LM393D Equivalent & Substitute Parts

Part Overview

The LM393D is a dual general-purpose voltage comparator manufactured by Texas Instruments in 8-SOIC 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 LM393D is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. Substitute parts maintain functional equivalence while offering improved availability and active product status from alternative manufacturers.

Key Parameters

Parameter	Value
Part Number	LM393D
Manufacturer	Texas Instruments
Category	Linear Comparator
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
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)	20mA
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mandatory for pin-compatible replacement
Mounting Type: Surface Mount — required for PCB assembly compatibility
Number of Elements: 2 — functional requirement for dual comparator operation
Output Type: Open-Collector or Open-Collector with Rail-to-Rail capability
Voltage - Supply, Single/Dual (±): 2V ~ 36V, ±1V ~ 18V — must support full supply range
Voltage - Input Offset (Max): ≤ 7mV — acceptable tolerance variance
Current - Input Bias (Max): ≤ 0.25µA — input stage compatibility
Current - Quiescent (Max): ≤ 2.5mA — power consumption compatibility

Secondary Considerations:

RoHS3 Compliance and REACH Unaffected status required for regulatory alignment
MSL rating of 1 or 3 acceptable for standard manufacturing environments
Product Status: Active or Not For New Designs acceptable; Obsolete status disqualifies further substitution

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (same base part number from alternative manufacturers), Manufacturer-Recommended Alternatives (active production parts with enhanced specifications), and Upgrade Options (functionally superior parts with extended temperature or improved performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Input Offset (Max)	Current - Output (Typ)	Current - Quiescent (Max)	Operating Temperature	Packaging
LM393D	Texas Instruments	Obsolete	Open-Collector, Rail-to-Rail	5mV @ 30V	20mA	2.5mA	0°C ~ 70°C	Tube
LM393DR	Rohm Semiconductor	Not For New Designs	Open-Collector, Rail-to-Rail	7mV @ 5V	6mA @ 5V	2.5mA	0°C ~ 70°C	Cut Tape (CT) & Digi-Reel®
LM293D	STMicroelectronics	Active	Open-Collector, Open-Drain, Rail-to-Rail	5mV @ 30V	18mA @ 5V	2.5mA	-40°C ~ 105°C	Tube
LM393M/NOPB	Texas Instruments	Active	Open-Collector, Rail-to-Rail	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	Tube
LM393MX/NOPB	Texas Instruments	Active	Open-Collector, Rail-to-Rail	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	Cut Tape (CT) & Digi-Reel®
LM393D	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	5mV @ 30V	18mA @ 5V	2.5mA	0°C ~ 70°C	Tube
LM393DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	5mV @ 30V	18mA @ 5V	2.5mA	0°C ~ 70°C	Cut Tape (CT) & Digi-Reel®
LM393WDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	Tape & Reel (TR)
AS393MTR-E1	Diodes Incorporated	Active	Open-Collector	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Tape & Reel (TR)
AS393MTR-G1	Diodes Incorporated	Active	Open-Collector	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®
LM193DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	5mV @ 30V	18mA @ 5V	2.5mA	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility): LM393D (STMicroelectronics) and LM393DT (STMicroelectronics) are direct part-number equivalents with active product status. Both maintain identical electrical specifications to the original Texas Instruments LM393D and are ROHS3 compliant with MSL 1 rating. LM393DT offers superior availability in cut-tape packaging for high-volume production.

Manufacturer-Recommended Alternatives: LM393M/NOPB and LM393MX/NOPB (Texas Instruments) are active production variants of the LM393 base product. Both maintain identical electrical performance and operating temperature range. LM393MX/NOPB provides higher inventory availability in cut-tape format. These parts are recommended for designs requiring original manufacturer continuity.

Extended Temperature Range Option: LM193DT (STMicroelectronics) extends operating temperature to -55°C ~ 125°C while maintaining all electrical parameters of the original LM393D. This part is suitable for applications requiring military or automotive temperature specifications. ROHS3 compliance and MSL 1 rating ensure manufacturing compatibility.

Alternative Manufacturer Options: AS393MTR-E1 and AS393MTR-G1 (Diodes Incorporated) provide functionally equivalent performance with reduced quiescent current (1mA vs. 2.5mA) and extended operating temperature (-40°C ~ 85°C). These parts carry MSL 3 rating and are suitable for standard commercial applications. AS393MTR-G1 offers superior availability in cut-tape packaging.

Not Recommended for New Designs: LM393DR (Rohm Semiconductor) carries "Not For New Designs" status and exhibits higher input offset voltage (7mV @ 5V) and reduced output current (6mA @ 5V). This part should be avoided for new production designs.

Frequently Asked Questions (FAQ)

Q: Can LM393D (STMicroelectronics) be used as a direct replacement for LM393D (Texas Instruments)? A: Yes. Both parts share identical part numbers, package specifications (8-SOIC), and electrical parameters. STMicroelectronics LM393D is an active product with superior availability and is fully compatible for pin-for-pin replacement.

Q: What is the difference between LM393DT and LM393D packaging? A: LM393D is supplied in Tube packaging, while LM393DT is supplied in Cut Tape (CT) & Digi-Reel® format. Both are electrically identical; packaging selection depends on production volume and assembly line requirements. Cut-tape format is preferred for automated high-volume manufacturing.

Q: Can AS393MTR-G1 replace LM393D in all applications? A: AS393MTR-G1 is functionally compatible for most applications. Key differences include reduced quiescent current (1mA vs. 2.5mA), extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C), and MSL 3 moisture sensitivity. Verify application temperature requirements before substitution.

Q: Why is LM193DT listed as an upgrade option? A: LM193DT extends the operating temperature range to -55°C ~ 125°C while maintaining all electrical specifications of the original LM393D. This makes it suitable for applications requiring military-grade or automotive temperature specifications. It is recommended for designs targeting extended environmental conditions.

Q: Is LM293D a suitable substitute? A: LM293D is functionally equivalent with active product status and extended operating temperature (-40°C ~ 105°C). The primary difference is the addition of Open-Drain output capability alongside Open-Collector. This part is suitable for applications requiring enhanced temperature performance.

Q: What does "Not For New Designs" status mean for LM393DR? A: This designation indicates the manufacturer is discontinuing the product line and recommends against its use in new designs. While LM393DR may remain available in inventory, it should not be selected for new production due to long-term supply uncertainty and potential future unavailability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements for commercial electronics manufacturing.

Q: What packaging options are available for high-volume production? A: For high-volume automated assembly, Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) formats are recommended. Available options include LM393MX/NOPB, LM393DT, LM393WDT, AS393MTR-G1, and LM193DT. Tube packaging (LM393M/NOPB, LM393D STMicroelectronics, LM293D) is suitable for lower-volume or manual assembly operations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message