KA2903M Equivalent & Substitute Parts

Part Overview

The KA2903M is a differential comparator IC manufactured by onsemi in 8-DIP packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The KA2903M 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 quiescent current of 2.5mA maximum. As an obsolete product, identifying compatible active alternatives ensures design continuity and supply chain reliability.

Substiute Parts

KA2903M

onsemiIn Stock: 2587KA2903M Datasheet

Current PartRFQ

LM2903P

Texas InstrumentsIn Stock: 22619LM2903P Datasheet

DirectRFQ

LM393PE3

Texas InstrumentsIn Stock: 33664LM393PE3 Datasheet

SimilarRFQ

LT1017IN8#PBF

Analog Devices Inc.In Stock: 79280LT1017IN8#PBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the KA2903M is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-DIP (0.300", 7.62mm) through-hole packaging to ensure direct PCB footprint compatibility.

Functional Equivalence: All substitutes must provide dual-element comparator functionality with matching pin configurations.

Electrical Operating Range: Substitute parts must support the supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply) to maintain circuit operation across the original design specifications.

Input and Output Characteristics: Substitute parts must maintain input offset voltage specifications at or below 7mV and support comparable input bias current and output current ratings to ensure signal integrity and load-driving capability.

Temperature Range: Operating temperature specifications must encompass or exceed the -40°C to 85°C range of the original part.

The three identified substitute parts—LM2903P, LM393PE3, and LT1017IN8#PBF—all meet these core substitution criteria while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

LM2903P (Texas Instruments): This part provides direct electrical and functional equivalence to the KA2903M with identical supply voltage range and input bias current specifications. The LM2903P is actively manufactured and ROHS3 compliant, offering superior long-term availability. Operating temperature extends to 125°C, exceeding the original specification. This part is suitable for applications requiring standard performance characteristics and extended temperature operation.

LM393PE3 (Texas Instruments): This substitute offers improved input offset voltage performance (5mV maximum versus 7mV) while maintaining identical supply voltage and input bias current ratings. Operating temperature is limited to 0°C to 70°C, which is narrower than the original KA2903M specification. This part is ROHS3 compliant and actively produced. Selection of this part requires verification that the reduced temperature range accommodates the target application environment.

LT1017IN8#PBF (Analog Devices Inc.): This part provides the widest supply voltage range (1.1V to 40V single supply) and superior electrical performance characteristics, including lower input offset voltage (1mV), significantly lower input bias current (0.015µA), and higher output current capability (65mA). The LT1017IN8#PBF is actively manufactured, ROHS3 compliant, and maintains the original -40°C to 85°C operating temperature range. This part is suitable for applications requiring enhanced precision, lower power consumption, or higher output drive capability.

Frequently Asked Questions (FAQ)

Q: Can the LM2903P directly replace the KA2903M without PCB modifications?

A: Yes. Both parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging with matching pin configurations. No PCB layout changes are required for direct substitution.

Q: What is the primary difference between the LM2903P and LM393PE3?

A: Both parts are Texas Instruments comparators with identical supply voltage and input bias current specifications. The LM393PE3 offers lower input offset voltage (5mV versus 7mV) but operates within a narrower temperature range (0°C to 70°C versus -40°C to 125°C for the LM2903P). Selection depends on application temperature requirements.

Q: Why does the LT1017IN8#PBF have different quiescent current specifications?

A: The LT1017IN8#PBF is a different comparator architecture from Analog Devices with enhanced performance characteristics. The higher quiescent current (60µA maximum) reflects its superior precision and output drive capability. This part is suitable for applications where performance enhancement justifies increased power consumption.

Q: Are all substitute parts RoHS compliant?

A: Yes. The LM2903P, LM393PE3, and LT1017IN8#PBF are all ROHS3 compliant. The original KA2903M RoHS status is not specified in available documentation.

Q: Which substitute part offers the best performance for precision applications?

A: The LT1017IN8#PBF provides the lowest input offset voltage (1mV) and input bias current (0.015µA), making it the optimal choice for precision measurement and signal conditioning applications requiring high accuracy.

Q: Can the LM393PE3 be used in applications requiring -40°C operation?

A: No. The LM393PE3 operating temperature range is 0°C to 70°C. Applications requiring -40°C operation must use either the LM2903P or LT1017IN8#PBF.