LM239DRG3 Equivalent & Substitute Parts

Part Overview

The LM239DRG3 is a general-purpose comparator IC manufactured by Texas Instruments, featuring four differential comparators with open-collector outputs in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is designed for precision voltage comparison applications in industrial and consumer electronics.

The LM239DRG3 carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part number. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently using this comparator.

Key Parameters

Parameter	LM239DRG3 Specification
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

Substitute parts for the LM239DRG3 are classified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Number of Elements: Must be 4 differential comparators
Output Type: Must include Open-Collector capability
Package Type: Must be 14-SOIC or equivalent 14-pin surface-mount package with 0.154" width
Supply Voltage Range: Must support minimum 2V to 30V single supply operation
Input Offset Voltage: Maximum 5mV to 7mV @ specified voltage
Input Bias Current: Maximum 0.25µA to 0.1µA @ 5V
Output Current: Minimum 16mA typical capability
Quiescent Current: Maximum 2.5mA
Operating Temperature: Must support -25°C to 85°C minimum range
Compliance: ROHS3 compliant, MSL 1

Substitution Categories:

Direct Parametric Equivalents maintain identical electrical specifications and package footprint, enabling drop-in replacement without circuit modification.

Manufacturer-Recommended Alternatives offer enhanced specifications (lower offset voltage, improved temperature range, or higher supply voltage capability) while maintaining functional compatibility through the same package and pin configuration.

Cross-Manufacturer Equivalents provide comparable performance from alternative semiconductor manufacturers, suitable for applications where supply diversification is required.

Parameter Comparison

Part Number	Manufacturer	Elements	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Status
LM239DRG3	Texas Instruments	4	Open-Collector	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC	Last Time Buy
LM239DR	Texas Instruments	4	Open-Collector	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC	Active
LM239ADT	STMicroelectronics	4	Open-Collector, TTL, CMOS, DTL, ECL, MOS	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DT	STMicroelectronics	4	Open-Collector, TTL, CMOS, DTL, ECL, MOS	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DR2G	onsemi	4	Open-Collector, TTL, CMOS	3V~36V / ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	14-SOIC	Active
LM139AD	Texas Instruments	4	Open-Collector, Open-Drain	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
LM139ADT	STMicroelectronics	4	Open-Collector, Open-Drain	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	4	Open-Collector, Open-Drain	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM2901DT	STMicroelectronics	4	Open-Collector, TTL, CMOS, DTL, ECL, MOS	2V~32V / ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC	Active
BA2901SF-E2	Rohm Semiconductor	4	Open-Collector	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM293DR	Texas Instruments	2	Open-Collector, Open-Drain, Rail-to-Rail	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Replacement (Same Electrical Specifications):

LM239DR from Texas Instruments is the primary direct replacement for LM239DRG3. Both parts maintain identical electrical parameters, supply voltage range, and package configuration. LM239DR is in Active product status, ensuring long-term availability and supply continuity. This part requires no circuit modification and provides the most straightforward migration path.

Enhanced Performance Alternatives (Active Status):

LM239ADT and LM239DT from STMicroelectronics offer improved specifications including lower input offset voltage (2mV to 5mV) and extended operating temperature range (-40°C to 105°C). Both maintain the 14-SOIC package and open-collector output configuration. These parts are suitable for applications requiring tighter offset specifications or broader temperature operation.

LM239DR2G from onsemi provides extended supply voltage capability (3V to 36V single supply) while maintaining compatibility with the original 14-SOIC footprint and open-collector output. This part is recommended for applications requiring higher supply voltage margins.

Extended Temperature Range Options:

LM139ADT and LM139DT from STMicroelectronics support -55°C to 125°C operating range, suitable for industrial and automotive applications requiring wider temperature specifications. Both maintain 14-SOIC packaging and open-collector output compatibility.

Cross-Manufacturer Alternatives:

BA2901SF-E2 from Rohm Semiconductor provides equivalent functionality with extended supply voltage range (2V to 36V) and active product status. The 14-SOIC package footprint is compatible with existing PCB designs.

LM2901DT from STMicroelectronics offers four-element comparator functionality with extended temperature range (-40°C to 125°C) and active status, suitable for demanding industrial applications.

Packaging Consideration:

LM293DR is a two-element comparator in 8-SOIC package. This part is not suitable as a direct replacement for four-element applications but may be considered for designs requiring only two comparators with enhanced rail-to-rail output capability.

Frequently Asked Questions (FAQ)

Q: Can LM239DR be used as a direct replacement for LM239DRG3?

A: Yes. LM239DR maintains identical electrical specifications, supply voltage range, input/output characteristics, and 14-SOIC package configuration. No circuit modification is required. LM239DR is in Active product status, ensuring continued availability.

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

A: The LM139 series offers lower input offset voltage (2mV maximum) and extended operating temperature range (-55°C to 125°C) compared to the LM239 series (5mV offset, -25°C to 85°C). Both maintain four-element comparator architecture and 14-SOIC packaging. LM139 variants are suitable for precision applications requiring tighter offset specifications.

Q: Are STMicroelectronics LM239DT and LM239ADT interchangeable?

A: Both parts maintain the same 14-SOIC package and four-element open-collector comparator configuration. LM239ADT offers lower input offset voltage (2mV) compared to LM239DT (5mV). Both support extended temperature range (-40°C to 105°C). Selection depends on offset voltage requirements for the specific application.

Q: Does the onsemi LM239DR2G require circuit modifications?

A: No circuit modifications are required. LM239DR2G maintains the 14-SOIC package footprint and open-collector output configuration. The extended supply voltage range (3V to 36V) provides additional design margin without affecting pin compatibility or signal characteristics.

Q: Why is LM293DR not recommended as a replacement?

A: LM293DR is a two-element comparator in 8-SOIC package, whereas LM239DRG3 is a four-element comparator in 14-SOIC package. LM293DR cannot provide the required number of comparator elements for applications designed around the four-element LM239DRG3 architecture.

Q: What is the significance of Last Time Buy status for LM239DRG3?

A: Last Time Buy status indicates that Texas Instruments has discontinued this part number. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Migration to Active status alternatives such as LM239DR is recommended for new designs and ongoing production requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level, consistent with the original LM239DRG3 specifications.

Q: Can LM2901DT be used in place of LM239DRG3?

A: LM2901DT maintains four-element comparator architecture and 14-SOIC packaging with open-collector output capability. The part supports extended temperature range (-40°C to 125°C) and is in Active status. Input offset voltage is 7mV maximum, which is higher than LM239DRG3 (5mV). Selection depends on whether the application can tolerate the increased offset specification.

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