KA2901DMTF Equivalent & Substitute Parts

Part Overview

The KA2901DMTF is a 4-channel general-purpose comparator manufactured by onsemi in 14-SOP surface-mount packaging. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with DTL, MOS, open-collector, and TTL output configurations. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA2901DMTF
Manufacturer	onsemi
Category	Linear Comparator
Number of Elements	4
Output Type	DTL, MOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	2V ~ 36V / ±1V ~ 18V
Input Offset Voltage (Max)	7mV @ 5V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	18mA @ 5V
Quiescent Current (Max)	2.5mA
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the KA2901DMTF is determined by the following critical parameters:

Electrical Compatibility:

Number of elements: 4 channels
Output type: Open-collector configuration (primary requirement)
Supply voltage range: Minimum 2V ~ 36V single supply or ±1V ~ 18V dual supply
Input offset voltage: Maximum 7mV @ 5V
Input bias current: Maximum 0.25µA @ 5V
Quiescent current: Maximum 2.5mA

Mechanical Compatibility:

Package type: 14-pin SOIC or equivalent 14-pin SOP
Mounting type: Surface mount
Pin pitch and footprint: 0.154" to 0.173" width tolerance

Regulatory & Environmental:

Moisture sensitivity level: MSL 1 or MSL 3 acceptable
Operating temperature range: Minimum -40°C ~ 85°C

Substitute parts are grouped into three categories: direct replacements (onsemi LM2901 series), automotive-qualified alternatives (NCV2901, Texas Instruments AEC-Q100 variants), and cross-manufacturer equivalents (Diodes Incorporated AS339, Rohm BA2901 series).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package
KA2901DMTF	onsemi	Obsolete	DTL, MOS, OC, TTL	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 85°C	14-SOIC
LM2901DR2G	onsemi	Active	CMOS, OC, 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, OC, TTL	3V~36V / ±1.5V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC
NCV2901DR2G	onsemi	Active	CMOS, OC, TTL	3V~36V / ±1.5V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	14-SOIC
LM2901QDRG4Q1	Texas Instruments	Last Time Buy	OC	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC
LM2901VQDRG4Q1	Texas Instruments	Last Time Buy	OC	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC
AS339AMTR-E1	Diodes Incorporated	Active	OC	2V~36V / ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC
AS339MTR-E1	Diodes Incorporated	Active	OC	2V~36V / ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC
BA2901SF-E2	Rohm Semiconductor	Active	OC	2V~36V / ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP
BA2901YF-MGE2	Rohm Semiconductor	Active	OC	2V~36V / ±1V~18V	7mV @ 5V	0.05µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	14-SOP
LM139AD	Texas Instruments	Last Time Buy	OC, OD	2V~30V / ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (onsemi LM2901 Series): LM2901DR2G and LM2901VDR2G are direct onsemi replacements with active product status. Both maintain the 4-channel open-collector architecture and 14-SOIC package. LM2901VDR2G extends the operating temperature range to 125°C and is preferred for applications requiring extended thermal performance. Minimum supply voltage increases from 2V to 3V in single-supply mode; verify circuit compatibility before selection.

Automotive-Qualified Alternatives: NCV2901DR2G (onsemi) and LM2901QDRG4Q1 / LM2901VQDRG4Q1 (Texas Instruments) carry AEC-Q100 automotive qualification. These parts are suitable for automotive and industrial applications requiring formal qualification documentation. NCV2901DR2G maintains onsemi ecosystem compatibility; Texas Instruments variants provide cross-manufacturer redundancy.

Cross-Manufacturer Equivalents: AS339AMTR-E1 and AS339MTR-E1 (Diodes Incorporated) and BA2901SF-E2 / BA2901YF-MGE2 (Rohm Semiconductor) provide alternative sourcing. Diodes AS339 series offers lower input offset voltage (3mV to 5mV). Rohm BA2901YF-MGE2 features reduced quiescent current (1mA) and input bias current (0.05µA), beneficial for low-power applications. BA2901 series uses 14-SOP packaging (0.173" width) instead of standard 14-SOIC; verify PCB footprint compatibility.

Last-Time-Buy Considerations: LM139AD (Texas Instruments) and Texas Instruments LM2901 variants marked "Last Time Buy" have limited availability. These are suitable only for legacy system maintenance or when existing design validation requires identical part sourcing.

Frequently Asked Questions (FAQ)

Q: Can LM2901DR2G directly replace KA2901DMTF without circuit modification? A: LM2901DR2G is electrically compatible for most applications. The minimum single-supply voltage increases from 2V to 3V. Verify that your circuit operates above 3V. All other electrical parameters (input offset, bias current, output current, quiescent current) remain within acceptable tolerance.

Q: What is the difference between LM2901VDR2G and NCV2901DR2G? A: Both are onsemi LM2901 variants in 14-SOIC packaging with identical electrical specifications. NCV2901DR2G carries AEC-Q100 automotive qualification and is designated for automotive applications. LM2901VDR2G is the industrial-grade equivalent. Select NCV2901DR2G for automotive designs; LM2901VDR2G for general industrial use.

Q: Why do Rohm BA2901 parts use 14-SOP instead of 14-SOIC? A: BA2901 series uses 14-SOP packaging with 0.173" width versus standard 14-SOIC at 0.154" width. While pin count and pitch are identical, the package body is slightly wider. Verify PCB footprint compatibility before substitution. Both are surface-mount packages with equivalent thermal and electrical performance.

Q: Is AS339AMTR-E1 suitable for low-voltage applications below 3V? A: Yes. AS339AMTR-E1 maintains the original KA2901DMTF supply voltage range of 2V to 36V (single supply). It is suitable for 2V minimum supply applications where onsemi LM2901DR2G (3V minimum) cannot be used.

Q: What is the advantage of BA2901YF-MGE2 over other substitutes? A: BA2901YF-MGE2 features reduced quiescent current (1mA versus 2mA to 2.5mA) and lower input bias current (0.05µA versus 0.25µA). These characteristics reduce power consumption and are beneficial for battery-powered or ultra-low-power applications. It carries AEC-Q100 automotive qualification and operates to 125°C.

Q: Can LM139AD replace KA2901DMTF in all applications? A: LM139AD is functionally compatible but has limitations. Maximum dual-supply voltage is ±15V (versus ±18V for KA2901DMTF). The part is marked "Last Time Buy" with limited availability. Use only for legacy system maintenance where existing design validation requires this specific part.

Q: What packaging considerations apply when switching from KA2901DMTF to substitute parts? A: Most substitutes use standard 14-SOIC (0.154" width) packaging compatible with KA2901DMTF footprints. Rohm BA2901 series uses 14-SOP (0.173" width), requiring footprint verification. All parts are surface-mount with identical pin configurations. Confirm PCB layout compatibility before production transition.

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