LM393WDT Equivalent & Substitute Parts

Part Overview

The LM393WDT is a dual general-purpose comparator manufactured by Rohm Semiconductor in 8-SOP 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 LM393WDT is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM393WDT
Manufacturer	Rohm Semiconductor
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)	16mA @ 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)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM393WDT is determined by the following critical parameters:

Number of Elements: Must be 2 (dual comparator)
Output Type: Must be Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±): Must support 2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max): Must not exceed 7mV @ 5V
Current - Input Bias (Max): Must not exceed 0.25µA @ 5V
Current - Output (Typ): Must support minimum 16mA @ 5V
Current - Quiescent (Max): Must not exceed 2.5mA
Operating Temperature: Must support minimum 0°C ~ 70°C
Package / Case: Must be 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Must be Surface Mount

Substitute parts are categorized as follows:

Parametric Equivalents: Parts meeting all critical electrical and mechanical parameters with identical or superior specifications.

Upgrade Parts: Parts exceeding the LM393WDT specifications with extended operating temperature ranges or automotive-grade qualifications, suitable for applications requiring enhanced performance or reliability.

Similar Parts: Parts meeting core functional requirements but with variations in supply voltage range, output current capability, or quiescent current that may require application-level verification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Voltage - Supply (V)	Input Offset Max (mV)	Input Bias Max (µA)	Output Current Typ (mA)	Quiescent Max (mA)	Temp Range (°C)	Package
LM393WDT	Rohm Semiconductor	Obsolete	Open-Collector, Rail-to-Rail	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	0 ~ 70	8-SOIC
LM393DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	5 @ 30V	0.25 @ 5V	18 @ 5V	2.5	0 ~ 70	8-SOIC
LM393MX	onsemi	Obsolete	Open-Collector	2-36, ±1-18	5 @ 5V	0.25 @ 5V	18 @ 5V	2.5	0 ~ 70	8-SOIC
LM2903DT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 125	8-SOIC
LM2903HYDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 150	8-SOIC
LM2903YDT	STMicroelectronics	Active	Open-Collector, Rail-to-Rail	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 ~ 125	8-SOIC
AS393AMTR-E1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	3 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85	8-SOIC
AS393MTR-E1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85	8-SOIC
AS393MTR-G1	Diodes Incorporated	Active	Open-Collector	2-36, ±1-18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 ~ 85	8-SOIC
AZV393MMTR-G1	Diodes Incorporated	Active	Open-Collector	2.5-5.5	7 @ 5V	0.25 @ 5V	84 @ 5V	0.2	-40 ~ 85	8-MSOP
AZV393MTR-E1	Diodes Incorporated	Active	Open-Collector	2.5-5.5	7 @ 5V	0.25 @ 5V	84 @ 5V	0.2	-40 ~ 85	8-SOIC

Engineering Selection Recommendations

For Direct Replacement (Active Status)

LM393DT (STMicroelectronics) is the primary parametric equivalent. It maintains identical supply voltage range, input bias current, quiescent current, and package configuration. The device is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and supply chain stability.

For Extended Temperature Applications

LM2903DT and LM2903YDT (STMicroelectronics) extend the operating temperature range to -40°C ~ 125°C while maintaining all critical electrical parameters. LM2903YDT includes automotive-grade qualification (AEC-Q100), suitable for automotive and industrial applications requiring enhanced reliability. LM2903HYDT further extends the upper temperature limit to 150°C with automotive qualification.

For Reduced Quiescent Current

AS393AMTR-E1, AS393MTR-E1, and AS393MTR-G1 (Diodes Incorporated) reduce quiescent current to 1mA maximum, providing power efficiency benefits. These devices maintain the full supply voltage range and output current specifications. Operating temperature range is -40°C ~ 85°C.

For High-Current Output Applications

AZV393MMTR-G1 and AZV393MTR-E1 (Diodes Incorporated) provide significantly higher output current (84mA typical) and lower quiescent current (200µA maximum). These devices operate within a restricted supply voltage range of 2.5V ~ 5.5V and are available in 8-MSOP and 8-SOIC packages respectively. Propagation delay is specified at 450ns maximum.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the LM393WDT.

Frequently Asked Questions (FAQ)

Q: Can LM393DT be used as a direct replacement for LM393WDT?

A: Yes. LM393DT meets all critical electrical parameters of the LM393WDT, including supply voltage range (2V ~ 36V, ±1V ~ 18V), input offset voltage, input bias current, output current, quiescent current, and operating temperature range (0°C ~ 70°C). Both use 8-SOIC packaging. LM393DT is in active production status, addressing the obsolescence of the LM393WDT.

Q: What is the difference between LM2903DT and LM2903YDT?

A: Both devices are manufactured by STMicroelectronics and share identical electrical specifications. The primary difference is automotive-grade qualification: LM2903YDT includes AEC-Q100 certification, making it suitable for automotive applications. Both extend the operating temperature range to -40°C ~ 125°C compared to the LM393WDT's 0°C ~ 70°C.

Q: Why do AS393 series parts have lower quiescent current?

A: AS393AMTR-E1, AS393MTR-E1, and AS393MTR-G1 are designed with reduced quiescent current specifications (1mA maximum versus 2.5mA for the LM393WDT). This design characteristic provides power efficiency benefits in battery-powered or low-power applications while maintaining the same supply voltage range and output current capability.

Q: Can AZV393 series parts replace the LM393WDT?

A: AZV393 series parts are not direct replacements due to restricted supply voltage range (2.5V ~ 5.5V versus 2V ~ 36V for the LM393WDT). However, for applications operating within the 2.5V ~ 5.5V range, these devices offer significantly higher output current (84mA) and lower quiescent current (200µA). AZV393MMTR-G1 uses 8-MSOP packaging; AZV393MTR-E1 uses 8-SOIC packaging.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the LM393WDT.

Q: What packaging options are available for LM393WDT substitutes?

A: Most substitute parts use 8-SOIC (0.154", 3.90mm Width) packaging, maintaining mechanical compatibility with the LM393WDT. AZV393MMTR-G1 is available in 8-MSOP (0.118", 3.00mm Width) packaging, which requires PCB layout modification due to different pin spacing and body dimensions.

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

A: LM393DT (STMicroelectronics) is recommended for long-term availability. It is in active production status with high inventory levels (505,100 pcs), ROHS3 compliance, and unlimited moisture sensitivity rating. This ensures consistent supply chain support and production continuity.

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