LM139AWG-QMLV Equivalent & Substitute Parts Reference

Part Overview

The LM139AWG-QMLV is a low-power, low-offset voltage quad comparator manufactured by Texas Instruments, designed for general-purpose comparison applications. This device features open-collector/open-drain output configuration and operates across a wide supply voltage range of 5V to 30V (single supply) or ±2.5V to ±15V (dual supply). The part is currently in active production status with 867 pieces in stock inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter tolerances for this product category, particularly when the main part faces supply constraints, end-of-life considerations, or when alternative packaging formats better suit specific application requirements.

Substiute Parts

LM139AWG-QMLV

Texas InstrumentsIn Stock: 956LM139AWG-QMLV Datasheet

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LM239DR2G

onsemiIn Stock: 105414LM239DR2G Datasheet

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LM2901DR2G

onsemiIn Stock: 127372LM2901DR2G Datasheet

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LM2901EDR2G

onsemiIn Stock: 2931LM2901EDR2G Datasheet

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LM2901HYDT

STMicroelectronicsIn Stock: 4399LM2901HYDT Datasheet

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LM2901PT

STMicroelectronicsIn Stock: 26319LM2901PT Datasheet

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LM2901VDR2G

onsemiIn Stock: 3112LM2901VDR2G Datasheet

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LM2901YPT

STMicroelectronicsIn Stock: 55402LM2901YPT Datasheet

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LM339AD

MotorolaIn Stock: 1466LM339AD Datasheet

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LM339QT

STMicroelectronicsIn Stock: 5820LM339QT Datasheet

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MAX516AEWG+

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

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MAX516BCWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 906MAX516BCWG+ Datasheet

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NCV2901DTBR2G

onsemiIn Stock: 35182NCV2901DTBR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM139AWG-QMLV are classified based on strict electrical and mechanical compatibility within the general-purpose quad comparator category. The substitution logic is determined by the following critical parameters:

Primary Substitution Criteria:

1. Number of Elements: All substitutes must contain exactly 4 comparator elements (quad configuration)
2. Output Type Compatibility: Open-collector or open-drain output capability required; CMOS/TTL outputs acceptable where pin-compatible
3. Supply Voltage Overlap: Substitute must support the operating range of 5V to 30V single supply or equivalent dual supply range
4. Package Compatibility: Surface-mount packages only; pin count and footprint must accommodate 14-pin configurations (SOIC, CSOIC, TSSOP variants)
5. Input Offset Voltage: Maximum 7mV @ 5V acceptable; lower values (2mV) indicate higher precision
6. Input Bias Current: Maximum 1µA acceptable; lower values indicate reduced loading
7. Quiescent Current: Maximum 2.5mA acceptable; lower values indicate reduced power consumption
8. Operating Temperature: Minimum range -40°C to 85°C required; extended ranges (-55°C to 125°C) provide additional margin
9. RoHS Compliance: ROHS3 compliance required for environmental standards
10. Product Status: Active manufacturing status preferred; substitutes in active production ensure long-term availability

Substitutes are grouped by manufacturer and package type. Electrical performance variations within specified tolerances do not disqualify a part from substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 Substitutes (Highest Compatibility):

The following parts provide direct functional equivalence with minimal design impact:

LM2901DR2G (onsemi) and LM2901EDR2G (onsemi): Both devices maintain quad comparator configuration with 14-SOIC packaging. Supply voltage range extends to 3V minimum and 36V maximum, encompassing the LM139AWG-QMLV operating window. Input offset voltage specification of 7mV @ 5V remains within acceptable tolerance for general-purpose applications. Quiescent current of 2.5mA matches the main part specification. Both parts carry ROHS3 compliance and MSL-1 rating. Inventory availability is substantial (127,336 and 2,897 units respectively), ensuring supply continuity.

LM2901VDR2G (onsemi): Provides identical electrical specifications to LM2901DR2G with extended operating temperature range of -40°C to 125°C, matching the main part's temperature envelope. 14-SOIC package maintains PCB layout compatibility. MSL-1 rating and ROHS3 compliance confirmed. Inventory of 3,100 units supports production requirements.

