LM293AD Equivalent & Substitute Parts

Part Overview

The LM293AD is a general-purpose dual comparator IC manufactured by Texas Instruments in 8-SOIC surface mount packaging. It features open-collector, open-drain, and rail-to-rail output configurations suitable for analog signal comparison applications across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM293AD is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Direct replacements and functional upgrades are available from multiple manufacturers with identical or enhanced electrical characteristics.

Key Parameters

Parameter	Value
Number of Elements	2
Output Type	Open-Collector, Open-Drain, Rail-to-Rail
Voltage Supply Range (Single/Dual)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	2mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2.5mA
Operating Temperature	-25°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM293AD is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Dual comparator configuration (2 elements)
Supply voltage range: 2V ~ 36V single supply or ±1V ~ ±18V dual supply
Output type: Open-collector or open-drain capability
Input offset voltage: Maximum 2mV to 8mV @ specified test conditions
Input bias current: Maximum 0.25µA to 0.4µA @ 5V
Output current capability: Minimum 16mA typical
Quiescent current: Maximum 2.5mA

Mechanical Compatibility Criteria:

Package type: 8-SOIC or 8-SOP surface mount
Pin count: 8 pins
Package width: 0.154" to 0.173" (3.90mm to 4.40mm)

Compliance Requirements:

RoHS3 compliance mandatory
Moisture sensitivity level acceptable up to MSL 3 (168 Hours)

Substitute parts are grouped into three categories: direct replacements (identical specifications and packaging), upgrades (enhanced temperature range or automotive qualification), and functional equivalents (compatible electrical performance with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Packaging Type
LM293AD	Texas Instruments	Obsolete	Open-Collector, Open-Drain, Rail-to-Rail	2mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C ~ 85°C	8-SOIC	Tube
LM293ADR	Texas Instruments	Active	Open-Collector, Open-Drain, Rail-to-Rail	2mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®
LM2903WDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	Tape & Reel (TR)
LM2903WYDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	7mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	8-SOIC	Cut Tape (CT) & Digi-Reel®
AP393ASG-13	Diodes Incorporated	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	8mV @ 5V	0.4µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)
AS393AMTR-E1	Diodes Incorporated	Active	Open-Collector	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)
AS393AMTR-G1	Diodes Incorporated	Active	Open-Collector	3mV @ 1.4V	0.4µA @ 5V	16mA	1mA	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)
AS393MTR-E1	Diodes Incorporated	Active	Open-Collector	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	Tape & Reel (TR)
AS393MTR-G1	Diodes Incorporated	Active	Open-Collector	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®
BA10393F-E2	Rohm Semiconductor	Active	Open-Collector	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOP	Cut Tape (CT) & Digi-Reel®
BA2903SF-E2	Rohm Semiconductor	Active	Open-Collector	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C ~ 105°C	8-SOP	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): LM293ADR is the direct active replacement for the obsolete LM293AD. Both parts are manufactured by Texas Instruments with identical electrical specifications, supply voltage range, input offset voltage, and operating temperature. The only difference is packaging format: LM293ADR is supplied in Cut Tape (CT) & Digi-Reel® format instead of Tube. This part maintains full compatibility with existing designs without any circuit modifications.

Upgraded Replacements (Enhanced Temperature Range): LM2903WDT and LM2903WYDT from STMicroelectronics provide extended operating temperature range (-40°C ~ 125°C) compared to the LM293AD (-25°C ~ 85°C). Both maintain identical supply voltage range, output current capability, and quiescent current specifications. Input offset voltage increases to 7mV maximum at 30V. LM2903WYDT includes automotive qualification (AEC-Q100) for applications requiring automotive-grade components. These parts are suitable for designs requiring wider temperature operation or automotive compliance.

Functional Equivalents (Compatible Performance): AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 from Diodes Incorporated provide compatible dual comparator functionality with open-collector output. These parts maintain the 2V ~ 36V / ±1V ~ 18V supply voltage range and 8-SOIC packaging. Input offset voltage ranges from 3mV to 5mV, and quiescent current is reduced to 1mA maximum. Operating temperature extends to -40°C ~ 85°C. Output current is 16mA typical, slightly lower than the LM293AD's 20mA.

BA10393F-E2 and BA2903SF-E2 from Rohm Semiconductor offer equivalent performance in 8-SOP packaging (0.173" width versus 0.154" for standard 8-SOIC). BA2903SF-E2 extends operating temperature to -40°C ~ 105°C. Both maintain open-collector output and compatible supply voltage specifications.

