LM2931AMX-5.0 Equivalent & Substitute Parts

Part Overview

The LM2931AMX-5.0 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 5V positive output at 100mA in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LM2931 series provides thermal protection, reverse polarity protection, and short circuit protection across a -40°C to 85°C operating range with a maximum input voltage of 26V.

Substiute Parts

LM2931AMX-5.0

Texas InstrumentsIn Stock: 889105LM2931AMX-5.0 Datasheet

Current PartRFQ

LM2931AMX-5.0/NOPB

Texas InstrumentsIn Stock: 2849LM2931AMX-5.0/NOPB Datasheet

DirectRFQ

LM2931MX-5.0

Texas InstrumentsIn Stock: 15393LM2931MX-5.0 Datasheet

Parametric EquivalentRFQ

LM2931MX-5.0/NOPB

Texas InstrumentsIn Stock: 10275LM2931MX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LM2931AD-5.0G

onsemiIn Stock: 11961LM2931AD-5.0G Datasheet

MFR RecommendedRFQ

LM2931AD-5.0R2G

onsemiIn Stock: 27846LM2931AD-5.0R2G Datasheet

MFR RecommendedRFQ

LM2931AD50R

STMicroelectronicsIn Stock: 6444LM2931AD50R Datasheet

MFR RecommendedRFQ

LM2931D-5.0R2G

onsemiIn Stock: 5159LM2931D-5.0R2G Datasheet

MFR RecommendedRFQ

NCV2931AD-5.0R2G

onsemiIn Stock: 111115NCV2931AD-5.0R2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2931AMX-5.0 is determined by the following critical parameters:

• Output Voltage & Current: 5V fixed output at 100mA minimum
• Package Type: 8-SOIC surface mount form factor
• Input Voltage Rating: 26V maximum
• Protection Features: Thermal and short circuit protection required
• Mounting Compatibility: Surface mount only

Substitute parts are grouped into three categories:

1. Direct Manufacturer Equivalents (Texas Instruments): Parts with identical electrical specifications and packaging, differing only in product status or packaging format.

2. Parametric Equivalents (Texas Instruments): Parts meeting all functional requirements with minor variations in quiescent current and PSRR, maintaining full compatibility.

3. Manufacturer-Recommended Alternatives (onsemi, STMicroelectronics): Cross-manufacturer parts with equivalent or superior electrical performance, same package, and active product status.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility): LM2931AMX-5.0/NOPB is the primary substitute. It maintains identical electrical specifications and 8-SOIC packaging while offering active product status and ROHS3 compliance, eliminating the obsolescence issue of the original part.

For New Designs with Extended Temperature Range: LM2931AD-5.0R2G, LM2931D-5.0R2G, or LM2931AD50R are recommended. These parts extend the operating temperature range to -40°C to 125°C and provide active product status. The onsemi variants (LM2931AD-5.0R2G, LM2931D-5.0R2G) offer superior PSRR at 90dB compared to the original 80dB specification.

For Automotive Applications: NCV2931AD-5.0R2G is the qualified automotive-grade alternative, meeting AEC-Q100 standards with active product status and extended temperature range.

For Low-Power Applications: LM2931MX-5.0/NOPB reduces quiescent current from 15mA to 1mA while maintaining all functional requirements and active product status, suitable for battery-powered or low-standby-current designs.

All recommended substitutes maintain the 8-SOIC package footprint, 5V fixed output, 100mA output current, and 26V maximum input voltage rating. Voltage dropout increases from 0.3V to 0.6V in cross-manufacturer alternatives, which remains acceptable for most 5V regulation applications.

Frequently Asked Questions (FAQ)

Q: Can LM2931MX-5.0/NOPB replace LM2931AMX-5.0 directly? A: Yes. Both parts deliver 5V at 100mA in 8-SOIC packaging. LM2931MX-5.0/NOPB has lower quiescent current (1mA vs 15mA) and is actively produced with ROHS3 compliance, making it a superior direct replacement.

Q: What is the difference between LM2931AMX-5.0/NOPB and LM2931MX-5.0/NOPB? A: Both are Texas Instruments parts in 8-SOIC. The primary difference is quiescent current: LM2931AMX-5.0/NOPB draws 15mA while LM2931MX-5.0/NOPB draws 1mA. PSRR also differs (80dB vs 55dB). For most applications, LM2931MX-5.0/NOPB is preferred due to lower power consumption.

Q: Are onsemi LM2931AD variants pin-compatible? A: Yes. LM2931AD-5.0G, LM2931AD-5.0R2G, and LM2931D-5.0R2G are all onsemi-manufactured LM2931 regulators in 8-SOIC packaging with identical pinouts. They differ in packaging format (Tube vs Cut Tape & Digi-Reel) and inventory availability.

Q: What is the advantage of NCV2931AD-5.0R2G over standard LM2931 variants? A: NCV2931AD-5.0R2G is automotive-qualified (AEC-Q100) with extended temperature range (-40°C to 125°C) and superior PSRR (90dB). Use this part for automotive or high-reliability applications requiring formal qualification.

Q: Does voltage dropout affect circuit design? A: The original LM2931AMX-5.0 specifies 0.3V dropout at 100mA. Cross-manufacturer alternatives specify 0.6V dropout. For input voltages above 5.6V, both are acceptable. For lower input voltages, verify the original 0.3V dropout specification is required before substituting with higher-dropout alternatives.

Q: Can I use LM2931AD50R (STMicroelectronics) in place of Texas Instruments parts? A: Yes. LM2931AD50R meets all functional requirements with 8-SOIC packaging, 5V output, 100mA current, and active product status. It offers 75dB PSRR and extended temperature range. Verify PCB layout compatibility with your design before substitution.

Q: What packaging formats are available? A: Substitutes are available in Cut Tape (CT) & Digi-Reel, Tube, and Tape & Reel (TR) formats. All maintain the same 8-SOIC (0.154", 3.90mm Width) footprint. Select packaging based on assembly process requirements and volume.