LM393DG4 Equivalent & Substitute Parts

Part Overview

The LM393DG4 is a general-purpose dual comparator IC manufactured by Texas Instruments, featuring open-collector, rail-to-rail output configuration in an 8-SOIC surface-mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production support. The LM393 series base platform provides a stable foundation for sourcing compatible alternatives across multiple manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM393DG4
Manufacturer	Texas Instruments
Category	Linear
Description	IC COMPARATOR 2 DIFF 8SOIC
Package / Case	8-SOIC (0.154", 3.90mm Width)
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
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM393DG4 are classified based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain the following core parameters:

Critical Compatibility Parameters:

Package: 8-SOIC (0.154", 3.90mm Width) — identical footprint and pinout
Number of Elements: 2 — dual comparator configuration
Output Type: Open-Collector or Open-Collector/Open-Drain — functionally equivalent output stages
Voltage Supply Range: 2V ~ 36V, ±1V ~ 18V — identical supply specifications
Voltage - Input Offset (Max): 5mV @ 5V or 5mV @ 30V — within specification tolerance
Current - Input Bias (Max): 0.25µA @ 5V — matching input characteristics
Current - Quiescent (Max): ≤ 2.5mA — power consumption compatibility
Mounting Type: Surface Mount — identical assembly method
RoHS Status: ROHS3 Compliant — regulatory compliance maintained

Substitute parts are grouped into three categories:

MFR Recommended: Parts explicitly recommended by original manufacturers as direct replacements, including LM393DR (Rohm Semiconductor), LM393M/NOPB and LM393MX/NOPB (Texas Instruments).

Direct Equivalents: Parts with identical electrical specifications and active product status, including LM393D, LM393DT, and LM393WDT (STMicroelectronics).

Upgrade Options: Parts offering enhanced specifications or extended operating ranges while maintaining core compatibility, including AS393MTR-E1 and AS393MTR-G1 (Diodes Incorporated), LM193DT (STMicroelectronics), and LM293DR2G (onsemi).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input Offset (Max)	Current - Output (Typ)	Current - Quiescent (Max)	Operating Temperature	Packaging	Inventory
LM393DG4	Texas Instruments	Obsolete	5mV @ 30V	20mA	2.5mA	0°C ~ 70°C	8-SOIC	3200 Pcs
LM393DR	Rohm Semiconductor	Not For New Designs	7mV @ 5V	6mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	330200 Pcs
LM393M/NOPB	Texas Instruments	Active	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	5381 Pcs
LM393MX/NOPB	Texas Instruments	Active	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	82700 Pcs
LM393D	STMicroelectronics	Active	5mV @ 30V	18mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	44575 Pcs
LM393DT	STMicroelectronics	Active	5mV @ 30V	18mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	505100 Pcs
LM393WDT	STMicroelectronics	Active	5mV @ 30V	16mA @ 5V	2.5mA	0°C ~ 70°C	8-SOIC	2508 Pcs
AS393MTR-E1	Diodes Incorporated	Active	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	354160 Pcs
AS393MTR-G1	Diodes Incorporated	Active	5mV @ 5V	16mA @ 5V	1mA	-40°C ~ 85°C	8-SOIC	300400 Pcs
LM193DT	STMicroelectronics	Active	5mV @ 30V	18mA @ 5V	2.5mA	-55°C ~ 125°C	8-SOIC	78081 Pcs
LM293DR2G	onsemi	Active	5mV @ 30V	16mA @ 5V	2.5mA	-25°C ~ 85°C	8-SOIC	305300 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LM393MX/NOPB and LM393DT are the primary selections. Both maintain identical electrical specifications to the LM393DG4 while offering active product status. LM393MX/NOPB is available in higher volume (82700 Pcs) with cut-tape packaging suitable for automated assembly. LM393DT provides the largest inventory (505100 Pcs) and is available in cut-tape format for production environments.

For Extended Temperature Range Applications: LM193DT extends the operating temperature range to -55°C ~ 125°C while maintaining all core electrical parameters. This part is suitable for industrial and automotive applications requiring wider temperature performance. Product status is active with 78081 Pcs in inventory.

For Enhanced Quiescent Current Performance: AS393MTR-E1 and AS393MTR-G1 reduce quiescent current to 1mA (versus 2.5mA in the original) and extend operating temperature to -40°C ~ 85°C. These parts are manufactured by Diodes Incorporated and carry active product status with substantial inventory availability (354160 Pcs and 300400 Pcs respectively).

For Open-Drain Output Capability: LM293DR2G from onsemi provides open-collector and open-drain output options, offering additional design flexibility. Operating temperature range extends to -25°C ~ 85°C with active product status and 305300 Pcs in inventory.

All recommended substitutes maintain ROHS3 compliance and identical 8-SOIC packaging, ensuring PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LM393DG4 be directly replaced with LM393MX/NOPB? A: Yes. Both parts share identical electrical specifications, package configuration, and supply voltage ranges. The primary difference is product status: LM393DG4 is obsolete while LM393MX/NOPB is active. Pinout and footprint are identical, requiring no PCB modifications.

Q: What is the difference between LM393DT and LM393D? A: Both are manufactured by STMicroelectronics with identical electrical specifications. The difference is packaging format: LM393D is supplied in tube packaging, while LM393DT is supplied in cut-tape format. LM393DT offers significantly higher inventory (505100 Pcs versus 44575 Pcs) and is preferred for production environments.

Q: Are AS393MTR-E1 and AS393MTR-G1 interchangeable? A: Yes, electrically and mechanically. Both are manufactured by Diodes Incorporated with identical specifications. The difference is packaging: AS393MTR-E1 is tape & reel format, while AS393MTR-G1 is cut-tape & digi-reel format. Selection depends on assembly equipment compatibility.

Q: Why does LM193DT have a different operating temperature range? A: LM193DT is a military-grade variant of the LM393 series, extending the operating temperature range to -55°C ~ 125°C. All other electrical parameters remain identical. This part is suitable for applications requiring extended temperature performance beyond the standard 0°C ~ 70°C range.

Q: Can I use LM293DR2G as a substitute for LM393DG4? A: Yes, with consideration for output type. LM293DR2G provides open-collector and open-drain output options, whereas LM393DG4 provides open-collector and rail-to-rail output. The open-collector functionality is compatible. Operating temperature range is -25°C ~ 85°C, which covers the original 0°C ~ 70°C specification.

Q: What is the significance of the 8-SOIC package specification? A: The 8-SOIC (0.154", 3.90mm Width) package is a surface-mount configuration with identical pinout across all substitute parts. This ensures direct PCB compatibility without layout modifications. All substitute parts listed maintain this identical package specification.

Q: Does quiescent current difference affect circuit design? A: AS393MTR-E1 and AS393MTR-G1 reduce quiescent current to 1mA compared to 2.5mA in the original. This results in lower power consumption during idle states. For battery-powered or low-power applications, this represents a 60% reduction in standby current draw. Circuit design remains unchanged; the benefit is purely in power efficiency.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the original LM393DG4 specification. This ensures regulatory compliance for applications subject to RoHS directives.

Q: What packaging options are available for production? A: Substitute parts are available in three packaging formats: tube (LM393M/NOPB, LM393D), cut-tape & digi-reel (LM393MX/NOPB, LM393DT, AS393MTR-G1, LM193DT, LM293DR2G), and tape & reel (LM393WDT, AS393MTR-E1). Selection depends on assembly equipment and production volume requirements.

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