LM139AW-QMLV Equivalent & Substitute Parts

Part Overview

The LM139AW-QMLV is a low-power, low-offset voltage general-purpose comparator manufactured by Texas Instruments. This quad comparator features open-collector/open-drain output configuration 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) with minimal input offset voltage of 2mV at 30V and low quiescent current of 2mA maximum.

The LM139AW-QMLV maintains Active product status with 2228 units in current inventory. Substitute parts are necessary when the 14-CFlatPack package is unavailable, when alternative supply voltage ranges are required, or when different packaging formats better suit manufacturing processes. All substitute parts listed maintain the core functional characteristics: quad general-purpose comparator topology, open-collector/open-drain output capability, and ROHS3 compliance.

Key Parameters

Parameter	Value	Condition
Number of Elements	4	Quad configuration
Output Type	Open-Collector, Open-Drain	Primary output configuration
Voltage - Supply, Single/Dual (±)	5V ~ 30V, ±2.5V ~ 15V	Operating range
Voltage - Input Offset (Max)	2mV	@ 30V
Current - Input Bias (Max)	1000pA	@ 5V
Current - Output (Typ)	20mA	Typical output drive
Current - Quiescent (Max)	2mA	Supply current
CMRR, PSRR (Typ)	70dB CMRR, 60dB PSRR	Signal rejection
Propagation Delay (Max)	1.3µs	Typical response time
Hysteresis	10mV	Built-in hysteresis
Operating Temperature	-55°C ~ 125°C	Full industrial range
Package / Case	14-CFlatPack	Surface mount
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Storage conditions

Substitute Part Grouping Explanation

Substitution logic for the LM139AW-QMLV is based on the following critical parameters:

Functional Equivalence Requirements:

Quad comparator topology (4 independent comparators per package)
General-purpose comparator classification
Open-collector or open-drain output capability
Supply voltage range compatibility with 5V ~ 30V single supply operation

Electrical Compatibility Criteria:

Input offset voltage ≤ 7mV (allows tolerance variation across temperature and supply conditions)
Input bias current ≤ 0.25µA (acceptable for general-purpose applications)
Output current capability ≥ 16mA (sufficient for standard logic interface)
Quiescent current ≤ 2.5mA (low-power operation maintained)
Operating temperature range includes -55°C to 125°C or subset thereof

Package Compatibility:

Surface-mount packages only (14-SOIC, 14-TSSOP, 14-SO variants)
Pin-compatible or functionally equivalent pinout
ROHS3 compliance maintained

Acceptable Substitutes by Category:

Category A - Direct Functional Equivalents (14-SOIC Package): LM139ADT, LM139DT, LM339D, LM339DT, LM2901DT

Category B - Extended Supply Range (14-SOIC Package): LM2901HYDT (automotive-qualified, ±1V ~ 18V supply range)

Category C - Automotive Grade (14-SOIC Package): LM2901YDT (AEC-Q100 qualified, -40°C ~ 125°C)

Category D - Compact Package Alternative (14-TSSOP): LM239PT (reduced footprint, -40°C ~ 105°C operating range)

Category E - Extended Feature Set (24-SOIC Package): MAX516ACWG+, MAX516BCWG+ (additional functionality, different pinout)

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage Range	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Output Type
LM139AW-QMLV	Texas Instruments	14-CFlatPack	5V~30V, ±2.5V~15V	2mV @ 30V	1000pA @ 5V	20mA	2mA	-55°C ~ 125°C	Open-Collector, Open-Drain
LM139ADT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Open-Collector, Open-Drain
LM139DT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Open-Collector, Open-Drain
LM239PT	STMicroelectronics	14-TSSOP	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901DT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901HYDT	STMicroelectronics	14-SOIC	2V~36V, ±1V~18V	Not specified	Not specified	Not specified	2.5mA	Not specified	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901YDT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM339D	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM339DT	STMicroelectronics	14-SOIC	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
MAX516ACWG+	Analog Devices Inc./Maxim Integrated	24-SOIC	4.75V~16.5V	Not specified	0.3µA @ 16.5V	Not specified	10mA	0°C ~ 70°C	CMOS, TTL
MAX516BCWG+	Analog Devices Inc./Maxim Integrated	24-SOIC	4.75V~16.5V	Not specified	0.3µA @ 16.5V	Not specified	10mA	0°C ~ 70°C	CMOS, TTL

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

LM139ADT and LM139DT are the closest functional equivalents to the LM139AW-QMLV. Both maintain quad comparator topology, open-collector output capability, and full -55°C ~ 125°C operating temperature range. LM139ADT offers superior input bias current specification (0.1µA vs. 1000pA), while LM139DT provides higher inventory availability (18,338 units). Both are ROHS3 compliant with MSL 1 rating. The transition from 14-CFlatPack to 14-SOIC package requires PCB layout modification but maintains electrical compatibility across the specified supply voltage range.

