LM139ADG4 Equivalent & Substitute Parts

Part Overview

The LM139ADG4 is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent differential comparators in a 14-SOIC surface-mount package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and production continuity. The LM139ADG4 operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is suitable for applications requiring open-collector or open-drain output configurations. Due to its obsolete status, equivalent parts with active product status are required for ongoing component sourcing and design updates.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM139ADG4
Category	Linear - Comparator
Type	General Purpose
Number of Elements	4
Output Type	Open-Collector, Open-Drain
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V
Voltage - Input Offset (Max)	2mV @ 30V
Current - Input Bias (Max)	0.1µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2mA
Operating Temperature	-55°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM139ADG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Number of comparator elements: 4 independent comparators
Output configuration: Open-Collector or Open-Drain capability
Package type: 14-SOIC surface-mount form factor
Supply voltage range: Minimum 2V to 30V single supply compatibility
Input offset voltage: Maximum 2mV to 7mV @ specified voltage
Input bias current: Maximum 0.1µA to 0.25µA @ 5V
Output current capability: Minimum 16mA typical
Operating temperature range: -55°C to 125°C or -40°C to 105°C
RoHS3 compliance and MSL rating

Substitute Categories:

Direct Texas Instruments Equivalents (Same Base Product): LM139AD, LM139ADR, LM139ADT - These maintain identical electrical specifications and packaging within the LM139 product line.
STMicroelectronics LM139 Series: LM139ADT, LM139DT - Pin-compatible alternatives with equivalent performance characteristics.
STMicroelectronics LM239 Series: LM239ADT, LM239DT - Extended supply voltage range (2V ~ 32V) with compatible output types and element count.
STMicroelectronics LM2901 Series: LM2901DT, LM2901HYDT, LM2901YDT - Enhanced supply voltage capability (2V ~ 32V or 2V ~ 36V) with automotive-grade variants available.
Rohm Semiconductor Alternative: BA2901SF-E2 - Extended supply voltage range (2V ~ 36V) with slightly different electrical characteristics but compatible package and element count.

Parameter Comparison

Part Number	Manufacturer	Product Status	Number of Elements	Output Type	Supply Voltage (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Packaging Type
LM139ADG4	Texas Instruments	Obsolete	4	Open-Collector, Open-Drain	2V ~ 30V, ±1V ~ 15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Tube
LM139AD	Texas Instruments	Last Time Buy	4	Open-Collector, Open-Drain	2V ~ 30V, ±1V ~ 15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Tube
LM139ADR	Texas Instruments	Active	4	Open-Collector, Open-Drain	2V ~ 30V, ±1V ~ 15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel
LM139ADT	STMicroelectronics	Active	4	Open-Collector, Open-Drain	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Tape & Reel
LM139DT	STMicroelectronics	Active	4	Open-Collector, Open-Drain	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel
LM239ADT	STMicroelectronics	Active	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Cut Tape & Digi-Reel
LM239DT	STMicroelectronics	Active	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Cut Tape & Digi-Reel
LM2901DT	STMicroelectronics	Active	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel
LM2901HYDT	STMicroelectronics	Active	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	Not specified	Not specified	Not specified	2.5mA	Not specified	14-SOIC	Tape & Reel
LM2901YDT	STMicroelectronics	Active	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 32V, ±1V ~ 16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel
BA2901SF-E2	Rohm Semiconductor	Active	4	Open-Collector	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Tape & Reel

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility):

LM139ADR is the primary recommended substitute. This Texas Instruments part maintains identical electrical specifications to the LM139ADG4 while offering active product status and improved availability through Cut Tape and Digi-Reel packaging. It provides the same supply voltage range, input offset voltage, and operating temperature specifications. RoHS3 compliance and MSL 1 rating are maintained.

