LM2931CDG Equivalent & Substitute Parts

Part Overview

The LM2931CDG 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 substitutes necessary for new designs and ongoing production requirements. The LM2931CDG provides adjustable output voltage regulation with integrated over-current and over-temperature protection features.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2931CDG
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
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LM2931CDG are identified based on the following critical parameters that determine functional equivalence:

Package compatibility: 8-SOIC surface mount package with identical 0.154" (3.90mm) width
Output configuration: Positive adjustable voltage regulation
Current rating: 100mA output capability
Maximum input voltage: 26V
Mounting type: Surface mount technology

The substitute parts LM2931CM/NOPB and LM2931CMX/NOPB from Texas Instruments share the same base product number (LM2931) and meet all critical electrical and mechanical parameters. Both substitutes are active products with enhanced protection features and improved specifications compared to the obsolete LM2931CDG.

Parameter Comparison

Parameter	LM2931CDG (onsemi)	LM2931CM/NOPB (TI)	LM2931CMX/NOPB (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	26V	26V	26V
Voltage - Output (Min/Fixed)	2.7V	3V	3V
Voltage - Output (Max)	29.5V	24V	24V
Voltage Dropout (Max)	0.6V @ 100mA	0.3V @ 100mA	0.3V @ 100mA
Current - Output	100mA	100mA	100mA
Current - Quiescent (Iq)	1 mA	1 mA	1 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both LM2931CM/NOPB and LM2931CMX/NOPB are suitable replacements for the obsolete LM2931CDG. The Texas Instruments substitutes offer the following advantages:

Active product status: Both substitutes are currently in active production, ensuring long-term availability and supply chain stability
Enhanced protection: Texas Instruments versions include reverse polarity and short circuit protection in addition to over-temperature protection
Improved dropout voltage: 0.3V @ 100mA compared to 0.6V @ 100mA on the original part, resulting in better efficiency
RoHS3 compliance: Both substitutes meet current environmental regulations
Identical packaging: 8-SOIC surface mount package ensures direct PCB compatibility

The primary difference between LM2931CM/NOPB and LM2931CMX/NOPB is packaging format: LM2931CM/NOPB is supplied in bulk, while LM2931CMX/NOPB is supplied in cut tape and Digi-Reel format. Selection between these two should be based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2931CM/NOPB and LM2931CMX/NOPB be used interchangeably with LM2931CDG?

A: Yes. Both Texas Instruments parts are functionally equivalent to the LM2931CDG. They share identical package geometry (8-SOIC), output configuration (positive adjustable), current rating (100mA), and maximum input voltage (26V). The parts are pin-compatible and can be used as direct replacements on existing PCBs.

Q: What is the difference between LM2931CM/NOPB and LM2931CMX/NOPB?

A: The electrical specifications and performance characteristics are identical between these two parts. The difference is in packaging format: LM2931CM/NOPB is supplied in bulk packaging, while LM2931CMX/NOPB is supplied in cut tape and Digi-Reel format. Selection depends on your assembly process and procurement preferences.

Q: Are there any output voltage range differences I should consider?

A: The LM2931CDG specifies a minimum output voltage of 2.7V and maximum of 29.5V. The Texas Instruments substitutes specify 3V minimum and 24V maximum. For applications requiring output voltages below 3V or above 24V, the original LM2931CDG specifications should be verified against your circuit requirements before substitution.

Q: What are the operating temperature differences?

A: The LM2931CDG operates from -40°C to 125°C, while both Texas Instruments substitutes operate from -40°C to 85°C. For applications requiring operation above 85°C, the original part's extended temperature range may be necessary.

Q: Do the substitutes have better protection features?

A: Yes. The Texas Instruments LM2931CM/NOPB and LM2931CMX/NOPB include reverse polarity and short circuit protection in addition to over-temperature protection. The original LM2931CDG includes over-current and over-temperature protection. The enhanced protection in the substitutes provides additional circuit safeguards.

Q: Are these parts RoHS compliant?

A: The Texas Instruments substitutes (LM2931CM/NOPB and LM2931CMX/NOPB) are ROHS3 compliant. RoHS status for the original LM2931CDG is not specified in the available data.

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