KA393 Equivalent & Substitute Parts

Part Overview

The KA393 is a general-purpose dual comparator IC manufactured by onsemi in 8-DIP through-hole packaging. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The KA393 operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is suitable for applications requiring precision voltage comparison with low input offset voltage and minimal input bias current.

Substiute Parts

KA393

onsemiIn Stock: 1539KA393 Datasheet

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LM393DR2G

onsemiIn Stock: 205494LM393DR2G Datasheet

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LM393P

Texas InstrumentsIn Stock: 161918LM393P Datasheet

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LM393AP

Texas InstrumentsIn Stock: 4479LM393AP Datasheet

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LM393N/NOPB

Texas InstrumentsIn Stock: 89244LM393N/NOPB 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

Substitution of the KA393 is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be dual-element general-purpose comparators with identical pin configurations in 8-pin DIP packaging.

Electrical Compatibility: Supply voltage range (2V ~ 36V single, ±1V ~ ±18V dual), input offset voltage (5mV maximum), input bias current (0.25µA maximum), and quiescent current (2.5mA maximum) establish the baseline for functional substitution.

Package Compatibility: The KA393 uses 8-DIP through-hole packaging. Direct substitutes maintain this package type. The LM393DR2G represents a surface-mount alternative (8-SOIC) suitable only for designs with SMD capability.

Output Configuration: The KA393 does not specify output type. Substitute parts with open-collector, rail-to-rail, or pull-up outputs are functionally compatible provided they meet the electrical parameter requirements.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to ensure regulatory continuity.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Through-Hole 8-DIP): The LM393P, LM393AP, LM393N/NOPB, and LM393PE3 from Texas Instruments are direct pin-compatible replacements for the KA393. All maintain identical package geometry, supply voltage ranges, and core electrical specifications. These parts are in active production status, ensuring long-term availability and supply chain continuity. Selection among these variants depends on specific application requirements for input offset voltage precision (LM393AP offers 2mV maximum) and output current capability.

Extended Temperature Range Alternative: The LT1017IN8#PBF from Analog Devices Inc. provides superior electrical performance with lower input offset voltage (1mV), significantly lower input bias current (0.015µA), and extended operating temperature range (-40°C to 85°C). This part is suitable for applications requiring enhanced precision or operation beyond the standard 0°C to 70°C range. Higher quiescent current (60µA) and output current (65mA) may impact power budget calculations.

Surface-Mount Alternative: The LM393DR2G in 8-SOIC packaging provides electrical equivalence for designs utilizing surface-mount assembly processes. This part maintains all core electrical specifications and active product status but requires PCB redesign for SMD compatibility.

Compliance Continuity: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original KA393 specification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace KA393 with LM393P in my existing PCB?

A: Yes. The LM393P is pin-compatible with the KA393 in 8-DIP through-hole packaging. No PCB modifications are required. Both parts share identical pin assignments and electrical operating ranges.

Q: What is the difference between LM393P, LM393AP, and LM393N/NOPB?

A: All three are functionally equivalent dual comparators in 8-DIP packaging from Texas Instruments. The LM393AP offers tighter input offset voltage specification (2mV maximum versus 5mV). The LM393N/NOPB specifies propagation delay at 700ns maximum. Selection depends on application-specific precision requirements.

Q: Why does LT1017IN8#PBF have different electrical specifications?

A: The LT1017IN8#PBF is a higher-performance comparator from Analog Devices Inc. with superior input offset voltage (1mV), lower input bias current (0.015µA), and extended temperature range (-40°C to 85°C). These enhancements come with higher quiescent current (60µA) and output current (65mA). Use this part only when enhanced performance justifies the increased power consumption.

Q: Can I use LM393DR2G as a substitute?

A: The LM393DR2G is electrically equivalent but uses 8-SOIC surface-mount packaging instead of through-hole 8-DIP. This part requires PCB redesign and SMD assembly capability. Use only if your manufacturing process supports surface-mount technology.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original KA393.

Q: What supply voltage range should I verify for my application?

A: All primary substitutes (LM393 variants) support 2V to 36V single supply or ±1V to ±18V dual supply, identical to the KA393. The LT1017IN8#PBF extends this to 1.1V to 40V single supply or ±0.55V to ±20V dual supply. Verify your circuit design operates within these ranges.

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

A: The LT1017IN8#PBF provides the lowest input offset voltage at 1mV maximum. Among the LM393 variants, the LM393AP offers 2mV maximum, while others specify 5mV maximum.