Tier 2 - Pin-Compatible Alternatives (Active Status):

LM139ADT (STMicroelectronics) and LM139DT (STMicroelectronics) are functionally equivalent with extended supply voltage capability (2V ~ 32V versus 2V ~ 30V). Both maintain the 14-SOIC package and open-collector output configuration. LM139ADT preserves the 2mV input offset specification, while LM139DT exhibits 5mV offset. Both are actively produced with established supply chains.

Tier 3 - Extended Capability Alternatives:

LM239ADT and LM239DT offer extended operating temperature range (-40°C to 105°C) and enhanced output type flexibility. These are suitable for applications not requiring the full -55°C lower temperature limit. LM2901DT and LM2901YDT extend the upper operating temperature to 125°C and provide the widest supply voltage compatibility (2V ~ 32V). LM2901HYDT is an automotive-grade variant (AEC-Q100 qualified) with extended supply range (2V ~ 36V), suitable for automotive and harsh-environment applications.

Tier 4 - Cross-Manufacturer Alternative:

BA2901SF-E2 (Rohm Semiconductor) provides the widest supply voltage range (2V ~ 36V) and is actively produced. The 14-SOP package is mechanically compatible with 14-SOIC footprints. Input offset voltage is 7mV, and output current is 16mA. This option is suitable when supply chain diversification is required.

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and MSL 1 or MSL 3 ratings. Automotive-grade variants (LM2901HYDT, LM2901YDT) carry AEC-Q100 qualification for applications requiring automotive reliability standards.

Frequently Asked Questions (FAQ)

Q: Can LM139ADR directly replace LM139ADG4 in existing designs?

A: Yes. LM139ADR is a direct functional equivalent with identical electrical specifications, package type (14-SOIC), and operating characteristics. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance. No design modifications are required.

Q: What is the difference between LM139ADT and LM139DT?

A: Both are STMicroelectronics LM139 variants in 14-SOIC packages. LM139ADT maintains the 2mV input offset voltage specification matching the original LM139ADG4. LM139DT has a 5mV input offset and accepts higher input bias current (0.25µA versus 0.1µA). LM139ADT is preferred for applications requiring tighter input offset specifications.

Q: Are LM239 and LM2901 series compatible with LM139 designs?

A: Yes, with considerations. All three series share the same 14-SOIC package, four-element comparator configuration, and open-collector output capability. LM239 and LM2901 parts offer extended supply voltage ranges and different operating temperature specifications. Verify that your application's temperature and voltage requirements align with the selected substitute before implementation.

Q: What is the significance of the LM2901HYDT automotive qualification?

A: LM2901HYDT carries AEC-Q100 automotive qualification, indicating compliance with automotive reliability and quality standards. This variant is suitable for automotive, industrial, and mission-critical applications requiring enhanced reliability assurance. It features extended supply voltage range (2V ~ 36V) and MSL 3 moisture sensitivity rating.

Q: Can BA2901SF-E2 be used as a substitute despite being from a different manufacturer?

A: Yes. BA2901SF-E2 from Rohm Semiconductor is functionally compatible with the LM139ADG4. It provides four independent comparators in a 14-SOP package (mechanically compatible with 14-SOIC footprints), open-collector output, and extended supply voltage range (2V ~ 36V). Input offset voltage is 7mV, which is within acceptable tolerance for most general-purpose comparator applications. Cross-manufacturer substitution is suitable when supply chain diversification is required.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Tube (LM139AD), Cut Tape & Digi-Reel (LM139ADR, LM139DT, LM239ADT, LM239DT, LM2901DT, LM2901YDT), and Tape & Reel (LM139ADT, LM2901HYDT, BA2901SF-E2). Selection depends on production volume and handling requirements. Cut Tape & Digi-Reel packaging is standard for medium-volume production; Tape & Reel is preferred for high-volume automated assembly.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitute parts maintain RoHS3 compliance. Moisture sensitivity levels vary between MSL 1 (unlimited) and MSL 3 (168 hours), which affects storage and handling requirements. Verify MSL compatibility with your manufacturing process before component procurement.

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