LM2901PT and LM2901YPT (STMicroelectronics): Both devices employ 14-TSSOP packaging, requiring PCB layout modification but maintaining electrical equivalence. Supply voltage range 2V to 32V encompasses the main part specification. Input offset voltage of 7mV @ 5V and quiescent current of 2.5mA remain within tolerance. LM2901YPT includes AEC-Q100 automotive qualification and extended temperature range (-40°C to 125°C). Inventory availability is high (26,244 and 55,300 units respectively).

Tier 2 Substitutes (Functional Equivalence with Design Considerations):

LM239DR2G (onsemi): Quad comparator in 14-SOIC package with supply range 3V to 36V. Input offset voltage of 5mV @ 5V provides improved precision over the main part. Operating temperature range limited to -25°C to 85°C, reducing margin for extended temperature applications. Inventory of 105,400 units provides excellent supply security. ROHS3 and MSL-1 compliance confirmed.

LM2901HYDT (STMicroelectronics): Automotive-grade device with AEC-Q100 qualification in 14-SOIC package. Supply range 2V to 36V exceeds main part specification. MSL-3 rating (168 hours) requires controlled moisture exposure during assembly. Operating temperature range not specified in provided data. Inventory of 4,310 units supports moderate production volumes.

LM339AD (Motorola): Precision quad comparator with input offset voltage of 2mV @ 5V, matching the main part's precision specification. Input bias current of 0.025µA provides superior input loading characteristics. Operating temperature range limited to 0°C to 70°C, restricting use in extended temperature applications. Propagation delay of 300ns (typical) indicates faster response than the main part's 1.3µs specification. Inventory of 1,450 units is limited. Package designation as 14-SO indicates potential footprint variation requiring verification.

Tier 3 Substitutes (Package Variant or Limited Compatibility):

LM339QT (STMicroelectronics): 16-QFN package represents significant PCB layout change from the main part's 14-CSOIC configuration. Quad comparator configuration maintained. Supply range 2V to 36V and quiescent current 2.5mA remain compatible. Inventory of 5,783 units available. ROHS3 and MSL-1 compliance confirmed. Requires PCB redesign for implementation.

MAX516AEWG+ (Analog Devices Inc./Maxim Integrated): 24-SOIC package contains quad comparator elements but represents substantial package size increase. Supply voltage range limited to 4.75V to 16.5V, restricting operation at lower supply voltages. Quiescent current of 10mA significantly exceeds main part specification, increasing power consumption. Propagation delay of 1.5µs slightly exceeds main part specification. Inventory of 17,385 units available. ROHS3 and MSL-1 compliance confirmed. Suitable only when package size increase and higher power consumption are acceptable.

Selection Criteria Summary:

1. For direct replacement with minimal PCB modification: Select LM2901DR2G, LM2901EDR2G, or LM2901VDR2G
2. For extended temperature applications: Select LM2901VDR2G, LM2901PT, or LM2901YPT
3. For automotive applications: Select LM2901YPT (AEC-Q100 qualified)
4. For precision applications: Select LM339AD (2mV offset voltage)
5. For maximum inventory availability: Select LM239DR2G or LM2901YPT
6. For alternative package formats: Select LM2901PT/LM2901YPT (TSSOP) or LM339QT (QFN)

All recommended substitutes maintain active production status, ROHS3 compliance, and surface-mount assembly compatibility.

Frequently Asked Questions (FAQ)

Q1: Can LM2901DR2G directly replace LM139AWG-QMLV without PCB modification?

A: Yes. Both devices are quad comparators in 14-pin surface-mount packages (SOIC configuration). Pin assignments are compatible. Electrical specifications overlap within acceptable tolerances: supply voltage range 3V to 36V encompasses the main part's 5V to 30V window; input offset voltage of 7mV @ 5V is within general-purpose comparator tolerance; quiescent current of 2.5mA matches the main part specification. No PCB layout changes are required.

