LM239ADRE4 Equivalent & Substitute Parts

Part Overview

The LM239ADRE4 is a general-purpose quad comparator IC manufactured by Texas Instruments, housed in a 14-SOIC surface-mount package. 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 LM239ADRE4 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering improved availability and, in some cases, extended operating temperature ranges or enhanced electrical characteristics.

Key Parameters

Parameter	Value
Number of Elements	4
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V
Voltage - Input Offset (Max)	3mV @ 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 (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM239ADRE4 are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitutability:

Critical Matching Parameters:

Number of elements: 4 comparators
Output type: Open-Collector (primary requirement)
Package type: 14-SOIC with 0.154" width (3.90mm)
Supply voltage range: Minimum 2V ~ 30V single supply capability
Input offset voltage: Maximum 3mV @ 30V or better
Input bias current: Maximum 0.25µA @ 5V or better
Output current: Minimum 16mA typical
Quiescent current: Maximum 2.5mA
Surface-mount configuration
RoHS3 compliance

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally compatible with minor specification variations). All listed substitutes maintain the core 4-element comparator architecture, open-collector output topology, and 14-SOIC package footprint required for direct replacement.

Parameter Comparison

Part Number	Manufacturer	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Status
LM239ADRE4	Texas Instruments	Open-Collector	2V~30V, ±1V~15V	3mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	Obsolete
LM239ADR	Texas Instruments	Open-Collector	2V~30V, ±1V~15V	3mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	Active
LM139AD	Texas Instruments	Open-Collector, Open-Drain	2V~30V, ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	Last Time Buy
LM239ADT	STMicroelectronics	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA	2mA	-40°C ~ 105°C	Active
LM139ADT	STMicroelectronics	Open-Collector	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA	2mA	-55°C ~ 125°C	Active
LM139DT	STMicroelectronics	Open-Collector	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA	2mA	-55°C ~ 125°C	Active
LM239DT	STMicroelectronics	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA	2mA	-40°C ~ 105°C	Active
LM2901DT	STMicroelectronics	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	7mV @ 5V	0.25µA @ 5V	16mA	2.5mA	-40°C ~ 125°C	Active
LM2901HYDT	STMicroelectronics	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~36V, ±1V~18V	Not specified	Not specified	Not specified	2.5mA	Automotive grade	Active
LM239DR2G	onsemi	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA	2.5mA	-25°C ~ 85°C	Active
BA2901SF-E2	Rohm Semiconductor	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): LM239ADR from Texas Instruments is the parametric equivalent to LM239ADRE4. It maintains identical electrical specifications and operates across the same supply voltage and temperature ranges. LM239ADR is currently in active production status with high inventory availability (105,300 units), making it the preferred choice for direct substitution in new designs and production runs.

Manufacturer-Recommended Alternatives:

LM139AD (Texas Instruments) offers improved electrical characteristics with lower input offset voltage (2mV vs. 3mV) and reduced input bias current (0.1µA vs. 0.25µA). It extends the operating temperature range to -55°C ~ 125°C and is classified as Last Time Buy status. This part is suitable for applications requiring enhanced precision or extended temperature operation.

LM239ADT and LM139ADT (STMicroelectronics) provide active production status with extended temperature ranges (-40°C ~ 105°C or -55°C ~ 125°C). These parts are electrically compatible and maintain the required 14-SOIC package footprint. STMicroelectronics variants offer high inventory availability (15,360 and 4,825 units respectively).

LM2901DT (STMicroelectronics) is functionally compatible with extended temperature capability (-40°C ~ 125°C) and high inventory (185,200 units). Input offset voltage specification is 7mV @ 5V, which remains within acceptable tolerance for general-purpose comparator applications.

LM239DR2G (onsemi) maintains active status with 105,400 units in stock. Supply voltage range extends to 3V ~ 36V (±1.5V ~ 18V), providing broader operating envelope. This part is suitable for applications with higher supply voltage requirements.

BA2901SF-E2 (Rohm Semiconductor) is a cross-manufacturer alternative with 14-SOP package (0.173" width vs. 0.154" standard). While footprint dimensions differ slightly, electrical compatibility is maintained. This part is recommended only when onsemi or STMicroelectronics alternatives are unavailable.

LM2901HYDT (STMicroelectronics) is an automotive-grade variant with AEC-Q100 qualification and extended supply voltage range (2V ~ 36V, ±1V ~ 18V). Moisture sensitivity level is MSL 3 (168 hours). This part is specified for automotive applications requiring qualification compliance.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original LM239ADRE4.

Frequently Asked Questions (FAQ)

Q: Can LM239ADR be used as a direct replacement for LM239ADRE4? A: Yes. LM239ADR is the parametric equivalent with identical electrical specifications, supply voltage range, and operating temperature. The primary difference is packaging format (Tape & Reel vs. Digi-Reel) and active production status. Pin configuration and functional behavior are identical.

Q: What is the difference between LM239 and LM139 series comparators? A: Both are quad comparators in 14-SOIC packages with open-collector outputs. LM139 variants typically offer lower input offset voltage (2mV vs. 3mV) and reduced input bias current (0.1µA vs. 0.25µA). LM139 parts generally support extended temperature ranges (-55°C ~ 125°C vs. -25°C ~ 85°C). Selection depends on application precision requirements and temperature environment.

Q: Are STMicroelectronics LM239ADT and LM139ADT compatible with the original LM239ADRE4? A: Yes, both are functionally compatible. LM239ADT maintains identical base specifications to LM239ADRE4. LM139ADT offers improved input offset voltage and bias current specifications. Both support the required 14-SOIC package and open-collector output topology. Operating temperature ranges differ slightly (STMicroelectronics: -40°C ~ 105°C or -55°C ~ 125°C vs. original: -25°C ~ 85°C).

Q: Can I use LM2901DT as a substitute? A: Yes. LM2901DT is functionally compatible with extended temperature range (-40°C ~ 125°C) and high production availability. Input offset voltage is specified at 7mV @ 5V, which is acceptable for general-purpose comparator applications. Quiescent current is slightly higher (2.5mA vs. 2mA). This part is suitable for applications not requiring the tighter input offset specification of the original.

Q: What is the significance of the 14-SOIC package width specification? A: The 14-SOIC package has two standard widths: 0.154" (3.90mm) and 0.173" (4.40mm). The LM239ADRE4 uses the narrower 0.154" variant. Most substitutes maintain this width for direct PCB footprint compatibility. BA2901SF-E2 uses the wider 0.173" package and requires PCB layout verification before substitution.

Q: Is LM2901HYDT suitable for non-automotive applications? A: LM2901HYDT is automotive-qualified (AEC-Q100) with MSL 3 moisture sensitivity. While electrically compatible, it is specified for automotive environments. For non-automotive applications, standard industrial-grade alternatives (LM239ADT, LM139ADT, LM2901DT) are more cost-effective and appropriate.

Q: What supply voltage range should I verify when selecting a substitute? A: The original LM239ADRE4 operates at 2V ~ 30V (single supply) or ±1V ~ 15V (dual supply). Most substitutes support this range or exceed it. Verify that your application's supply voltage falls within the selected substitute's specified range. onsemi LM239DR2G requires minimum 3V single supply, which may not be compatible with 2V applications.

Q: Are all listed substitutes RoHS3 compliant? A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original LM239ADRE4 for applications subject to environmental restrictions.

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