LM393DR Equivalent & Substitute Parts

Part Overview

The LM393DR is a general-purpose dual comparator manufactured by Rohm Semiconductor 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 LM393DR is classified as "Not For New Designs," indicating end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing production support, design continuity, and component availability assurance.

Key Parameters

Parameter	LM393DR Value
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	6mA @ 5V
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°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 LM393DR is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

Dual comparator configuration (2 elements)
Open-Collector, Rail-to-Rail output type
Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input offset voltage: 7mV or lower @ 5V
Input bias current: 0.25µA or lower @ 5V
Quiescent current: 2.5mA or lower
8-SOIC package footprint compatibility
Surface mount technology

Upgrade Substitutes (LM2903 series from STMicroelectronics and Texas Instruments) meet all electrical parameters with enhanced specifications and active product status. These parts feature higher output current capability (16mA to 20mA) and extended operating temperature ranges (-40°C to 125°C or -40°C to 150°C), providing improved performance margins.

Similar Substitutes (LM193 series and AP393ASG-13) maintain functional equivalence with comparable electrical characteristics but may include package variations (8-SOP, 8-UFSON) or different manufacturers (UMW, Diodes Incorporated). These alternatives preserve core comparator functionality while offering design flexibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Output Current (Typ)	Operating Temp	Package	AEC-Q100
LM393DR	Rohm Semiconductor	Not For New Designs	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	6mA @ 5V	0°C ~ 70°C	8-SOIC	No
LM2903DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	-40°C ~ 125°C	8-SOIC	No
LM2903HYDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	16mA @ 5V	-40°C ~ 150°C	8-SOIC	Yes
LM2903YDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	-40°C ~ 125°C	8-SOIC	Yes
AP393ASG-13	Diodes Incorporated	Active	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V ~ 36V, ±1V ~ 18V	8mV @ 5V	16mA @ 5V	0°C ~ 70°C	8-SOP	No
LM193DR	UMW	Active	Open-Collector, Rail-to-Rail	2V ~ 32V, ±1V ~ 16V	5mV	16mA	-55°C ~ 125°C	8-SOP	No
LM193DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	18mA @ 5V	-55°C ~ 125°C	8-SOIC	No
LM193QT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	—	—	—	8-UFSON (2x2)	No
LM2903AVQDRG4Q1	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	20mA	-40°C ~ 125°C	8-SOIC	Yes
LM2903AVQPWR	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	20mA	-40°C ~ 125°C	8-TSSOP	No
LM2903AVQPWRG4Q1	Texas Instruments	Active	Open-Collector, Rail-to-Rail	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	20mA	-40°C ~ 125°C	8-TSSOP	Yes

Engineering Selection Recommendations

For Direct 8-SOIC Package Replacement: LM2903DT, LM2903HYDT, and LM2903YDT from STMicroelectronics provide pin-compatible substitution with identical 8-SOIC footprints. All three maintain the required electrical specifications while offering active product status. LM2903HYDT and LM2903YDT include AEC-Q100 automotive qualification, suitable for applications requiring extended temperature operation and automotive-grade reliability.

For Automotive Applications (AEC-Q100 Qualified): LM2903HYDT, LM2903YDT (STMicroelectronics), LM2903AVQDRG4Q1, and LM2903AVQPWRG4Q1 (Texas Instruments) carry AEC-Q100 qualification. These parts support operating temperatures from -40°C to 125°C or -40°C to 150°C, exceeding the LM393DR's 0°C to 70°C range.

For Alternative Package Formats: LM193DT (8-SOIC, STMicroelectronics) and LM193DR (8-SOP, UMW) offer functionally equivalent performance with improved input offset voltage specifications (5mV maximum). LM193QT provides a compact 8-UFSON (2x2) option for space-constrained designs. LM2903AVQPWR and LM2903AVQPWRG4Q1 utilize 8-TSSOP packaging for applications requiring smaller footprints.

For General-Purpose Applications Without Automotive Requirements: AP393ASG-13 (Diodes Incorporated, 8-SOP) maintains functional equivalence with comparable electrical performance and active product status, though operating temperature range matches the original LM393DR specification (0°C to 70°C).

Frequently Asked Questions (FAQ)

Q: Can LM2903DT directly replace LM393DR in existing PCB designs? A: Yes. LM2903DT shares identical 8-SOIC pinout and footprint with LM393DR. Electrical parameters (supply voltage, input offset, quiescent current) are compatible. The primary difference is higher output current capability (16mA vs. 6mA), which improves performance margins without affecting circuit functionality.

Q: What is the difference between LM2903HYDT and LM2903YDT? A: Both are STMicroelectronics LM2903 variants in 8-SOIC packaging with AEC-Q100 qualification. LM2903HYDT operates to 150°C maximum junction temperature, while LM2903YDT operates to 125°C. Input offset voltage specification differs: LM2903HYDT is measured at 30V, LM2903YDT at 5V. Selection depends on application temperature requirements.

Q: Are Texas Instruments LM2903AVQDRG4Q1 and LM2903AVQPWRG4Q1 interchangeable? A: Both are AEC-Q100 qualified with identical electrical specifications. The primary difference is package format: LM2903AVQDRG4Q1 uses 8-SOIC, while LM2903AVQPWRG4Q1 uses 8-TSSOP. PCB layout and footprint compatibility determine which part is suitable for a given design.

Q: Why does LM193QT show missing electrical parameters? A: LM193QT in 8-UFSON (2x2) package has incomplete parameter documentation in available datasheets. Core specifications (2 elements, open-collector output, 2V–36V supply, 2.5mA quiescent current) are confirmed. Detailed input offset and output current values are not provided. Verification with the manufacturer is recommended before design implementation.

Q: Can LM2903AVQPWR (non-automotive) be used instead of LM2903AVQPWRG4Q1 (AEC-Q100)? A: Both parts are electrically identical with 8-TSSOP packaging and identical operating specifications (-40°C to 125°C). The "G4Q1" suffix indicates AEC-Q100 automotive qualification. For non-automotive applications, LM2903AVQPWR is functionally equivalent. Automotive applications require the AEC-Q100 qualified variant.

Q: What is the impact of switching from 8-SOIC to 8-TSSOP packaging? A: 8-TSSOP (Thin Shrink Small Outline Package) has a smaller footprint (0.173" width) compared to 8-SOIC (0.154" width). While both are surface mount, PCB layout and routing differ. Verify PCB design compatibility before substitution. Electrical performance is identical between package variants of the same part number.

Q: Is LM193DR (UMW) suitable for designs currently using LM393DR? A: LM193DR meets core electrical requirements with superior input offset voltage (5mV vs. 7mV) and extended operating temperature (-55°C to 125°C). However, supply voltage range is slightly reduced (2V–32V vs. 2V–36V). Verify application voltage requirements before substitution. 8-SOP packaging differs from LM393DR's 8-SOIC footprint.

Q: Why is AP393ASG-13 listed as a similar rather than direct substitute? A: AP393ASG-13 (Diodes Incorporated) uses 8-SOP packaging instead of 8-SOIC, requiring PCB redesign. Output type specification includes additional logic families (CMOS, DTL, ECL, MOS, TTL) beyond open-collector, and input offset voltage is slightly higher (8mV vs. 7mV). These differences classify it as functionally similar but not pin-compatible.

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