KA2903DMTF Equivalent & Substitute Parts

Part Overview

The KA2903DMTF is a differential comparator IC manufactured by onsemi, housed in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is suitable for general-purpose comparison applications requiring low input offset voltage and moderate output current capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA2903DMTF
Manufacturer	onsemi
Category	Linear Comparator
Type	Differential
Number of Elements	2
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
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 ~ 85°C
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the KA2903DMTF is determined by the following critical parameters:

Package compatibility: 8-SOIC surface mount form factor (0.154" width, 3.90mm)
Supply voltage range: Minimum 2V to 36V single supply or ±1V to ±18V dual supply
Input offset voltage: Maximum 7mV at specified test conditions
Input bias current: Maximum 0.25µA at 5V
Output current capability: Minimum 16mA typical at 5V
Quiescent current: Maximum 2.5mA
Operating temperature range: Minimum -40°C to 85°C coverage
Number of comparator elements: 2 differential comparators per package

Substitute parts are grouped into three categories based on functional equivalence and product status:

Category 1 - Direct Functional Equivalents (Active Status): Parts meeting all electrical parameters and operating temperature range with current manufacturing status.

Category 2 - Extended Temperature Range Equivalents (Active Status): Parts exceeding the original temperature specification, suitable for applications requiring broader thermal operation.

Category 3 - Automotive Grade Equivalents (Active Status, AEC-Q100 Qualified): Parts meeting automotive qualification standards with enhanced reliability documentation.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
KA2903DMTF	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Obsolete
LM2903DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	Active
LM2903VDR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM393DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
NCV2903DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2903DR	UMW	8-SOIC	2V~30V, ±1V~±15V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
BA10393F-E2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Active
BA2903SF-E2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 105°C	Active
BA2903YF-CE2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	4mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	Active
BA2903YF-MGE2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	Active
LM193DT	STMicroelectronics	8-SOIC	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-55°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Recommendation - onsemi LM2903DR2G: This part maintains onsemi manufacturing continuity with the original KA2903DMTF while offering active product status and extended operating temperature range (-40°C to 105°C). All electrical parameters remain within specification, and the part is available in high volume (136,144 units in stock).

Extended Temperature Alternative - onsemi LM2903VDR2G: Extends operating range to -40°C to 125°C for applications requiring broader thermal operation. Electrical specifications remain equivalent to the original part. Suitable for industrial and automotive-adjacent applications not requiring AEC-Q100 qualification.

Automotive Grade Option - onsemi NCV2903DR2G: Provides AEC-Q100 qualification with -40°C to 125°C operating range. Recommended for automotive and mission-critical applications requiring formal qualification documentation. Propagation delay specification (1.3µs typical) is provided.

Rohm Semiconductor Alternatives - BA2903 Series: The BA2903YF-CE2 and BA2903YF-MGE2 variants offer automotive-grade qualification (AEC-Q100) with extended temperature ranges (-40°C to 125°C). Input offset voltage is comparable or superior (4mV to 7mV). Quiescent current is reduced to 1mA, providing power efficiency advantage. Package dimensions differ slightly (0.173" vs 0.154" width).

STMicroelectronics LM193DT: Offers the broadest operating temperature range (-55°C to 125°C) with superior output current capability (18mA typical). Suitable for extreme temperature applications. RoHS3 compliant with full automotive qualification support.

Voltage Range Consideration - UMW LM2903DR: Supply voltage range is reduced (2V to 30V single supply, ±1V to ±15V dual supply) compared to the original specification. This part is suitable only for applications operating within these narrower voltage limits.

Frequently Asked Questions (FAQ)

Q: Can LM393DR2G replace KA2903DMTF directly?

A: LM393DR2G meets the 8-SOIC package requirement and electrical parameters. However, the operating temperature range is limited to 0°C to 70°C, which is narrower than the original -40°C to 85°C specification. Use this part only if your application operates within 0°C to 70°C.

Q: What is the difference between LM2903DR2G and LM2903VDR2G?

A: Both parts are electrically equivalent. LM2903VDR2G extends the maximum operating temperature to 125°C compared to 105°C for LM2903DR2G. Select LM2903VDR2G for applications requiring operation above 105°C.

Q: Are Rohm BA2903 parts pin-compatible with the original KA2903DMTF?

A: Yes, all BA2903 variants use the 8-SOIC package with identical pinout. Package body dimensions differ slightly (0.173" vs 0.154" width), but this does not affect PCB footprint compatibility for standard 8-SOIC land patterns.

Q: Which substitute part offers the best input offset voltage performance?

A: BA2903YF-CE2 provides the lowest input offset voltage at 4mV @ 5V. For applications sensitive to input offset, this part offers superior performance compared to the original 7mV specification.

Q: Is NCV2903DR2G suitable for non-automotive applications?

A: Yes. NCV2903DR2G is a general-purpose comparator with automotive qualification. The AEC-Q100 certification indicates enhanced reliability and process control, making it suitable for any application requiring high reliability, regardless of automotive use.

Q: What is the advantage of LM193DT over other substitutes?

A: LM193DT provides the widest operating temperature range (-55°C to 125°C) and highest output current (18mA typical). It is the optimal choice for extreme temperature environments or applications requiring maximum output drive capability.

Q: Can I use UMW LM2903DR as a direct replacement?

A: UMW LM2903DR is functionally compatible only for applications operating within 2V to 30V single supply (or ±1V to ±15V dual supply). The original KA2903DMTF supports up to 36V single supply. Verify your application voltage requirements before selecting this part.

Q: Do all substitute parts have RoHS3 compliance?

A: Yes, all listed substitute parts are RoHS3 compliant. All parts also maintain REACH Unaffected status and EAR99 export classification, matching the original part's regulatory profile.

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