LM2931ASX-5.0 Equivalent & Substitute Parts

Part Overview

The LM2931ASX-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 5V output at 100mA with a maximum dropout voltage of 0.3V at rated current. The device is housed in a TO-263 (DDPAK-3) surface mount package and includes integrated protection features for over-temperature, reverse polarity, and short-circuit conditions.

This part 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 5V linear regulation at 100mA output capacity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Maximum Input Voltage	26V
Dropout Voltage (Max)	0.3V @ 100mA
Quiescent Current	15mA
Operating Temperature Range	-40°C to 85°C
Package Type	TO-263-4 (D2PAK, 3 Leads + Tab)
Protection Features	Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM2931ASX-5.0 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Fixed output voltage of 5V
Surface mount TO-263 package configuration
Positive output configuration
Output current capability equal to or greater than 100mA
Maximum input voltage rating of 16V or higher
Protection features including over-temperature and reverse polarity protection
RoHS3 compliance

Grouping Logic:

Group 1 – Direct Parametric Equivalent: LM2931ASX-5.0/NOPB (Texas Instruments) matches all electrical and mechanical specifications identically, differing only in product status (Active vs. Last Time Buy).

Group 2 – Higher Current Capacity Substitutes: MIC29310-5.0WU and MIC29310-5.0WU-TR (Microchip Technology) provide 3A output current, exceeding the 100mA requirement. These devices maintain the same 5V output, TO-263 package, and protection features while offering greater design margin.

Group 3 – Intermediate Current Capacity Substitutes: MIC5237-5.0YU and MIC5237-5.0YU-TR (Microchip Technology) deliver 500mA output current, providing a mid-range alternative between the original 100mA and the 3A options. These maintain 5V output, TO-263 packaging, and equivalent protection.

Group 4 – Automotive-Grade Substitute: TLE42744GV50ATMA1 (Infineon Technologies) is an automotive-qualified device (AEC-Q100) with 400mA output capacity. It features extended input voltage tolerance (40V maximum), lower quiescent current (220µA), and extended operating temperature range (-40°C to 150°C), suitable for automotive and harsh environment applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Operating Temp Range	Product Status
LM2931ASX-5.0	Texas Instruments	5V	100mA	26V	0.3V @ 100mA	TO-263-4	-40°C to 85°C	Last Time Buy
LM2931ASX-5.0/NOPB	Texas Instruments	5V	100mA	26V	0.3V @ 100mA	TO-263-4	-40°C to 85°C	Active
MIC29310-5.0WU	Microchip Technology	5V	3A	16V	1V @ 3A	TO-263-4	0°C to 125°C	Active
MIC29310-5.0WU-TR	Microchip Technology	5V	3A	16V	1V @ 3A	TO-263-4	0°C to 125°C	Active
MIC5237-5.0YU	Microchip Technology	5V	500mA	16V	0.7V @ 500mA	TO-263-4	-40°C to 125°C	Active
MIC5237-5.0YU-TR	Microchip Technology	5V	500mA	16V	0.7V @ 500mA	TO-263-4	-40°C to 125°C	Active
TLE42744GV50ATMA1	Infineon Technologies	5V	400mA	40V	0.5V @ 250mA	TO-263-4	-40°C to 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select LM2931ASX-5.0/NOPB when exact parametric matching is required. This part maintains all electrical and mechanical characteristics of the original while offering Active product status and continued availability.

For Applications Requiring Extended Temperature Range: MIC5237-5.0YU or MIC5237-5.0YU-TR support operating temperatures from -40°C to 125°C, extending the upper limit by 40°C compared to the original LM2931ASX-5.0. These are suitable for industrial and extended-temperature applications.

For Automotive and High-Reliability Applications: TLE42744GV50ATMA1 is AEC-Q100 qualified and carries Automotive grade designation. It provides the widest input voltage range (40V maximum) and highest operating temperature ceiling (150°C), with MSL rating of 1 (Unlimited moisture sensitivity). This device is appropriate for automotive, aerospace, and mission-critical applications.

For Applications with Higher Current Margin: MIC29310-5.0WU and MIC29310-5.0WU-TR deliver 3A output capacity, providing substantial design margin above the 100mA requirement. These are recommended when future design scaling or load growth is anticipated.

Packaging Considerations: Tube packaging (MIC29310-5.0WU, MIC5237-5.0YU, TLE42744GV50ATMA1) is suitable for lower-volume production and prototyping. Tape & Reel packaging (MIC29310-5.0WU-TR, MIC5237-5.0YU-TR, LM2931ASX-5.0/NOPB) is required for automated assembly and high-volume manufacturing.

All substitute parts maintain RoHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can MIC29310-5.0WU replace LM2931ASX-5.0 in my design? A: Yes. The MIC29310-5.0WU provides 3A output current, which exceeds the 100mA requirement of the original part. Both devices deliver 5V fixed output in TO-263 packaging with equivalent protection features. The higher current capacity introduces no compatibility issues for applications drawing 100mA or less. Note that the MIC29310 has a maximum input voltage of 16V compared to 26V for the LM2931ASX-5.0, so verify your input voltage does not exceed 16V.

Q: What is the difference between MIC5237-5.0YU and MIC5237-5.0YU-TR? A: Both parts are electrically identical. The primary difference is packaging format: MIC5237-5.0YU is supplied in Tube packaging, while MIC5237-5.0YU-TR is supplied in Tape & Reel (TR) format. Tube packaging is used for manual assembly and lower volumes. Tape & Reel is required for automated pick-and-place assembly in high-volume production.

Q: Is TLE42744GV50ATMA1 suitable for non-automotive applications? A: Yes. While TLE42744GV50ATMA1 carries automotive qualification (AEC-Q100), it can be used in any application. Its automotive-grade specifications—including extended temperature range (-40°C to 150°C), higher input voltage tolerance (40V), and lower quiescent current (220µA)—make it suitable for industrial, medical, and harsh-environment applications beyond automotive use.

Q: Why does LM2931ASX-5.0/NOPB show Active status while LM2931ASX-5.0 is Last Time Buy? A: The /NOPB suffix indicates "No Lead (Pb)" RoHS-compliant packaging. This variant remains in active production as the standard offering. The original LM2931ASX-5.0 designation is being phased out. For new designs, specify LM2931ASX-5.0/NOPB to ensure continued availability.

Q: Can I use MIC5237-5.0YU if my application requires -40°C operation? A: Yes. MIC5237-5.0YU supports the full -40°C to 125°C operating range, matching the lower temperature limit of the original LM2931ASX-5.0 (-40°C to 85°C). The MIC5237 actually extends the upper temperature capability to 125°C.

Q: What is the impact of different dropout voltages between substitute parts? A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. The LM2931ASX-5.0 has 0.3V dropout at 100mA. Substitutes show varying dropout specifications: MIC5237 at 0.7V @ 500mA, MIC29310 at 1V @ 3A, and TLE42744 at 0.5V @ 250mA. Verify your minimum input voltage minus 5V output exceeds the substitute part's dropout specification at your actual load current.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 Compliant status and REACH Unaffected designation, maintaining regulatory alignment with the original LM2931ASX-5.0.

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