LM239AQDREP Equivalent & Substitute Parts

Part Overview

The LM239AQDREP is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent differential comparators in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is designed for open-collector output applications. The part is currently in active production status with 2,472 units in stock.

Substitute parts are necessary when the LM239AQDREP becomes unavailable, when alternative packaging formats are required, or when design specifications allow for functionally equivalent alternatives from different manufacturers. Equivalent parts must maintain compatibility across electrical performance, package dimensions, and output characteristics.

Key Parameters

Parameter	LM239AQDREP
Manufacturer	Texas Instruments
Number of Elements	4
Output Type	Open-Collector
Voltage Supply (Single/Dual)	2V ~ 36V / ±1V ~ 18V
Voltage - Input Offset (Max)	2.5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2mA
Operating Temperature	-40°C ~ 125°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 eligibility is determined by the following criteria:

Electrical Compatibility Requirements:

Four independent comparator elements
Open-Collector output configuration
Supply voltage range: minimum 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage within acceptable tolerance
Input bias current specifications
Output current capability of 16mA or greater
Quiescent current not exceeding 2mA
Operating temperature range encompassing -40°C to 125°C

Package Compatibility Requirements:

14-pin SOIC package (0.154" width, 3.90mm)
Surface-mount configuration
Pin-compatible footprint

Compliance Requirements:

ROHS3 compliance
Moisture sensitivity level 1 or 3 (168 hours)

Substitute parts are grouped into two categories: manufacturer-recommended alternatives and parametric equivalents. Manufacturer-recommended parts are designated by the supplier as direct replacements. Parametric equivalents meet all electrical and mechanical specifications but may have different product status or packaging formats.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Temp Range	Inventory
LM239AQDREP	Texas Instruments	Active	Cut Tape & Digi-Reel	2V~36V / ±1V~18V	2.5mV @ 30V	0.25µA @ 5V	20mA	-40°C ~ 125°C	2,472
LM139AD	Texas Instruments	Last Time Buy	Tube	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	-55°C ~ 125°C	1,540
LM239AQDRG4Q1	Texas Instruments	Active	Tape & Reel	2V~36V / ±1V~18V	2.5mV @ 30V	0.25µA @ 5V	20mA	-40°C ~ 125°C	3,900
LM239AQDRQ1	Texas Instruments	Active	Cut Tape & Digi-Reel	2V~36V / ±1V~18V	2.5mV @ 30V	0.25µA @ 5V	20mA	-40°C ~ 125°C	7,700
AS339AMTR-E1	Diodes Incorporated	Active	Tape & Reel	2V~36V / ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	-40°C ~ 85°C	50,100
AS339MTR-E1	Diodes Incorporated	Active	Cut Tape & Digi-Reel	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	-40°C ~ 85°C	44,546
AS339MTR-G1	Diodes Incorporated	Active	Tape & Reel	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA	-40°C ~ 85°C	21,100
BA2901SF-E2	Rohm Semiconductor	Active	Tape & Reel	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	-40°C ~ 105°C	15,500
LM139ADT	STMicroelectronics	Active	Tape & Reel	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	-55°C ~ 125°C	4,825
LM139DT	STMicroelectronics	Active	Cut Tape & Digi-Reel	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	-55°C ~ 125°C	18,338
LM239ADT	STMicroelectronics	Active	Cut Tape & Digi-Reel	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	-40°C ~ 105°C	15,360

Engineering Selection Recommendations

Direct Parametric Equivalents (Texas Instruments): LM239AQDRG4Q1 and LM239AQDRQ1 are parametrically identical to the LM239AQDREP, differing only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and automotive qualification. Both maintain identical electrical specifications and operating temperature range. Selection between these variants depends on packaging requirements and whether automotive-grade qualification (AEC-Q100) is necessary for the application.

Alternative Manufacturers - Active Status: AS339AMTR-E1, AS339MTR-E1, AS339MTR-G1 (Diodes Incorporated), BA2901SF-E2 (Rohm Semiconductor), LM139ADT, LM139DT, and LM239ADT (STMicroelectronics) are all in active production. These parts maintain the required supply voltage range, output type, and package configuration. Input offset voltage specifications vary between 3mV and 7mV, which remains within acceptable tolerance for general-purpose comparator applications. Output current ratings of 16mA meet the minimum requirement for open-collector operation.

Temperature Range Considerations: The LM239AQDREP operates from -40°C to 125°C. Diodes Incorporated variants (AS339 series) operate to 85°C maximum, which is narrower than the original specification. STMicroelectronics LM139 and LM239 variants extend to 105°C or 125°C, providing equivalent or superior temperature coverage.

Compliance Status: All listed substitute parts maintain ROHS3 compliance and moisture sensitivity levels compatible with standard PCB assembly processes. LM139AD carries Last Time Buy status and should be avoided for new designs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute AS339MTR-E1 for LM239AQDREP in my design? A: AS339MTR-E1 is electrically compatible with identical supply voltage range and output type. However, the maximum operating temperature is 85°C compared to 125°C for the LM239AQDREP. Verify that your application does not require operation above 85°C. Input offset voltage is 5mV versus 2.5mV, which may affect precision-dependent circuits.

Q: What is the difference between LM239AQDRG4Q1 and LM239AQDRQ1? A: Both parts are parametrically identical to LM239AQDREP. LM239AQDRG4Q1 is supplied in Tape & Reel packaging and carries automotive qualification (AEC-Q100). LM239AQDRQ1 is supplied in Cut Tape & Digi-Reel format. Select based on packaging requirements and whether automotive-grade certification is required.

Q: Are STMicroelectronics LM139 and LM239 variants pin-compatible with the LM239AQDREP? A: Yes. All listed parts use the 14-SOIC package with identical pin assignments. However, STMicroelectronics variants have reduced maximum supply voltage (32V versus 36V single supply, 16V versus 18V dual supply). Verify your circuit operates within these lower limits before substitution.

Q: Why do some substitute parts have lower output current ratings? A: Diodes Incorporated and STMicroelectronics variants specify 16mA typical output current versus 20mA for the LM239AQDREP. Both values are sufficient for standard open-collector comparator applications. Applications requiring output currents above 16mA should use the LM239AQDREP or LM139AD.

Q: Can I use LM139AD as a substitute? A: LM139AD is electrically compatible but carries Last Time Buy status, indicating the manufacturer is discontinuing production. This part should not be selected for new designs requiring long-term component availability.

Q: What packaging options are available for substitutes? A: Substitute parts are available in Cut Tape & Digi-Reel (LM239AQDRQ1, AS339MTR-E1, LM139DT, LM239ADT), Tape & Reel (LM239AQDRG4Q1, AS339AMTR-E1, AS339MTR-G1, BA2901SF-E2, LM139ADT), and Tube (LM139AD) formats. All maintain the 14-SOIC surface-mount package footprint.

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