LM393N Equivalent & Substitute Parts

Part Overview

The LM393N is a general-purpose dual comparator IC manufactured by onsemi in 8-DIP through-hole packaging. This device is classified as obsolete, though it remains in stock with 15,433 units available. The LM393N operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is suitable for applications requiring low-power voltage comparison and signal conditioning.

Due to its obsolete status, identifying functionally equivalent and direct substitute parts is essential for design continuity, long-term availability assurance, and supply chain planning. Active alternatives from multiple manufacturers provide equivalent or enhanced performance characteristics while maintaining pin compatibility and electrical specifications.

Substiute Parts

LM393N

onsemiIn Stock: 15532LM393N Datasheet

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LM393DR2G

onsemiIn Stock: 205494LM393DR2G Datasheet

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LM393N/NOPB

Texas InstrumentsIn Stock: 89244LM393N/NOPB Datasheet

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LM393P

Texas InstrumentsIn Stock: 161918LM393P Datasheet

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AS393P-E1

Diodes IncorporatedIn Stock: 40236AS393P-E1 Datasheet

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LM2903P

Texas InstrumentsIn Stock: 22619LM2903P Datasheet

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LM393AP

Texas InstrumentsIn Stock: 4479LM393AP 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 eligibility for the LM393N is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Package / Case: 8-DIP (0.300", 7.62mm) for through-hole mounting
• Number of Elements: 2 comparators
• Voltage - Supply, Single/Dual (±): 2V ~ 36V, ±1V ~ 18V range
• Current - Input Bias (Max): 0.25µA @ 5V
• Current - Quiescent (Max): 2.5mA or lower
• Operating Temperature: Minimum 0°C ~ 70°C coverage
• RoHS Status: ROHS3 Compliant

Acceptable Variation Parameters:

• Voltage - Input Offset (Max): Up to 7mV @ 30V
• Current - Output (Typ): 16mA to 20mA @ 5V
• Output Type: Open-Collector, Rail-to-Rail, or Pull Up configurations
• Product Status: Active preferred for long-term availability

All substitute parts listed maintain the 8-DIP through-hole package form factor and dual-element comparator architecture, ensuring direct pin compatibility and PCB layout compatibility with existing LM393N designs.

Parameter Comparison

Engineering Selection Recommendations

Direct Pin-Compatible Through-Hole Substitutes (8-DIP Package):

The following parts provide direct pin compatibility and can be used as drop-in replacements for the LM393N in through-hole PCB designs:

• LM393N/NOPB (Texas Instruments): Active product status with identical package and electrical specifications. Recommended for immediate replacement in new designs and production runs.
• LM393P (Texas Instruments): Active product with 8-DIP through-hole package. Suitable for applications where higher output current (20mA typical) is beneficial.
• LM393AP (Texas Instruments): Active product with superior input offset voltage specification (2mV @ 30V). Recommended for precision comparison applications.
• AS393P-E1 (Diodes Incorporated): Active product with extended operating temperature range (-40°C to 85°C) and lower quiescent current (1mA). Suitable for temperature-critical or power-constrained applications.

Enhanced Performance Alternatives:

• LM2903P (Texas Instruments): Active product with extended operating temperature range (-40°C to 125°C). Suitable for industrial and automotive applications requiring wider temperature coverage.
• LT1017IN8#PBF (Analog Devices Inc.): Active product with superior electrical performance including lower input bias current (0.015µA), lower input offset voltage (1mV), and higher output current capability (65mA). Recommended for precision and high-performance applications. Extended supply voltage range (1.1V to 40V) provides additional design flexibility.

Surface-Mount Alternative:

• LM393DR2G (onsemi): Active product in 8-SOIC surface-mount package. Suitable for new PCB designs utilizing surface-mount assembly processes. Electrical specifications match the LM393N requirements.

All recommended substitutes maintain ROHS3 compliance and REACH compliance status, ensuring regulatory alignment with the original LM393N.

Frequently Asked Questions (FAQ)

Q: Can I use LM393DR2G as a substitute if my PCB is designed for through-hole components?

A: No. The LM393DR2G uses 8-SOIC surface-mount packaging, which is physically and mechanically incompatible with through-hole PCB designs. It requires surface-mount assembly and cannot be installed in DIP sockets. For through-hole designs, select from the 8-DIP package alternatives listed.

Q: What is the difference between LM393P and LM393AP?

A: Both are Texas Instruments products in 8-DIP through-hole packaging with identical supply voltage ranges and quiescent current specifications. The primary difference is input offset voltage: LM393AP specifies 2mV @ 30V compared to LM393P at 5mV @ 30V. For applications requiring tighter input offset voltage tolerance, LM393AP is the preferred selection.

Q: Is LT1017IN8#PBF a direct replacement for LM393N?

A: LT1017IN8#PBF is pin-compatible and functionally equivalent but offers enhanced performance characteristics. It features lower input bias current (0.015µA vs. 0.25µA), lower input offset voltage (1mV vs. 5mV), and higher output current capability (65mA vs. 18mA). It operates across a wider supply voltage range (1.1V to 40V vs. 2V to 36V). These improvements make it suitable as a direct replacement, particularly in precision applications, though component cost may be higher.

Q: Why does AS393P-E1 have a lower quiescent current specification?

A: AS393P-E1 from Diodes Incorporated specifies 1mA maximum quiescent current compared to 2.5mA for the LM393N. This represents a design characteristic of the Diodes Incorporated comparator architecture and makes AS393P-E1 advantageous for battery-powered or power-constrained applications where reduced standby current consumption is beneficial.

Q: Can I use LM2903P in applications requiring 0°C to 70°C operation?

A: Yes. LM2903P specifies an operating temperature range of -40°C to 125°C, which encompasses the 0°C to 70°C requirement of the LM393N. However, LM2903P is a different base product number (LM2903 vs. LM393), and while functionally equivalent, it should be verified against specific application requirements before deployment.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance status, ensuring regulatory alignment with environmental and hazardous substance restrictions applicable to the original LM393N.

Q: What packaging options are available for new designs?

A: For through-hole PCB designs, all 8-DIP package alternatives (LM393N/NOPB, LM393P, LM393AP, AS393P-E1, LM2903P, LT1017IN8#PBF) are available. For surface-mount PCB designs, LM393DR2G in 8-SOIC packaging is available. Selection depends on assembly process capability and PCB design requirements.