LM239DRG4 Equivalent & Substitute Parts

Part Overview

The LM239DRG4 is a general-purpose comparator IC with four differential inputs and open-collector outputs, manufactured by Texas Instruments 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.

The LM239DRG4 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value
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 LM239DRG4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Number of elements: 4 differential comparators
Output type: Open-Collector configuration
Supply voltage range: Minimum 2V to 30V single supply capability
Input offset voltage: Maximum 5mV @ 30V
Input bias current: Maximum 0.25µA @ 5V
Output current: Minimum 16mA typical capability
Quiescent current: Maximum 2.5mA

Physical Compatibility Requirements:

Package: 14-SOIC form factor (0.154" to 0.173" width acceptable)
Mounting: Surface mount
Pin count: 14 pins

Compliance Requirements:

RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts are grouped into three categories: manufacturer-recommended direct replacements (active status preferred), parametric equivalents (matching electrical specifications), and compatible alternatives from secondary manufacturers.

Parameter Comparison

Part Number	Manufacturer	Status	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package
LM239DRG4	Texas Instruments	Obsolete	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC
LM239DR	Texas Instruments	Active	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC
LM239DRG3	Texas Instruments	Last Time Buy	2V~30V / ±1V~15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC
LM339MX/NOPB	Texas Instruments	Active	2V~36V / ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC
LM139AD	Texas Instruments	Last Time Buy	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC
LM139ADT	STMicroelectronics	Active	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC
LM139DT	STMicroelectronics	Active	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC
LM239ADT	STMicroelectronics	Active	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC
LM239DR2G	onsemi	Active	3V~36V / ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	14-SOIC
LM239DT	STMicroelectronics	Active	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC
BA2901SF-E2	Rohm Semiconductor	Active	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP

Engineering Selection Recommendations

Primary Recommendation: LM239DR (Texas Instruments)

LM239DR is the direct active replacement for LM239DRG4. It maintains identical electrical specifications, supply voltage range, and operating temperature limits. As an active product from the original manufacturer with ROHS3 compliance and unlimited MSL rating, it provides the highest design continuity and supply chain stability.

Secondary Recommendation: LM239DT (STMicroelectronics)

LM239DT is an active alternative with compatible electrical characteristics. It supports the same supply voltage range and input offset specifications as the original part. The extended operating temperature range (-40°C to 105°C) provides additional thermal margin for demanding applications. ROHS3 compliant with unlimited MSL rating.

Alternative for Extended Temperature Range: LM139ADT (STMicroelectronics)

LM139ADT operates across -55°C to 125°C, offering superior temperature performance. Input offset voltage is reduced to 2mV maximum and input bias current to 0.1µA maximum, providing improved precision. Supply voltage range is 2V to 32V single supply, which covers the original specification. Active product status with full compliance certifications.

Alternative for Higher Supply Voltage: LM339MX/NOPB (Texas Instruments)

LM339MX/NOPB extends supply voltage capability to 2V to 36V single supply (±1V to ±18V dual supply), suitable for applications requiring higher voltage operation. Electrical specifications remain compatible with the original part. Active product with ROHS3 compliance.

Cross-Manufacturer Option: LM239DR2G (onsemi)

LM239DR2G provides an active alternative from onsemi with compatible electrical performance. Supply voltage range extends to 3V to 36V single supply. Suitable for designs requiring secondary-source qualification. ROHS3 compliant with unlimited MSL rating.

Note on LM139AD and LM239DRG3:

Both parts carry Last Time Buy status and should not be selected for new designs requiring long-term supply assurance, despite their electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM239DR be used as a direct drop-in replacement for LM239DRG4?

A: Yes. LM239DR is electrically and mechanically identical to LM239DRG4. Both use the 14-SOIC package with identical pin assignments, supply voltage ranges, and output specifications. The primary difference is product status: LM239DR is active while LM239DRG4 is obsolete.

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

A: The LM139 series offers improved input offset voltage (2mV maximum versus 5mV) and reduced input bias current (0.1µA versus 0.25µA), providing higher precision. LM139 devices also support extended operating temperature ranges up to 125°C. Both series maintain four differential comparators with open-collector outputs in 14-SOIC packages.

Q: Are there package compatibility concerns when substituting with BA2901SF-E2?

A: BA2901SF-E2 uses a 14-SOP package (0.173" width) versus the standard 14-SOIC (0.154" width). While both are surface-mount packages with identical pin counts and assignments, PCB layout and footprint dimensions differ slightly. Verify PCB design compatibility before implementation.

Q: Which substitute part supports the widest supply voltage range?

A: LM339MX/NOPB and LM239DR2G both support 2V to 36V single supply operation (±1V to ±18V dual supply), extending beyond the original LM239DRG4 specification of 2V to 30V. These parts are suitable for applications requiring higher voltage margins.

Q: What is the significance of Last Time Buy status for LM139AD and LM239DRG3?

A: Last Time Buy status indicates the manufacturer will discontinue production after a specified date. These parts should not be selected for new designs or long-term production programs. Use active alternatives such as LM239DR or LM239DT instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL rating of 1 (Unlimited), meeting current environmental and reliability standards.

Q: Can LM239DR2G be used in applications with supply voltages below 3V?

A: No. LM239DR2G specifies a minimum supply voltage of 3V single supply, whereas LM239DRG4 operates down to 2V. For applications requiring 2V operation, use LM239DR, LM239DT, or LM139ADT instead.

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