KA2903 Equivalent & Substitute Parts

Part Overview

The KA2903 is a differential comparator IC in 8-DIP packaging manufactured by onsemi. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The KA2903 provides dual differential comparison functionality suitable for general-purpose analog signal processing applications. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

KA2903

onsemiIn Stock: 2936KA2903 Datasheet

Current PartRFQ

LM2903P

Texas InstrumentsIn Stock: 22619LM2903P Datasheet

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LM393PE3

Texas InstrumentsIn Stock: 33664LM393PE3 Datasheet

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LT1017IN8#PBF

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

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KA2903 are qualified based on the following critical parameters:

• Package compatibility: 8-DIP (0.300", 7.62mm) through-hole mounting
• Dual comparator configuration: 2 independent elements
• Supply voltage range: 2V ~ 36V single supply or ±1V ~ 18V dual supply
• Input offset voltage: maximum 7mV
• Input bias current: maximum 0.25µA
• Quiescent current: maximum 2.5mA
• Operating temperature range: minimum -40°C ~ 85°C

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional equivalence in applications designed for the KA2903.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—LM2903P, LM393PE3, and LT1017IN8#PBF—are active products with current manufacturing status, addressing the obsolescence of the KA2903. Selection among these alternatives depends on specific application requirements:

LM2903P and LM393PE3 maintain identical supply voltage ranges and quiescent current specifications as the KA2903, providing direct functional replacement. Both are ROHS3 compliant and actively manufactured by Texas Instruments.

LT1017IN8#PBF, manufactured by Analog Devices Inc., offers superior electrical performance with lower input offset voltage (1mV), significantly lower input bias current (0.015µA), and higher output current capability (65mA). This device supports an extended supply voltage range (1.1V ~ 40V) and is ROHS3 compliant. However, quiescent current is higher at 60µA maximum.

For applications requiring extended temperature operation beyond 85°C, LM2903P supports -40°C ~ 125°C. For applications limited to 0°C ~ 70°C, LM393PE3 is suitable.

Frequently Asked Questions (FAQ)

Q: Can LM2903P directly replace KA2903 in existing designs? A: Yes. LM2903P maintains identical supply voltage ranges (2V ~ 36V, ±1V ~ 18V), input offset voltage (7mV), input bias current (0.25µA), and quiescent current (2.5mA) specifications. Package and pinout are identical 8-DIP through-hole. The primary difference is extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C).

Q: What are the key differences between LM393PE3 and LM2903P? A: Both devices share identical electrical specifications and package format. LM393PE3 operates within a narrower temperature range (0°C ~ 70°C) compared to LM2903P (-40°C ~ 125°C). Select LM393PE3 only for applications within this temperature window.

Q: Is LT1017IN8#PBF a suitable replacement for KA2903? A: LT1017IN8#PBF is functionally compatible in 8-DIP package and dual comparator configuration. It exceeds KA2903 specifications in input offset voltage (1mV vs. 7mV) and input bias current (0.015µA vs. 0.25µA). However, quiescent current is significantly higher (60µA vs. 2.5mA), which may impact power consumption in battery-powered applications. Verify power budget compatibility before selection.

Q: Are all substitute parts RoHS compliant? A: LM2903P, LM393PE3, and LT1017IN8#PBF are all ROHS3 compliant. All four parts (including KA2903) maintain REACH Unaffected status.

Q: What output type differences exist among these comparators? A: KA2903 output type is not specified in available documentation. LM2903P and LM393PE3 feature open-collector, rail-to-rail outputs. LT1017IN8#PBF features pull-up output configuration. Verify output stage compatibility with existing circuit design before substitution.

Q: Can these parts be used interchangeably in the same PCB layout? A: Yes. All substitute parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging with standard pinout compatibility. No PCB layout modifications are required.