LM2901QT14-13 Equivalent & Substitute Parts

Part Overview

The LM2901QT14-13 is a general-purpose quad comparator IC manufactured by Diodes Incorporated in a 14-TSSOP surface-mount package. This device features CMOS and TTL output types with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual), making it suitable for automotive-grade applications with AEC-Q100 qualification. The part is currently active in production with 7600 units in stock. Equivalent and substitute parts are necessary when the original part becomes unavailable, when alternative packaging or mounting types are required for design flexibility, or when sourcing from different manufacturers is preferred for supply chain optimization.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2901QT14-13
Manufacturer	Diodes Incorporated
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Number of Elements	4
Output Type	CMOS, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	-40°C ~ 125°C
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM2901QT14-13 is determined by the following critical parameters: quad comparator configuration (4 elements), general-purpose application type, compatible output types (CMOS, TTL, or Open-Collector variants), overlapping supply voltage ranges, and surface-mount or through-hole packaging options. The substitute parts are grouped into three categories based on packaging and output characteristics:

Category 1: Surface-Mount TSSOP Package (Direct Package Match)

LM239PWR (14-TSSOP, Open-Collector output)
LM2901PWR (14-TSSOP, CMOS/MOS/Open-Collector output, Obsolete status)

Category 2: Surface-Mount SOIC Package (Alternative SMD)

LM139ADR (14-SOIC, Open-Collector/Open-Drain output)
LM239AD (14-SOIC, Multi-output type, Obsolete status)
LM239AMDREP (14-SOIC, Open-Collector output)
LM239AQDREP (14-SOIC, Open-Collector output)
LM2901D (14-SOIC, Multi-output type)
LM2901QDRG4Q1 (14-SOIC, Open-Collector output, Automotive AEC-Q100)

Category 3: Through-Hole DIP Package (Alternative Mounting)

LM139J/PB (14-CDIP, Open-Collector/Open-Drain output)
LM239N (14-PDIP, Open-Collector output)

Substitution logic is based on matching the number of comparator elements (4), general-purpose type classification, compatible output types within the CMOS/TTL/Open-Collector family, and overlapping supply voltage specifications. Package selection depends on PCB design requirements and mounting technology constraints.

Parameter Comparison

Parameter	LM2901QT14-13	LM239PWR	LM139ADR	LM239AQDREP	LM2901D	LM2901QDRG4Q1	LM139J/PB	LM239N
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments
Package	14-TSSOP	14-TSSOP	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-CDIP	14-PDIP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Through Hole	Through Hole
Number of Elements	4	4	4	4	4	4	4	4
Output Type	CMOS, TTL	Open-Collector	Open-Collector, Open-Drain	Open-Collector	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector	Open-Collector, Open-Drain	Open-Collector
Voltage - Supply Single (V)	2 ~ 36	2 ~ 30	2 ~ 30	2 ~ 36	2 ~ 32	2 ~ 36	2 ~ 36	2 ~ 30
Voltage - Supply Dual (±V)	±1 ~ 18	±1 ~ 15	±1 ~ 15	±1 ~ 18	±1 ~ 16	±1 ~ 18	±1 ~ 18	±1 ~ 15
Voltage - Input Offset (Max)	7mV @ 5V	5mV @ 30V	2mV @ 30V	2.5mV @ 30V	7mV @ 5V	7mV @ 5V	5mV @ 30V	5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V	20mA	20mA	20mA	16mA @ 5V	20mA	16mA @ 5V	20mA
Current - Quiescent (Max)	2.5mA	2mA	2mA	2mA	2.5mA	2.5mA	2.5mA	2mA
Operating Temperature	-40°C ~ 125°C	-25°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-25°C ~ 85°C
Grade	Automotive	Commercial	Commercial	Commercial	Commercial	Automotive	Commercial	Commercial
Qualification	AEC-Q100	None Listed	None Listed	None Listed	None Listed	AEC-Q100	None Listed	None Listed
Product Status	Active	Active	Active	Active	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable

Engineering Selection Recommendations

For Automotive Applications with AEC-Q100 Requirement: LM2901QDRG4Q1 is the primary substitute when maintaining automotive-grade qualification is mandatory. This part matches the LM2901QT14-13 in supply voltage range (2V ~ 36V, ±1V ~ 18V), operating temperature (-40°C ~ 125°C), and AEC-Q100 certification. The package change from 14-TSSOP to 14-SOIC requires PCB layout modification but maintains surface-mount technology. Product status is Last Time Buy, indicating limited future availability.