Secondary Substitutes (Extended Supply Range Applications):

LM2901HYDT is qualified to automotive AEC-Q100 standards with extended supply voltage range (2V~36V, ±1V~18V). This part is suitable for applications requiring higher supply voltage tolerance or automotive-grade reliability. MSL 3 rating requires controlled moisture exposure during storage. Quiescent current increases to 2.5mA maximum.

Tertiary Substitutes (Compact Packaging):

LM239PT in 14-TSSOP package reduces board footprint by approximately 30% compared to 14-SOIC variants. Operating temperature range is restricted to -40°C ~ 105°C, making this suitable for commercial and industrial applications excluding extended low-temperature operation. Electrical specifications remain compatible with the main part.

Limited Substitutes (Restricted Application):

LM339D and LM339DT operate within 0°C ~ 70°C temperature range only, eliminating suitability for applications requiring -55°C operation. These parts are acceptable for commercial-grade designs with reduced temperature requirements.

MAX516ACWG+ and MAX516BCWG+ feature different pinout (24-SOIC vs. 14-pin) and restricted supply voltage range (4.75V~16.5V). These parts are not direct substitutes and require complete circuit redesign. Higher quiescent current (10mA) makes them unsuitable for low-power applications.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity levels range from MSL 1 (unlimited storage) to MSL 3 (168-hour storage limit). Verify MSL requirements against manufacturing process capabilities before final selection.

Frequently Asked Questions (FAQ)

Q1: Can LM139ADT directly replace LM139AW-QMLV without circuit modification?

A: LM139ADT provides electrical equivalence and maintains all critical performance parameters. However, package geometry differs (14-SOIC vs. 14-CFlatPack). PCB footprint and land pattern must be redesigned. Electrical connections remain identical. No circuit topology changes are required.

Q2: What is the primary difference between LM139DT and LM139ADT?

A: Both are 14-SOIC quad comparators with identical supply voltage ranges and operating temperature. LM139ADT specifies lower input bias current (0.1µA vs. 0.25µA). LM139DT offers significantly higher inventory (18,338 units vs. 4,825 units). Input offset voltage specification differs slightly (2mV vs. 5mV @ 30V). Selection depends on availability requirements and bias current sensitivity.

Q3: Is LM239PT suitable for -55°C operation?

A: No. LM239PT operating temperature range is -40°C ~ 105°C. Applications requiring -55°C minimum temperature must use LM139ADT, LM139DT, LM139AW-QMLV, or LM2901DT. LM239PT is restricted to commercial and industrial temperature ranges.

Q4: What are the implications of switching from 14-CFlatPack to 14-SOIC package?

A: Package footprint increases from CFlatPack to SOIC geometry. PCB land pattern, solder reflow profile, and pick-and-place programming require modification. Electrical performance remains unchanged. Lead spacing and component height differ. Verify PCB design rules and assembly equipment compatibility before implementation.

Q5: Can LM2901HYDT be used in non-automotive applications?

A: Yes. LM2901HYDT automotive qualification (AEC-Q100) exceeds commercial-grade requirements. Extended supply voltage range (2V~36V, ±1V~18V) provides additional design margin. MSL 3 rating requires controlled moisture exposure (168-hour maximum). Suitable for industrial and commercial applications with enhanced reliability requirements.

Q6: Why do MAX516 parts have different pinout than LM139 series?

A: MAX516 is a 24-pin device with additional integrated functionality beyond basic quad comparator operation. Pin count and arrangement differ fundamentally. MAX516 parts are not pin-compatible substitutes and require complete schematic and PCB redesign. Supply voltage range is also restricted (4.75V~16.5V vs. 5V~30V).

Q7: What inventory considerations apply to substitute selection?

A: LM339DT maintains highest inventory (445,200 units) among 14-SOIC alternatives. LM2901DT provides 185,200 units. LM139ADT and LM139DT offer 4,825 and 18,338 units respectively. LM2901HYDT (automotive) has limited availability (4,310 units). Verify supplier stock levels and lead times for production scheduling.

Q8: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance. Environmental compliance status is consistent across the product family. Moisture sensitivity levels vary (MSL 1 for most parts, MSL 3 for automotive-qualified variants). Verify MSL requirements against manufacturing process specifications.

Q9: How does quiescent current affect power consumption in battery-powered applications?

A: LM139AW-QMLV specifies 2mA maximum quiescent current. LM2901 variants increase to 2.5mA. For quad comparator operation, total supply current ranges from 8mA to 10mA under no-signal conditions. In low-power applications, this represents significant power draw. Verify total system power budget before substitution.

Q10: What is the significance of input offset voltage specification differences?

A: LM139AW-QMLV specifies 2mV maximum input offset at 30V. Substitute parts range from 2mV to 7mV depending on supply voltage and temperature. Higher offset voltage reduces precision in threshold detection applications. For general-purpose comparator use, 5mV offset is acceptable. Precision applications requiring <3mV offset should prioritize LM139ADT or LM139AW-QMLV.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message