Q2: What is the primary difference between LM2901DR2G and LM2901EDR2G?

A: Both parts are functionally identical quad comparators with identical electrical specifications. The primary difference is packaging format: LM2901DR2G is supplied in Cut Tape (CT) & Digi-Reel format, while LM2901EDR2G is supplied in Tape & Reel (TR) format. Inventory levels differ (127,336 vs. 2,897 units). Selection depends on procurement volume and handling requirements.

Q3: Why does LM2901YPT require 14-TSSOP package instead of 14-SOIC?

A: LM2901YPT is manufactured by STMicroelectronics in 14-TSSOP (Thin Shrink Small Outline Package) format, which differs from the 14-SOIC package used in LM2901DR2G. TSSOP packages have narrower body width (4.40mm vs. 3.90mm for SOIC) and different pin spacing. PCB footprint modification is required. Electrical performance is equivalent; package selection depends on available PCB real estate and design constraints.

Q4: Is LM339AD suitable for applications requiring extended temperature operation?

A: No. LM339AD operates over 0°C to 70°C temperature range, which is narrower than the main part's -55°C to 125°C specification. LM339AD is unsuitable for applications requiring operation below 0°C or above 70°C. For extended temperature requirements, select LM2901VDR2G, LM2901PT, or LM2901YPT, which all support -40°C to 125°C operation.

Q5: What does AEC-Q100 qualification mean for LM2901YPT?

A: AEC-Q100 is an automotive industry qualification standard indicating the device has undergone rigorous testing for automotive applications, including thermal cycling, vibration, and reliability assessments. LM2901YPT meets these automotive-grade requirements. This qualification is beneficial for automotive, industrial, and harsh-environment applications but is not required for general consumer electronics.

Q6: Can MAX516AEWG+ be used as a direct substitute?

A: MAX516AEWG+ is not recommended as a direct substitute. While it contains four comparator elements, the 24-SOIC package is significantly larger than the main part's 14-CSOIC package, requiring substantial PCB redesign. Supply voltage range is limited to 4.75V to 16.5V, restricting operation at lower supply voltages. Quiescent current of 10mA is five times higher than the main part, significantly increasing power consumption. Use MAX516AEWG+ only when package size increase and higher power consumption are acceptable design trade-offs.

Q7: What is the significance of MSL-1 vs. MSL-3 moisture sensitivity rating?

A: MSL (Moisture Sensitivity Level) indicates the device's sensitivity to moisture absorption during storage and handling. MSL-1 (Unlimited) means the device can be stored indefinitely without moisture control. MSL-3 (168 Hours) means the device must be used within 168 hours of package opening or must be baked to remove absorbed moisture before assembly. LM2901HYDT carries MSL-3 rating, requiring controlled moisture exposure during manufacturing. Most substitutes carry MSL-1 rating, simplifying supply chain handling.

Q8: Why does LM339AD have lower input bias current (0.025µA) compared to other substitutes?

A: LM339AD uses different input stage design technology, resulting in significantly lower input bias current (0.025µA vs. 0.25µA for most other substitutes). Lower input bias current reduces loading on the signal source, beneficial for high-impedance input applications. However, LM339AD's limited operating temperature range (0°C to 70°C) and lower inventory availability (1,450 units) may offset this advantage for general-purpose applications.

Q9: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance except LM339AD, which does not specify RoHS status in the provided data. ROHS3 compliance indicates the device contains no restricted substances (lead, cadmium, mercury, etc.) and meets environmental regulations for European and global markets. Verify LM339AD RoHS status with the manufacturer before selection if RoHS compliance is a requirement.

Q10: Which substitute offers the best inventory availability?

A: LM2901DR2G offers the highest inventory availability with 127,336 units in stock, followed by LM2901YPT with 55,300 units. These high inventory levels ensure supply continuity for production programs. LM2901EDR2G (2,897 units) and LM2901VDR2G (3,100 units) have more limited availability but remain suitable for moderate production volumes.