LM239AD Equivalent & Substitute Parts

Part Overview

The LM239AD is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent differential comparators with open-collector outputs in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range of 2V to 30V (single supply) or ±1V to ±15V (dual supply), making it suitable for analog signal comparison applications in industrial and consumer electronics.

The LM239AD is currently in Last Time Buy status, indicating that Texas Instruments has discontinued this part number. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for new designs or production runs.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM239AD
Type	General Purpose Comparator
Number of Elements	4
Output Type	Open-Collector
Supply Voltage Range	2V ~ 30V (single), ±1V ~ 15V (dual)
Input Offset Voltage (Max)	3mV @ 30V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	20mA
Quiescent Current (Max)	2mA
Operating Temperature	-25°C ~ 85°C
Package	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LM239AD are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility:

Four independent comparators (Number of Elements = 4)
Open-collector output configuration
Supply voltage range overlap with 2V ~ 30V single supply or ±1V ~ 15V dual supply capability
Input offset voltage and input bias current within acceptable ranges for general-purpose applications
Output current capability of 16mA or greater

Mechanical Compatibility:

14-pin SOIC or equivalent package footprint (0.154" to 0.173" width tolerance)
Surface-mount technology

Compliance Requirements:

RoHS3 compliance
REACH unaffected status
EAR99 export classification

Substitutes are divided into two categories: direct pin-compatible replacements (same manufacturer, same base part number with different packaging) and functional equivalents (different manufacturers or base part numbers with compatible electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Status
LM239AD	Texas Instruments	2V~30V / ±1V~15V	3mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC	Last Time Buy
LM239ADR	Texas Instruments	2V~30V / ±1V~15V	3mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	14-SOIC	Active
LM139AD	Texas Instruments	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
LM339AM/NOPB	National Semiconductor	2V~36V / ±1V~18V	2mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	Active
BA2901SF-E2	Rohm Semiconductor	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Active
LM139ADT	STMicroelectronics	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139DT	STMicroelectronics	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM239ADT	STMicroelectronics	2V~32V / ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM239DR2G	onsemi	3V~36V / ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	14-SOIC	Active
LM239DT	STMicroelectronics	2V~32V / ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC	Active
LM2901AQT14-13	Diodes Incorporated	2V~36V / ±1V~18V	2mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-TSSOP	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

LM239ADR is the primary recommended substitute. Manufactured by Texas Instruments, it is electrically and mechanically identical to the LM239AD with identical electrical specifications. The only difference is packaging format (Tape & Reel versus Tube), which does not affect circuit performance. This part is in Active status with high inventory availability (105,300 units), ensuring long-term supply continuity.

Tier 2 - Compatible Alternatives (Same Manufacturer, Different Base Part):

LM139AD and LM139ADT (STMicroelectronics) offer improved specifications with lower input offset voltage (2mV versus 3mV) and lower input bias current (0.1µA versus 0.25µA). Both maintain the same supply voltage range and output current capability. LM139ADT is in Active status with 4,825 units in stock. These parts are suitable for applications requiring tighter input specifications.

Tier 3 - Functional Equivalents (Different Manufacturers):

LM239ADT and LM239DT (STMicroelectronics), LM239DR2G (onsemi), and LM2901AQT14-13 (Diodes Incorporated) are functionally equivalent with four independent comparators and open-collector outputs. All are in Active status with substantial inventory. These parts maintain compatibility with the LM239AD electrical interface while offering extended temperature ranges or improved specifications in specific parameters.

LM339AM/NOPB (National Semiconductor) and BA2901SF-E2 (Rohm Semiconductor) are also compatible but with minor specification variations. LM339AM/NOPB has a narrower operating temperature range (0°C to 70°C), while BA2901SF-E2 uses a 14-SOP package variant with slightly different physical dimensions.

Compliance Verification:

All recommended substitutes maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification, matching the original LM239AD regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM239AD with LM239ADR on my PCB?

A: Yes. LM239ADR is pin-compatible and electrically identical to LM239AD. The only difference is the packaging format (Tape & Reel versus Tube). Both use the same 14-SOIC footprint and have identical electrical specifications. No circuit modifications are required.

Q: What is the difference between LM239AD and LM139AD?

A: Both are four-channel comparators with open-collector outputs in 14-SOIC packages. LM139AD offers superior input specifications: lower input offset voltage (2mV versus 3mV) and lower input bias current (0.1µA versus 0.25µA). LM139AD also supports an extended operating temperature range (-55°C to 125°C versus -25°C to 85°C). These improvements make LM139AD suitable for precision applications or environments with wider temperature extremes.

Q: Are STMicroelectronics LM239ADT and LM239DT interchangeable?

A: Both are functionally equivalent four-channel comparators in 14-SOIC packages from STMicroelectronics. LM239ADT has lower input offset voltage (2mV @ 30V) and lower input bias current (0.1µA @ 5V) compared to LM239DT (5mV @ 30V and 0.25µA @ 5V). LM239ADT is preferred for applications requiring tighter input specifications. Both are in Active status with good availability.

Q: Can I use LM2901AQT14-13 as a substitute for LM239AD?

A: LM2901AQT14-13 is functionally compatible with four independent comparators and open-collector outputs. However, it uses a 14-TSSOP package instead of 14-SOIC, requiring PCB layout modifications. The part is qualified to AEC-Q100 automotive standards and supports an extended temperature range (-40°C to 125°C). Use this substitute only if your PCB design can accommodate the different package footprint.

Q: Why does BA2901SF-E2 have a different package designation (14-SOP)?

A: BA2901SF-E2 from Rohm Semiconductor uses a 14-SOP package with slightly different physical dimensions (0.173" width versus 0.154" for standard 14-SOIC). While functionally compatible, this package variant may not fit existing 14-SOIC footprints without PCB redesign. Verify package compatibility with your PCB layout before selection.

Q: Which substitute offers the best long-term availability?

A: LM239ADR (Texas Instruments) and LM239DR2G (onsemi) both have the highest inventory levels (105,300 and 105,400 units respectively) and Active product status, ensuring reliable long-term supply. Both are recommended for new designs requiring sustained component availability.

Q: What is the minimum supply voltage for LM239AD substitutes?

A: Most substitutes support 2V minimum supply voltage, matching the original LM239AD specification. LM239DR2G (onsemi) has a slightly higher minimum of 3V for single supply. Verify your application's minimum supply voltage requirement against the selected substitute's datasheet.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, matching the original LM239AD regulatory requirements for environmental and hazardous substance restrictions.

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