LM393PT Equivalent & Substitute Parts

Part Overview

The LM393PT is a dual general-purpose comparator IC manufactured by Rohm Semiconductor in 8-TSSOP 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 LM393PT is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	LM393PT Specification
Manufacturer	Rohm Semiconductor
Package / Case	8-TSSOP (0.173", 4.40mm Width)
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM393PT is determined by the following critical parameters:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
Open-collector output type
Supply voltage range: 2V ~ 36V single / ±1V ~ ±18V dual
Input offset voltage: 7mV @ 5V maximum
Input bias current: 0.25µA @ 5V maximum
Output current: 16mA @ 5V typical
Quiescent current: 1mA maximum

Mechanical Compatibility Requirements:

Surface-mount packaging
8-pin configuration
Pin-compatible footprint (8-TSSOP or equivalent 8-pin SOIC)

Compliance Requirements:

ROHS3 compliant
MSL rating of 1 or 3 (168 Hours)

Substitute parts are grouped into two categories:

Direct Substitutes (8-TSSOP Package): Parts maintaining identical 8-TSSOP packaging with full electrical parameter compatibility.

Functional Equivalents (8-SOIC Package): Parts with equivalent electrical performance in 8-SOIC packaging, requiring PCB layout modification but maintaining electrical functionality.

Parameter Comparison

Part Number	Manufacturer	Package	Product Status	Supply Voltage	Input Offset (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Output Type
LM393PT	Rohm Semiconductor	8-TSSOP	Obsolete	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	1mA	0°C ~ 70°C	Open-Collector, Rail-to-Rail
LM2903PT	STMicroelectronics	8-TSSOP	Active	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Open-Collector, Rail-to-Rail
LM2903YPT	STMicroelectronics	8-TSSOP	Active	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Open-Collector, Rail-to-Rail
AS393AMTR-E1	Diodes Incorporated	8-SOIC	Active	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Open-Collector
AS393AMTR-G1	Diodes Incorporated	8-SOIC	Active	2V ~ 36V, ±1V ~ 18V	3mV @ 1.4V	16mA	1mA	-40°C ~ 85°C	Open-Collector
AS393MTR-G1	Diodes Incorporated	8-SOIC	Active	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Open-Collector
AZV393MTR-G1	Diodes Incorporated	8-SOIC	Active	2.5V ~ 5.5V	7mV @ 5V	84mA	200µA	-40°C ~ 85°C	Open-Collector
LMV393ID	Texas Instruments	8-SOIC	Last Time Buy	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	250µA	-40°C ~ 85°C	Open-Collector
LMV393IDGKR	Texas Instruments	8-VSSOP	Active	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	250µA	-40°C ~ 85°C	Open-Collector
LMV393MX	Texas Instruments	8-SOIC	Last Time Buy	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	CMOS, Open-Collector, TTL
LMV393MX/NOPB	Texas Instruments	8-SOIC	Active	2.7V ~ 5.5V	7mV @ 5V	84mA @ 5V	300µA	-40°C ~ 85°C	CMOS, Open-Collector, TTL

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (Recommended for Immediate Replacement):

LM2903PT and LM2903YPT from STMicroelectronics are the primary direct substitutes. Both maintain 8-TSSOP packaging and full electrical compatibility with the LM393PT. LM2903PT is suitable for commercial applications with extended temperature range (-40°C to 125°C). LM2903YPT includes AEC-Q100 automotive qualification, appropriate for automotive and high-reliability applications. Both are active products with established supply chains.

Functional Equivalents (Package Modification Required):

AS393 series comparators from Diodes Incorporated (AS393AMTR-E1, AS393AMTR-G1, AS393MTR-G1) provide functional equivalence in 8-SOIC packaging. These require PCB layout modification but offer active product status and extended temperature range (-40°C to 85°C). AS393AMTR-E1 and AS393MTR-G1 match the LM393PT quiescent current specification (1mA), making them suitable for low-power applications.

LMV393 series from Texas Instruments (LMV393IDGKR, LMV393MX/NOPB) are active products with extended temperature range. These devices operate at reduced supply voltage (2.7V to 5.5V) and higher output current (84mA), suitable for low-voltage applications requiring higher drive capability.

Not Recommended:

AZV393MTR-G1 operates at restricted supply voltage (2.5V to 5.5V) and exhibits higher quiescent current (200µA), making it unsuitable for designs requiring the full 2V to 36V supply range of the LM393PT.

LMV393ID is classified as Last Time Buy, indicating discontinued production.

Frequently Asked Questions (FAQ)

Q: Can LM2903PT directly replace LM393PT without PCB modification?

A: Yes. LM2903PT maintains identical 8-TSSOP packaging and pin configuration. Electrical parameters are compatible within the specified operating conditions. No PCB layout changes are required.

Q: What is the difference between LM2903PT and LM2903YPT?

A: Both share identical electrical specifications and 8-TSSOP packaging. LM2903YPT includes AEC-Q100 automotive qualification and is specified for automotive applications. LM2903PT is suitable for commercial and industrial applications. Temperature range is identical (-40°C to 125°C).

Q: Why do AS393 series parts require PCB modification?

A: AS393 series comparators use 8-SOIC packaging instead of 8-TSSOP. While pin count is identical, the physical footprint differs. PCB layout modification is necessary to accommodate the different package dimensions (8-SOIC: 0.154" width vs. 8-TSSOP: 0.173" width).

Q: Can LMV393 series replace LM393PT in all applications?

A: No. LMV393 series operates at reduced supply voltage (2.7V to 5.5V maximum) compared to LM393PT (2V to 36V). Applications requiring supply voltages above 5.5V cannot use LMV393 devices. Additionally, LMV393 exhibits higher quiescent current (250µA to 300µA vs. 1mA for LM393PT).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the LM393PT.

Q: What is the significance of MSL rating in these comparators?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 3 (168 Hours) requires controlled storage conditions. LM393PT and most substitutes carry MSL 1 rating, except AS393MTR-G1 and AZV393MTR-G1 which carry MSL 3.

Q: Which substitute offers the best supply voltage compatibility with LM393PT?

A: AS393 series (AS393AMTR-E1, AS393AMTR-G1, AS393MTR-G1) maintains the full 2V to 36V supply voltage range of the LM393PT. LMV393 series is limited to 2.7V to 5.5V and is not suitable for high-voltage applications.

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