LM4128AMF-3.0 Equivalent & Substitute Parts

Part Overview

The LM4128AMF-3.0 is a Series Voltage Reference IC manufactured by Texas Instruments, designed to provide a fixed 3V output with ±0.1% tolerance in a SOT-23-5 surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The LM4128AMF-3.0 operates across an input voltage range of 3.4V to 5.5V with a maximum output current of 20 mA and is suitable for precision voltage reference applications requiring low noise and stable temperature performance.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3V	V
Output Current	20 mA	mA
Voltage Tolerance	±0.1%	%
Temperature Coefficient	75 ppm/°C	ppm/°C
Noise (0.1Hz to 10Hz)	285 µVp-p	µVp-p
Input Voltage Range	3.4V ~ 5.5V	V
Supply Current	100 µA	µA
Operating Temperature	-40°C ~ 125°C	°C
Package Type	SOT-23-5 (SC-74A, SOT-753)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the LM4128AMF-3.0 is determined by electrical and mechanical parameter compatibility within the Power Management (PMIC) category. The critical parameters that define substitutability are:

Electrical Parameters:

Fixed output voltage of 3V
Output current capability of 20 mA or greater
Voltage tolerance of ±0.1% or tighter
Input voltage range encompassing 3.4V to 5.5V
Operating temperature range of -40°C to 125°C

Mechanical Parameters:

SOT-23-5 package configuration
Surface mount mounting type

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents (Texas Instruments LM4128 Series) Parts LM4128AMF-3.0/NOPB, LM4128AMFX-3.0/NOPB, LM4128AQ1MF3.0/NOPB, and LM4128AQ1MFX3.0/NOPB maintain identical electrical specifications with the main part. These parts differ in packaging format (Tape & Reel versus Bulk) and product status (Active versus Obsolete). The automotive-qualified variants (LM4128AQ1MF3.0/NOPB and LM4128AQ1MFX3.0/NOPB) include AEC-Q100 certification and are suitable for applications requiring automotive-grade components.

Category 2: Functional Equivalent (Analog Devices MAX6037AAUK30+T) The MAX6037AAUK30+T provides the same fixed 3V output and SOT-23-5 package but operates with different electrical characteristics. This part exhibits tighter temperature coefficient (25 ppm/°C versus 75 ppm/°C), lower noise performance, and reduced output current capability (5 mA versus 20 mA). The MAX6037AAUK30+T is suitable for applications where lower output current requirements and superior temperature stability are acceptable trade-offs.

Parameter Comparison

Parameter	LM4128AMF-3.0	LM4128AMF-3.0/NOPB	LM4128AMFX-3.0/NOPB	LM4128AQ1MF3.0/NOPB	LM4128AQ1MFX3.0/NOPB	MAX6037AAUK30+T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated
Output Voltage	3V	3V	3V	3V	3V	3V
Output Current	20 mA	20 mA	20 mA	20 mA	20 mA	5 mA
Voltage 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)	285 µVp-p	285 µVp-p	285 µVp-p	285 µVp-p	285 µVp-p	17 µVp-p
Input Voltage Range	3.4V ~ 5.5V	3.4V ~ 5.5V	3.4V ~ 5.5V	3.4V ~ 5.5V	3.4V ~ 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	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Type	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	Not specified	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	No	Yes (AEC-Q100)	Yes (AEC-Q100)	No

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select LM4128AMF-3.0/NOPB or LM4128AMFX-3.0/NOPB for applications requiring exact electrical parameter matching with the obsolete LM4128AMF-3.0. Both parts are active products with ROHS3 compliance. LM4128AMF-3.0/NOPB is available in Tape & Reel packaging with 4705 units in stock. LM4128AMFX-3.0/NOPB is also Tape & Reel packaged with 750 units in stock. These parts maintain the 20 mA output current capability, ±0.1% tolerance, and 75 ppm/°C temperature coefficient.

