KA2903D Equivalent & Substitute Parts

Part Overview

The KA2903D is a differential comparator IC manufactured by onsemi in 8-SOIC surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The KA2903D operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with a maximum input offset voltage of 7mV at 5V and typical output current of 16mA at 5V. Finding suitable alternatives ensures access to active, in-stock components while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	KA2903D Value
Manufacturer	onsemi
Product Status	Obsolete
Type	Differential
Number of Elements	2
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
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the KA2903D is determined by the following critical parameters:

Electrical Compatibility Requirements:

Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage: maximum 7mV at specified test conditions
Input bias current: maximum 0.25µA at 5V
Output current capability: minimum 16mA at 5V
Quiescent current: maximum 2.5mA
Number of comparator elements: 2

Mechanical Compatibility Requirements:

Package type: 8-SOIC surface mount
Package width: 0.154" (3.90mm) or compatible 8-SOP variants (0.173", 4.40mm)
Mounting type: Surface mount

Functional Requirements:

Comparator function with dual elements
Operating temperature range: minimum -40°C to 85°C

Substitute parts are grouped into two categories: direct electrical equivalents in identical 8-SOIC packaging, and functional equivalents in compatible 8-SOP packaging. All listed substitutes meet or exceed the electrical specifications of the KA2903D while maintaining pin-compatible or functionally equivalent configurations.

Parameter Comparison

Part Number	Manufacturer	Product Status	Type	Voltage - Supply (V)	Input Offset (mV)	Input Bias (µA)	Output Current (mA)	Quiescent Current (mA)	Temp Range (°C)	Package	RoHS Status
KA2903D	onsemi	Obsolete	Differential	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 85	8-SOIC	N/A
LM2903DR2G	onsemi	Active	General Purpose	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 105	8-SOIC	ROHS3
LM2903VDR2G	onsemi	Active	General Purpose	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	8-SOIC	ROHS3
LM393DR2G	onsemi	Active	General Purpose	2-36, ±1-18	5 @ 30V	0.25 @ 5V	16 @ 5V	2.5	0 to 70	8-SOIC	ROHS3
NCV2903DR2G	onsemi	Active	General Purpose	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	8-SOIC	ROHS3
LM2903D	STMicroelectronics	Active	General Purpose	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	8-SOIC	ROHS3
BA10393F-E2	Rohm Semiconductor	Active	General Purpose	2-36, ±1-18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 85	8-SOP	ROHS3
BA2903SF-E2	Rohm Semiconductor	Active	General Purpose	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 105	8-SOP	ROHS3
BA2903YF-CE2	Rohm Semiconductor	Active	General Purpose	2-36, ±1-18	4 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 125	8-SOP	ROHS3
BA2903YF-MGE2	Rohm Semiconductor	Active	General Purpose	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 125	8-SOP	ROHS3
LM193DT	STMicroelectronics	Active	General Purpose	2-36, ±1-18	5 @ 30V	0.25 @ 5V	18 @ 5V	2.5	-55 to 125	8-SOIC	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Identical 8-SOIC Package):

LM2903DR2G and LM2903VDR2G from onsemi provide direct package compatibility with the KA2903D. Both are active products with ROHS3 compliance. LM2903VDR2G extends the operating temperature range to -40°C to 125°C, offering improved thermal performance for extended-temperature applications. LM2903D from STMicroelectronics is an active alternative with identical electrical specifications and ROHS3 compliance, suitable for applications requiring multi-source qualification.

Extended Temperature Range Option:

LM193DT from STMicroelectronics operates from -55°C to 125°C, providing the widest temperature coverage among available substitutes. This part maintains electrical compatibility while offering enhanced low-temperature performance. Output current capability is rated at 18mA at 5V, exceeding the KA2903D specification.

Automotive-Grade Alternatives:

NCV2903DR2G from onsemi carries AEC-Q100 automotive qualification and operates to -40°C to 125°C. BA2903YF-CE2 and BA2903YF-MGE2 from Rohm Semiconductor are automotive-qualified alternatives in 8-SOP packaging with operating ranges to -40°C to 125°C.

Package Variant Consideration:

Rohm Semiconductor BA series comparators (BA10393F-E2, BA2903SF-E2, BA2903YF-CE2, BA2903YF-MGE2) are available in 8-SOP packaging (0.173", 4.40mm width) as functional equivalents. These parts maintain electrical compatibility but require PCB layout adjustment due to the wider package footprint. All Rohm parts feature reduced quiescent current (1mA maximum) compared to the KA2903D specification (2.5mA maximum).

Frequently Asked Questions (FAQ)

Q: Can LM2903DR2G directly replace KA2903D without PCB modification?

A: Yes. LM2903DR2G is pin-compatible in the same 8-SOIC (0.154", 3.90mm width) package. Electrical specifications are equivalent or superior. No PCB layout changes are required.

Q: What is the difference between 8-SOIC and 8-SOP packaging?

A: Both are 8-pin surface mount packages, but 8-SOP has a wider body (0.173", 4.40mm) compared to 8-SOIC (0.154", 3.90mm). Rohm Semiconductor BA series parts use 8-SOP packaging. PCB footprint adjustment is necessary if switching from 8-SOIC to 8-SOP variants.

Q: Why is the KA2903D listed as obsolete?

A: The KA2903D is no longer in active production. Active alternatives from onsemi (LM2903 series), STMicroelectronics (LM2903D, LM193DT), and Rohm Semiconductor (BA2903 series) provide equivalent or superior performance with ongoing manufacturing support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status. The original KA2903D does not specify RoHS status due to its obsolete classification.

Q: Which substitute offers the best thermal performance?

A: LM193DT from STMicroelectronics operates from -55°C to 125°C, providing the widest temperature range. LM2903VDR2G, NCV2903DR2G, and Rohm BA2903YF variants operate to -40°C to 125°C.

Q: Can I use automotive-grade parts in non-automotive applications?

A: Yes. Automotive-qualified parts (NCV2903DR2G, BA2903YF-CE2, BA2903YF-MGE2) meet or exceed standard industrial specifications and are suitable for any application requiring their electrical characteristics.

Q: What is the inventory status of substitute parts?

A: LM393DR2G has the highest inventory (205,400 pcs), followed by NCV2903DR2G (145,200 pcs) and BA10393F-E2 (105,300 pcs). All listed substitutes are in active production with substantial stock availability.

Q: Do substitute parts have identical pin configurations?

A: Yes, all 8-SOIC variants (LM2903DR2G, LM2903VDR2G, LM393DR2G, NCV2903DR2G, LM2903D, LM193DT) are pin-compatible. Rohm 8-SOP variants (BA10393F-E2, BA2903SF-E2, BA2903YF-CE2, BA2903YF-MGE2) require PCB footprint adjustment but maintain functional pin compatibility.

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