LM2931ACD Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2931ACD is a linear voltage regulator IC from onsemi designed for positive adjustable output applications with 100mA current capacity in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM2931ACD operates across an input voltage range of up to 26V with adjustable output from 2.7V to 29.5V, featuring integrated over-current and over-temperature protection.

Key Parameters

Parameter	LM2931ACD (Main Part)
Manufacturer	onsemi
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
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 LM2931ACD are identified based on strict electrical and mechanical compatibility criteria. The following parameters must align for valid substitution:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures PCB footprint compatibility
Output Configuration: Positive — maintains circuit topology requirements
Output Type: Adjustable — preserves design functionality
Number of Regulators: 1 — confirms single-output architecture
Voltage - Input (Max): 26V — ensures input voltage handling capability
Current - Output: 100mA — maintains current delivery specification
Mounting Type: Surface Mount — confirms assembly process compatibility

The identified substitutes (LM2931CM/NOPB and LM2931CMX/NOPB, both from Texas Instruments) meet all mandatory electrical and mechanical parameters. Both parts share the same base product number (LM2931) and are active products with enhanced compliance status.

Parameter Comparison

Parameter	LM2931ACD (onsemi)	LM2931CM/NOPB (TI)	LM2931CMX/NOPB (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1
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
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Protection Features	Over Current, Over Temperature	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit

Engineering Selection Recommendations

Both LM2931CM/NOPB and LM2931CMX/NOPB from Texas Instruments are direct functional substitutes for the obsolete LM2931ACD. Selection between these two Texas Instruments variants depends on packaging and supply requirements:

LM2931CM/NOPB is supplied in Bulk packaging with 3752 units in stock inventory.

LM2931CMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® packaging with 2200 units in stock inventory.

Both substitutes offer improved product status (Active vs. Obsolete), enhanced RoHS3 compliance, and superior protection features including reverse polarity and short circuit protection. The Texas Instruments variants feature lower dropout voltage (0.3V vs. 0.6V) and higher PSRR (55dB at 120Hz), providing performance advantages in noise-sensitive applications.

Design consideration: The Texas Instruments substitutes specify a minimum output voltage of 3V compared to the LM2931ACD's 2.7V minimum. Applications requiring output voltages below 3V require design review to confirm compatibility with the substitute parts.

Frequently Asked Questions (FAQ)

Q: Can LM2931CM/NOPB and LM2931CMX/NOPB be used interchangeably with LM2931ACD?

A: Both Texas Instruments parts are electrically and mechanically compatible with the LM2931ACD. The primary difference is packaging format: LM2931CM/NOPB is supplied in Bulk, while LM2931CMX/NOPB is supplied in Cut Tape & Digi-Reel. Both share identical electrical specifications and 8-SOIC package dimensions.

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

A: These parts are functionally identical. The difference is in packaging and supply format. LM2931CM/NOPB uses Bulk packaging, while LM2931CMX/NOPB uses Cut Tape (CT) & Digi-Reel® packaging. Selection depends on assembly process requirements and procurement volume.

Q: Are there any output voltage limitations when substituting with Texas Instruments parts?

A: The Texas Instruments substitutes (LM2931CM/NOPB and LM2931CMX/NOPB) specify a minimum adjustable output voltage of 3V, compared to the LM2931ACD's 2.7V minimum. Applications requiring output voltages below 3V must be reviewed for compatibility.

Q: What are the compliance differences between the original and substitute parts?

A: The LM2931ACD is RoHS non-compliant. Both Texas Instruments substitutes (LM2931CM/NOPB and LM2931CMX/NOPB) are ROHS3 compliant, providing improved environmental and regulatory compliance for new designs.

Q: Do the substitute parts offer improved protection features?

A: Yes. The Texas Instruments substitutes include reverse polarity and short circuit protection in addition to over-temperature protection. The LM2931ACD includes only over-current and over-temperature protection.

Q: What is the operating temperature range difference?

A: The LM2931ACD operates from -40°C to 125°C. The Texas Instruments substitutes operate from -40°C to 85°C. Applications requiring operation above 85°C must be reviewed for compatibility.

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