LM4128DMFX-2.0 Equivalent & Substitute Parts

Part Overview

The LM4128DMFX-2.0 is a series voltage reference IC from Texas Instruments, delivering a fixed 2.048V output with ±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 component operates across a -40°C to 125°C temperature range with 100µA supply current and supports input voltages from 2.448V to 5.5V.

Substiute Parts

LM4128DMFX-2.0

Texas InstrumentsIn Stock: 3060LM4128DMFX-2.0 Datasheet

Current PartRFQ

LM4128DMFX-2.0/NOPB

Texas InstrumentsIn Stock: 904LM4128DMFX-2.0/NOPB Datasheet

DirectRFQ

LM4128DMF-2.0/NOPB

Texas InstrumentsIn Stock: 3081LM4128DMF-2.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4128DQ1MF2.0/NOPB

National SemiconductorIn Stock: 16520LM4128DQ1MF2.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4128DQ1MFX2.0/NOPB

Texas InstrumentsIn Stock: 1137LM4128DQ1MFX2.0/NOPB Datasheet

Parametric EquivalentRFQ

MAX6037AAUK21+T

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM4128DMFX-2.0 are classified based on electrical and mechanical compatibility within the following criteria:

Direct Manufacturer Substitutes maintain identical electrical specifications: 2.048V fixed output, ±1% tolerance, 20 mA output current, 100ppm/°C temperature coefficient, SOT-23-5 package, and -40°C to 125°C operating range. These parts differ only in product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard).

Parametric Equivalents provide the same core voltage reference output and package form factor but may include automotive-grade qualifications (AEC-Q100) or alternative manufacturer sourcing. Electrical performance remains identical across the specified parameters.

Manufacturer Recommended Alternatives offer superior performance characteristics while maintaining the same 2.048V output voltage and SOT-23-5 package. These parts feature tighter tolerance (±0.2% vs. ±1%), lower temperature coefficient (25ppm/°C vs. 100ppm/°C), and reduced noise specifications, making them suitable for applications requiring enhanced precision.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement in Active Production: LM4128DMFX-2.0/NOPB or LM4128DMF-2.0/NOPB are the primary choices. Both maintain identical electrical specifications and SOT-23-5 packaging. LM4128DMFX-2.0/NOPB is available in Tape & Reel format, while LM4128DMF-2.0/NOPB offers higher inventory availability (3065 pcs). Both are ROHS3 compliant, addressing the RoHS non-compliance of the obsolete original part.

For Automotive Applications: LM4128DQ1MF2.0/NOPB and LM4128DQ1MFX2.0/NOPB are qualified to AEC-Q100 automotive standards. These parts maintain identical electrical performance while providing automotive-grade reliability. LM4128DQ1MFX2.0/NOPB includes ROHS3 compliance and Tape & Reel packaging.

For Enhanced Precision Requirements: MAX6037AAUK21+T from Analog Devices Inc./Maxim Integrated offers superior performance with ±0.2% tolerance (vs. ±1%), 25ppm/°C temperature coefficient (vs. 100ppm/°C), and significantly reduced noise (11µVp-p vs. 190µVp-p). This part is suitable for applications requiring tighter voltage reference accuracy. Note that output current is reduced to 5 mA and supply current increases to 275µA.

Frequently Asked Questions (FAQ)

Q: Can LM4128DMFX-2.0/NOPB directly replace the obsolete LM4128DMFX-2.0?

A: Yes. Both parts are electrically identical with matching 2.048V output, ±1% tolerance, 20 mA output current, and SOT-23-5 package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Pin-for-pin compatibility is maintained.

Q: What is the difference between LM4128DMF-2.0/NOPB and LM4128DMFX-2.0/NOPB?

A: Both parts are electrically and functionally identical. The difference lies in packaging format: LM4128DMFX-2.0/NOPB is supplied in Tape & Reel (TR) format, while LM4128DMF-2.0/NOPB is supplied in Tape & Reel as well. Inventory availability differs, with LM4128DMF-2.0/NOPB having 3065 pcs in stock versus 812 pcs for the DMFX variant.

Q: Are automotive-qualified versions available?

A: Yes. LM4128DQ1MF2.0/NOPB and LM4128DQ1MFX2.0/NOPB are both AEC-Q100 qualified automotive-grade parts with identical electrical specifications. LM4128DQ1MFX2.0/NOPB includes ROHS3 compliance and Tape & Reel packaging.

Q: Can MAX6037AAUK21+T be used as a direct substitute?

A: MAX6037AAUK21+T is not a direct substitute due to differences in output current (5 mA vs. 20 mA) and supply current (275µA vs. 100µA). However, it is a functional alternative for applications where the lower output current is acceptable and enhanced precision (±0.2% tolerance, 25ppm/°C temperature coefficient) is beneficial. Circuit redesign may be required to accommodate the reduced output current capability.

Q: What are the key parameters that determine substitutability?

A: The critical parameters for substitution are: fixed output voltage (2.048V), output type (fixed), package form factor (SOT-23-5), mounting type (surface mount), and operating temperature range (-40°C to 125°C). Parts matching these parameters are considered equivalent. Secondary considerations include tolerance, temperature coefficient, and noise specifications, which may vary in enhanced-performance alternatives.

Q: Is the SOT-23-5 package compatible across all listed substitutes?

A: Yes. All listed substitute parts use the SC-74A, SOT-753 package designation with SOT-23-5 supplier device package, ensuring mechanical and electrical compatibility on the PCB.