LM4128AMFX-3.0 Equivalent & Substitute Parts

Part Overview

The LM4128AMFX-3.0 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 3V output with ±0.1% tolerance and 20 mA output current in a SOT-23-5 surface mount package. This part is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM4128AMFX-3.0 serves as a precision voltage reference in power management applications requiring stable, low-noise reference signals.

Substiute Parts

LM4128AMFX-3.0

Texas InstrumentsIn Stock: 2997LM4128AMFX-3.0 Datasheet

Current PartRFQ

LM4128AMFX-3.0/NOPB

Texas InstrumentsIn Stock: 786LM4128AMFX-3.0/NOPB Datasheet

DirectRFQ

LM4128AMF-3.0/NOPB

Texas InstrumentsIn Stock: 4764LM4128AMF-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4128AQ1MF3.0/NOPB

Texas InstrumentsIn Stock: 13355LM4128AQ1MF3.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4128AQ1MFX3.0/NOPB

Texas InstrumentsIn Stock: 1122LM4128AQ1MFX3.0/NOPB Datasheet

Parametric EquivalentRFQ

MAX6037AAUK30+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1299MAX6037AAUK30+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM4128AMFX-3.0 are categorized based on electrical and mechanical parameter alignment:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging, differing only in product status and compliance certifications. These parts are sourced from the same manufacturer (Texas Instruments) and are pin-compatible replacements.

Parametric Equivalents share the same core electrical characteristics (3V fixed output, ±0.1% tolerance, 20 mA output current, SOT-23-5 package) but may include automotive-grade qualifications or different packaging formats. These parts satisfy the same functional requirements in equivalent applications.

Manufacturer Recommended Alternatives are cross-manufacturer substitutes that meet the functional voltage reference requirements but with different electrical specifications. These parts are suitable when the application tolerates variations in output current, tolerance, temperature coefficient, or noise performance.

Key parameters determining substitution eligibility:

• Output voltage: 3V fixed
• Output current capability: 20 mA (or higher)
• Tolerance: ±0.1% (or tighter)
• Package: SOT-23-5 (SC-74A, SOT-753)
• Input voltage range: 3.4V ~ 5.5V (or compatible)
• Operating temperature: -40°C ~ 125°C

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement in Commercial Applications: LM4128AMFX-3.0/NOPB or LM4128AMF-3.0/NOPB are the primary choices. Both are Active status parts from Texas Instruments with identical electrical specifications to the obsolete LM4128AMFX-3.0. LM4128AMFX-3.0/NOPB maintains the exact part number suffix, while LM4128AMF-3.0/NOPB offers higher inventory availability (4705 units). Both are ROHS3 compliant, addressing regulatory requirements not met by the original obsolete part.

For Automotive Applications: LM4128AQ1MF3.0/NOPB (Bulk packaging) or LM4128AQ1MFX3.0/NOPB (Tape & Reel) are qualified to AEC-Q100 automotive standards. These parts maintain identical electrical specifications while providing automotive-grade reliability. LM4128AQ1MFX3.0/NOPB is additionally ROHS3 compliant.

For Applications with Relaxed Output Current Requirements: MAX6037AAUK30+T from Analog Devices Inc./Maxim Integrated is suitable when the application requires only 5 mA output current instead of 20 mA. This part offers superior noise performance (17 µVp-p vs. 285 µVp-p), lower temperature coefficient (25 ppm/°C vs. 75 ppm/°C), and wider input voltage range (2.5V ~ 5.5V). However, tolerance is ±0.2% versus ±0.1%, and supply current is higher (275 µA vs. 100 µA).

Frequently Asked Questions (FAQ)

Q: Can I use LM4128AMF-3.0/NOPB as a direct replacement for LM4128AMFX-3.0? A: Yes. Both parts share identical electrical specifications (3V output, ±0.1% tolerance, 20 mA output current, 75 ppm/°C temperature coefficient) and the same SOT-23-5 package. The primary difference is packaging format (Tape & Reel vs. Bulk) and product status (Active vs. Obsolete). LM4128AMF-3.0/NOPB is ROHS3 compliant, addressing compliance gaps in the obsolete part.

Q: What is the difference between the commercial-grade and automotive-grade LM4128 variants? A: The automotive-grade variants (LM4128AQ1MF3.0/NOPB and LM4128AQ1MFX3.0/NOPB) are qualified to AEC-Q100 standards, ensuring reliability in automotive temperature and stress environments. Electrically, they are identical to commercial-grade parts. Selection depends on application requirements and end-use environment.

Q: Can MAX6037AAUK30+T replace the LM4128AMFX-3.0 in all applications? A: MAX6037AAUK30+T is functionally compatible only in applications where output current does not exceed 5 mA. The part offers superior noise and temperature stability but has ±0.2% tolerance versus ±0.1%, and higher supply current (275 µA vs. 100 µA). Applications requiring 20 mA output current must use LM4128 variants.

Q: What packaging options are available for LM4128 substitutes? A: LM4128AMFX-3.0/NOPB and LM4128AQ1MFX3.0/NOPB are supplied in Tape & Reel format, suitable for automated assembly. LM4128AMF-3.0/NOPB and LM4128AQ1MF3.0/NOPB are supplied in Bulk format. MAX6037AAUK30+T is available in Cut Tape and Digi-Reel format. Selection depends on production volume and assembly equipment compatibility.

Q: Are all substitute parts RoHS compliant? A: LM4128AMFX-3.0/NOPB, LM4128AMF-3.0/NOPB, LM4128AQ1MFX3.0/NOPB, and MAX6037AAUK30+T are ROHS3 compliant. LM4128AQ1MF3.0/NOPB RoHS status is not specified. The original LM4128AMFX-3.0 is RoHS non-compliant.

Q: What is the temperature coefficient difference between LM4128 and MAX6037 parts? A: LM4128 variants have a temperature coefficient of 75 ppm/°C, while MAX6037AAUK30+T has 25 ppm/°C. Lower temperature coefficient indicates better output voltage stability across temperature variations. MAX6037 is superior for applications requiring minimal voltage drift over temperature.