LM393NG Equivalent & Substitute Parts

Part Overview

The LM393NG is a dual general-purpose comparator IC manufactured by onsemi in 8-DIP through-hole 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 LM393NG is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering active product status and improved availability.

Key Parameters

Parameter	Value
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
Operating Temperature	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the LM393NG is determined by the following critical parameters:

Number of Elements: Must be 2 (dual comparator)
Output Type: Must include Open-Collector configuration
Supply Voltage Range: Must support 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input Offset Voltage: Maximum 5mV to 7mV @ specified voltage
Input Bias Current: Maximum 0.25µA @ 5V
Output Current: Minimum 16mA @ 5V
Quiescent Current: Maximum 2.5mA
Package Compatibility: Through-hole 8-DIP or surface-mount equivalents (8-SOIC, 8-TSSOP, 8-SOP, TO-99-8)

Substitute parts are grouped by package type: DIP through-hole packages maintain direct pin compatibility, while surface-mount variants (SOIC, TSSOP, SOP) and alternative through-hole packages (TO-99-8) provide functional equivalence with different mounting requirements.

Parameter Comparison

Part Number	Manufacturer	Package	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
LM393NG	onsemi	8-DIP	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	Obsolete
LM293P	Texas Instruments	8-DIP	Open-Collector, Open-Drain, Rail-to-Rail	2V~36V, ±1V~18V	5mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C ~ 85°C	Active
AS393P-E1	Diodes Incorporated	8-DIP	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Active
LM193AH/NOPB	Texas Instruments	TO-99-8	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C ~ 125°C	Active
LM193DR	UMW	8-SOIC	Open-Collector, Rail-to-Rail	2V~32V, ±1V~16V	5mV	250nA	16mA	1mA	-55°C ~ 125°C	Active
LM2903D	STMicroelectronics	8-SOIC	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active
LM2903ITLX/NOPB	Texas Instruments	8-DSBGA	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM2903M	Texas Instruments	8-SOIC	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Last Time Buy
LM2903M/NOPB	Texas Instruments	8-SOIC	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 85°C	Active
LM2903P	Texas Instruments	8-DIP	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903PT	STMicroelectronics	8-TSSOP	Open-Collector, Rail-to-Rail	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (8-DIP Through-Hole)

LM293P and LM2903P provide direct 8-DIP pin compatibility with the LM393NG. Both are active products with enhanced temperature ranges (-25°C to 85°C and -40°C to 125°C respectively) compared to the original 0°C to 70°C specification. LM293P offers slightly higher output current (20mA typical) and is ROHS3 compliant. LM2903P extends the operating temperature to -40°C to 125°C and is ROHS3 compliant.

AS393P-E1 (Diodes Incorporated) maintains 8-DIP compatibility with lower quiescent current (1mA) and extended temperature range (-40°C to 85°C). This part is ROHS3 compliant and offers high inventory availability.

Surface-Mount Alternatives (8-SOIC, 8-TSSOP)

LM2903M/NOPB and LM2903D provide 8-SOIC packaging with full electrical compatibility. LM2903M/NOPB is active with 120,721 units in stock. LM2903PT offers 8-TSSOP packaging with the widest operating temperature range (-40°C to 125°C) and highest inventory (325,100 units).

Alternative Through-Hole Package (TO-99-8)

LM193AH/NOPB provides TO-99-8 metal can packaging with superior specifications: lower input offset voltage (2mV @ 30V), lower input bias current (0.1µA @ 5V), and extended temperature range (-55°C to 125°C). This part is ROHS3 compliant and suitable for applications requiring enhanced performance.

Compact Surface-Mount Option (8-DSBGA)

LM2903ITLX/NOPB offers 8-DSBGA ball grid array packaging for space-constrained applications. This part maintains full electrical compatibility with 700ns propagation delay specification and is ROHS3 compliant.

All substitute parts are REACH unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can LM293P directly replace LM393NG in existing designs?

A: Yes. LM293P maintains identical 8-DIP pinout and electrical specifications (2V~36V supply, 5mV input offset, 0.25µA input bias, 16mA output current). The primary differences are enhanced temperature range (-25°C to 85°C versus 0°C to 70°C) and active product status. Output current is slightly higher at 20mA typical.

Q: What is the difference between LM2903P and LM293P?

A: Both are 8-DIP through-hole packages with identical supply voltage and input specifications. LM2903P extends the operating temperature range to -40°C to 125°C and offers 20mA typical output current. LM293P operates from -25°C to 85°C. Both are ROHS3 compliant and active products.

Q: Can I use surface-mount alternatives if my PCB is designed for through-hole?

A: No. Surface-mount packages (8-SOIC, 8-TSSOP, 8-DSBGA) require different PCB layouts and cannot be directly soldered into through-hole footprints. However, they provide functional equivalence for new designs or PCB redesigns. LM2903PT (8-TSSOP) and LM2903M/NOPB (8-SOIC) are recommended for surface-mount applications.

Q: Does LM193AH/NOPB in TO-99-8 package work as a substitute?

A: Yes, functionally. LM193AH/NOPB provides superior electrical performance (2mV input offset, 0.1µA input bias) and extended temperature range (-55°C to 125°C). However, TO-99-8 metal can packaging requires different PCB footprint and mounting hardware compared to 8-DIP. This part is suitable for applications requiring enhanced specifications and is ROHS3 compliant.

Q: Which substitute offers the best inventory availability?

A: LM2903PT (STMicroelectronics, 8-TSSOP) has the highest inventory at 325,100 units. LM2903M/NOPB (Texas Instruments, 8-SOIC) has 120,721 units. For through-hole 8-DIP, LM2903P (Texas Instruments) has 22,509 units and LM293P (Texas Instruments) has 2,560 units.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are RoHS3 compliant. The original LM393NG does not specify RoHS status. All substitutes are REACH unaffected.

Q: What is the maximum supply voltage difference between LM393NG and substitutes?

A: LM393NG supports 2V~36V (single) or ±1V~18V (dual). LM193DR (UMW) has a slightly lower maximum of 2V~32V (single) or ±1V~16V (dual). All other substitutes maintain the full 2V~36V / ±1V~18V range.

Q: Can I use LM2903ITLX/NOPB (8-DSBGA) in a standard PCB?

A: No. 8-DSBGA is a ball grid array package requiring specialized PCB design with solder balls and controlled collapse chip connection (C4) technology. This package is suitable only for high-density applications with appropriate manufacturing capabilities.

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