LM4128AMF-2.0 Equivalent & Substitute Parts

Part Overview

The LM4128AMF-2.0 is a Series Voltage Reference IC manufactured by Texas Instruments, delivering a fixed 2.048V output with ±0.1% tolerance in a SOT-23-5 surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a -40°C to 125°C temperature range with 20 mA output current capability and is suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.048V
Output Current	20 mA
Tolerance	±0.1%
Temperature Coefficient	75 ppm/°C
Noise (0.1Hz to 10Hz)	190 µVp-p
Input Voltage Range	2.448V ~ 5.5V
Supply Current	100 µA
Operating Temperature	-40°C ~ 125°C
Package	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM4128AMF-2.0 are classified into two categories based on electrical and mechanical compatibility:

Direct Manufacturer Equivalents (Texas Instruments LM4128 Series): These parts maintain identical electrical specifications and package configuration. Substitution is based on matching output voltage (2.048V), tolerance (±0.1%), output current (20 mA), temperature coefficient (75 ppm/°C), input voltage range (2.448V ~ 5.5V), and SOT-23-5 packaging. Parts in this group differ only in product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard).

Parametric Equivalent (Analog Devices MAX6037AAUK21+T): This part provides the same fixed 2.048V output voltage and SOT-23-5 package but with relaxed tolerance (±0.2% vs. ±0.1%), reduced output current (5 mA vs. 20 mA), improved temperature coefficient (25 ppm/°C vs. 75 ppm/°C), and lower supply current (275 µA vs. 100 µA). Selection requires application-level current demand assessment.

Parameter Comparison

Parameter	LM4128AMF-2.0	LM4128AMF-2.0/NOPB	LM4128AMFX-2.0/NOPB	LM4128AQ1MF2.0/NOPB	LM4128AQ1MFX2.0/NOPB	MAX6037AAUK21+T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated
Output Voltage	2.048V	2.048V	2.048V	2.048V	2.048V	2.048V
Output Current	20 mA	20 mA	20 mA	20 mA	20 mA	5 mA
Tolerance	±0.1%	±0.1%	±0.1%	±0.1%	±0.1%	±0.2%
Temperature Coefficient	75 ppm/°C	75 ppm/°C	75 ppm/°C	75 ppm/°C	75 ppm/°C	25 ppm/°C
Noise (0.1Hz to 10Hz)	190 µVp-p	190 µVp-p	190 µVp-p	190 µVp-p	190 µVp-p	11 µVp-p
Input Voltage Range	2.448V ~ 5.5V	2.448V ~ 5.5V	2.448V ~ 5.5V	2.448V ~ 5.5V	2.448V ~ 5.5V	2.5V ~ 5.5V
Supply Current	100 µA	100 µA	100 µA	100 µA	100 µA	275 µA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Commercial	Commercial	Commercial	Automotive (AEC-Q100)	Automotive (AEC-Q100)	Commercial

Engineering Selection Recommendations

For Direct Replacement (LM4128 Series): Select LM4128AMF-2.0/NOPB, LM4128AMFX-2.0/NOPB, LM4128AQ1MF2.0/NOPB, or LM4128AQ1MFX2.0/NOPB when full electrical parameter matching is required. All four parts are Active status and ROHS3 compliant, addressing the obsolescence of the original LM4128AMF-2.0. The automotive-grade variants (LM4128AQ1MF2.0/NOPB and LM4128AQ1MFX2.0/NOPB) carry AEC-Q100 qualification for applications requiring automotive reliability standards.

For Cross-Manufacturer Substitution (MAX6037AAUK21+T): The Analog Devices MAX6037AAUK21+T provides identical 2.048V output and SOT-23-5 packaging with Active product status and ROHS3 compliance. This part is suitable only when application requirements accommodate reduced output current (5 mA maximum vs. 20 mA), relaxed tolerance (±0.2% vs. ±0.1%), and increased supply current (275 µA vs. 100 µA). The superior temperature coefficient (25 ppm/°C) and lower noise floor (11 µVp-p) may benefit precision applications with lower current demands.

Frequently Asked Questions (FAQ)

Q: Can LM4128AQ1MF2.0/NOPB replace LM4128AMF-2.0 in non-automotive applications? A: Yes. The LM4128AQ1MF2.0/NOPB maintains identical electrical specifications (2.048V output, ±0.1% tolerance, 20 mA output current, 75 ppm/°C temperature coefficient) and SOT-23-5 packaging. Automotive qualification does not restrict use in commercial applications.

Q: What is the key limitation of MAX6037AAUK21+T as a substitute? A: The MAX6037AAUK21+T is limited to 5 mA maximum output current, compared to 20 mA for the LM4128 series. Applications requiring higher output current must use LM4128 equivalents. Additionally, tolerance is ±0.2% versus ±0.1%, which may impact precision-critical circuits.

Q: Are all substitute parts available in Tape & Reel packaging? A: Yes. All listed substitute parts are supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Q: Does the original LM4128AMF-2.0 have RoHS compliance? A: No. The original LM4128AMF-2.0 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current environmental regulations.

Q: Which substitute part is recommended for automotive applications? A: LM4128AQ1MF2.0/NOPB and LM4128AQ1MFX2.0/NOPB are automotive-grade variants with AEC-Q100 qualification. These parts maintain full electrical equivalence to the original while meeting automotive reliability standards.

Q: Can I use MAX6037AAUK21+T in a circuit designed for LM4128AMF-2.0? A: Substitution is possible only if the circuit design accommodates the parameter differences: maximum 5 mA output current, ±0.2% tolerance, and 275 µA supply current. Circuits requiring 20 mA output current or ±0.1% tolerance must use LM4128 equivalents.

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