LM139DRG4 Equivalent & Substitute Parts

Part Overview

The LM139DRG4 is a general-purpose comparator IC with four differential inputs and open-collector/open-drain outputs, manufactured by Texas Instruments in a 14-SOIC surface-mount package. This device is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The LM139DRG4 operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is suitable for precision voltage comparison circuits in industrial and consumer applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM139DRG4
Manufacturer	Texas Instruments
Category	Linear Comparator
Number of Elements	4
Output Type	Open-Collector, Open-Drain
Voltage Supply Range (Single/Dual)	2V ~ 30V / ±1V ~ ±15V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.1µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2mA
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the LM139DRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Number of comparator elements: 4
Output type: Open-Collector or Open-Drain capability
Package type: 14-SOIC or equivalent 14-pin surface-mount package
Supply voltage range: Minimum 2V to 30V single supply (or ±1V to ±15V dual supply)
Input offset voltage: Maximum 5mV or better
Input bias current: Maximum 0.1µA or better
Output current capability: Minimum 16mA typical
Quiescent current: Maximum 2.5mA
Operating temperature range: Minimum -40°C to 105°C (extended range -55°C to 125°C preferred)
RoHS3 compliance and MSL rating

Substitution Groups:

Group 1 - Direct Texas Instruments Replacements (Same Base Product LM139): LM139DR, LM139AD, LM139ADT, LM139DT meet all primary criteria with identical or superior electrical specifications and packaging.

Group 2 - STMicroelectronics LM139/LM239 Series: LM139ADT, LM139DT, LM239ADT, LM239DT provide equivalent functionality with compatible supply ranges and output characteristics.

Group 3 - STMicroelectronics LM2901 Series: LM2901DT, LM2901HYDT, LM2901YDT offer extended supply voltage range (2V to 32V or 36V) and are functionally compatible.

Group 4 - Alternative Manufacturer (Rohm Semiconductor): BA2901SF-E2 provides equivalent comparator functionality with slightly extended supply range (2V to 36V) but operates at reduced temperature range (-40°C to 105°C).

Parameter Comparison

Part Number	Manufacturer	Supply Voltage (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Product Status
LM139DRG4	Texas Instruments	2V~30V / ±1V~±15V	5mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Discontinued
LM139DR	Texas Instruments	2V~30V / ±1V~±15V	5mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139AD	Texas Instruments	2V~30V / ±1V~±15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
LM139ADT	STMicroelectronics	2V~32V / ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	2V~32V / ±1V~±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM239ADT	STMicroelectronics	2V~32V / ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DT	STMicroelectronics	2V~32V / ±1V~±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM2901DT	STMicroelectronics	2V~32V / ±1V~±16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Active
LM2901HYDT	STMicroelectronics	2V~36V / ±1V~±18V	—	—	—	2.5mA	—	14-SOIC	Active (Automotive)
LM2901YDT	STMicroelectronics	2V~32V / ±1V~±16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Active (Automotive)
BA2901SF-E2	Rohm Semiconductor	2V~36V / ±1V~±18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Active

Engineering Selection Recommendations

Preferred Primary Substitutes:

LM139DR (Texas Instruments) is the direct active replacement for LM139DRG4, maintaining identical electrical specifications, supply voltage range, and operating temperature range. This part is currently in active production status with high inventory availability (18,248 units).

LM139ADT (STMicroelectronics) provides superior input offset voltage performance (2mV vs. 5mV) while maintaining all other critical parameters. This part is actively produced and suitable for applications requiring tighter offset specifications.

Secondary Substitutes for Extended Supply Range:

LM2901DT and LM2901YDT (STMicroelectronics) extend the supply voltage capability to 2V–32V single supply and maintain full compatibility with the LM139DRG4 functional requirements. The LM2901YDT variant includes automotive-grade qualification (AEC-Q100) for applications requiring automotive reliability standards.

LM2901HYDT (STMicroelectronics) offers the widest supply voltage range (2V–36V single supply, ±1V–±18V dual supply) with automotive qualification, suitable for applications requiring extended voltage operation in automotive environments.

Alternative Manufacturer Option:

BA2901SF-E2 (Rohm Semiconductor) provides equivalent four-element comparator functionality with extended supply range (2V–36V). This part operates at a reduced temperature range (-40°C to 105°C) compared to the original LM139DRG4 (-55°C to 125°C), making it suitable for standard industrial applications but not for extended low-temperature environments.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and MSL rating 1 (unlimited moisture sensitivity), ensuring compatibility with modern manufacturing and storage requirements. Automotive-qualified variants (LM2901HYDT, LM2901YDT) carry AEC-Q100 qualification for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can LM139DR be used as a direct replacement for LM139DRG4?

A: Yes. LM139DR is the active production equivalent of LM139DRG4, manufactured by Texas Instruments with identical electrical specifications, supply voltage range (2V–30V single, ±1V–±15V dual), operating temperature range (-55°C to 125°C), and 14-SOIC packaging. The only difference is product status: LM139DRG4 is discontinued while LM139DR is actively produced.

Q: What is the difference between LM139 and LM2901 series comparators?

A: Both are four-element general-purpose comparators with compatible pinouts and 14-SOIC packaging. The LM2901 series offers extended supply voltage range (up to 36V in some variants) and is available in automotive-qualified grades. The LM139 series maintains the original specification with supply range up to 30V. Functionally, both are interchangeable for standard applications within their respective voltage ratings.

Q: Can I use LM239DT instead of LM139DRG4?

A: LM239DT is functionally compatible but operates at a reduced temperature range (-40°C to 105°C vs. -55°C to 125°C). Use LM239DT only if your application does not require operation below -40°C or above 105°C. All other electrical parameters are compatible.

Q: What is the difference between 14-SOIC and 14-SOP packaging?

A: Both are 14-pin surface-mount packages with identical pin spacing and electrical compatibility. The primary difference is physical dimensions: 14-SOIC has a width of 0.154" (3.90mm), while 14-SOP has a width of 0.173" (4.40mm). For PCB layout compatibility, verify your design accommodates the specific package width. BA2901SF-E2 uses 14-SOP packaging and may require PCB layout adjustment.

Q: Are automotive-qualified variants (LM2901HYDT, LM2901YDT) suitable for non-automotive applications?

A: Yes. Automotive-qualified parts meet or exceed standard industrial specifications and carry AEC-Q100 certification. These variants are fully compatible with non-automotive applications and offer the same functional performance as standard industrial grades.

Q: What is the minimum supply voltage for all substitute parts?

A: All substitute parts operate at a minimum of 2V single supply (or ±1V dual supply), matching the LM139DRG4 specification. This ensures compatibility with low-voltage battery-powered and portable applications.

Q: Can I substitute BA2901SF-E2 (Rohm) for LM139DRG4 (Texas Instruments)?

A: BA2901SF-E2 is functionally equivalent with compatible electrical specifications and extended supply range (2V–36V). However, it operates at a reduced temperature range (-40°C to 105°C) and uses 14-SOP packaging instead of 14-SOIC. Verify your PCB layout accommodates the wider 14-SOP package before substitution.

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