LM393AMX Equivalent & Substitute Parts

Part Overview

The LM393AMX is a dual general-purpose comparator manufactured by onsemi in 8-SOIC surface-mount packaging. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is designed for general-purpose comparison applications. The LM393AMX is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM393AMX
Manufacturer	onsemi
Category	Linear
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Elements	2
Type	General Purpose
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	2mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	18mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM393AMX is determined by the following critical parameters:

Package compatibility: 8-SOIC surface-mount form factor (0.154", 3.90mm width)
Dual comparator configuration: 2 independent comparator elements
Supply voltage range: 2V to 36V single supply or ±1V to ±18V dual supply
Input offset voltage: Maximum 2mV to 7mV at specified test conditions
Input bias current: Maximum 0.25µA at 5V
Output current capability: 16mA to 18mA typical at 5V
Quiescent current: Maximum 2.5mA
Output type: Open-Collector or Open-Collector/Rail-to-Rail configurations
Operating temperature range: Minimum 0°C lower bound, maximum 70°C to 125°C upper bound
Compliance: ROHS3 compliant, MSL 1

Substitute parts must maintain electrical compatibility within these parameters while offering active product status for procurement availability.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Type	Operating Temp	Status
LM393AMX	onsemi	8-SOIC	2V~36V, ±1V~18V	2mV @ 5V	0.25µA @ 5V	Open-Collector	0°C ~ 70°C	Obsolete
LM393DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	Open-Collector, Rail-to-Rail	0°C ~ 70°C	Active
LM2903DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	Open-Collector, Rail-to-Rail	-40°C ~ 105°C	Active
LM2903VDR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	Open-Collector, Rail-to-Rail	-40°C ~ 125°C	Active
LM293DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	Open-Collector, Open-Drain, Rail-to-Rail	-25°C ~ 85°C	Active
NCV2903DR2G	onsemi	8-SOIC	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	CMOS, DTL, ECL, MOS, Open-Collector, TTL	-40°C ~ 125°C	Active
LM393ADR	UMW	8-SOIC	2V~36V, ±1V~18V	5mV	250nA	Open-Collector, Rail-to-Rail	0°C ~ 70°C	Active
BA10393F-E2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	Open-Collector	-40°C ~ 85°C	Active
BA2903SF-E2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	Open-Collector	-40°C ~ 105°C	Active
BA2903YF-CE2	Rohm Semiconductor	8-SOIC	2V~36V, ±1V~18V	4mV @ 5V	0.25µA @ 5V	Open-Collector	-40°C ~ 125°C	Active
LM193DR	UMW	8-SOIC	2V~32V, ±1V~16V	5mV	250nA	Open-Collector, Rail-to-Rail	-55°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Recommendation: LM393DR2G (onsemi)

LM393DR2G is the direct active equivalent from the original manufacturer onsemi. It maintains identical package geometry (8-SOIC, 0.154" width), supply voltage range (2V to 36V single, ±1V to ±18V dual), and operating temperature lower bound (0°C). Input offset voltage increases from 2mV to 5mV at 30V, remaining within acceptable general-purpose comparator tolerances. This part carries active product status and ROHS3 compliance, ensuring long-term procurement availability.

Secondary Recommendation: LM2903DR2G or LM2903VDR2G (onsemi)

Both LM2903 variants from onsemi provide extended operating temperature ranges (-40°C to 105°C or -40°C to 125°C) while maintaining the same package, supply voltage, and electrical performance envelope. These parts are suitable for applications requiring wider temperature operation. LM2903VDR2G extends the upper temperature limit to 125°C.

Alternative Recommendation: BA2903YF-CE2 (Rohm Semiconductor)

BA2903YF-CE2 offers the lowest input offset voltage (4mV @ 5V) among available substitutes and includes automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C to 125°C). This part is appropriate for precision applications and automotive environments.

Cross-Manufacturer Option: LM393ADR (UMW)

LM393ADR from UMW provides a direct LM393 base product number match with active status. It maintains the 0°C to 70°C operating range and identical supply voltage specifications. This option ensures compatibility with designs specifically qualified to the LM393 product line.

Frequently Asked Questions (FAQ)

Q: Can LM393DR2G directly replace LM393AMX in existing designs?

A: Yes. LM393DR2G maintains identical package geometry (8-SOIC, 0.154" width), supply voltage range (2V to 36V single, ±1V to ±18V dual), and operating temperature lower bound (0°C). The input offset voltage specification increases from 2mV to 5mV, which remains acceptable for general-purpose comparator applications. No circuit modifications are required.

Q: What is the difference between LM2903DR2G and LM2903VDR2G?

A: Both parts are electrically identical dual comparators in 8-SOIC packaging with identical supply voltage and input specifications. The primary difference is operating temperature range: LM2903DR2G operates from -40°C to 105°C, while LM2903VDR2G extends to -40°C to 125°C. Select LM2903VDR2G for applications requiring operation at temperatures above 105°C.

Q: Why does LM193DR show a lower supply voltage range (2V to 32V) compared to LM393AMX (2V to 36V)?

A: LM193DR is specified with a maximum supply voltage of 32V single supply (±1V to ±16V dual supply), which is 4V lower than the LM393AMX specification. This part is not recommended as a direct substitute if the design requires operation at 33V to 36V supply levels.

Q: Is NCV2903DR2G suitable for non-automotive applications?

A: NCV2903DR2G is an automotive-grade part (AEC-Q100 qualified) with extended temperature range (-40°C to 125°C). While it exceeds the requirements of general industrial applications, it can be used in non-automotive designs. Automotive-grade components typically carry higher cost; evaluate whether the extended specifications justify the expense for your application.

Q: What is the significance of "Open-Collector, Rail-to-Rail" output type?

A: Open-Collector output allows the comparator output to sink current to ground through an internal transistor, requiring an external pull-up resistor. Rail-to-Rail capability means the output can swing from ground to the positive supply rail. This configuration provides flexibility in interfacing with different logic families and voltage levels.

Q: Can I use BA2903YF-CE2 in place of LM393AMX?

A: Yes, with the following considerations: BA2903YF-CE2 is manufactured by Rohm Semiconductor (not onsemi) and includes automotive-grade qualification. It offers superior input offset voltage (4mV @ 5V) and extended temperature range (-40°C to 125°C). The 8-SOIC package is compatible. This substitution is appropriate if your design can accommodate a different manufacturer and does not require the exact 0°C lower temperature bound.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level, meaning the component can be stored indefinitely without special moisture-control packaging. Both the LM393AMX and all listed substitute parts carry MSL 1 classification, ensuring identical moisture handling requirements.

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