LM4128DMF-2.5 Equivalent & Substitute Parts

Part Overview

The LM4128DMF-2.5 is a Series Voltage Reference IC from Texas Instruments, providing a fixed 2.5V 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 device is designed for applications requiring stable voltage reference generation with low supply current consumption.

Substiute Parts

LM4128DMF-2.5

Texas InstrumentsIn Stock: 1506LM4128DMF-2.5 Datasheet

Current PartRFQ

LM4128DMF-2.5/NOPB

Texas InstrumentsIn Stock: 1680LM4128DMF-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LM4128DQ1MF2.5/NOPB

Texas InstrumentsIn Stock: 2890LM4128DQ1MF2.5/NOPB Datasheet

Parametric EquivalentRFQ

LM4128DQ1MFX2.5/NOPB

Texas InstrumentsIn Stock: 854LM4128DQ1MFX2.5/NOPB Datasheet

Parametric EquivalentRFQ

MAX6037AAUK25+T

Analog Devices Inc./Maxim IntegratedIn Stock: 5028MAX6037AAUK25+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM4128DMF-2.5 is determined by the following critical parameters:

• Fixed output voltage of 2.5V
• SOT-23-5 package compatibility
• Minimum output current capability of 20 mA
• Input voltage range of 2.9V ~ 5.5V
• Operating temperature range of -40°C ~ 125°C
• Surface mount mounting type

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LM4128 Series): Parts that maintain identical electrical specifications and package form factor. These include LM4128DMF-2.5/NOPB, LM4128DQ1MF2.5/NOPB, and LM4128DQ1MFX2.5/NOPB. All three deliver the same 2.5V output, 20 mA current capability, and ±1% tolerance. Differences exist only in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Obsolete), with automotive-qualified variants available.

Manufacturer Recommended Equivalent (Analog Devices/Maxim): The MAX6037AAUK25+T from Analog Devices Inc./Maxim Integrated provides superior performance specifications while maintaining the same 2.5V output and SOT-23-5 package. This part offers enhanced accuracy (±0.2% vs. ±1%), lower temperature coefficient (25 ppm/°C vs. 100 ppm/°C), and significantly reduced noise characteristics.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of the obsolete LM4128DMF-2.5, the LM4128DMF-2.5/NOPB is the primary equivalent. This part maintains identical electrical specifications and package form factor while offering Active product status and ROHS3 compliance. It is available in Cut Tape and Digi-Reel packaging formats.

For applications requiring automotive qualification, both LM4128DQ1MF2.5/NOPB and LM4128DQ1MFX2.5/NOPB are AEC-Q100 qualified alternatives with identical performance specifications. These parts are supplied in Tape & Reel packaging and are suitable for automotive-grade applications.

The MAX6037AAUK25+T from Analog Devices/Maxim Integrated is recommended for designs where enhanced accuracy and lower noise performance provide system-level benefits. This part delivers ±0.2% tolerance versus ±1%, and reduces noise by approximately 95% in the 0.1Hz to 10Hz band. The trade-off is reduced output current capability (5 mA vs. 20 mA) and increased supply current consumption (275 µA vs. 100 µA). This part is suitable only for applications where the 5 mA output current limit is acceptable.

All substitute parts maintain the same 2.5V output voltage, SOT-23-5 package, and -40°C to 125°C operating temperature range, ensuring direct functional compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the LM4128DMF-2.5/NOPB be used as a direct replacement for the obsolete LM4128DMF-2.5?

A: Yes. The LM4128DMF-2.5/NOPB is a parametric equivalent with identical electrical specifications, output voltage, current capability, tolerance, and package form factor. The primary differences are Active product status and ROHS3 compliance. Packaging format differs (Cut Tape vs. standard packaging), but electrical performance is equivalent.

Q: What is the difference between the LM4128DQ1MF2.5/NOPB and LM4128DQ1MFX2.5/NOPB?

A: Both parts are AEC-Q100 automotive-qualified variants of the LM4128 series with identical electrical specifications. The primary difference is the suffix designation (MF vs. MFX), which indicates different manufacturing or qualification batches. Both deliver 2.5V output, 20 mA current, ±1% tolerance, and are supplied in Tape & Reel packaging.

Q: Can the MAX6037AAUK25+T replace the LM4128DMF-2.5 in all applications?

A: The MAX6037AAUK25+T is functionally compatible for applications where output current requirements do not exceed 5 mA. If your circuit requires the full 20 mA output current capability of the LM4128DMF-2.5, the MAX6037AAUK25+T is not suitable. For applications within the 5 mA limit, the MAX6037AAUK25+T offers superior accuracy and noise performance.

Q: Are all substitute parts RoHS compliant?

A: The original LM4128DMF-2.5 is RoHS non-compliant. All active substitute parts (LM4128DMF-2.5/NOPB, LM4128DQ1MF2.5/NOPB, LM4128DQ1MFX2.5/NOPB, and MAX6037AAUK25+T) are ROHS3 compliant, meeting current environmental regulations.

Q: What is the minimum input voltage for each substitute part?

A: The LM4128 series variants require a minimum input voltage of 2.9V. The MAX6037AAUK25+T has a slightly lower minimum input voltage of 2.7V, providing greater flexibility in low-voltage applications.

Q: Are the substitute parts available in the same SOT-23-5 package?

A: Yes. All substitute parts are supplied in the SOT-23-5 package (SC-74A designation), ensuring mechanical and electrical compatibility with existing PCB layouts and socket designs.