LM239D Equivalent & Substitute Parts

Part Overview

The LM239D is a general-purpose comparator IC with four differential inputs and open-collector outputs, manufactured by Texas Instruments in 14-SOIC surface-mount packaging. 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 LM239D is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM239D
Package Type	14-SOIC (0.154", 3.90mm Width)
Number of Comparators	4
Output Type	Open-Collector
Supply Voltage Range	2V ~ 30V (single), ±1V ~ ±15V (dual)
Input Offset Voltage (Max)	5mV @ 30V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	20mA
Quiescent Current (Max)	2mA
Operating Temperature	-25°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the LM239D is determined by the following critical parameters:

Package compatibility: 14-SOIC form factor with 0.154" (3.90mm) width
Functional equivalence: Four differential comparators with open-collector output capability
Electrical specifications: Supply voltage range, input offset voltage, input bias current, and output current ratings
Operating temperature range: Minimum -25°C operation required for direct replacement
Surface-mount technology: All substitutes must be surface-mount compatible

Substitute parts are grouped into two categories:

Direct Replacements (MFR Recommended): Parts with identical or superior electrical performance, same package footprint, and active product status or equivalent availability.

Upgrade Options: Parts with enhanced specifications (wider temperature range, improved offset voltage, higher supply voltage capability) or automotive-grade qualification, suitable for applications requiring extended performance margins.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current	Quiescent Current	Temp Range	Status
LM239D	Texas Instruments	14-SOIC	2V~30V / ±1V~±15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	Last Time Buy
LM239DR	Texas Instruments	14-SOIC	2V~30V / ±1V~±15V	5mV @ 30V	0.25µA @ 5V	20mA	2mA	-25°C ~ 85°C	Active
LM139AD	Texas Instruments	14-SOIC	2V~30V / ±1V~±15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	Last Time Buy
LM2901AQS14-13	Diodes Incorporated	14-SOIC	2V~36V / ±1V~±18V	2mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2901AS14-13	Diodes Incorporated	14-SOIC	2V~36V / ±1V~±18V	2mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
BA2901SF-E2	Rohm Semiconductor	14-SOIC	2V~36V / ±1V~±18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM139ADT	STMicroelectronics	14-SOIC	2V~32V / ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Active
LM139DT	STMicroelectronics	14-SOIC	2V~32V / ±1V~±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	Active
LM239ADT	STMicroelectronics	14-SOIC	2V~32V / ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active
LM239DR2G	onsemi	14-SOIC	3V~36V / ±1.5V~±18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	Active
LM239DT	STMicroelectronics	14-SOIC	2V~32V / ±1V~±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	Active

Engineering Selection Recommendations

Primary Direct Replacement: LM239DR (Texas Instruments) is the recommended substitute. It maintains identical electrical specifications to the LM239D while offering active product status and superior availability (157,700 units in stock versus 22,200 for the original part). Both parts share the same base product number (LM239) and packaging format, ensuring pin-for-pin compatibility.

Alternative Direct Replacement: LM239DT (STMicroelectronics) provides functional equivalence with active status and high inventory (47,600 units). This part operates within the same supply voltage range and maintains comparable electrical performance, though with a slightly extended operating temperature range (-40°C to 105°C).

Upgrade Option for Extended Temperature Range: LM139ADT (STMicroelectronics) and LM139AD (Texas Instruments) offer superior input offset voltage (2mV maximum versus 5mV) and extended operating temperature range (-55°C to 125°C). These upgrades are suitable for applications requiring enhanced precision or operation in extreme temperature environments. Both parts maintain ROHS3 compliance and 14-SOIC packaging.

Upgrade Option for Automotive Applications: LM2901AQS14-13 (Diodes Incorporated) provides AEC-Q100 automotive qualification with extended supply voltage range (2V to 36V) and improved temperature performance (-40°C to 125°C). This part is suitable for automotive-grade designs requiring enhanced reliability margins.

Alternative Supplier Option: BA2901SF-E2 (Rohm Semiconductor) offers active status with extended supply voltage capability (2V to 36V) and maintains open-collector output compatibility. This part provides supply chain diversification while meeting all critical electrical parameters.

All recommended substitutes maintain ROHS3 compliance and surface-mount 14-SOIC packaging compatibility with the original LM239D.

Frequently Asked Questions (FAQ)

Q: Can LM239DR be used as a direct replacement for LM239D?

A: Yes. LM239DR is electrically and mechanically identical to LM239D, with the same 14-SOIC package footprint, supply voltage range (2V to 30V single, ±1V to ±15V dual), and output specifications. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and product status (Active versus Last Time Buy). Pin configuration and electrical performance are equivalent.

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

A: Both are four-channel general-purpose comparators in 14-SOIC packaging. The LM139 series offers superior input offset voltage (2mV maximum versus 5mV for LM239) and extended operating temperature range (-55°C to 125°C versus -25°C to 85°C for standard LM239D). The LM139 is suitable for precision applications requiring tighter offset specifications and wider temperature operation.

Q: Are Diodes Incorporated LM2901 parts compatible with Texas Instruments LM239D?

A: Yes, with considerations. LM2901AQS14-13 and LM2901AS14-13 maintain the same 14-SOIC package and four-channel comparator architecture. Both offer extended supply voltage range (2V to 36V) and improved temperature performance (-40°C to 125°C). Output current is slightly lower (16mA versus 20mA typical), which is acceptable for most applications. Verify output drive requirements in your specific circuit before substitution.

Q: Can I use LM239DR2G (onsemi) as a substitute?

A: LM239DR2G is functionally compatible with the same 14-SOIC package and four-channel architecture. However, the minimum supply voltage is 3V (versus 2V for LM239D), which may limit use in low-voltage applications. Verify your circuit's minimum supply voltage requirement before selecting this part.

Q: What packaging formats are available for LM239 comparators?

A: The LM239 base product is available in multiple packaging formats: Tube (LM239D), Cut Tape & Digi-Reel (LM239DR, LM239DT), and Tape & Reel (LM2901AQS14-13). All maintain the same 14-SOIC footprint and electrical specifications. Select packaging based on your procurement and assembly requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed maintain ROHS3 compliance status, ensuring compatibility with environmental and regulatory requirements equivalent to the original LM239D.

Q: Which substitute offers the best precision for low-offset applications?

A: LM139ADT and LM139AD both specify 2mV maximum input offset voltage at 30V, compared to 5mV for the LM239D. These parts are recommended for applications requiring tighter offset specifications and precision voltage comparison.

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