LM340MP-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM340MP-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 1.5A in SOT-223-4 surface mount packaging. This part is classified as Last Time Buy, indicating limited availability. Equivalent and substitute parts are necessary to ensure design continuity, manage supply chain risks, and accommodate alternative sourcing strategies while maintaining electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	1.5A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A
Quiescent Current	8 mA
PSRR	70dB (120Hz)
Protection Features	Over Current, Short Circuit
Operating Temperature	0°C ~ 125°C
Package	SOT-223-4
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM340MP-5.0 is determined by the following critical parameters:

Output voltage matching at 5V fixed
Output current capability (minimum 1.5A for direct substitution; lower ratings indicate functional limitation)
Maximum input voltage tolerance (35V or higher)
Voltage dropout specification (2V @ 1A or lower)
Package compatibility (SOT-223-4 or equivalent footprint)
Surface mount mounting type
Protection features (Over Current and/or Short Circuit)
Operating temperature range (0°C ~ 125°C minimum)
RoHS3 compliance

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (different output current ratings or package variants with compatible electrical characteristics).

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout (Max)	Quiescent Current	Package	Product Status	Operating Temp
LM340MP-5.0	Texas Instruments	1.5A	35V	2V @ 1A	8 mA	SOT-223-4	Last Time Buy	0°C ~ 125°C
LM340MP-5.0/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	8 mA	SOT-223-4	Active	0°C ~ 125°C
LM340MPX-5.0/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	8 mA	SOT-223-4	Active	0°C ~ 125°C
L5150BNTR	STMicroelectronics	150mA	40V	0.5V @ 150mA	80 µA	SOT-223	Active	-40°C ~ 150°C
MC7805BDTRKG	onsemi	1A	35V	2V @ 1A	8 mA	DPAK	Active	-40°C ~ 125°C
NCV2931AST-5T3G	onsemi	100mA	26V	0.6V @ 100mA	1 mA	SOT-223	Active	-40°C ~ 125°C

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitution):

LM340MP-5.0/NOPB and LM340MPX-5.0/NOPB are parametric equivalents of the LM340MP-5.0. Both parts maintain identical electrical specifications including 1.5A output current, 35V maximum input voltage, 2V dropout, and 8 mA quiescent current. Both are Active product status with ROHS3 compliance. These parts are suitable for direct substitution in applications requiring the full 1.5A output capability.

Manufacturer-Recommended Alternatives:

L5150BNTR (STMicroelectronics) is an automotive-grade alternative with AEC-Q100 qualification. Output current is limited to 150mA, making it suitable only for applications requiring less than 150mA. Input voltage tolerance is higher at 40V. Operating temperature range extends to -40°C ~ 150°C. Package is SOT-223 (compatible footprint).

MC7805BDTRKG (onsemi) provides 1A output current in DPAK package. Input voltage and dropout specifications match the main part. Operating temperature range extends to -40°C. This part is suitable for applications where 1A output is sufficient and DPAK package is acceptable.

NCV2931AST-5T3G (onsemi) is an automotive-grade alternative with AEC-Q100 qualification. Output current is limited to 100mA, suitable only for low-current applications. Input voltage tolerance is 26V maximum. This part is not suitable for applications requiring the full 1.5A output of the main part.

Selection Basis:

Parts with Active product status are preferred over Last Time Buy for long-term availability
ROHS3 compliance is maintained across all listed alternatives
Output current capability must match or exceed application requirements
Package compatibility and thermal characteristics must align with PCB design constraints

Frequently Asked Questions (FAQ)

Q: Can LM340MP-5.0/NOPB directly replace LM340MP-5.0?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (1.5A output, 35V input max, 2V dropout, 8 mA quiescent current) and SOT-223-4 packaging. The primary difference is product status: LM340MP-5.0/NOPB is Active while LM340MP-5.0 is Last Time Buy.

Q: What is the difference between LM340MP-5.0/NOPB and LM340MPX-5.0/NOPB?

A: Both parts are parametric equivalents with identical electrical and package specifications. The difference lies in manufacturing process or qualification level, but electrical performance and pinout are equivalent for substitution purposes.

Q: Can L5150BNTR replace LM340MP-5.0 in all applications?

A: No. L5150BNTR has a maximum output current of 150mA, compared to 1.5A for the LM340MP-5.0. It is suitable only for applications requiring 150mA or less. Applications requiring the full 1.5A output cannot use this part.

Q: Why is MC7805BDTRKG in a different package (DPAK)?

A: MC7805BDTRKG uses DPAK (TO-252-3) package instead of SOT-223-4. While both are surface mount packages, they have different footprints and thermal characteristics. DPAK provides better thermal dissipation due to the larger tab. This part is suitable only if the PCB layout accommodates DPAK footprint.

Q: Is NCV2931AST-5T3G suitable for high-current applications?

A: No. NCV2931AST-5T3G has a maximum output current of 100mA. It is designed for low-current applications only and cannot provide the 1.5A output of the main part.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive-grade qualification indicating the part meets automotive industry reliability and quality standards. Parts with this qualification (L5150BNTR and NCV2931AST-5T3G) are suitable for automotive applications but are not required for general industrial or consumer applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the main part LM340MP-5.0.

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