LM139AW Equivalent & Substitute Parts

Part Overview

The LM139AW is a quad differential comparator manufactured by Texas Instruments, designed for general-purpose comparison applications. This device features open-collector and open-drain output configurations, operating across a wide supply voltage range of 5V to 30V (single supply) or ±2.5V to ±15V (dual supply). The LM139AW is classified as an active product with full RoHS3 compliance and is currently in stock with 836 units available.

Equivalent and substitute parts are identified based on matching functional characteristics: quad-element general-purpose comparator topology, compatible output types, overlapping supply voltage ranges, and equivalent electrical performance parameters. Substitutes accommodate different packaging requirements and thermal specifications while maintaining core functionality.

Key Parameters

Parameter	LM139AW Value	Unit	Substitution Relevance
Number of Elements	4	Elements	Critical - must match for pin-compatible replacement
Output Type	Open-Collector, Open-Drain	Configuration	Critical - determines circuit interface requirements
Voltage - Supply, Single/Dual	5V ~ 30V, ±2.5V ~ 15V	V	Critical - must support application supply voltage
Voltage - Input Offset (Max)	2mV @ 5V	mV	Important - affects comparison accuracy
Current - Input Bias (Max)	0.1µA @ 5V	µA	Important - affects input circuit loading
Current - Output (Typ)	16mA @ 5V	mA	Important - determines output drive capability
Current - Quiescent (Max)	2mA	mA	Important - affects power consumption
Propagation Delay (Max)	300ns (Typ)	ns	Important - affects timing-critical applications
Operating Temperature	-55°C ~ 125°C	°C	Important - determines environmental suitability
Package / Case	14-CFlatPack	Configuration	Critical - determines physical compatibility
Mounting Type	Surface Mount	Configuration	Critical - must match PCB assembly process
RoHS Status	ROHS3 Compliant	Compliance	Important - regulatory requirement

Substitute Part Grouping Explanation

Substitute parts for the LM139AW are identified through strict parameter matching across the following critical dimensions:

Functional Equivalence: All substitute parts contain four independent comparator elements configured for general-purpose signal comparison, matching the LM139AW's core topology.

Output Type Compatibility: The LM139AW specifies open-collector and open-drain outputs. Substitute parts must support these output configurations or compatible alternatives (CMOS, TTL, DTL, ECL, MOS) that function equivalently in open-collector pull-up circuits.

Supply Voltage Range: The LM139AW operates from 5V to 30V (single supply) or ±2.5V to ±15V (dual supply). Substitute parts must support the application's required supply voltage. Parts with extended ranges (such as 2V to 36V) provide additional design flexibility while maintaining compatibility with the LM139AW's specified range.

Electrical Performance: Input offset voltage, input bias current, output current, and quiescent current must be within acceptable tolerances for the application. Substitutes with equivalent or superior specifications (lower offset voltage, lower bias current) are functionally compatible.

Package and Mounting: The LM139AW uses 14-pin surface-mount packaging. Substitutes are grouped by package type (14-CFlatPack, 14-SOIC, 14-TSSOP, 16-QFN) to accommodate different PCB layout and assembly requirements.

Temperature Range: The LM139AW operates from -55°C to 125°C. Substitutes with matching or extended temperature ranges are suitable; parts with narrower ranges require application-specific thermal validation.

Compliance: All substitute parts maintain RoHS3 compliance, matching the LM139AW's regulatory status.

Parameter Comparison

Part Number	Manufacturer	Package Type	Elements	Output Type	Supply Voltage Range	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	RoHS Status
LM139AW	Texas Instruments	14-CFlatPack	4	Open-Collector, Open-Drain	5V~30V, ±2.5V~±15V	2mV @ 5V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	ROHS3
CMP04FSZ-REEL	Analog Devices Inc.	14-SOIC	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	3.3V~36V, ±1.65V~±18V	1mV @ 5V	0.1µA @ 5V	16mA @ 5V	3mA	-40°C ~ 85°C	ROHS3
LM139ADT	STMicroelectronics	14-SOIC	4	General Purpose	2V~32V, ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	ROHS3
LM239APT	STMicroelectronics	14-TSSOP	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~±16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	ROHS3
LM239DR2G	onsemi	14-SOIC	4	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~±18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	ROHS3
LM239DTBR2G	onsemi	14-TSSOP	4	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~±18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	ROHS3
LM239QT	STMicroelectronics	16-QFN (3x3)	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~36V, ±1V~±18V	5mV	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	ROHS3
LM2901DT	STMicroelectronics	14-SOIC	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~±16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM2901YPT	STMicroelectronics	14-TSSOP	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~±16V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3
LM339DT	STMicroelectronics	14-SOIC	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~±16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3
LM339QT	STMicroelectronics	16-QFN (3x3)	4	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~36V, ±1V~±18V	Not specified	Not specified	Not specified	2.5mA	Not specified	ROHS3

Engineering Selection Recommendations

Package Selection: The LM139AW uses 14-pin CFlatPack surface-mount packaging. Direct package-compatible substitutes include LM139ADT (14-SOIC). Alternative packages (14-TSSOP, 16-QFN) require PCB layout modification but offer different thermal and density characteristics.

