KA393A Equivalent & Substitute Parts

Part Overview

The KA393A 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 KA393A 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 dual-channel functionality.

Substiute Parts

KA393A

onsemiIn Stock: 1443KA393A Datasheet

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LM393DR2G

onsemiIn Stock: 205494LM393DR2G Datasheet

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LM393AP

Texas InstrumentsIn Stock: 4479LM393AP Datasheet

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LM393P

Texas InstrumentsIn Stock: 161918LM393P 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 KA393A is determined by the following critical parameters:

• Dual-channel comparator architecture (2 elements required)
• Supply voltage compatibility (2V ~ 36V single supply minimum)
• Input offset voltage (≤ 5mV @ 30V acceptable)
• Input bias current (≤ 0.25µA @ 5V)
• Quiescent current (≤ 2.5mA)
• Operating temperature range (0°C ~ 70°C minimum)
• RoHS3 compliance (regulatory requirement)

Substitute parts are grouped into two categories:

Category 1: Through-Hole DIP Packaging (Direct Pin-Compatible)

• LM393AP (Texas Instruments)
• LM393P (Texas Instruments)
• LM393PE3 (Texas Instruments)
• LT1017IN8#PBF (Analog Devices Inc.)

Category 2: Surface-Mount Alternative

• LM393DR2G (onsemi) — 8-SOIC package, requires PCB redesign

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Recommended):

LM393AP, LM393P, and LM393PE3 from Texas Instruments are functionally equivalent to the KA393A. All three maintain 8-DIP through-hole packaging, identical pin configuration, and meet the same supply voltage and quiescent current specifications. These parts are in active production status with substantial inventory availability. Selection among these three variants depends on packaging format preference (Tube) and volume requirements.

For Enhanced Performance:

LT1017IN8#PBF from Analog Devices Inc. offers superior electrical characteristics including lower input offset voltage (1mV), significantly lower input bias current (0.015µA), and extended operating temperature range (-40°C to 85°C). This part maintains 8-DIP through-hole compatibility and is suitable for applications requiring tighter precision or wider temperature operation. Quiescent current is higher at 60µA, which may impact low-power applications.

For Surface-Mount Applications:

LM393DR2G from onsemi provides an 8-SOIC surface-mount alternative with equivalent electrical performance to the KA393A. This substitution requires PCB layout redesign and is suitable only for new designs or board revisions. Output type differs (Open-Collector, Rail-to-Rail) compared to the KA393A specification.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the KA393A.

Frequently Asked Questions (FAQ)

Q: Can LM393AP, LM393P, and LM393PE3 be used interchangeably with KA393A?

A: Yes. All three Texas Instruments parts are pin-compatible replacements with identical 8-DIP packaging, matching supply voltage ranges (2V ~ 36V, ±1V ~ 18V), and equivalent quiescent current specifications (2.5mA max). Input offset voltage specifications differ slightly (2mV to 5mV @ 30V), but remain within acceptable tolerance for general-purpose comparator applications.

Q: What is the key difference between LM393DR2G and the through-hole alternatives?

A: LM393DR2G uses 8-SOIC surface-mount packaging instead of 8-DIP through-hole. This requires PCB redesign and is not a direct pin-compatible replacement. It is suitable only for new designs or board revisions where surface-mount technology is preferred.

Q: Is LT1017IN8#PBF a suitable replacement for all KA393A applications?

A: LT1017IN8#PBF is pin-compatible and meets all critical electrical parameters. However, quiescent current is significantly higher (60µA vs. 2.5mA), which may impact battery-powered or ultra-low-power applications. Extended temperature range (-40°C to 85°C) makes it suitable for industrial and automotive environments beyond the KA393A specification (0°C to 70°C).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (LM393AP, LM393P, LM393PE3, LM393DR2G, and LT1017IN8#PBF) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the KA393A.

Q: Which substitute part has the lowest input offset voltage?

A: LT1017IN8#PBF offers the lowest input offset voltage at 1mV @ ±20V, compared to 2mV @ 5V for the KA393A and 2mV to 5mV @ 30V for the Texas Instruments alternatives. This makes it suitable for precision comparison applications.

Q: Can I use these substitutes in existing PCB designs without modification?

A: LM393AP, LM393P, LM393PE3, and LT1017IN8#PBF maintain identical 8-DIP through-hole pin configuration and can be used as direct replacements without PCB modification. LM393DR2G requires PCB redesign due to 8-SOIC surface-mount packaging.