LM2931ACDG Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2931ACDG is a linear voltage regulator IC from onsemi designed for positive adjustable output applications with 100mA current capability in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM2931 series provides adjustable output voltage regulation with integrated over-current and over-temperature protection, suitable for low-power applications requiring stable voltage conversion from input sources up to 26V.

Key Parameters

Parameter	LM2931ACDG
Manufacturer	onsemi
Product Status	Obsolete
Output Configuration	Positive Adjustable
Current Output	100mA
Voltage Input (Max)	26V
Voltage Output (Min/Fixed)	2.7V
Voltage Output (Max)	29.5V
Voltage Dropout (Max)	0.6V @ 100mA
Quiescent Current	1 mA
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM2931ACDG is determined by the following critical parameters that must remain consistent across equivalent parts:

Output configuration (Positive Adjustable)
Current output capability (100mA)
Maximum input voltage (26V)
Package type (8-SOIC)
Mounting type (Surface Mount)
Output voltage range capability (minimum 2.7V or lower, maximum 29.5V or higher)
Protection features (Over Current and Over Temperature minimum)

The substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs. Variations in quiescent current, dropout voltage, supply current, and operating temperature range are secondary parameters that may differ between substitutes based on manufacturer implementation.

Parameter Comparison

Parameter	LM2931ACDG (onsemi)	LM2931CDR2G (onsemi)	LM2931CM/NOPB (TI)	LM2931CMX/NOPB (TI)
Product Status	Obsolete	Active	Active	Active
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Current Output	100mA	100mA	100mA	100mA
Voltage Input (Max)	26V	26V	26V	26V
Voltage Output (Min)	2.7V	2.7V	3V	3V
Voltage Output (Max)	29.5V	29.5V	24V	24V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.3V @ 100mA	0.3V @ 100mA
Quiescent Current	1 mA	1 mA	1 mA	1 mA
Supply Current (Max)	6 mA	6 mA	15 mA	15 mA
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Recommended for Direct Replacement): LM2931CDR2G from onsemi is the primary substitute for the obsolete LM2931ACDG. This part maintains identical electrical specifications including voltage output range (2.7V to 29.5V), dropout voltage (0.6V @ 100mA), and operating temperature range (-40°C ~ 125°C). The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The packaging format (Cut Tape & Digi-Reel) differs from the original but maintains the same 8-SOIC footprint.

Secondary Substitutes (Texas Instruments LM2931 Variants): LM2931CM/NOPB and LM2931CMX/NOPB from Texas Instruments are functionally compatible substitutes with the following considerations:

Both parts are in active production with ROHS3 compliance
Output voltage range is narrower (3V minimum vs. 2.7V minimum; 24V maximum vs. 29.5V maximum)
Dropout voltage is superior (0.3V @ 100mA vs. 0.6V @ 100mA)
Supply current is higher (15 mA maximum vs. 6 mA maximum)
Operating temperature range is reduced (-40°C ~ 85°C vs. -40°C ~ 125°C)
Protection features are enhanced (includes Reverse Polarity and Short Circuit protection)

These Texas Instruments variants are suitable for applications where the narrower output voltage range and reduced operating temperature ceiling are acceptable, and where the improved dropout voltage and enhanced protection features provide design benefits.

Frequently Asked Questions (FAQ)

Q: Can LM2931CDR2G directly replace LM2931ACDG in existing designs? A: Yes. LM2931CDR2G maintains identical electrical specifications and 8-SOIC package footprint. The primary difference is packaging format (Cut Tape & Digi-Reel vs. original packaging) and active production status. No circuit modifications are required.

Q: What are the key differences between onsemi and Texas Instruments LM2931 variants? A: The onsemi LM2931CDR2G maintains the original output voltage range (2.7V to 29.5V) and operating temperature range (-40°C ~ 125°C). Texas Instruments variants (LM2931CM/NOPB and LM2931CMX/NOPB) have a narrower output voltage range (3V to 24V), reduced operating temperature range (-40°C ~ 85°C), but superior dropout voltage (0.3V vs. 0.6V) and enhanced protection features.

Q: Are there packaging differences between these substitutes? A: All substitutes use the same 8-SOIC surface mount package with identical 0.154" (3.90mm) width. Differences exist only in supplier packaging formats: the original LM2931ACDG used standard packaging, LM2931CDR2G uses Cut Tape & Digi-Reel, and Texas Instruments variants use Bulk or Cut Tape & Digi-Reel formats. PCB footprint compatibility is maintained across all variants.

Q: Which substitute should I select for applications requiring extended temperature operation? A: LM2931CDR2G from onsemi supports the full -40°C ~ 125°C operating temperature range matching the original LM2931ACDG. Texas Instruments variants are limited to -40°C ~ 85°C and are not suitable for applications requiring operation above 85°C.

Q: What is the impact of different output voltage ranges on circuit design? A: If your design requires output voltages below 3V or above 24V, LM2931CDR2G must be used. Texas Instruments variants cannot achieve these voltage levels. For applications within the 3V to 24V range, all substitutes are compatible.

Q: Are all substitutes RoHS compliant? A: LM2931CDR2G, LM2931CM/NOPB, and LM2931CMX/NOPB are all ROHS3 compliant. All parts are REACH unaffected and carry EAR99 ECCN classification.

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