LM393AN Equivalent & Substitute Parts

Part Overview

The LM393AN is a general-purpose dual comparator IC manufactured by onsemi in 8-DIP through-hole packaging. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is designed for applications requiring precision voltage comparison. The LM393AN is currently listed as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts maintain functional compatibility while offering improved availability and, in many cases, enhanced specifications or active product status.

Substiute Parts

LM393AN

onsemiIn Stock: 2015LM393AN Datasheet

Current PartRFQ

LM393AP

Texas InstrumentsIn Stock: 4479LM393AP Datasheet

DirectRFQ

AS393P-E1

Diodes IncorporatedIn Stock: 40236AS393P-E1 Datasheet

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LM2903QS-13

Diodes IncorporatedIn Stock: 25020LM2903QS-13 Datasheet

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LM2903S-13

Diodes IncorporatedIn Stock: 5328LM2903S-13 Datasheet

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LM293MDREP

Texas InstrumentsIn Stock: 4327LM293MDREP Datasheet

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LM393P

Texas InstrumentsIn Stock: 161918LM393P 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 LM393AN are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Number of Elements: 2 (all substitutes maintain dual comparator configuration)
• Type: General Purpose
• Voltage - Supply, Single/Dual (±): 2V ~ 36V, ±1V ~ 18V (all substitutes support this range)
• Current - Input Bias (Max): 0.25µA @ 5V (consistent across all options)
• Package compatibility: 8-DIP through-hole or 8-SOIC surface-mount variants

Grouping Logic:

Group 1 - Direct DIP Package Equivalents (Pin-Compatible): LM393AP, LM393P, and AS393P-E1 maintain the 8-DIP through-hole package, enabling direct socket replacement without PCB redesign.

Group 2 - Surface-Mount Alternatives (Package Change Required): LM2903QS-13, LM2903S-13, and LM293MDREP use 8-SOIC surface-mount packaging, requiring PCB layout modification but offering improved thermal characteristics and automated assembly compatibility.

Group 3 - Enhanced Performance Option: LT1017IN8#PBF provides superior electrical specifications (lower input offset voltage, lower input bias current, higher output current capability) while maintaining 8-DIP through-hole packaging, suitable for applications requiring tighter tolerances.

Parameter Comparison

Engineering Selection Recommendations

For Direct Socket Replacement (Through-Hole DIP Package):

LM393P (Texas Instruments) is the primary recommendation for direct substitution. It maintains identical 8-DIP through-hole packaging, operates across the same supply voltage range, and is in active production status with ROHS3 compliance. Current inventory of 161,820 units ensures long-term availability.

LM393AP (Texas Instruments) provides an alternative with identical electrical specifications and packaging, suitable for applications where tube packaging is preferred over bulk quantities.

AS393P-E1 (Diodes Incorporated) offers extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and lower quiescent current (1mA versus 2.5mA), beneficial for battery-powered or temperature-critical applications. This part maintains pin-compatible 8-DIP packaging.

For Surface-Mount Conversion:

LM2903QS-13 (Diodes Incorporated) is suitable for new PCB designs requiring surface-mount technology. It extends operating temperature to -125°C and includes AEC-Q100 automotive qualification. The 8-SOIC package reduces board footprint and improves thermal performance.

LM293MDREP (Texas Instruments) provides the widest operating temperature range (-55°C to 125°C) in surface-mount format, with enhanced output current capability (20mA typical). This option is appropriate for industrial and military-grade applications.

For Enhanced Performance Requirements:

LT1017IN8#PBF (Analog Devices Inc.) delivers superior electrical characteristics: input offset voltage of 1mV (versus 2-7mV in alternatives), input bias current of 0.015µA (versus 0.25µA), and output current of 65mA (versus 16-20mA). Extended supply voltage range (1.1V to 40V) and lower quiescent current (60µA) make this suitable for precision measurement and low-power applications. Through-hole 8-DIP packaging enables direct replacement.

Compliance and Regulatory Considerations:

All active substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting modern environmental and regulatory requirements. The LM393AN's obsolete status necessitates transition to active alternatives for new designs and long-term production support.

Frequently Asked Questions (FAQ)

Q: Can LM393P be used as a direct replacement for LM393AN?

A: Yes. Both devices use 8-DIP through-hole packaging, operate across 2V to 36V single supply (±1V to ±18V dual supply), and maintain identical pin configuration. LM393P is in active production with superior availability and ROHS3 compliance.

Q: What is the difference between LM393AP and LM393P?

A: Both are Texas Instruments LM393 variants with identical electrical specifications and 8-DIP packaging. The primary difference is packaging format: LM393AP is supplied in tube packaging, while LM393P is supplied in tube format as well. Both are suitable for direct substitution.

Q: Can surface-mount alternatives like LM2903QS-13 replace the through-hole LM393AN?

A: Electrically, yes. LM2903QS-13 maintains the same supply voltage range, input bias current, and dual-comparator configuration. However, the 8-SOIC surface-mount package requires PCB redesign and automated assembly equipment. This substitution is appropriate only for new designs or PCB revisions.

Q: Why does AS393P-E1 have lower quiescent current than LM393AN?

A: AS393P-E1 is manufactured by Diodes Incorporated with different internal design optimization, resulting in 1mA quiescent current versus 2.5mA for LM393AN. This lower power consumption is beneficial for battery-powered applications while maintaining functional compatibility.

Q: Is LT1017IN8#PBF a suitable replacement for cost-sensitive applications?

A: LT1017IN8#PBF offers superior performance specifications (lower offset voltage, lower bias current, higher output current) but typically commands a higher unit cost than standard LM393 variants. This part is appropriate for precision applications where performance justifies the cost premium, not for cost-sensitive designs.

Q: What is the operating temperature difference between LM393AN and AS393P-E1?

A: LM393AN operates from 0°C to 70°C, while AS393P-E1 extends to -40°C to 85°C. For applications requiring operation below 0°C or above 70°C, AS393P-E1 is the appropriate through-hole DIP alternative.

Q: Can LM2903S-13 be used instead of LM2903QS-13?

A: Both are Diodes Incorporated LM2903 variants in 8-SOIC surface-mount packaging with identical electrical specifications. LM2903S-13 has MSL-3 moisture sensitivity (168 hours) versus MSL-1 for LM2903QS-13. For standard applications, either part is acceptable; for high-humidity or extended storage environments, LM2903QS-13 is preferred.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed are ROHS3 compliant, meeting modern environmental and regulatory standards required by most OEMs and end-use markets.