LM2931CDR2 Equivalent & Substitute Parts

Part Overview

The LM2931CDR2 is a linear voltage regulator IC from onsemi designed for positive adjustable output applications. This device delivers 100mA output current with adjustable voltage regulation from 2.7V to 29.5V, operating across the industrial temperature range of -40°C to 125°C. The LM2931CDR2 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Direct replacements and parametric equivalents are available from onsemi's active product portfolio.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the LM2931CDR2 is determined by strict equivalence across the following critical parameters:

Output Configuration: Positive
Output Type: Adjustable
Voltage - Input (Max): 26V
Voltage - Output (Min/Fixed): 2.7V
Voltage - Output (Max): 29.5V
Current - Output: 100mA
Voltage Dropout (Max): 0.6V @ 100mA
Current - Quiescent (Iq): 1 mA
Operating Temperature: -40°C ~ 125°C
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Protection Features: Over Current, Over Temperature

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Differences exist only in product status, packaging format (Cut Tape vs. Tape & Reel), RoHS compliance status, and automotive qualification where applicable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Voltage Input (Max)	Voltage Output Min/Max	Current Output	Dropout Voltage	Operating Temp	Package Type	RoHS Status	Automotive Grade
LM2931CDR2	onsemi	Obsolete	Cut Tape (CT)	26V	2.7V / 29.5V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-SOIC	RoHS non-compliant	No
LM2931CDR2G	onsemi	Active	Cut Tape (CT) & Digi-Reel®	26V	2.7V / 29.5V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant	No
LM2931ACDR2G	onsemi	Active	Cut Tape (CT) & Digi-Reel®	26V	2.7V / 29.5V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant	No
NCV2931ACDR2G	onsemi	Active	Tape & Reel (TR)	26V	2.7V / 29.5V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant	Yes (AEC-Q100)
NCV2931CDR2G	onsemi	Active	Cut Tape (CT)	26V	2.7V / 29.5V	100mA	0.6V @ 100mA	-40°C ~ 125°C	8-SOIC	ROHS3 Compliant	Yes (AEC-Q100)

Engineering Selection Recommendations

For RoHS3 Compliant Designs (Non-Automotive): LM2931CDR2G and LM2931ACDR2G are direct active replacements with identical electrical and mechanical specifications. Both are available in Cut Tape and Digi-Reel packaging formats. LM2931CDR2G offers the most direct substitution path with active product status and RoHS3 compliance.

For Automotive Applications (AEC-Q100 Required): NCV2931ACDR2G and NCV2931CDR2G provide automotive-grade equivalents with AEC-Q100 qualification. These parts maintain all electrical parameters while meeting automotive reliability standards. NCV2931ACDR2G is available in Tape & Reel format; NCV2931CDR2G is available in Cut Tape format.

For Legacy System Maintenance: When the obsolete LM2931CDR2 must remain in service, LM2931CDR2G provides the most direct replacement without requiring design modifications, though RoHS compliance status differs.

Frequently Asked Questions (FAQ)

Q: Can LM2931CDR2G directly replace LM2931CDR2 without circuit modifications? A: Yes. LM2931CDR2G maintains identical electrical specifications, output voltage range (2.7V to 29.5V), current output (100mA), dropout voltage (0.6V @ 100mA), and 8-SOIC package dimensions. No circuit redesign is required.

Q: What is the difference between LM2931ACDR2G and LM2931CDR2G? A: Both parts are electrically and mechanically identical. The "A" designation in LM2931ACDR2G indicates a different manufacturing grade or specification variant within onsemi's product line, but all critical parameters remain equivalent.

Q: When should I use NCV2931 variants instead of LM2931 variants? A: NCV2931ACDR2G and NCV2931CDR2G are automotive-qualified parts with AEC-Q100 certification. Use these variants for automotive applications, safety-critical systems, or when automotive-grade reliability is specified. For general industrial applications, LM2931 variants are appropriate.

Q: Does packaging format affect electrical performance? A: No. Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) packaging formats are identical in electrical performance and mechanical fit. Packaging selection depends on assembly equipment compatibility and procurement volume requirements.

Q: Are all substitute parts RoHS3 compliant? A: LM2931CDR2 is RoHS non-compliant. All active substitute parts (LM2931CDR2G, LM2931ACDR2G, NCV2931ACDR2G, NCV2931CDR2G) are ROHS3 compliant.

Q: Can I use NCV2931CDR2G in a non-automotive application? A: Yes. NCV2931CDR2G exceeds the requirements for non-automotive applications. Automotive-qualified parts can be used in general industrial designs without performance or reliability concerns.

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