LM393ST Equivalent & Substitute Parts

Part Overview

The LM393ST is a dual general-purpose comparator manufactured by Rohm Semiconductor in 8-MiniSO surface-mount packaging. This device features open-collector, rail-to-rail output configuration with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The LM393ST is classified as "Not For New Designs," indicating end-of-life status. Identifying equivalent and substitute parts is necessary for design continuity, production support, and long-term component availability.

Key Parameters

Parameter	Value
Manufacturer	Rohm Semiconductor
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-MiniSO
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	1mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM393ST is determined by the following critical parameters:

Package compatibility: 8-MiniSO, 8-MSOP, or equivalent 8-pin surface-mount packages with identical pinout
Output configuration: Open-Collector or Open-Collector with Rail-to-Rail capability
Supply voltage range: Minimum 2V to 36V single supply or ±1V to ±18V dual supply
Input offset voltage: Maximum 7mV @ 5V
Input bias current: Maximum 0.25µA @ 5V
Output current: Minimum 16mA @ 5V
Quiescent current: Maximum 1mA to 2.5mA acceptable
Operating temperature: Minimum 0°C to 70°C (extended range acceptable)
Compliance: ROHS3 compliant, MSL 1 or 2

Substitute parts are grouped into two categories: direct equivalents (identical electrical and package specifications) and functional equivalents (compatible electrical performance with minor parameter variations or different package options).

Parameter Comparison

Part Number	Manufacturer	Package	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Product Status
LM393ST	Rohm Semiconductor	8-MiniSO	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	0°C ~ 70°C	Not For New Designs
LM2903YST	STMicroelectronics	8-MiniSO	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2903DMR2G	onsemi	8-MSOP	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 105°C	Active
LM393DGKR	Rohm Semiconductor	8-MSOP/VSSOP	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	Not Specified	1mA	0°C ~ 70°C	Not For New Designs
LM393DMR2G	onsemi	8-MSOP	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Active
LM293ST	STMicroelectronics	8-MiniSO	Open-Collector, Open-Drain, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-40°C ~ 105°C	Active
LMV393MM/NOPB	Texas Instruments	8-VSSOP	CMOS, Open-Collector, TTL	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	Active
LMV393MMX/NOPB	Texas Instruments	8-VSSOP	CMOS, Open-Collector, TTL	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	Active
NJM2407R-TE1	Nisshinbo Micro Devices Inc.	8-VSP	Open-Collector	2V~20V, ±1V~10V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	Not Specified	-40°C ~ 85°C	Active
LMV393ID	Texas Instruments	8-SOIC	Open-Collector	2.7V~5.5V	7mV @ 5V	0.25µA @ 5V	84mA @ 5V	250µA	-40°C ~ 85°C	Last Time Buy

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended for New Designs)

LM2903YST (STMicroelectronics) and LM293ST (STMicroelectronics) are the primary recommended substitutes. Both maintain identical electrical specifications to the LM393ST with active product status and extended operating temperature ranges (-40°C to 125°C and -40°C to 105°C respectively). LM2903YST provides exact parameter matching in 8-MiniSO packaging. LM293ST offers improved input offset voltage (5mV vs 7mV) and slightly higher output current (18mA vs 16mA) in the same package.

Tier 2 - Functional Equivalents (Compatible with Design Review)

LM2903DMR2G and LM393DMR2G (onsemi) are active-status alternatives in 8-MSOP packaging. Both support the full supply voltage range and maintain critical electrical parameters. LM393DMR2G matches the original operating temperature range (0°C to 70°C) with improved input offset voltage (5mV @ 30V). These parts require PCB layout verification due to package differences.

Tier 3 - Limited Supply Range Substitutes

LMV393MM/NOPB and LMV393MMX/NOPB (Texas Instruments) restrict supply voltage to 2.7V to 5.5V, making them unsuitable for designs requiring the full 2V to 36V range. These parts are only applicable for 5V-centric applications. LMV393ID (Texas Instruments) carries Last Time Buy status and should be avoided for new designs.

Not Recommended

NJM2407R-TE1 (Nisshinbo) limits supply voltage to 2V to 20V (±1V to ±10V), reducing compatibility with 36V applications. LM393DGKR (Rohm) carries Not For New Designs status identical to the original part.

Frequently Asked Questions (FAQ)

Q: Can LM2903YST directly replace LM393ST without PCB modifications?

A: Yes. LM2903YST maintains identical 8-MiniSO packaging, pinout, and electrical specifications. No PCB layout changes are required. The primary difference is extended operating temperature range (-40°C to 125°C vs 0°C to 70°C) and active product status.

Q: What is the key limitation of LMV393 series parts?

A: LMV393 variants restrict supply voltage to 2.7V to 5.5V, incompatible with designs requiring operation at 2V minimum or above 5.5V. These parts are suitable only for standard 5V logic applications.

Q: Are onsemi LM2903DMR2G and LM393DMR2G interchangeable?

A: Both are functionally equivalent in 8-MSOP packaging with identical supply voltage ranges. LM393DMR2G matches the original 0°C to 70°C temperature range, while LM2903DMR2G extends to -40°C to 105°C. Package footprint is identical; verify PCB layout compatibility with 8-MSOP vs 8-MiniSO if transitioning from the original part.

Q: Why is NJM2407R-TE1 not recommended as a substitute?

A: NJM2407R-TE1 limits supply voltage to 2V to 20V (±1V to ±10V), failing to support the LM393ST's 36V maximum rating. This restriction makes it unsuitable for designs requiring full voltage range compatibility.

Q: What compliance certifications should I verify for automotive applications?

A: LM2903YST carries AEC-Q100 automotive qualification. All recommended substitutes maintain ROHS3 compliance and MSL 1 or 2 ratings. Verify specific automotive requirements with the component manufacturer before design release.

Q: Can I use LMV393ID as a substitute?

A: LMV393ID carries Last Time Buy status and should be avoided for new designs. Additionally, it restricts supply voltage to 2.7V to 5.5V and uses 8-SOIC packaging instead of 8-MiniSO, requiring PCB redesign.

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