LM139ADR Equivalent & Substitute Parts

Part Overview

The LM139ADR is a general-purpose comparator IC manufactured by Texas Instruments, featuring four differential comparators in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is designed for open-collector, open-drain output applications. The LM139ADR maintains active product status with 21,330 units in stock.

Substitute parts become necessary when the primary part reaches end-of-life status, when alternative packaging formats are required for manufacturing compatibility, or when sourcing from multiple manufacturers is needed for supply chain resilience. Several equivalent devices from STMicroelectronics, Rohm Semiconductor, and Diodes Incorporated provide functional alternatives while maintaining core electrical specifications.

Key Parameters

Parameter	LM139ADR
Manufacturer	Texas Instruments
Number of Elements	4
Output Type	Open-Collector, Open-Drain
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V
Voltage - Input Offset (Max)	2mV @ 30V
Current - Input Bias (Max)	0.1µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2mA
Operating Temperature	-55°C ~ 125°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

Substitution eligibility is determined by the following critical parameters:

Four differential comparator elements
General-purpose comparator topology
Supply voltage range compatibility (minimum 2V ~ 30V single supply or ±1V ~ ±15V dual supply)
Input offset voltage within acceptable tolerance
Input bias current specifications
Output current capability (minimum 16mA typical)
Quiescent current within 2.5mA maximum
Surface-mount package format (14-SOIC or equivalent pin-compatible alternatives)
ROHS3 compliance and MSL rating

Substitute parts are grouped into two categories: parametric equivalents with identical electrical specifications and manufacturer-recommended alternatives with minor variations in electrical characteristics or package format.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply (V)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range (°C)	Package	Packaging Type
LM139ADR	Texas Instruments	Active	2~30 / ±1~15	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55 ~ 125	14-SOIC	Cut Tape & Digi-Reel
LM139ADRG4	Texas Instruments	Discontinued at DiGi Electronics	2~30 / ±1~15	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55 ~ 125	14-SOIC	Tape & Reel
BA2901SF-E2	Rohm Semiconductor	Active	2~36 / ±1~18	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40 ~ 105	14-SOP	Tape & Reel
LM139ADT	STMicroelectronics	Active	2~32 / ±1~16	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55 ~ 125	14-SOIC	Tape & Reel
LM139DT	STMicroelectronics	Active	2~32 / ±1~16	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55 ~ 125	14-SOIC	Cut Tape & Digi-Reel
LM239ADT	STMicroelectronics	Active	2~32 / ±1~16	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40 ~ 105	14-SOIC	Cut Tape & Digi-Reel
LM239DT	STMicroelectronics	Active	2~32 / ±1~16	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40 ~ 105	14-SOIC	Cut Tape & Digi-Reel
LM2901DT	STMicroelectronics	Active	2~32 / ±1~16	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40 ~ 125	14-SOIC	Cut Tape & Digi-Reel
LM2901HYDT	STMicroelectronics	Active	2~36 / ±1~18	Not specified	Not specified	Not specified	2.5mA	Not specified	14-SOIC	Tape & Reel
LM2901QT14-13	Diodes Incorporated	Active	2~36 / ±1~18	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40 ~ 125	14-TSSOP	Tape & Reel
LM2901T14-13	Diodes Incorporated	Active	2~36 / ±1~18	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40 ~ 125	14-TSSOP	Tape & Reel

Engineering Selection Recommendations

Direct Parametric Equivalents (Preferred for Drop-In Replacement)

LM139ADT and LM239ADT from STMicroelectronics maintain the closest electrical alignment with the LM139ADR. Both devices are active products with ROHS3 compliance and MSL 1 rating. LM139ADT matches the input offset specification (2mV @ 30V) and input bias current (0.1µA @ 5V) of the original part. LM239ADT provides identical electrical performance with extended supply voltage range (±1V ~ ±16V dual supply). Both are available in Cut Tape & Digi-Reel packaging, matching the original distribution format.

Alternative Manufacturers with Extended Supply Range

BA2901SF-E2 from Rohm Semiconductor and LM2901HYDT from STMicroelectronics extend the supply voltage range to 2V ~ 36V single supply and ±1V ~ ±18V dual supply. These parts are suitable for applications requiring higher voltage tolerance. BA2901SF-E2 operates across -40°C ~ 105°C, which may limit use in extended temperature applications. LM2901HYDT includes AEC-Q100 automotive qualification and MSL 3 rating, appropriate for automotive and harsh environment deployments.

Package Format Alternatives

LM2901QT14-13 and LM2901T14-13 from Diodes Incorporated provide 14-TSSOP packaging instead of 14-SOIC. These parts are suitable when board layout requires smaller package footprint (0.173" width versus 0.154" for SOIC). Both devices are active products with AEC-Q100 qualification and support the extended supply voltage range (2V ~ 36V / ±1V ~ ±18V).

Inventory and Availability Considerations

LM2901DT from STMicroelectronics offers the highest inventory availability (185,200 units) among substitute options. LM139DT and LM239DT provide substantial stock levels (18,338 and 47,600 units respectively) with Cut Tape & Digi-Reel packaging matching the original distribution method.

Frequently Asked Questions (FAQ)

Q: Can LM139ADT directly replace LM139ADR in existing designs?

A: Yes. LM139ADT maintains identical electrical specifications for input offset voltage (2mV @ 30V), input bias current (0.1µA @ 5V), and quiescent current (2mA). Both use 14-SOIC packaging with identical pin configuration. The primary difference is packaging format (Tape & Reel versus Cut Tape & Digi-Reel), which does not affect circuit performance.

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

A: Both series contain four general-purpose comparators in 14-SOIC packages with identical pin configurations. LM139 variants typically specify tighter input offset voltage tolerance (2mV @ 30V) compared to LM239 variants (5mV @ 30V). LM239 series may offer extended operating temperature ranges or alternative output types. Selection depends on specific offset voltage requirements in the application.

Q: Are 14-TSSOP packages compatible with 14-SOIC PCB layouts?

A: No. While both are 14-pin surface-mount packages, 14-TSSOP (0.173" width) and 14-SOIC (0.154" width) have different footprints and pin spacing. PCB redesign is required to accommodate LM2901QT14-13 or LM2901T14-13 alternatives. Verify footprint compatibility before selecting TSSOP variants.

Q: Which substitute part supports the widest supply voltage range?

A: LM2901HYDT and LM2901QT14-13 support 2V ~ 36V single supply and ±1V ~ ±18V dual supply, extending beyond the LM139ADR specification (2V ~ 30V / ±1V ~ ±15V). These parts are suitable for applications requiring higher voltage tolerance.

Q: What does AEC-Q100 qualification indicate?

A: AEC-Q100 qualification certifies that the component meets automotive industry reliability and quality standards. LM2901HYDT and LM2901QT14-13 carry this qualification, making them suitable for automotive applications and environments with stringent reliability requirements.

Q: Does MSL rating affect component handling?

A: Yes. MSL 1 (Unlimited) rated parts like LM139ADR and LM139ADT require no moisture bake-out before soldering and have unlimited shelf life. MSL 3 (168 Hours) rated parts like LM2901HYDT and LM2901T14-13 require moisture bake-out if exposed to ambient humidity for extended periods. Verify storage and handling procedures based on MSL rating.

Q: Can I use LM2901DT as a substitute despite higher quiescent current (2.5mA versus 2mA)?

A: Yes, if the application power budget permits. The 0.5mA increase in quiescent current is within acceptable tolerance for most general-purpose comparator applications. Verify total system power consumption before selection.

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