LM139AWG-SMD Equivalent & Substitute Parts

Part Overview

The LM139AWG-SMD is a low-power, low-offset voltage general-purpose comparator manufactured by Texas Instruments in a 14-CSOIC surface-mount package. This quad comparator features open-collector/open-drain outputs and operates across a wide supply voltage range of 5V to 30V (single supply) or ±2.5V to ±15V (dual supply). The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the original LM139AWG-SMD is unavailable, when alternative packaging formats are required for manufacturing processes, or when design flexibility demands different thermal or electrical performance characteristics within the same functional class.

Key Parameters

Parameter	Value	Specification
Manufacturer	Texas Instruments	Primary source
Part Number	LM139AWG-SMD	14-CSOIC surface mount
Number of Elements	4	Quad comparator configuration
Output Type	Open-Collector, Open-Drain	Logic-compatible output stage
Supply Voltage Range	5V ~ 30V (single), ±2.5V ~ ±15V (dual)	Operating range
Input Offset Voltage (Max)	2mV @ 30V	Precision specification
Input Bias Current (Max)	1000pA @ 5V	Input loading
Output Current (Typ)	20mA	Sink capability
Quiescent Current (Max)	2mA	Power consumption
CMRR / PSRR (Typ)	70dB / 70dB	Noise rejection
Propagation Delay (Max)	1.3µs (Typ)	Response time
Hysteresis	10mV	Switching threshold
Operating Temperature	-55°C ~ 125°C	Industrial range
Package / Case	14-CSOIC (0.250", 6.35mm Width)	Surface mount
RoHS Status	ROHS3 Compliant	Environmental compliance
MSL Rating	1 (Unlimited)	Moisture sensitivity

Substitute Part Grouping Explanation

Substitution of the LM139AWG-SMD is determined by the following critical parameters:

Functional Equivalence Criteria:

Number of Elements: Must be 4 (quad configuration)
Type: General Purpose comparator
Output Type: Open-Collector, Open-Drain capability
Supply Voltage Range: Must encompass or exceed 5V ~ 30V single supply range
Input Offset Voltage: Maximum 5mV @ 30V acceptable
Input Bias Current: Maximum 0.25µA @ 5V acceptable
Output Current: Minimum 16mA typical acceptable
Quiescent Current: Maximum 2.5mA acceptable
Operating Temperature: Must support -55°C ~ 125°C or subset thereof
RoHS Status: ROHS3 Compliant required

Package Compatibility: Substitutes are grouped by mounting type (surface mount vs. through-hole) and physical dimensions. Surface-mount alternatives include 14-SOIC, 14-TSSOP, and 16-QFN packages. Through-hole alternative is 14-CDIP.

Manufacturer Diversity: Qualified substitutes are sourced from Texas Instruments, STMicroelectronics, and onsemi, all meeting industrial-grade specifications and compliance requirements.

Parameter Comparison

Part Number	Manufacturer	Package Type	Mount Type	Supply Voltage (Single)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	RoHS
LM139AWG-SMD	Texas Instruments	14-CSOIC	Surface Mount	5V ~ 30V	2mV @ 30V	1000pA @ 5V	20mA	2mA	-55°C ~ 125°C	ROHS3
LM139J/PB	Texas Instruments	14-CDIP	Through Hole	2V ~ 36V	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	ROHS3
LM139ADT	STMicroelectronics	14-SOIC	Surface Mount	2V ~ 32V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	ROHS3
LM139DT	STMicroelectronics	14-SOIC	Surface Mount	2V ~ 32V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	ROHS3
LM239QT	STMicroelectronics	16-QFN (3x3)	Surface Mount	2V ~ 36V	5mV	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	ROHS3
LM2901VDTBR2G	onsemi	14-TSSOP	Surface Mount	3V ~ 36V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2901YDT	STMicroelectronics	14-SOIC	Surface Mount	2V ~ 32V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2901YPT	STMicroelectronics	14-TSSOP	Surface Mount	2V ~ 32V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM339APT	STMicroelectronics	14-TSSOP	Surface Mount	2V ~ 32V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
LM339DT	STMicroelectronics	14-SOIC	Surface Mount	2V ~ 32V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
LM339EDR2G	onsemi	14-SOIC	Surface Mount	3V ~ 36V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	0°C ~ 70°C	ROHS3

