KA339DTF Equivalent & Substitute Parts

Part Overview

The KA339DTF is a general-purpose comparator IC manufactured by onsemi, featuring four independent comparators in a 14-SOP package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

The KA339DTF operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is suitable for applications requiring general-purpose voltage comparison with DTL, MOS, open-collector, and TTL output configurations. Due to its obsolete status, equivalent active parts must be evaluated for direct substitution or design migration.

Key Parameters

Parameter	KA339DTF Value
Number of Elements	4
Output Type	DTL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	18mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°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 of the KA339DTF is determined by the following critical parameters:

Four independent comparator elements
Open-collector output configuration
Supply voltage range compatibility (minimum 2V to 36V single supply)
Input offset voltage specification (5mV @ 5V or better)
Input bias current (0.25µA @ 5V or lower)
Package compatibility (14-SOIC form factor with 0.154" width)
Surface mount technology
ROHS3 compliance and MSL rating

Substitute parts are grouped into two categories:

Direct Equivalents (Active Status): Parts with identical or superior electrical specifications, active product status, and compatible packaging. These include LM339DR2G, LM239DR2G, LM2901DR2G, and LM2901VDR2G from onsemi, plus AS339MTR-E1 and AS339AMTR-E1 from Diodes Incorporated.

Functional Alternatives (Extended Temperature or Automotive Grade): Parts meeting core electrical requirements with enhanced temperature ranges or automotive qualification, such as LM239AQDRQ1 (Texas Instruments, automotive grade) and BA2901SF-E2 (Rohm Semiconductor).

Legacy Options (Last Time Buy or Obsolete): Parts including LM139AD and LM139ADG4 from Texas Instruments, suitable only for legacy system maintenance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage Range	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package
KA339DTF	onsemi	Obsolete	DTL, MOS, Open-Collector, TTL	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC
LM339DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC
LM239DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-25°C ~ 85°C	14-SOIC
LM2901DR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	14-SOIC
LM2901VDR2G	onsemi	Active	CMOS, Open-Collector, TTL	3V~36V, ±1.5V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC
LM239AQDRQ1	Texas Instruments	Active	Open-Collector	2V~36V, ±1V~18V	2.5mV @ 30V	0.25µA @ 5V	20mA	2mA	-40°C ~ 125°C	14-SOIC
AS339MTR-E1	Diodes Incorporated	Active	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC
AS339AMTR-E1	Diodes Incorporated	Active	Open-Collector	2V~36V, ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC
BA2901SF-E2	Rohm Semiconductor	Active	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC (0.173", 4.40mm)
LM139AD	Texas Instruments	Last Time Buy	Open-Collector, Open-Drain	2V~30V, ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC
LM139ADG4	Texas Instruments	Obsolete	Open-Collector, Open-Drain	2V~30V, ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

LM339DR2G and LM239DR2G from onsemi provide the closest electrical match to the KA339DTF with identical input offset voltage (5mV @ 5V) and active product status. Both maintain the 14-SOIC package form factor and ROHS3 compliance. LM239DR2G extends the operating temperature range to -25°C to 85°C, suitable for applications requiring enhanced thermal performance.

LM2901DR2G and LM2901VDR2G offer extended temperature ranges (-40°C to 105°C and -40°C to 125°C respectively) with marginally higher input offset voltage (7mV @ 5V). These are appropriate for industrial and automotive environments where temperature stability is critical.

Automotive-Grade Alternative:

LM239AQDRQ1 from Texas Instruments is qualified to AEC-Q100 automotive standards with active product status. It provides superior input offset voltage (2.5mV @ 30V) and extended temperature range (-40°C to 125°C), making it suitable for automotive and mission-critical applications.

Cross-Manufacturer Options:

AS339MTR-E1 and AS339AMTR-E1 from Diodes Incorporated maintain full electrical compatibility with the KA339DTF. AS339AMTR-E1 offers improved input offset voltage (3mV @ 5V) and is available in active status with extended temperature range (-40°C to 85°C).

BA2901SF-E2 from Rohm Semiconductor provides functional equivalence with extended temperature range (-40°C to 105°C). Note that this part features a slightly wider package (0.173" vs. 0.154"), which may require PCB layout verification.

Legacy Maintenance:

LM139AD (Last Time Buy status) and LM139ADG4 (Obsolete status) from Texas Instruments are suitable only for legacy system repairs and should not be selected for new designs. These parts offer superior specifications but are subject to supply discontinuation.

Frequently Asked Questions (FAQ)

Q: Can LM339DR2G directly replace KA339DTF without circuit modification?

A: LM339DR2G is electrically compatible with KA339DTF for most applications. Both devices feature four comparators, identical input offset voltage (5mV @ 5V), and compatible supply voltage ranges. The primary difference is the minimum supply voltage (3V vs. 2V), which may affect ultra-low-voltage applications. Package dimensions are identical (14-SOIC, 0.154" width), enabling direct PCB substitution.

Q: What is the difference between LM239DR2G and LM2901DR2G?

A: Both are four-comparator ICs in 14-SOIC packages from onsemi with active product status. LM239DR2G operates from -25°C to 85°C with 5mV input offset voltage. LM2901DR2G extends the temperature range to -40°C to 105°C but has 7mV input offset voltage. Selection depends on thermal requirements and offset voltage tolerance in the application.

Q: Is LM239AQDRQ1 suitable for non-automotive applications?

A: Yes. LM239AQDRQ1 is AEC-Q100 qualified but functions as a general-purpose comparator in any application. Its automotive qualification indicates enhanced reliability and extended temperature range (-40°C to 125°C), making it suitable for industrial, medical, and high-reliability applications beyond automotive use.

Q: Why does BA2901SF-E2 have a different package width?

A: BA2901SF-E2 uses a 14-SOP package with 0.173" width compared to the standard 14-SOIC 0.154" width. While both are 14-pin surface-mount packages, the wider body may affect PCB layout compatibility. Verify footprint dimensions before substitution.

Q: Can I use LM139AD as a replacement for KA339DTF?

A: LM139AD is electrically compatible but carries Last Time Buy status, indicating imminent supply discontinuation. It should be used only for legacy system maintenance. For new designs or long-term production, select active-status alternatives such as LM339DR2G or LM239AQDRQ1.

Q: What is the significance of MSL rating differences?

A: KA339DTF and most active substitutes carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. AS339MTR-E1 carries MSL 3 (168 Hours), requiring controlled humidity storage and limiting shelf life. For high-volume production with extended inventory, MSL 1 parts are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the KA339DTF.

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