Selection Criteria by Application:

For direct pin-compatible replacement with identical performance: LM293ADR
For extended temperature range without automotive requirements: LM2903WDT or LM2903WYDT
For automotive applications: LM2903WYDT (AEC-Q100 qualified)
For alternative manufacturers with reduced quiescent current: AS393 series or BA series parts
For applications requiring higher operating temperature: BA2903SF-E2 (-40°C ~ 105°C)

All substitute parts maintain RoHS3 compliance and acceptable moisture sensitivity levels for standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can LM293ADR be used as a direct replacement for LM293AD? A: Yes. LM293ADR is the active equivalent manufactured by Texas Instruments with identical electrical specifications, supply voltage range (-25°C ~ 85°C operating temperature), input offset voltage (2mV @ 30V), and output current (20mA typical). The only difference is packaging format: LM293ADR is supplied in Cut Tape (CT) & Digi-Reel® instead of Tube. No circuit modifications are required.

Q: What is the difference between LM2903WDT and LM2903WYDT? A: Both parts are manufactured by STMicroelectronics with identical electrical specifications and extended operating temperature range (-40°C ~ 125°C). The primary difference is that LM2903WYDT includes automotive qualification (AEC-Q100 grade) and is supplied in Cut Tape (CT) & Digi-Reel® packaging, while LM2903WDT is supplied in Tape & Reel (TR) format. Select LM2903WYDT for automotive applications requiring AEC-Q100 compliance.

Q: Are AS393 series parts compatible with LM293AD in terms of package and pin configuration? A: Yes. AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1, and AS393MTR-G1 are all supplied in 8-SOIC surface mount packaging with identical pin count and footprint compatibility. All maintain the 2V ~ 36V / ±1V ~ 18V supply voltage range and open-collector output configuration. Input offset voltage is slightly higher (3mV to 5mV versus 2mV), and quiescent current is lower (1mA versus 2.5mA). These differences are within acceptable tolerances for most general-purpose comparator applications.

Q: Can BA10393F-E2 or BA2903SF-E2 be used as direct replacements? A: These parts are functionally compatible but use 8-SOP packaging (0.173" width) instead of standard 8-SOIC (0.154" width). While pin count and electrical specifications are compatible, PCB footprint differences require layout verification. BA2903SF-E2 offers extended operating temperature (-40°C ~ 105°C) compared to LM293AD (-25°C ~ 85°C). Use these parts only if PCB layout accommodates the wider SOP package or if extended temperature range is required.

Q: What is the impact of input offset voltage differences between substitute parts? A: The LM293AD specifies 2mV maximum input offset voltage at 30V. Substitute parts range from 2mV (LM293ADR) to 8mV (AP393ASG-13) depending on manufacturer and test conditions. Higher input offset voltage reduces comparator precision in low-signal-level applications. For precision applications requiring offset voltage below 5mV, select LM293ADR, AS393AMTR-E1, or AS393AMTR-G1. For general-purpose applications, offset voltage differences up to 8mV are typically acceptable.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance. Moisture sensitivity levels range from MSL 1 (Unlimited) to MSL 3 (168 Hours). Standard PCB assembly processes accommodate MSL 3 components. Verify moisture sensitivity requirements for your specific manufacturing environment if extended storage or high-humidity conditions are present.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging? A: Both are surface mount tape formats suitable for automated assembly. Cut Tape (CT) & Digi-Reel® is supplied in shorter tape lengths (typically 500-piece reels) and is cost-effective for smaller production volumes. Tape & Reel (TR) is supplied in larger quantities (typically 2500-piece reels) and is more economical for high-volume production. Electrical specifications and component quality are identical between packaging formats.

Q: Can AP393ASG-13 be used in applications requiring the full -25°C ~ 85°C temperature range? A: No. AP393ASG-13 operates only from 0°C ~ 70°C, which is narrower than the LM293AD specification (-25°C ~ 85°C). This part is not suitable for applications requiring operation below 0°C or above 70°C. For extended temperature range, select LM2903WDT, LM2903WYDT, or BA2903SF-E2.

Q: What is the significance of quiescent current differences? A: The LM293AD specifies 2.5mA maximum quiescent current. AS393 and BA series parts reduce this to 1mA maximum, resulting in lower power consumption. This is beneficial for battery-powered or low-power applications. For applications where power consumption is not critical, the difference is negligible. For power-sensitive designs, AS393 or BA series parts provide improved efficiency.

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