Engineering Selection Recommendations

Primary Surface-Mount Substitutes (Recommended for Direct Replacement):

LM139ADT and LM139DT are the closest functional equivalents to LM139AWG-SMD. Both are STMicroelectronics products in 14-SOIC surface-mount packages with matching quad comparator configuration, open-collector output capability, and full industrial temperature range (-55°C ~ 125°C). LM139ADT matches the input offset voltage specification (2mV @ 30V) and input bias current (0.1µA @ 5V) of the original part. Both maintain 2mA quiescent current and support the required supply voltage range. All three parts carry ROHS3 compliance and MSL 1 rating.

Alternative Surface-Mount Options:

LM339APT and LM339DT provide functional equivalence with different package formats (14-TSSOP and 14-SOIC respectively). These parts operate within the required supply voltage range and maintain comparable electrical performance. However, LM339APT and LM339DT are rated for 0°C ~ 70°C operating temperature, which is a subset of the original -55°C ~ 125°C range. These are suitable for applications not requiring the full industrial temperature specification.

LM2901VDTBR2G (onsemi, 14-TSSOP) and LM2901YPT (STMicroelectronics, 14-TSSOP) offer compact packaging with extended supply voltage range (3V ~ 36V and 2V ~ 32V respectively). Input offset voltage is 7mV @ 5V, which exceeds the original 2mV specification but remains within acceptable limits for general-purpose comparator applications.

Through-Hole Alternative:

LM139J/PB is a Texas Instruments product in 14-CDIP through-hole package. It maintains the same manufacturer as the original part and supports the full industrial temperature range (-55°C ~ 125°C). This option is suitable for applications requiring through-hole mounting or legacy PCB designs. Supply voltage range extends to 2V ~ 36V, exceeding the original specification.

Compact Package Option:

LM239QT (STMicroelectronics, 16-QFN 3x3) provides the smallest footprint among substitutes. Operating temperature range is -40°C ~ 105°C, which does not cover the full -55°C specification of the original part. This option is suitable for space-constrained applications within the specified temperature range.

Product Status and Compliance:

All substitute parts carry Active product status and ROHS3 compliance. STMicroelectronics and onsemi parts include REACH Unaffected designation. LM2901YDT and LM2901YPT carry AEC-Q100 automotive qualification, suitable for automotive-grade applications.

Frequently Asked Questions (FAQ)

Q: Can LM139ADT directly replace LM139AWG-SMD in existing designs?

A: LM139ADT is functionally equivalent for most applications. Both are quad comparators with open-collector outputs, matching input offset voltage (2mV @ 30V), and identical quiescent current (2mA). The primary difference is package format: LM139ADT uses 14-SOIC (0.154" width) versus LM139AWG-SMD in 14-CSOIC (0.250" width). PCB layout modifications are required due to different pin spacing. Both support -55°C ~ 125°C operating range and carry ROHS3 compliance.

Q: What is the difference between LM139 and LM339 series substitutes?

A: Both LM139 and LM339 are quad general-purpose comparators with open-collector outputs. The primary distinction is output type specification: LM139 series specifies Open-Collector/Open-Drain outputs, while LM339 series lists expanded output types including CMOS, DTL, ECL, MOS, Open-Collector, and TTL. Electrically, both families operate within comparable supply voltage ranges and temperature specifications. LM339 variants are available in multiple package formats (14-SOIC, 14-TSSOP) with varying temperature ratings (0°C ~ 70°C for standard grades).

Q: Are LM2901 series parts compatible substitutes?

