LM2931MX-5.0 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2931MX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output applications with 100mA current capacity in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring 5V regulation with low dropout characteristics.

Key Parameters

Parameter	LM2931MX-5.0
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	26V
Voltage Dropout (Max)	0.3V @ 100mA
Quiescent Current	1 mA
Package	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM2931MX-5.0 is determined by the following critical parameters:

Output voltage fixed at 5V
Output current capacity of 100mA minimum
Input voltage maximum of 26V
8-SOIC package compatibility
Surface mount mounting type
ROHS3 compliance

Substitute parts are grouped into two categories based on parametric equivalence and manufacturer recommendation status:

Parametric Equivalents: Parts with identical electrical specifications and packaging that provide direct functional replacement.

Manufacturer Recommended Alternatives: Parts from alternative manufacturers (onsemi, STMicroelectronics) that meet or exceed the core electrical requirements while offering different packaging options or enhanced performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp	Package	Packaging Type	Product Status
LM2931MX-5.0	Texas Instruments	5V	100mA	26V	0.3V @ 100mA	1 mA	55dB	-40°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Last Time Buy
LM2931AMX-5.0/NOPB	Texas Instruments	5V	100mA	26V	0.3V @ 100mA	15 mA	80dB	-40°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Active
LM2931MX-5.0/NOPB	Texas Instruments	5V	100mA	26V	0.3V @ 100mA	1 mA	55dB	-40°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Active
LM2931AD-5.0G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	90dB	-40°C ~ 125°C	8-SOIC	Tube	Active
LM2931AD-5.0R2G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	90dB	-40°C ~ 125°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Active
LM2931AD50R	STMicroelectronics	5V	100mA	26V	0.6V @ 100mA	1 mA	75dB	-40°C ~ 125°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Active
LM2931D-5.0R2G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	90dB	-40°C ~ 125°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Active
NCV2931AD-5.0R2G	onsemi	5V	100mA	26V	0.6V @ 100mA	1 mA	90dB	-40°C ~ 125°C	8-SOIC	Tape & Reel (TR)	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): LM2931MX-5.0/NOPB from Texas Instruments provides identical electrical performance and packaging to the original part. This option maintains the original design specifications with active product status and established supply availability.

Texas Instruments Alternative: LM2931AMX-5.0/NOPB offers improved PSRR performance (80dB vs 55dB) while maintaining identical dropout voltage and package specifications. The increased quiescent current (15mA vs 1mA) must be evaluated for power budget impact in battery-powered applications.

onsemi Alternatives: LM2931AD-5.0R2G, LM2931D-5.0R2G, and LM2931AD-5.0G provide extended operating temperature range (-40°C to 125°C vs -40°C to 85°C), improved PSRR (90dB), and active product status. These parts accept higher dropout voltage (0.6V vs 0.3V). Packaging options include Cut Tape & Digi-Reel® and Tube formats.

STMicroelectronics Alternative: LM2931AD50R from STMicroelectronics meets core electrical requirements with extended temperature range and Cut Tape & Digi-Reel® packaging. PSRR performance is 75dB with 0.6V dropout voltage specification.

Automotive Grade Option: NCV2931AD-5.0R2G is AEC-Q100 qualified for automotive applications with Tape & Reel packaging. This part is suitable for designs requiring automotive-grade components with extended temperature operation.

All substitute parts maintain ROHS3 compliance and 8-SOIC package compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can LM2931MX-5.0/NOPB directly replace LM2931MX-5.0? A: Yes. Both parts are from Texas Instruments with identical electrical specifications, output voltage, current capacity, dropout voltage, and 8-SOIC packaging. The primary difference is product status (Active vs Last Time Buy) and packaging format (Cut Tape & Digi-Reel®).

Q: What is the impact of increased dropout voltage in onsemi and STMicroelectronics alternatives? A: The onsemi and STMicroelectronics parts specify 0.6V dropout at 100mA compared to 0.3V for the original part. This affects minimum input voltage requirements for regulated output. Applications with tight input voltage margins must account for this 0.3V difference in system design.

Q: Are onsemi alternatives suitable for extended temperature applications? A: Yes. onsemi parts (LM2931AD-5.0R2G, LM2931D-5.0R2G, LM2931AD-5.0G) operate from -40°C to 125°C, extending the upper temperature limit by 40°C compared to the original -40°C to 85°C specification. This makes them suitable for industrial and automotive environments.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in Cut Tape & Digi-Reel® (standard for high-volume production), Tube (for lower volumes), and Tape & Reel (for automated assembly). All maintain the 8-SOIC form factor.

Q: Is NCV2931AD-5.0R2G compatible with non-automotive applications? A: Yes. NCV2931AD-5.0R2G is AEC-Q100 qualified but functionally equivalent to standard LM2931 parts. It can be used in non-automotive designs where automotive-grade reliability is desired.

Q: How does improved PSRR in substitute parts affect circuit performance? A: Higher PSRR (Power Supply Rejection Ratio) indicates better rejection of input voltage noise. onsemi parts offer 90dB PSRR compared to 55dB in the original, providing superior noise filtering for sensitive analog circuits.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, meeting environmental and regulatory requirements equivalent to the original part.

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