LM393MX Equivalent & Substitute Parts

Part Overview

The LM393MX is a general-purpose dual comparator IC manufactured by onsemi in 8-SOIC surface-mount packaging. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with a maximum input offset voltage of 5mV at 5V and typical output current of 18mA at 5V. The LM393MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Functionally compatible alternatives are available from multiple manufacturers with active product status and enhanced specifications.

Key Parameters

Parameter	LM393MX Value
Manufacturer	onsemi
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Type	General Purpose
Number of Elements	2
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 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

Substitute Part Grouping Explanation

Substitution eligibility for the LM393MX is determined by the following critical parameters:

Package compatibility: 8-SOIC surface-mount form factor (0.154" width, 3.90mm)
Electrical specifications: Dual comparator configuration with 2V to 36V single-supply or ±1V to ±18V dual-supply operation
Input offset voltage: Maximum 5mV at 5V
Input bias current: Maximum 0.25µA at 5V
Output current capability: Minimum 16mA at 5V
Quiescent current: Maximum 2.5mA
Operating temperature range: Minimum coverage of 0°C to 70°C

Substitute parts are grouped into two categories:

Direct Equivalents (onsemi LM393 Series): Parts maintaining identical electrical characteristics and output type specifications with active product status.

Cross-Manufacturer Alternatives (Diodes, Rohm, STMicroelectronics, UMW): Parts meeting or exceeding all critical electrical parameters with compatible packaging, offering extended temperature ranges, improved compliance certifications, and active production status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Output Type	Voltage Supply	Input Offset (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	RoHS Status
LM393MX	onsemi	Obsolete	8-SOIC (3.90mm)	—	2V~36V, ±1V~18V	5mV @ 5V	18mA @ 5V	2.5mA	0°C ~ 70°C	—
LM393DR2G	onsemi	Active	8-SOIC (3.90mm)	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3 Compliant
AS393AMTR-E1	Diodes Incorporated	Active	8-SOIC (3.90mm)	Open-Collector	2V~36V, ±1V~18V	3mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	ROHS3 Compliant
AS393MTR-E1	Diodes Incorporated	Active	8-SOIC (3.90mm)	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	ROHS3 Compliant
AS393MTR-G1	Diodes Incorporated	Active	8-SOIC (3.90mm)	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	ROHS3 Compliant
BA10393F-E2	Rohm Semiconductor	Active	8-SOP (4.40mm)	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	ROHS3 Compliant
BA2903SF-E2	Rohm Semiconductor	Active	8-SOP (4.40mm)	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	16mA @ 5V	1mA	-40°C ~ 105°C	ROHS3 Compliant
BA2903YF-CE2	Rohm Semiconductor	Active	8-SOP (4.40mm)	Open-Collector	2V~36V, ±1V~18V	4mV @ 5V	16mA @ 5V	1mA	-40°C ~ 125°C	ROHS3 Compliant
LM193DT	STMicroelectronics	Active	8-SOIC (3.90mm)	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	18mA @ 5V	2.5mA	-55°C ~ 125°C	ROHS3 Compliant
LM2903D	STMicroelectronics	Active	8-SOIC (3.90mm)	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	ROHS3 Compliant
LM2903DR	UMW	Active	8-SOP (3.90mm)	Open-Collector, Rail-to-Rail	2V~30V, ±1V~±15V	5mV @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM193DT (STMicroelectronics) provides the closest functional match to the LM393MX with identical electrical performance (18mA output current, 2.5mA quiescent current), identical 8-SOIC packaging, and extended operating temperature range (-55°C to 125°C). ROHS3 compliance and active product status ensure long-term availability and regulatory compliance.

Alternative for Standard Temperature Range: LM393DR2G (onsemi) maintains the original manufacturer lineage with active status, identical supply voltage specifications, and ROHS3 compliance. Suitable for applications within 0°C to 70°C operating range.

Extended Temperature Applications: BA2903YF-CE2 (Rohm Semiconductor) supports -40°C to 125°C operation with AEC-Q100 automotive qualification, appropriate for automotive and industrial environments requiring extended temperature performance.

Cost-Optimized Alternatives: AS393MTR-E1 and AS393MTR-G1 (Diodes Incorporated) offer reduced quiescent current (1mA versus 2.5mA) and extended temperature range (-40°C to 85°C) with active production status and ROHS3 compliance.

All recommended substitutes maintain the critical dual-comparator configuration, 8-SOIC surface-mount packaging, and supply voltage specifications required for direct replacement in existing designs.

Frequently Asked Questions (FAQ)

Q: Can LM393MX be directly replaced with LM393DR2G?

A: Yes. Both devices share identical electrical specifications, supply voltage range (2V to 36V single, ±1V to ±18V dual), input offset voltage (5mV @ 5V), and 8-SOIC packaging. LM393DR2G is the active production equivalent with ROHS3 compliance.

Q: What is the difference between 8-SOIC (3.90mm) and 8-SOP (4.40mm) packages?

A: Both are surface-mount 8-pin packages with identical pin configurations and electrical compatibility. The 8-SOP variant has a wider body (4.40mm versus 3.90mm). PCB layout modifications may be required for parts using the wider 8-SOP package (BA10393F-E2, BA2903SF-E2, BA2903YF-CE2).

Q: Which substitute offers the best temperature performance?

A: BA2903YF-CE2 (Rohm Semiconductor) operates from -40°C to 125°C with AEC-Q100 automotive qualification. LM193DT (STMicroelectronics) provides -55°C to 125°C range without automotive qualification.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting regulatory requirements for new designs.

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

A: Open-collector output allows external pull-up resistor configuration for flexible logic level interfacing. Rail-to-rail capability indicates output voltage can swing to both supply rails, maximizing output voltage swing. The LM393MX output type is not specified; substitutes with these features provide enhanced functionality while maintaining backward compatibility.

Q: Can LM2903DR (UMW) replace LM393MX?

A: LM2903DR meets electrical specifications but has a reduced maximum supply voltage of 2V to 30V (versus 2V to 36V) and dual supply of ±1V to ±15V (versus ±1V to ±18V). Use only if your application operates within these reduced voltage limits.

Q: What is the impact of quiescent current differences?

A: LM393MX and LM193DT specify 2.5mA maximum quiescent current. Diodes Incorporated parts (AS393 series) specify 1mA, reducing power consumption in battery-powered applications. This difference does not affect functional compatibility.

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