LM4128AMFX-2.0 Equivalent & Substitute Parts

Part Overview

The LM4128AMFX-2.0 is a series voltage reference IC from Texas Instruments, delivering a fixed 2.048V output with ±0.1% tolerance 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-2.0 operates across a 2.448V to 5.5V input range with 20 mA output current capability and is suitable for precision analog applications requiring stable voltage references.

Substiute Parts

LM4128AMFX-2.0

Texas InstrumentsIn Stock: 3255LM4128AMFX-2.0 Datasheet

Current PartRFQ

LM4128AMFX-2.0/NOPB

Texas InstrumentsIn Stock: 1091LM4128AMFX-2.0/NOPB Datasheet

DirectRFQ

LM4128AMF-2.0/NOPB

Texas InstrumentsIn Stock: 2103LM4128AMF-2.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4128AQ1MF2.0/NOPB

Texas InstrumentsIn Stock: 3099LM4128AQ1MF2.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4128AQ1MFX2.0/NOPB

Texas InstrumentsIn Stock: 767LM4128AQ1MFX2.0/NOPB Datasheet

Parametric EquivalentRFQ

MAX6037AAUK21+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3426MAX6037AAUK21+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM4128AMFX-2.0 is determined by the following critical parameters:

• Fixed output voltage of 2.048V
• Output current capability of 20 mA minimum
• Tolerance of ±0.1% or better
• Input voltage range compatibility (2.448V ~ 5.5V minimum)
• SOT-23-5 package format
• Surface mount technology

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents (Texas Instruments LM4128 Series): Parts with identical electrical specifications and active product status, differing only in packaging format (Tape & Reel) or qualification level.

Parametric Equivalents (Texas Instruments LM4128AQ1 Automotive Grade): Parts meeting all electrical specifications with additional automotive qualification (AEC-Q100) and active product status.

MFR Recommended Alternative (Analog Devices MAX6037AAUK21+T): Cross-manufacturer substitute with the same fixed output voltage and package, meeting core functional requirements while offering different performance characteristics in secondary parameters.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Active Product Status Required): LM4128AMFX-2.0/NOPB and LM4128AMF-2.0/NOPB are the primary substitutes, offering identical electrical specifications with active product status and ROHS3 compliance. These parts are recommended for new designs and production transitions from the obsolete LM4128AMFX-2.0.

For Automotive Applications: LM4128AQ1MF2.0/NOPB and LM4128AQ1MFX2.0/NOPB provide AEC-Q100 qualification in addition to active product status and ROHS3 compliance. These variants are suitable for automotive-grade applications requiring enhanced reliability documentation.

For Cross-Manufacturer Sourcing: MAX6037AAUK21+T from Analog Devices Inc./Maxim Integrated offers the same 2.048V fixed output and SOT-23-5 package with active product status and ROHS3 compliance. This part exhibits superior noise performance (11 µVp-p vs. 190 µVp-p) and lower temperature coefficient (25 ppm/°C vs. 75 ppm/°C), but delivers reduced output current (5 mA vs. 20 mA) and higher supply current (275 µA vs. 100 µA). Selection of this alternative depends on application requirements for output current capability.

Frequently Asked Questions (FAQ)

Q: Can LM4128AMFX-2.0/NOPB directly replace the obsolete LM4128AMFX-2.0? A: Yes. Both parts share identical electrical specifications, output voltage, tolerance, temperature coefficient, and SOT-23-5 package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The /NOPB suffix indicates lead-free packaging.

Q: What is the difference between LM4128AMF-2.0/NOPB and LM4128AQ1MF2.0/NOPB? A: Both deliver identical electrical performance. LM4128AQ1MF2.0/NOPB includes automotive-grade qualification (AEC-Q100), making it suitable for automotive applications requiring enhanced reliability documentation. LM4128AMF-2.0/NOPB is the standard industrial-grade variant.

Q: Why does MAX6037AAUK21+T have lower output current (5 mA vs. 20 mA)? A: The MAX6037AAUK21+T is designed for lower current applications. Applications requiring 20 mA output current must use the LM4128 series variants. The MAX6037 is suitable only for designs where output current does not exceed 5 mA.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts (LM4128AMFX-2.0/NOPB, LM4128AMF-2.0/NOPB, LM4128AQ1MF2.0/NOPB, LM4128AQ1MFX2.0/NOPB, and MAX6037AAUK21+T) are ROHS3 compliant. The original LM4128AMFX-2.0 is RoHS non-compliant.

Q: Can I use MAX6037AAUK21+T in a design originally specified for LM4128AMFX-2.0? A: Substitution is possible only if the application output current requirement does not exceed 5 mA. The MAX6037 offers superior noise and temperature stability but reduced output current capability and higher supply current consumption. Circuit redesign may be necessary to accommodate these differences.

Q: What is the significance of the /NOPB suffix? A: The /NOPB suffix indicates lead-free (Pb-free) packaging, compliant with RoHS directives. This is standard for active production parts and required for most modern applications.

Q: Are the LM4128AQ1 variants suitable for non-automotive applications? A: Yes. The LM4128AQ1MF2.0/NOPB and LM4128AQ1MFX2.0/NOPB can be used in any application. Automotive qualification is an additional feature that does not restrict use in industrial or consumer applications.