LM4128AMFX-2.0/NOPB Equivalent & Substitute Parts

Part Overview

The LM4128AMFX-2.0/NOPB is a Series Voltage Reference IC manufactured by Texas Instruments, designed to provide a fixed 2.048V output with ±0.1% tolerance. This component operates as a precision voltage reference in power management applications, with an active product status and full RoHS3 compliance. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory availability, or specific performance trade-offs within the defined electrical and mechanical parameters.

Substiute Parts

LM4128AMFX-2.0/NOPB

Texas InstrumentsIn Stock: 1091LM4128AMFX-2.0/NOPB Datasheet

Current PartRFQ

LM4128AMF-2.0/NOPB

Texas InstrumentsIn Stock: 2103LM4128AMF-2.0/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 LM4128AMFX-2.0/NOPB are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Fixed output voltage of 2.048V
• Series voltage reference topology
• SOT-23-5 package (SC-74A, SOT-753)
• Surface mount configuration
• Operating temperature range of -40°C to 125°C
• RoHS3 compliance and MSL 1 rating

Acceptable Parameter Variations: Substitute parts may differ in tolerance, temperature coefficient, noise specifications, output current capability, and supply current, provided the core voltage reference function and package compatibility remain unchanged. These variations are acceptable when design margins accommodate the differences or when specific performance trade-offs are intentional.

Parameter Comparison

Engineering Selection Recommendations

LM4128AMF-2.0/NOPB (Parametric Equivalent): This part is a direct parametric equivalent to the LM4128AMFX-2.0/NOPB, sharing identical electrical specifications and package configuration. Both are manufactured by Texas Instruments with active product status and full RoHS3 compliance. Selection between these two variants is determined by packaging format requirements (Tape & Reel availability) and inventory considerations.

MAX6037AAUK21+T (Manufacturer-Recommended Alternative): This part provides the same 2.048V fixed output voltage and SOT-23-5 package compatibility. The MAX6037AAUK21+T exhibits superior performance characteristics in temperature coefficient (25ppm/°C versus 75ppm/°C) and noise performance (11µVp-p versus 190µVp-p in the 0.1Hz to 10Hz band). However, it operates at reduced output current (5 mA versus 20 mA) and increased supply current (275µA versus 100µA). The tolerance specification is ±0.2% compared to ±0.1%. Selection of this alternative is appropriate when lower noise and improved temperature stability are design priorities and output current requirements do not exceed 5 mA. Both parts maintain active product status, RoHS3 compliance, and MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can LM4128AMF-2.0/NOPB be used as a direct replacement for LM4128AMFX-2.0/NOPB?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, including 2.048V output, ±0.1% tolerance, 75ppm/°C temperature coefficient, and 20 mA output current. The difference lies in packaging format. Both are housed in SOT-23-5 packages and maintain the same operating temperature range and compliance certifications.

Q: What are the key differences between LM4128AMFX-2.0/NOPB and MAX6037AAUK21+T?

A: The primary differences are output current capability (20 mA versus 5 mA), tolerance (±0.1% versus ±0.2%), temperature coefficient (75ppm/°C versus 25ppm/°C), and noise performance (190µVp-p versus 11µVp-p at 0.1Hz to 10Hz). Supply current is also higher in the MAX6037 (275µA versus 100µA). Both maintain 2.048V output voltage and SOT-23-5 package compatibility.

Q: Is the MAX6037AAUK21+T suitable for applications requiring 20 mA output current?

A: No. The MAX6037AAUK21+T is rated for 5 mA maximum output current, making it unsuitable for applications requiring the full 20 mA capability of the LM4128AMFX-2.0/NOPB. Selection of this alternative requires verification that load current does not exceed 5 mA.

Q: Are all three parts RoHS3 compliant?

A: Yes. LM4128AMFX-2.0/NOPB, LM4128AMF-2.0/NOPB, and MAX6037AAUK21+T are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What is the temperature measurement reference for each part?

A: LM4128AMFX-2.0/NOPB and LM4128AMF-2.0/NOPB specify operating temperature as -40°C to 125°C (TJ), where TJ represents junction temperature. MAX6037AAUK21+T specifies -40°C to 125°C (TA), where TA represents ambient temperature. Both temperature ranges are equivalent for practical application design.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, provided the PCB footprint accommodates the SOT-23-5 package. All three parts use identical package geometry (SC-74A, SOT-753). Electrical substitution requires verification that design margins accommodate any parameter differences, particularly output current capability and tolerance specifications.