LM393DGKR Equivalent & Substitute Parts

Part Overview

The LM393DGKR is a general-purpose dual comparator IC manufactured by Rohm Semiconductor in 8-MSOP/VSSOP surface-mount packaging. This device features open-collector output configuration with supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual), making it suitable for analog signal comparison applications across industrial and consumer electronics.

The LM393DGKR carries a "Not For New Designs" product status, indicating it is legacy technology. Identifying equivalent and substitute parts is essential for ongoing production support, design refresh initiatives, and supply chain continuity when original inventory becomes unavailable.

Key Parameters

Parameter	LM393DGKR
Manufacturer	Rohm Semiconductor
Number of Elements	2
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Quiescent (Max)	1mA
Operating Temperature	0°C ~ 70°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM393DGKR is determined by the following critical parameters:

Electrical Compatibility Requirements:

Dual comparator configuration (2 elements)
Open-collector output type
Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input offset voltage: 7mV @ 5V or lower
Input bias current: 0.25µA @ 5V or lower
Quiescent current: 1mA or lower

Mechanical Compatibility Requirements:

8-pin surface-mount package (MSOP, TSSOP, SOIC, or SOP variants)
0.118" to 0.209" width tolerance for pin pitch compatibility

Environmental & Compliance Requirements:

Operating temperature range: 0°C ~ 70°C minimum
RoHS3 compliance
MSL rating: 1 (Unlimited) preferred for manufacturing flexibility

Substitute parts meeting all electrical parameters within the specified tolerances and housed in compatible 8-pin surface-mount packages are considered direct functional equivalents. Parts with extended temperature ranges or automotive qualifications provide enhanced reliability for demanding applications while maintaining full backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Type	Voltage - Supply (V)	Input Offset (mV)	Input Bias (µA)	Quiescent Current (mA)	Temp Range (°C)	Package	Product Status
LM393DGKR	Rohm Semiconductor	Open-Collector	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	1	0 ~ 70	8-MSOP	Not For New Designs
LM2903YST	STMicroelectronics	Open-Collector, Rail-to-Rail	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	2.5	-40 ~ 125	8-MiniSO	Active
AP393AM8G-13	Diodes Incorporated	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2-36 / ±1-18	8 @ 5V	0.4 @ 5V	2.5	0 ~ 70	8-MSOP	Active
AP393ASG-13	Diodes Incorporated	Open-Collector, CMOS, DTL, ECL, MOS, TTL	2-36 / ±1-18	8 @ 5V	0.4 @ 5V	2.5	0 ~ 70	8-SOP	Active
LM2903AVQPWRG4Q1	Texas Instruments	Open-Collector, Rail-to-Rail	2-36 / ±1-18	2 @ 5V	0.25 @ 5V	2.5	-40 ~ 125	8-TSSOP	Active
LM2903D	STMicroelectronics	Open-Collector, Rail-to-Rail	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	2.5	-40 ~ 125	8-SOIC	Active
LM2903DGKR	Rohm Semiconductor	Open-Collector, Rail-to-Rail	2-36 / ±1-18	7 @ 5V	0.25 @ 5V	2.5	-40 ~ 125	8-MSOP	Active
LM2903DR	UMW	Open-Collector, Rail-to-Rail	2-30 / ±1-±15	5 @ 5V	0.25 @ 5V	2.5	0 ~ 70	8-SOP	Active
LM2903HYDT	STMicroelectronics	Open-Collector, Rail-to-Rail	2-36 / ±1-18	7 @ 30V	0.25 @ 5V	2.5	-40 ~ 150	8-SOIC	Active
LM2903PSR	Texas Instruments	Open-Collector, Rail-to-Rail	2-36 / ±1-18	7 @ 30V	0.25 @ 5V	2.5	-40 ~ 125	8-SOIC	Active
LM2903PWR	Texas Instruments	Open-Collector, Rail-to-Rail	2-36 / ±1-18	7 @ 30V	0.25 @ 5V	2.5	-40 ~ 125	8-TSSOP	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Highest Compatibility):

LM2903DGKR (Rohm Semiconductor) is the primary substitute. It maintains identical electrical specifications to the LM393DGKR while offering active product status and extended operating temperature range (-40°C to 125°C). The same 8-MSOP package ensures pin-for-pin compatibility without PCB redesign. This part is recommended for direct replacement in existing designs.