For Commercial Applications with TSSOP Package Preference: LM239PWR provides the closest package match (14-TSSOP) with active product status and high inventory availability (68,435 units). However, the supply voltage range is reduced to 2V ~ 30V (single) and ±1V ~ 15V (dual), and the operating temperature is limited to -25°C ~ 85°C. This part is suitable only for applications not requiring the full -40°C to 125°C temperature range or the extended 36V supply capability.

For Commercial Applications with SOIC Package: LM139ADR and LM239AQDREP offer active product status with SOIC packaging. LM139ADR provides superior input offset voltage (2mV @ 30V) and input bias current (0.1µA @ 5V) specifications. LM239AQDREP maintains the full supply voltage range (2V ~ 36V, ±1V ~ 18V) and operating temperature (-40°C ~ 125°C) of the original part.

For Through-Hole Applications: LM139J/PB (14-CDIP) and LM239N (14-PDIP) are suitable for designs requiring through-hole mounting. LM139J/PB supports the full supply voltage range and extended temperature range (-55°C ~ 125°C). LM239N has reduced temperature range (-25°C ~ 85°C) and supply voltage limits.

Obsolete Parts to Avoid: LM239AD and LM2901PWR are marked as obsolete and should not be selected for new designs despite potential availability in current inventory.

Frequently Asked Questions (FAQ)

Q: Can LM239PWR directly replace LM2901QT14-13 in automotive applications? A: No. While LM239PWR matches the 14-TSSOP package, it lacks AEC-Q100 qualification and has reduced supply voltage range (2V ~ 30V vs. 2V ~ 36V) and operating temperature range (-25°C ~ 85°C vs. -40°C ~ 125°C). For automotive applications, use LM2901QDRG4Q1.

Q: What is the difference between Open-Collector and CMOS/TTL output types? A: The LM2901QT14-13 features CMOS and TTL output types, which are push-pull outputs capable of sourcing and sinking current. Open-Collector outputs (found in LM239 and LM139 variants) require external pull-up resistors and can only sink current. Circuit design must account for this difference in output stage configuration.

Q: Can I use a through-hole DIP package substitute on a surface-mount PCB? A: No. Through-hole packages (14-CDIP, 14-PDIP) require plated holes and different PCB footprints than surface-mount technology. Use only if your PCB design supports through-hole mounting or if you employ adapter modules.

Q: Why do some substitutes have different input offset voltage specifications? A: Input offset voltage varies by manufacturer process and test conditions. LM139ADR specifies 2mV @ 30V while LM2901QT14-13 specifies 7mV @ 5V. These are measured at different supply voltages and represent typical performance across the manufacturer's process variation. Verify that the substitute's specification meets your circuit requirements.

Q: Is LM2901QDRG4Q1 suitable for new designs despite Last Time Buy status? A: LM2901QDRG4Q1 is appropriate for designs requiring automotive qualification and the full electrical specification match. However, Last Time Buy status indicates limited future availability. Confirm long-term supply with your distributor before committing to production.

Q: What packaging considerations apply when switching from TSSOP to SOIC? A: Both are surface-mount packages with different footprints. 14-TSSOP has 0.173" width (4.40mm) while 14-SOIC has 0.154" width (3.90mm). PCB layout, trace routing, and thermal management may require adjustment. Verify footprint compatibility with your design tools before layout changes.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant status, matching the original LM2901QT14-13. MSL ratings are uniformly 1 (Unlimited) for all surface-mount variants, indicating no moisture sensitivity restrictions during storage and handling.

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