LM393M Equivalent & Substitute Parts

Part Overview

The LM393M is a dual general-purpose comparator manufactured by Texas Instruments in 8-SOIC surface-mount packaging. It features open-collector, rail-to-rail output configuration with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The device is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM393M
Manufacturer	Texas Instruments
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2.5mA
Propagation Delay (Max)	700ns
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the LM393M is determined by the following critical parameters:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
Open-Collector output type with rail-to-rail capability
Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
Input offset voltage maximum: 5mV @ 30V or better
Input bias current maximum: 0.25µA @ 5V or better
Output current capability: 16mA @ 5V minimum
Quiescent current maximum: 2.5mA or better

Mechanical Compatibility Requirements:

8-SOIC package (0.154", 3.90mm Width)
Surface-mount configuration
Pin-compatible footprint

Compliance Requirements:

ROHS3 compliant
EAR99 classification

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (same base product number with different packaging designations), Upgrade Alternatives (enhanced temperature range or performance specifications), and Manufacturer-Recommended Alternatives (cross-manufacturer compatible devices).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Supply (Single/Dual)	Input Offset (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Inventory
LM393M	Texas Instruments	Last Time Buy	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	1980 Pcs
LM393M/NOPB	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	5381 Pcs
LM193DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	18mA @ 5V	2.5mA	-55°C ~ 125°C	8-SOIC	78081 Pcs
LM2903WDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	67700 Pcs
LM2903WYDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	27390 Pcs
LM293DT	STMicroelectronics	Active	Open-Collector, Open-Drain, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	18mA @ 5V	2.5mA	-40°C ~ 105°C	8-SOIC	125100 Pcs
AS393AMTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	232200 Pcs
AS393AMTR-G1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	3mV @ 1.4V	16mA	1mA	-40°C ~ 85°C	8-SOIC	25475 Pcs
AS393MTR-E1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	354160 Pcs
AS393MTR-G1	Diodes Incorporated	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	300400 Pcs
BA10393F-E2	Rohm Semiconductor	Active	Open-Collector	2V ~ 36V, ±1V ~ 18V	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	105300 Pcs

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice): LM393M/NOPB from Texas Instruments maintains identical electrical specifications and operating temperature range as the original LM393M. This part is in Active product status with higher inventory availability (5381 units), making it the preferred direct replacement for existing designs without modification.

Extended Temperature Range Alternatives: LM193DT (STMicroelectronics) and LM293DT (STMicroelectronics) extend the operating temperature range to -55°C ~ 125°C and -40°C ~ 105°C respectively, suitable for industrial and automotive applications requiring wider temperature performance. LM2903WDT and LM2903WYDT provide -40°C ~ 125°C operation with enhanced output current capability (20mA typical).

Cross-Manufacturer Alternatives: AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 from Diodes Incorporated, and BA10393F-E2 from Rohm Semiconductor are functionally compatible with identical supply voltage ranges and package configurations. These devices feature lower quiescent current (1mA maximum) and improved input offset specifications in certain variants. All are in Active product status with substantial inventory availability.

Compliance Considerations: All listed substitute parts maintain ROHS3 compliance and EAR99 classification consistent with the original LM393M. LM2903WYDT carries AEC-Q100 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can LM393M/NOPB be used as a direct drop-in replacement for LM393M? A: Yes. LM393M/NOPB is electrically and mechanically identical to LM393M, differing only in packaging designation (NOPB indicates no plumbum/lead-free). It is pin-compatible and requires no circuit modifications.

Q: What is the difference between LM193DT and LM293DT? A: Both are STMicroelectronics comparators with identical electrical specifications. LM193DT operates from 0°C ~ 70°C (matching the original LM393M temperature range), while LM293DT extends to -40°C ~ 105°C. LM293DT also includes open-drain output capability in addition to open-collector.

Q: Are the Diodes Incorporated AS393 variants fully compatible with LM393M? A: AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 are functionally compatible with identical supply voltage ranges, package configuration, and dual-comparator architecture. All maintain open-collector output and 8-SOIC packaging. Quiescent current is lower (1mA vs. 2.5mA), and input offset specifications vary by variant.

Q: Does package size differ between BA10393F-E2 and LM393M? A: Both use 8-SOIC packaging. BA10393F-E2 specifies 8-SOP with 0.173" (4.40mm) width versus LM393M's 0.154" (3.90mm) width. Verify PCB footprint compatibility before substitution.

Q: Which substitute part has the best inventory availability? A: AS393MTR-E1 from Diodes Incorporated has the highest inventory (354160 units), followed by AS393MTR-G1 (300400 units) and AS393AMTR-E1 (232200 units).

Q: Can LM2903WYDT be used in automotive applications? A: Yes. LM2903WYDT carries AEC-Q100 automotive qualification and is suitable for automotive-grade designs requiring -40°C ~ 125°C operation and enhanced output current (20mA).

Q: What is the key difference between LM2903WDT and LM2903WYDT? A: Both are STMicroelectronics LM2903 comparators with identical electrical specifications and operating temperature range (-40°C ~ 125°C). LM2903WYDT includes AEC-Q100 automotive qualification; LM2903WDT does not.

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