LM2931CM Equivalent & Substitute Parts

Part Overview

The LM2931CM is a linear voltage regulator IC from Texas Instruments, classified as a positive adjustable output regulator with 100mA current capacity in an 8-SOIC surface mount package. This device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this regulator topology.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	3V
Voltage - Output (Max)	24V
Current - Output	100mA
Voltage Dropout (Max)	0.3V @ 100mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM2931CM is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout compatibility without redesign.
Output Configuration & Type: Positive adjustable output with single regulator topology.
Electrical Performance: Maximum input voltage of 26V, adjustable output range, and 100mA output current capacity.
Mounting Type: Surface mount technology for automated assembly compatibility.

The substitute parts are grouped into two categories:

Category 1 - Direct Texas Instruments Equivalent: LM2931CM/NOPB maintains identical electrical specifications and Texas Instruments sourcing, differing only in packaging format (Bulk vs. standard).

Category 2 - onsemi Cross-Manufacturer Substitutes: LM2931ACDR2G, LM2931CDR2G, NCV2931ACDR2G, and NCV2931CDR2G are onsemi-manufactured alternatives with compatible electrical performance. The NCV2931 variants include automotive-grade qualification (AEC-Q100) and extended operating temperature range (-40°C ~ 125°C).

Parameter Comparison

Part Number	Manufacturer	Voltage Input (Max)	Voltage Output (Min)	Voltage Output (Max)	Dropout (Max)	Output Current	Operating Temp	Package	Product Status	Inventory
LM2931CM	Texas Instruments	26V	3V	24V	0.3V @ 100mA	100mA	-40°C ~ 85°C	8-SOIC	Last Time Buy	6069 Pcs
LM2931CM/NOPB	Texas Instruments	26V	3V	24V	0.3V @ 100mA	100mA	-40°C ~ 85°C	8-SOIC	Active	3752 Pcs
LM2931ACDR2G	onsemi	26V	2.7V	29.5V	0.6V @ 100mA	100mA	-40°C ~ 125°C	8-SOIC	Active	30200 Pcs
LM2931CDR2G	onsemi	26V	2.7V	29.5V	0.6V @ 100mA	100mA	-40°C ~ 125°C	8-SOIC	Active	10200 Pcs
NCV2931ACDR2G	onsemi	26V	2.7V	29.5V	0.6V @ 100mA	100mA	-40°C ~ 125°C	8-SOIC	Active	19610 Pcs
NCV2931CDR2G	onsemi	26V	2.7V	29.5V	0.6V @ 100mA	100mA	-40°C ~ 125°C	8-SOIC	Active	2006 Pcs

Engineering Selection Recommendations

For Direct Replacement (Preferred): LM2931CM/NOPB is the primary substitute, maintaining Texas Instruments sourcing with identical electrical specifications and active product status. This part is recommended when design continuity with the original manufacturer is required.

For Extended Temperature Applications: LM2931ACDR2G and LM2931CDR2G from onsemi provide extended operating temperature range (-40°C ~ 125°C) compared to the original LM2931CM (-40°C ~ 85°C). These parts are suitable for applications requiring higher temperature performance within the same electrical envelope.

For Automotive Applications: NCV2931ACDR2G and NCV2931CDR2G are automotive-grade variants with AEC-Q100 qualification. These parts are required for automotive or mission-critical applications where automotive-grade certification is mandatory. Both maintain the extended temperature range and are actively produced.

Supply Availability Consideration: onsemi variants (LM2931ACDR2G, LM2931CDR2G, NCV2931ACDR2G, NCV2931CDR2G) demonstrate higher inventory levels, providing improved supply chain security compared to the Last Time Buy status of the original LM2931CM.

All substitute parts maintain ROHS3 compliance, 8-SOIC package compatibility, and 100mA output current capacity. Selection should be based on application temperature requirements, automotive qualification needs, and supply chain strategy.

Frequently Asked Questions (FAQ)

Q: Can LM2931CM be directly replaced with LM2931CM/NOPB? A: Yes. LM2931CM/NOPB is a direct equivalent with identical electrical specifications. The difference is packaging format (Bulk vs. standard). Both are Texas Instruments products with the same 8-SOIC package footprint.

Q: What are the differences between Texas Instruments LM2931 and onsemi variants? A: onsemi LM2931ACDR2G and LM2931CDR2G variants offer extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C) and slightly higher maximum output voltage (29.5V vs. 24V). Dropout voltage is 0.6V versus 0.3V. All maintain 100mA output current and 8-SOIC packaging.

Q: Are NCV2931 parts suitable for non-automotive applications? A: Yes. NCV2931ACDR2G and NCV2931CDR2G are automotive-qualified variants but function identically to LM2931 variants in non-automotive designs. They provide the same electrical performance with additional automotive certification (AEC-Q100).

Q: Does the 8-SOIC package remain identical across all substitutes? A: Yes. All substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging. PCB layout and footprint remain unchanged across all listed alternatives.

Q: What is the impact of different dropout voltages (0.3V vs. 0.6V)? A: The LM2931CM specifies 0.3V dropout at 100mA, while onsemi variants specify 0.6V. Applications with tight input-to-output voltage margins must account for this difference. If the original design margin is less than 0.6V, onsemi variants may not be suitable without circuit redesign.

Q: Which substitute offers the best supply availability? A: LM2931ACDR2G from onsemi currently has the highest inventory (30200 Pcs), followed by NCV2931ACDR2G (19610 Pcs). Both provide superior supply security compared to the Last Time Buy status of LM2931CM.

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