Package-Variant Equivalents (Electrical Match, Different Footprint):

LM2903D (STMicroelectronics) and LM2903PSR (Texas Instruments) provide identical electrical performance in 8-SOIC packaging. These parts require PCB layout modification due to different pin pitch (0.154" vs. 0.118") but deliver superior long-term availability and active manufacturing status. Selection depends on PCB redesign feasibility.

Automotive-Grade Alternatives (Enhanced Reliability):

LM2903AVQPWRG4Q1 (Texas Instruments) and LM2903HYDT (STMicroelectronics) carry AEC-Q100 automotive qualification and extended temperature ratings (-40°C to 125°C or -40°C to 150°C). These parts are suitable for applications requiring enhanced reliability margins or operating in extended temperature environments. LM2903AVQPWRG4Q1 offers superior input offset voltage specification (2mV vs. 7mV).

Cost-Optimized Alternatives (Relaxed Specifications):

AP393AM8G-13 and AP393ASG-13 (Diodes Incorporated) meet all core electrical requirements with marginally higher input offset voltage (8mV) and input bias current (0.4µA). These parts are suitable for applications with relaxed precision requirements and offer cost advantages. Package variants (8-MSOP and 8-SOP) provide flexibility for different PCB designs.

Extended Supply Voltage Range Option:

LM2903DR (UMW) supports supply voltage range of 2V to 30V (single) or ±1V to ±15V (dual), which is slightly narrower than the LM393DGKR but remains compatible with standard industrial applications. This part is suitable for cost-sensitive designs where the reduced voltage range does not impact system requirements.

All recommended substitutes maintain RoHS3 compliance and MSL rating of 1 (Unlimited), ensuring manufacturing process compatibility with existing assembly procedures.

Frequently Asked Questions (FAQ)

Q: Can I use LM2903DGKR as a direct replacement for LM393DGKR without PCB modification?

A: Yes. LM2903DGKR is pin-for-pin compatible in the same 8-MSOP package. Electrical specifications are identical, and it carries active product status. No PCB redesign is required.

Q: What is the difference between 8-MSOP and 8-SOIC packages?

A: Both are 8-pin surface-mount packages but differ in pin pitch and body width. 8-MSOP has 0.118" width with tighter pin spacing, while 8-SOIC has 0.154" to 0.209" width with wider spacing. PCB footprints are not interchangeable; package selection depends on existing PCB design.

Q: Why do some substitutes have higher quiescent current (2.5mA vs. 1mA)?

A: The LM2903 series variants incorporate rail-to-rail output capability and enhanced performance features that result in slightly higher quiescent current consumption. For battery-powered or ultra-low-power applications, verify that the 2.5mA specification meets system power budget requirements.

Q: Are automotive-grade parts (AEC-Q100) necessary for my application?

A: Automotive qualification is required only for applications subject to automotive industry standards or operating in extended temperature environments (-40°C to 125°C or higher). For standard industrial or consumer applications operating at 0°C to 70°C, standard-grade parts are sufficient.

Q: What does "Rail-to-Rail" output mean?

A: Rail-to-rail output capability allows the comparator output to swing closer to the positive and negative supply rails, maximizing output voltage swing. This feature is beneficial for applications requiring maximum signal amplitude but is not mandatory for standard comparator operation.

Q: Can I substitute a part with lower input offset voltage (2mV vs. 7mV)?

A: Yes. Lower input offset voltage is a performance enhancement that improves precision. Parts like LM2903AVQPWRG4Q1 (2mV) can replace higher-offset parts without functional issues. The application will benefit from improved accuracy.

Q: What is MSL (Moisture Sensitivity Level) and why does it matter?

A: MSL indicates how sensitive a component is to moisture during storage and assembly. MSL 1 (Unlimited) means the part has no moisture sensitivity restrictions and can be stored indefinitely without special precautions. All recommended substitutes carry MSL 1, ensuring compatibility with standard manufacturing processes.

Q: Are there supply voltage range differences I should consider?

A: Most substitutes support 2V to 36V (single) or ±1V to ±18V (dual), matching the LM393DGKR. LM2903DR has a slightly narrower range (2V to 30V / ±1V to ±15V), which is acceptable for most industrial applications but should be verified against system requirements.

Q: Which substitute offers the best long-term availability?

A: LM2903DGKR (Rohm Semiconductor), LM2903D (STMicroelectronics), and LM2903PWR (Texas Instruments) are all active products from established manufacturers with strong supply chain presence. These parts are recommended for new designs requiring long-term production support.

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