Temperature Range Considerations: The LM139AW operates from -55°C to 125°C, supporting extended industrial temperature applications. Substitutes with matching temperature ranges include LM139ADT (-55°C to 125°C), LM2901DT (-40°C to 125°C), and LM2901YPT (-40°C to 125°C). Parts with narrower ranges (such as LM239DR2G at -25°C to 85°C or LM339DT at 0°C to 70°C) are suitable only for applications within their specified temperature limits.

Supply Voltage Compatibility: The LM139AW supports 5V to 30V single supply or ±2.5V to ±15V dual supply. All listed substitutes support the 5V supply point. Parts with extended upper voltage limits (such as CMP04FSZ-REEL at 3.3V to 36V or LM239QT at 2V to 36V) provide additional design margin. Parts with lower minimum voltage specifications (such as LM2901DT at 2V minimum) are compatible with the LM139AW's 5V operating point.

Electrical Performance: The LM139AW specifies 2mV maximum input offset voltage at 5V and 0.1µA maximum input bias current. Substitutes with equivalent or superior specifications (lower offset voltage, lower bias current) maintain or improve comparison accuracy. Parts with higher offset voltage (such as LM239DR2G at 5mV or LM2901DT at 7mV) are functionally compatible but may require circuit-level offset compensation in precision applications.

Output Current and Quiescent Current: All substitutes provide 16mA typical output current at 5V, matching the LM139AW's drive capability. Quiescent current specifications range from 2mA to 3mA, with all values within acceptable power consumption limits for general-purpose applications.

Compliance and Product Status: All substitute parts maintain active product status and RoHS3 compliance, matching the LM139AW's regulatory and supply-chain characteristics. No substitutes are obsolete or restricted.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM139AW with LM139ADT without PCB modification?

A: LM139ADT uses 14-SOIC packaging while LM139AW uses 14-CFlatPack. Both are 14-pin surface-mount packages with different physical dimensions and pin spacing. Direct socket replacement is not possible; PCB layout modification is required. However, electrical functionality is fully compatible.

Q: What is the difference between open-collector and CMOS output types in substitute parts?

A: The LM139AW specifies open-collector and open-drain outputs, which require external pull-up resistors to a supply voltage. Substitute parts listing CMOS, DTL, ECL, MOS, or TTL outputs indicate additional output stage options. Open-collector functionality is included in these parts and is compatible with the LM139AW's circuit interface requirements.

Q: Are onsemi LM239 parts (LM239DR2G, LM239DTBR2G) suitable replacements for industrial temperature applications?

A: onsemi LM239 parts operate from -25°C to 85°C, which is narrower than the LM139AW's -55°C to 125°C range. These parts are suitable for commercial and industrial applications within their specified temperature limits but are not appropriate for extended-temperature or military-grade applications requiring the full -55°C to 125°C range.

Q: What is the significance of the 16-QFN package option (LM239QT, LM339QT)?

A: The 16-QFN (3x3mm) package provides a smaller footprint than 14-pin SOIC or TSSOP packages, enabling higher PCB density. However, 16-QFN packages include additional ground pins compared to the 14-pin LM139AW, requiring different PCB layout and assembly processes. This package is suitable for space-constrained applications where the additional pins and smaller size provide design benefits.

Q: Can I use LM339DT as a substitute if my application operates at 0°C to 70°C?

A: LM339DT is specified for 0°C to 70°C operation, which is narrower than the LM139AW's -55°C to 125°C range. If your application operates within the 0°C to 70°C window, LM339DT is electrically compatible. However, if your application requires operation below 0°C or above 70°C, LM339DT is not suitable.

Q: What is the advantage of STMicroelectronics LM2901YPT with AEC-Q100 qualification?

A: LM2901YPT carries AEC-Q100 automotive qualification, indicating compliance with automotive industry reliability and testing standards. This qualification is relevant only for automotive applications. For general industrial or commercial applications, AEC-Q100 qualification provides no functional advantage over non-qualified parts.

Q: How do I select between 14-TSSOP and 14-SOIC packages for LM239 substitutes?

A: Both 14-TSSOP (0.173" width, 4.40mm) and 14-SOIC (0.154" width, 3.90mm) are 14-pin surface-mount packages with different physical dimensions. TSSOP packages are narrower and support higher PCB density. SOIC packages are more widely used in legacy designs. Selection depends on PCB layout constraints and assembly equipment compatibility. Electrical performance is equivalent between these package types.

Q: Are there supply voltage limitations when substituting LM139AW in ±15V dual-supply applications?

A: The LM139AW supports ±2.5V to ±15V dual supply. Most substitutes support equivalent or extended dual-supply ranges. For example, CMP04FSZ-REEL supports ±1.65V to ±18V, providing additional margin. All listed substitutes are compatible with ±15V dual-supply operation.

Q: What input offset voltage specification should I use for precision comparison circuits?

A: The LM139AW specifies 2mV maximum input offset voltage at 5V. Substitutes with equivalent specifications (LM139ADT, LM239APT at 2mV) maintain precision. Parts with higher offset voltage (LM239DR2G, LM239DTBR2G, LM239QT, LM339DT at 5mV, or LM2901DT, LM2901YPT at 7mV) require circuit-level offset compensation or are suitable only for applications with relaxed precision requirements.

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