LM393N Equivalent & Substitute Parts

Part Overview

The LM393N is a dual general-purpose comparator IC manufactured by Texas Instruments in 8-DIP 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 LM393N is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

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
Propagation Delay (Max)	700ns
Operating Temperature	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the LM393N is determined by the following criteria:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
8-DIP package format (0.300", 7.62mm)
Through-hole mounting type
Supply voltage range encompassing 2V ~ 36V single or ±1V ~ ±18V dual operation
Input offset voltage within specified limits
Input bias current within specified limits
Output current capability of 16mA or greater

Acceptable Output Type Variations:

Open-Collector, Rail-to-Rail (direct match)
Open-Collector (subset of original specification)
Pull-Up output (functionally compatible with external pull-up resistor configuration)

Compliance and Status Considerations:

Active product status preferred for new designs
RoHS3 compliance required for regulated applications
REACH compliance maintained across all alternatives

Parameter Comparison

Parameter	LM393N	LM393N/NOPB	AS393P-E1	LT1017CN8#PBF	LT1017IN8#PBF	LT1018CN8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Diodes Incorporated	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Number of Elements	2	2	2	2	2	2
Output Type	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector	Pull Up	Pull Up	Pull Up
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	1.1V ~ 40V, ±0.55V ~ 20V	1.1V ~ 40V, ±0.55V ~ 20V	1.1V ~ 40V, ±0.55V ~ 20V
Voltage - Input Offset (Max)	5mV @ 30V	5mV @ 30V	5mV @ 5V	1mV @ ±20V	1mV @ ±20V	1mV @ ±20V
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.015µA @ ±20V	0.015µA @ ±20V	0.075µA @ ±20V
Current - Output (Typ)	16mA @ 5V	16mA @ 5V	16mA @ 5V	75mA @ 40V	65mA @ 4.5V	70mA @ 4.5V
Current - Quiescent (Max)	2.5mA	2.5mA	1mA	60µA	60µA	250µA
Propagation Delay (Max)	700ns	700ns	Not specified	22µs	22µs	6µs
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): LM393N/NOPB is the direct successor to the obsolete LM393N, manufactured by Texas Instruments. This part maintains identical electrical specifications and packaging while offering active product status and RoHS3 compliance. Selection of LM393N/NOPB is appropriate for designs requiring no circuit modifications and maximum compatibility with existing documentation.

Texas Instruments Alternative: AS393P-E1 from Diodes Incorporated provides equivalent electrical performance with identical supply voltage range and output current specifications. This part features reduced quiescent current (1mA vs. 2.5mA) and extended operating temperature range (-40°C to 85°C). RoHS3 compliance is maintained. This option is suitable for applications where lower power consumption is beneficial.

Enhanced Performance Alternatives (Analog Devices LT Series): The LT1017CN8#PBF, LT1017IN8#PBF, and LT1018CN8#PBF represent enhanced comparator designs with superior electrical characteristics. These parts feature pull-up output configuration (requiring external pull-up resistor), lower input offset voltage (1mV vs. 5mV), significantly lower input bias current (0.015µA to 0.075µA vs. 0.25µA), and higher output current capability (65mA to 75mA vs. 16mA). Extended supply voltage range (1.1V to 40V) and RoHS3 compliance are provided.

Output Type Consideration: LT series parts employ pull-up output configuration rather than open-collector, rail-to-rail. This requires external pull-up resistor implementation but provides superior performance characteristics. Circuit redesign is necessary for LT series integration.

Temperature Range Selection: For applications requiring extended operating temperature range (-40°C to 85°C), select AS393P-E1 or LT1017IN8#PBF. Standard temperature range (0°C to 70°C) applications may use LM393N/NOPB, LT1017CN8#PBF, or LT1018CN8#PBF.

Frequently Asked Questions (FAQ)

Q: Can LM393N/NOPB be used as a direct replacement for LM393N? A: Yes. LM393N/NOPB is the active production equivalent with identical electrical specifications, package format, and pin configuration. No circuit modifications are required.

Q: What is the primary difference between LM393N and AS393P-E1? A: Both parts are electrically equivalent with identical supply voltage range and output current specifications. AS393P-E1 offers reduced quiescent current (1mA vs. 2.5mA) and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C). Both are RoHS3 compliant.

Q: Why do LT1017 and LT1018 series parts have different output types? A: LT series comparators employ pull-up output configuration rather than open-collector. This design provides superior performance characteristics including lower input offset voltage, lower input bias current, and higher output current capability. External pull-up resistor implementation is required.

Q: Can LT1017CN8#PBF replace LM393N in existing circuits without modification? A: No. LT1017CN8#PBF uses pull-up output configuration, requiring external pull-up resistor. Circuit redesign is necessary. However, electrical performance is enhanced across all measured parameters.

Q: What is the difference between LT1017CN8#PBF and LT1017IN8#PBF? A: Both parts are electrically identical with identical specifications. The primary difference is operating temperature range: LT1017CN8#PBF operates 0°C to 70°C, while LT1017IN8#PBF operates -40°C to 85°C. Select based on application temperature requirements.

Q: How does LT1018CN8#PBF differ from LT1017CN8#PBF? A: Both are Analog Devices pull-up comparators with identical supply voltage range and output current capability. LT1018CN8#PBF features faster propagation delay (6µs vs. 22µs) but higher quiescent current (250µA vs. 60µA). Select LT1018CN8#PBF for speed-critical applications; select LT1017CN8#PBF for lower power consumption.

Q: Are all substitute parts RoHS3 compliant? A: LM393N/NOPB, AS393P-E1, LT1017CN8#PBF, LT1017IN8#PBF, and LT1018CN8#PBF are all RoHS3 compliant. The original LM393N is RoHS non-compliant.

Q: What packaging format is used for all listed parts? A: All parts use 8-DIP (0.300", 7.62mm) through-hole packaging with identical pin configuration and footprint compatibility.

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