A: LM2901 series comparators are functionally compatible for general-purpose applications. LM2901VDTBR2G and LM2901YPT maintain quad configuration with open-collector output capability. Supply voltage range extends to 3V ~ 36V (onsemi) or 2V ~ 32V (STMicroelectronics), exceeding the original 5V ~ 30V specification. Input offset voltage is 7mV @ 5V, which is higher than the original 2mV @ 30V specification. Operating temperature for LM2901YDT and LM2901YPT is -40°C ~ 125°C, which does not cover the full -55°C lower limit. LM2901YPT carries AEC-Q100 automotive qualification.

Q: What are the package format implications for substitution?

A: Package format determines PCB layout compatibility and manufacturing process requirements. LM139AWG-SMD uses 14-CSOIC (0.250" width) surface mount. Direct surface-mount substitutes include 14-SOIC (0.154" width, narrower pitch), 14-TSSOP (0.173" width, smaller footprint), and 16-QFN (3x3mm, compact). Through-hole alternative LM139J/PB uses 14-CDIP format. Pin count remains 14 for SOIC, TSSOP, and CDIP packages; LM239QT uses 16-pin QFN. PCB redesign is necessary when changing package families.

Q: Which substitute offers the best thermal performance?

A: LM239QT in 16-QFN (3x3) package provides the smallest thermal footprint due to compact dimensions and exposed pad design. However, operating temperature range is -40°C ~ 105°C, which does not extend to the original -55°C lower limit. For full industrial temperature range (-55°C ~ 125°C) with improved thermal characteristics, LM139ADT and LM139DT in 14-SOIC packages are recommended. LM2901YPT in 14-TSSOP offers a balance between compact size and thermal performance within -40°C ~ 125°C range.

Q: Are there supply voltage range limitations with substitutes?

A: The original LM139AWG-SMD operates at 5V ~ 30V (single supply) or ±2.5V ~ ±15V (dual supply). Most substitutes extend the lower supply voltage limit to 2V or 3V, which is advantageous for low-power applications. LM139J/PB extends upper limit to 36V. All substitutes maintain compatibility with the original 5V ~ 30V range. For applications requiring operation below 5V, LM139J/PB, LM139ADT, LM139DT, LM2901YDT, and LM2901YPT support 2V minimum. LM2901VDTBR2G and LM339EDR2G support 3V minimum.

Q: What is the impact of input offset voltage differences?

A: The original LM139AWG-SMD specifies 2mV maximum input offset voltage @ 30V. Substitutes with matching specification (2mV @ 30V) are LM139ADT and LM339APT. Substitutes with 5mV specification (LM139J/PB, LM139DT, LM239QT, LM339DT, LM339EDR2G) are acceptable for applications with input signal levels significantly above 5mV. Substitutes with 7mV specification (LM2901VDTBR2G, LM2901YDT, LM2901YPT) are suitable for general-purpose comparator applications where precision offset is not critical. Higher offset voltage reduces accuracy in precision measurement circuits.

Q: Which substitutes are suitable for automotive applications?

A: LM2901YDT and LM2901YPT carry AEC-Q100 automotive qualification and Grade designation. Both are STMicroelectronics products with REACH Unaffected status. LM2901YDT operates in 14-SOIC package; LM2901YPT uses 14-TSSOP package. Both support -40°C ~ 125°C operating range and maintain 2.5mA quiescent current. These parts are qualified for automotive-grade reliability and environmental stress testing requirements.

Q: What is the inventory availability consideration?

A: LM339DT (STMicroelectronics, 14-SOIC) has the highest inventory availability at 445,200 pieces. LM2901YPT (STMicroelectronics, 14-TSSOP) has 55,300 pieces available. LM139DT has 18,338 pieces. LM139ADT has 4,825 pieces. LM2901VDTBR2G has 5,380 pieces. LM339EDR2G has 5,100 pieces. LM139J/PB has 3,100 pieces. LM239QT has 2,938 pieces. LM2901YDT has 2,695 pieces. LM339APT has 16,250 pieces. Original LM139AWG-SMD has 756 pieces in stock. High-volume applications should prioritize LM339DT or LM2901YPT for supply chain reliability.

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