LM2931S-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2931S-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 100mA in a TO-263 (DDPAK-3) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides regulated 5V output with integrated protection features including over-temperature, reverse polarity, and short-circuit protection across an operating temperature range of -40°C to 85°C.

Substiute Parts

LM2931S-5.0

Texas InstrumentsIn Stock: 12186LM2931S-5.0 Datasheet

Current PartRFQ

LM2931S-5.0/NOPB

Texas InstrumentsIn Stock: 1756LM2931S-5.0/NOPB Datasheet

DirectRFQ

LM2931AS-5.0/NOPB

National SemiconductorIn Stock: 2266LM2931AS-5.0/NOPB Datasheet

Parametric EquivalentRFQ

MIC29310-5.0WU

Microchip TechnologyIn Stock: 1444MIC29310-5.0WU Datasheet

MFR RecommendedRFQ

MIC29310-5.0WU-TR

Microchip TechnologyIn Stock: 1234MIC29310-5.0WU-TR Datasheet

MFR RecommendedRFQ

MIC5237-5.0YU

Microchip TechnologyIn Stock: 12202MIC5237-5.0YU Datasheet

MFR RecommendedRFQ

MIC5237-5.0YU-TR

Microchip TechnologyIn Stock: 692MIC5237-5.0YU-TR Datasheet

MFR RecommendedRFQ

TLE42744GV50ATMA1

Infineon TechnologiesIn Stock: 2086TLE42744GV50ATMA1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2931S-5.0 is determined by the following critical parameters:

• Output voltage fixed at 5V
• Output current capability of 100mA or greater
• TO-263 package compatibility (D2PAK 3 Leads + Tab)
• Surface mount mounting type
• Protection features: Over Temperature, Reverse Polarity, Short Circuit
• Operating temperature range compatibility

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and packaging from the same manufacturer, differing only in packaging format or product status.

Parametric Equivalent: Parts meeting or exceeding all critical electrical parameters with the same package type, allowing functional replacement in the same circuit.

Manufacturer Recommended Alternatives: Parts with enhanced specifications (higher current output, improved performance metrics) in compatible packaging, suitable for designs requiring additional performance margin.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Active Product Status): LM2931S-5.0/NOPB is the primary direct equivalent, offering identical electrical specifications to the obsolete LM2931S-5.0 with the advantage of active product status and ROHS3 compliance. This part maintains the same 100mA output current, 0.3V dropout voltage, and 55dB PSRR performance.

For Enhanced Performance with Compliance: MIC5237-5.0YU and MIC5237-5.0YU-TR provide 500mA output current capability while maintaining TO-263 package compatibility. These parts offer improved PSRR (75dB) and extended operating temperature range (-40°C to 125°C) with ROHS3 compliance. The tape & reel variant (MIC5237-5.0YU-TR) is suitable for automated assembly processes.

For High-Current Applications: MIC29310-5.0WU and MIC29310-5.0WU-TR deliver 3A output current in the same TO-263 package, providing significant performance margin for designs requiring higher current delivery. These parts include over-current protection and maintain ROHS3 compliance.

For Automotive and Extended Temperature Range: TLE42744GV50ATMA1 from Infineon Technologies offers automotive-grade qualification (AEC-Q100) with extended operating temperature range (-40°C to 150°C), 40V maximum input voltage, and 400mA output current. This part includes enhanced protection features and is suitable for automotive and industrial applications requiring higher reliability standards.

Frequently Asked Questions (FAQ)

Q: Can LM2931S-5.0/NOPB be used as a direct replacement for the obsolete LM2931S-5.0? A: Yes. LM2931S-5.0/NOPB is electrically and mechanically identical to the obsolete part, with the primary differences being active product status and ROHS3 compliance. Both parts deliver 100mA at 5V output with 0.3V dropout voltage and identical protection features.

Q: What is the key difference between MIC5237-5.0YU and MIC29310-5.0WU? A: The MIC5237 series provides 500mA output current with 0.7V dropout at rated current, while the MIC29310 series delivers 3A output current with 1V dropout at rated current. Selection depends on the application's current requirements. Both maintain TO-263 package compatibility.

Q: Are all substitute parts available in the same TO-263 package? A: Yes. All listed substitute parts use the TO-263-4 (D2PAK with 3 Leads + Tab) package, ensuring mechanical compatibility with the original LM2931S-5.0 footprint.

Q: Which substitute part offers the best PSRR performance? A: LM2931AS-5.0/NOPB provides 80dB PSRR at 120Hz, the highest among the listed substitutes. MIC5237 series offers 75dB PSRR, while TLE42744GV50ATMA1 provides 60dB PSRR at 100Hz.

Q: What is the operating temperature difference between the main part and substitutes? A: The obsolete LM2931S-5.0 operates from -40°C to 85°C. Most active substitutes extend this range to -40°C to 125°C. The TLE42744GV50ATMA1 offers the widest range at -40°C to 150°C, suitable for automotive and industrial applications.

Q: Are tape & reel variants functionally equivalent to tube-packaged parts? A: Yes. Tape & reel variants (identified by -TR suffix) contain identical die and electrical specifications to their tube-packaged counterparts. The packaging format differs only for automated assembly compatibility; electrical performance is identical.

Q: Which substitute part is recommended for new designs requiring RoHS compliance? A: All active substitute parts listed are ROHS3 compliant. LM2931S-5.0/NOPB provides the closest electrical match with compliance, while MIC5237 and MIC29310 series offer enhanced current capability with compliance.