LM239ADRG4 Equivalent & Substitute Parts

Part Overview

The LM239ADRG4 is a general-purpose quad comparator IC manufactured by Texas Instruments in a 14-SOIC surface-mount package. This device features four independent open-collector comparators suitable for analog signal comparison applications across industrial and consumer electronics. The LM239ADRG4 carries an Obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM239ADRG4
Manufacturer	Texas Instruments
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM239ADRG4 is determined by the following critical parameters:

Number of Elements: Must be 4 independent comparators
Output Type: Open-Collector configuration required for direct compatibility
Package Type: 14-SOIC form factor with 0.154" width (3.90mm) for PCB layout compatibility
Voltage Supply Range: Must support 2V ~ 30V single supply or ±1V ~ 15V dual supply minimum
Input Offset Voltage: Maximum 3mV @ 30V or better
Input Bias Current: Maximum 0.25µA @ 5V or better
Output Current: Minimum 20mA typical capability
Quiescent Current: Maximum 2mA
Operating Temperature: Minimum -25°C ~ 85°C range
Surface Mount Compatibility: SOIC package for automated assembly

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications and package) and manufacturer-recommended alternatives (functionally compatible with minor parameter variations within acceptable design margins).

Parameter Comparison

Parameter	LM239ADRG4	LM239ADR	LM139AD	BA2901SF-E2	LM139ADT	LM139DT	LM239ADT	LM239DR2G	LM239DT	LM2901DT	LM2901HYDT
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor	STMicroelectronics	STMicroelectronics	STMicroelectronics	onsemi	STMicroelectronics	STMicroelectronics	STMicroelectronics
Number of Elements	4	4	4	4	4	4	4	4	4	4	4
Output Type	Open-Collector	Open-Collector	Open-Collector, Open-Drain	Open-Collector	Not Specified	Not Specified	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	2V ~ 30V, ±1V ~ 15V	2V ~ 30V, ±1V ~ 15V	2V ~ 30V, ±1V ~ 15V	2V ~ 36V, ±1V ~ 18V	2V ~ 32V, ±1V ~ 16V	2V ~ 32V, ±1V ~ 16V	2V ~ 32V, ±1V ~ 16V	3V ~ 36V, ±1.5V ~ 18V	2V ~ 32V, ±1V ~ 16V	2V ~ 32V, ±1V ~ 16V	2V ~ 36V, ±1V ~ 18V
Input Offset Voltage (Max)	3mV @ 30V	3mV @ 30V	2mV @ 30V	7mV @ 5V	2mV @ 30V	5mV @ 30V	2mV @ 30V	5mV @ 5V	5mV @ 30V	7mV @ 5V	Not Specified
Input Bias Current (Max)	0.25µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	Not Specified
Output Current (Typ)	20mA	20mA	20mA	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	Not Specified
Quiescent Current (Max)	2mA	2mA	2mA	2mA	2mA	2mA	2mA	2.5mA	2mA	2.5mA	2.5mA
Operating Temperature	-25°C ~ 85°C	-25°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C	-25°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 125°C	Not Specified
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.173", 4.40mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Parametric Equivalent: LM239ADR (Texas Instruments) is the direct parametric equivalent to LM239ADRG4, offering identical electrical specifications and packaging. This part carries Active product status with high inventory availability (105,300 units), ensuring long-term supply continuity. Both parts are ROHS3 compliant and share the same base product number (LM239).

Manufacturer-Recommended Alternatives: LM139AD (Texas Instruments) provides enhanced performance with lower input offset voltage (2mV vs. 3mV) and reduced input bias current (0.1µA vs. 0.25µA), while maintaining the same 14-SOIC package footprint. This part supports an extended operating temperature range (-55°C ~ 125°C) and carries Last Time Buy status. LM139ADT (STMicroelectronics) offers identical electrical performance to LM139AD with Active product status and 4,825 units in stock.

Cross-Manufacturer Alternatives: LM239DT (STMicroelectronics) and LM2901DT (STMicroelectronics) provide functional compatibility with the LM239ADRG4 within the same 14-SOIC package. LM2901DT offers the widest operating temperature range (-40°C ~ 125°C) and highest inventory (185,200 units). LM239DR2G (onsemi) maintains compatibility with slightly elevated quiescent current (2.5mA vs. 2mA) and minimum supply voltage of 3V single supply.

Extended Supply Range Option: BA2901SF-E2 (Rohm Semiconductor) supports the widest voltage supply range (2V ~ 36V, ±1V ~ 18V) and extended operating temperature (-40°C ~ 105°C), though output current is reduced to 16mA typical and package width is slightly larger (0.173" vs. 0.154"). This part is suitable for applications requiring enhanced voltage headroom.

Automotive-Grade Alternative: LM2901HYDT (STMicroelectronics) carries AEC-Q100 automotive qualification with Moisture Sensitivity Level 3, suitable for automotive and harsh-environment applications. This part supports 2V ~ 36V supply range and maintains 2.5mA quiescent current specification.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original LM239ADRG4.

Frequently Asked Questions (FAQ)

Q: Can LM239ADR directly replace LM239ADRG4 in production? A: Yes. LM239ADR is the parametric equivalent with identical electrical specifications, package dimensions, and pin configuration. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. original packaging). No circuit modifications are required.

Q: What is the difference between LM139AD and LM239ADRG4? A: LM139AD offers superior input offset voltage (2mV vs. 3mV) and lower input bias current (0.1µA vs. 0.25µA). Both support the same supply voltage range and package type. LM139AD extends the operating temperature range to -55°C ~ 125°C. The LM139 base product number indicates a different device variant within the same family.

Q: Is BA2901SF-E2 compatible with LM239ADRG4? A: BA2901SF-E2 is functionally compatible but with package width variation (0.173" vs. 0.154"). This may require PCB layout verification for tight spacing applications. Output current is reduced to 16mA typical. The part supports extended voltage range (2V ~ 36V) suitable for wider supply applications.

Q: Which substitute offers the best long-term availability? A: LM2901DT (STMicroelectronics) provides the highest inventory (185,200 units) with Active product status and extended temperature range (-40°C ~ 125°C). LM239ADR (Texas Instruments) offers 105,300 units with identical specifications to the original part.

Q: Can I use LM2901HYDT in non-automotive applications? A: Yes. LM2901HYDT is AEC-Q100 qualified for automotive use but functions in standard industrial and consumer applications. The automotive qualification ensures higher reliability standards and stricter manufacturing controls, making it suitable for mission-critical designs.

Q: What is the impact of quiescent current differences (2mA vs. 2.5mA)? A: The 0.5mA difference is negligible in most applications. For battery-powered or ultra-low-power designs, LM239ADR, LM139AD, LM139ADT, LM239ADT, and LM239DT maintain the 2mA specification. LM239DR2G, LM2901DT, and LM2901HYDT specify 2.5mA maximum.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original LM239ADRG4 for EU and international markets.

Q: Which substitute supports the widest operating temperature range? A: LM2901DT and LM139DT both support -40°C ~ 125°C, providing 40°C additional low-temperature capability compared to LM239ADRG4 (-25°C ~ 85°C). LM139AD and LM139ADT also support this extended range.

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