339D (STMicroelectronics)
• LM339EDR2G (onsemi)

Group 3: Alternative Package (24-SOIC)

• MAX516AEWG+ (Analog Devices Inc./Maxim Integrated)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM2901YDT and LM2901D are the most direct substitutes for the LM139AW-SMD. Both devices maintain the extended operating temperature range (-40°C ~ 125°C), support the full supply voltage range required by the original part, and deliver equivalent electrical performance. LM2901YDT includes AEC-Q100 automotive qualification, making it suitable for applications requiring automotive-grade reliability. Both parts are available in 14-SOIC surface-mount packaging and carry ROHS3 compliance.

Secondary Substitutes (Package Variation):

LM239APT, LM239DTBR2G, and LM339DTBR2G provide functional equivalence in 14-TSSOP packaging. These parts maintain quad comparator configuration and general-purpose operation but use a different surface-mount package footprint. LM239APT from STMicroelectronics offers the lowest input offset voltage (2mV @ 30V) matching the original specification. onsemi variants (LM239DTBR2G, LM339DTBR2G) support extended supply voltage ranges (3V ~ 36V) and are available in higher inventory quantities.

Temperature-Constrained Substitutes:

LM339D and LM339DTBR2G operate within a narrower temperature range (0°C ~ 70°C) compared to the LM139AW-SMD (-55°C ~ 125°C). These parts are suitable only for applications not requiring the full extended temperature specification of the original device.

Alternative Architecture (Limited Compatibility):

MAX516AEWG+ from Analog Devices Inc./Maxim Integrated operates in a restricted supply voltage range (4.75V ~ 16.5V) and uses 24-SOIC packaging. This part is not recommended as a direct substitute due to supply voltage limitations and package incompatibility, though it maintains quad comparator functionality and ROHS3 compliance.

Inventory and Availability:

LM2901EDR2G (onsemi, 2897 units) and LM2901D (STMicroelectronics, 36100 units) offer the highest inventory availability among 14-SOIC substitutes. LM239DTBR2G (onsemi, 6540 units) provides strong availability in 14-TSSOP packaging.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LM139AW-SMD with LM2901YDT without circuit modification?

A: Yes. LM2901YDT is a direct functional substitute. Both devices are quad comparators with open-collector/open-drain outputs, matching supply voltage ranges, and equivalent electrical specifications. The 14-SOIC package footprint is compatible with standard PCB layouts. No circuit modifications are required.

Q2: What is the key difference between 14-TSSOP and 14-SOIC packages?

A: Both are 14-pin surface-mount packages but differ in physical dimensions and pin pitch. 14-TSSOP (Thin Shrink Small Outline Package) has a 0.173" width with 0.65mm pin pitch. 14-SOIC (Small Outline Integrated Circuit) has a 0.154" width with 1.27mm pin pitch. PCB footprints are not interchangeable; the correct footprint must be used during board design or rework.

Q3: Why does LM139AW-SMD specify 1000pA input bias current while substitutes specify 0.1µA to 0.25µA?

A: The LM139AW-SMD uses bipolar input stage technology, resulting in higher input bias current. Substitute parts using CMOS input stages (LM239 series, LM2901 series) exhibit lower input bias current. Both specifications are acceptable for general-purpose comparator applications. Lower input bias current in substitutes may improve performance in high-impedance signal conditioning circuits.

Q4: Is LM2901HYDT suitable for non-automotive applications?

A: LM2901HYDT carries AEC-Q100 automotive qualification and is designed for automotive-grade reliability. It is fully suitable for non-automotive applications. The automotive qualification ensures higher reliability standards and extended environmental testing, making it acceptable for industrial and commercial use.

Q5: Can I use MAX516AEWG+ as a substitute?

A: MAX516AEWG+ is not recommended as a direct substitute. The supply voltage range (4.75V ~ 16.5V) does not support the full ±2.5V ~ 15V dual supply specification of the LM139AW-SMD. Additionally, the 24-SOIC package is physically incompatible with 14-pin footprints. Use only if your application operates within the restricted voltage range and PCB layout accommodates the larger package.

Q6: What is the significance of RoHS3 compliance for all listed parts?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that all parts meet European environmental regulations restricting lead, cadmium, mercury, and other hazardous substances. All listed substitutes maintain ROHS3 compliance, ensuring regulatory compatibility for applications subject to environmental standards.

Q7: Which substitute offers the best performance for low-temperature operation below -40°C?

A: LM139AW-SMD and LM2901YDT both support -55°C minimum operating temperature. LM2901D also supports -40°C ~ 125°C range. For applications requiring operation below -40°C, LM139AW-SMD or LM2901YDT are the only suitable options among the listed substitutes.

Q8: Are there packaging considerations when switching from CFlatPack to SOIC or TSSOP?

A: Yes. CFlatPack, SOIC, and TSSOP packages have different physical dimensions, pin pitches, and PCB footprints. Direct board-level substitution is not possible without PCB rework or redesign. Verify footprint compatibility before selecting a substitute. Consult package datasheets for precise dimensional specifications.

Q9: What is the practical difference in propagation delay between LM139AW-SMD (1.3µs typical) and substitutes with unspecified propagation delay?

A: The LM139AW-SMD specifies 1.3µs typical propagation delay. Substitute parts with unspecified propagation delay (LM2901HYDT, LM239DTBR2G, LM339 series) typically exhibit similar performance within the same device family. For timing-critical applications, contact the manufacturer for detailed propagation delay specifications before substitution.

Q10: Can I mix different substitute parts in the same design?

A: Mixing different substitute parts is not recommended for production designs. Maintain consistency within a single design to ensure uniform electrical performance, thermal characteristics, and long-term reliability. If substitution is necessary, qualify the new part through complete functional and environmental testing before production release.