LM239DG4 Equivalent & Substitute Parts

Part Overview

The LM239DG4 is a general-purpose quad comparator IC manufactured by Texas Instruments in 14-SOIC surface-mount packaging. This device features open-collector outputs and operates across a wide supply voltage range of 2V to 30V (single supply) or ±1V to ±15V (dual supply). The LM239DG4 is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM239DG4
Manufacturer	Texas Instruments
Category	Linear Comparator
Number of Elements	4
Output Type	Open-Collector
Voltage Supply (Single/Dual)	2V ~ 30V / ±1V ~ 15V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2mA
Operating Temperature	-25°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM239DG4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Number of comparator elements: 4
Output type: Open-Collector (primary requirement)
Supply voltage range: Minimum 2V ~ 30V single supply or ±1V ~ ±15V dual supply
Input offset voltage: Maximum 5mV @ 30V
Input bias current: Maximum 0.25µA @ 5V
Output current capability: Minimum 16mA typical
Quiescent current: Maximum 2.5mA

Mechanical Compatibility Requirements:

Package type: 14-SOIC or equivalent 14-pin surface-mount package
Package width: 0.154" to 0.173" (3.90mm to 4.40mm)
Mounting type: Surface Mount

Compliance Requirements:

RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts must meet all electrical parameters within the specified tolerances and maintain mechanical compatibility with the original 14-SOIC footprint. Parts with extended temperature ranges or improved specifications are acceptable provided they do not exceed the original supply voltage limits.

Parameter Comparison

Part Number	Manufacturer	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Status
LM239DG4	Texas Instruments	Open-Collector	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC	Last Time Buy
LM239D	STMicroelectronics	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DR	Texas Instruments	Open-Collector	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC	Active
LM139AD	Texas Instruments	Open-Collector, Open-Drain	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
BA2901SF-E2	Rohm Semiconductor	Open-Collector	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Active
LM139ADT	STMicroelectronics	Open-Collector	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	Open-Collector	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM239ADT	STMicroelectronics	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DR2G	onsemi	Open-Collector, CMOS, TTL	3V~36V / ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	14-SOIC	Active
LM239DT	STMicroelectronics	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM2901DT	STMicroelectronics	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2V~32V / ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

LM239DR (Texas Instruments) is the direct equivalent to LM239DG4, offering identical electrical specifications and operating temperature range. Both devices are manufactured by Texas Instruments with matching supply voltage limits, input offset voltage, and output current ratings. LM239DR is in Active status, providing long-term availability.

Primary Substitutes (Active Status, Equivalent Performance):

LM239DT (STMicroelectronics) and LM239D (STMicroelectronics) provide equivalent electrical performance with extended operating temperature range (-40°C to 105°C). These parts maintain the same input offset voltage (5mV @ 30V) and input bias current specifications. The extended temperature range offers improved reliability in wider environmental conditions while maintaining backward compatibility.

LM239ADT (STMicroelectronics) offers improved input offset voltage (2mV @ 30V) and reduced input bias current (0.1µA @ 5V) compared to the original specification, with extended temperature range (-40°C to 105°C). This part is suitable for applications requiring tighter input specifications.

Alternative Substitutes (Extended Supply Voltage Range):

LM239DR2G (onsemi) extends the supply voltage range to 3V~36V (±1.5V~18V) while maintaining open-collector output compatibility. This part is suitable for applications requiring higher supply voltage capability.

BA2901SF-E2 (Rohm Semiconductor) provides the widest supply voltage range (2V~36V / ±1V~18V) with open-collector output. Package width is 0.173" (4.40mm), which remains compatible with standard 14-SOIC footprints.

Enhanced Specifications (Improved Performance):

LM139AD and LM139ADT (Texas Instruments and STMicroelectronics respectively) offer superior input specifications with 2mV maximum input offset voltage and 0.1µA maximum input bias current. LM139ADT provides extended temperature range (-55°C to 125°C) for demanding applications.

LM2901DT (STMicroelectronics) extends the operating temperature range to -40°C to 125°C, providing the widest temperature coverage among available substitutes.

All substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring regulatory and environmental compatibility with the original LM239DG4.

Frequently Asked Questions (FAQ)

Q: Can I use LM239DR as a direct replacement for LM239DG4?

A: Yes. LM239DR is manufactured by Texas Instruments with identical electrical specifications, supply voltage range, input offset voltage, output current rating, and operating temperature range. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube), which does not affect electrical performance or PCB compatibility.

Q: What is the difference between LM239 and LM139 series comparators?

A: The LM139 series offers improved input specifications with lower input offset voltage (2mV maximum vs. 5mV) and lower input bias current (0.1µA maximum vs. 0.25µA). LM139 devices also support extended operating temperature ranges. Both series maintain the same quad comparator architecture and 14-SOIC package compatibility.

Q: Are STMicroelectronics LM239 parts compatible with Texas Instruments LM239DG4?

A: Yes. STMicroelectronics LM239DT and LM239D maintain electrical compatibility with the original LM239DG4 specification. STMicroelectronics parts offer extended operating temperature range (-40°C to 105°C) compared to the original (-25°C to 85°C), providing improved reliability without sacrificing backward compatibility.

Q: What does "Last Time Buy" status mean for the LM239DG4?

A: Last Time Buy indicates that Texas Instruments has discontinued the LM239DG4 and will no longer manufacture this part after existing inventory is depleted. Active substitute parts such as LM239DR, LM239DT, and LM239ADT ensure continued design support and procurement availability.

Q: Can I use parts with higher supply voltage ratings as substitutes?

A: Yes, provided the minimum supply voltage requirement remains at 2V. Parts such as LM239DR2G (3V~36V) and BA2901SF-E2 (2V~36V) can be used in applications originally designed for 2V~30V operation. However, verify that your circuit design does not depend on the original 30V maximum rating.

Q: Are there package compatibility considerations between 14-SOIC and 14-SOP?

A: 14-SOIC and 14-SOP packages are mechanically compatible on standard PCB footprints. Both maintain 0.154" to 0.173" width specifications. BA2901SF-E2 uses 14-SOP packaging (0.173" width) and is compatible with standard 14-SOIC footprints.

Q: Which substitute offers the best input offset voltage specification?

A: LM139AD and LM139ADT offer the lowest input offset voltage at 2mV maximum @ 30V, compared to 5mV for the original LM239DG4. These parts are suitable for precision measurement applications requiring tighter input specifications.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL rating of 1 (Unlimited), matching the environmental and regulatory compliance of the original LM239DG4.

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