For Automotive Applications:

Select LM4128AQ1MFX3.0/NOPB for designs requiring automotive-grade voltage reference components. This part carries AEC-Q100 qualification, ROHS3 compliance, and Tape & Reel packaging with 1070 units in stock. Electrical specifications are identical to the standard LM4128 variants. Alternatively, LM4128AQ1MF3.0/NOPB provides the same automotive qualification in Bulk packaging with 13306 units in stock.

For Applications with Lower Output Current Requirements:

Select MAX6037AAUK30+T when output current demand does not exceed 5 mA. This part offers superior temperature stability (25 ppm/°C), significantly lower noise performance (17 µVp-p), and extended input voltage range (2.5V to 5.5V). The trade-off is reduced output current capability and slightly relaxed voltage tolerance (±0.2%). This part is ROHS3 compliant and available in Cut Tape & Digi-Reel packaging with 1270 units in stock.

Frequently Asked Questions (FAQ)

Q: Can LM4128AMF-3.0/NOPB be used as a direct replacement for the obsolete LM4128AMF-3.0?

A: Yes. LM4128AMF-3.0/NOPB is a direct parametric equivalent with identical electrical specifications. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant). Both parts operate at 3V output, 20 mA maximum current, ±0.1% tolerance, and 75 ppm/°C temperature coefficient in SOT-23-5 packaging.

Q: What is the difference between LM4128AMF-3.0/NOPB and LM4128AMFX-3.0/NOPB?

A: Both parts are electrically identical with the same specifications. The difference lies in packaging format and inventory levels. LM4128AMF-3.0/NOPB is available in Tape & Reel with 4705 units in stock. LM4128AMFX-3.0/NOPB is also Tape & Reel packaged with 750 units in stock. Selection between these parts should be based on procurement quantity and delivery requirements.

Q: When should the automotive-qualified LM4128AQ1MFX3.0/NOPB be selected?

A: Select LM4128AQ1MFX3.0/NOPB for designs requiring automotive-grade components. This part carries AEC-Q100 qualification and is suitable for automotive applications. Electrical specifications are identical to standard LM4128 variants. This part is available in Tape & Reel packaging with 1070 units in stock.

Q: Is MAX6037AAUK30+T a suitable replacement for applications requiring 20 mA output current?

A: No. MAX6037AAUK30+T is limited to 5 mA maximum output current, making it unsuitable for applications requiring the full 20 mA capability of the LM4128AMF-3.0. This part is appropriate only for low-current reference applications where the reduced output current is acceptable.

Q: What are the advantages of MAX6037AAUK30+T compared to LM4128 variants?

A: MAX6037AAUK30+T offers superior temperature stability (25 ppm/°C versus 75 ppm/°C), significantly lower noise (17 µVp-p versus 285 µVp-p), and extended input voltage range (2.5V to 5.5V versus 3.4V to 5.5V). These advantages are offset by reduced output current capability (5 mA versus 20 mA) and slightly relaxed voltage tolerance (±0.2% versus ±0.1%).

Q: Are all substitute parts available in SOT-23-5 packaging?

A: Yes. All substitute parts listed are available in SOT-23-5 (SC-74A, SOT-753) surface mount packaging, ensuring mechanical compatibility with the original LM4128AMF-3.0 design.

Q: What is the difference between Tape & Reel and Bulk packaging options?

A: Tape & Reel packaging is suitable for automated assembly processes and high-volume production. Bulk packaging is typically used for lower-volume applications or manual assembly. Electrical specifications are identical between packaging formats. Selection depends on manufacturing process requirements and order quantities.

Q: Are all substitute parts RoHS compliant?

A: LM4128AMF-3.0/NOPB, LM4128AMFX-3.0/NOPB, LM4128AQ1MFX3.0/NOPB, and MAX6037AAUK30+T are all ROHS3 compliant. LM4128AQ1MF3.0/NOPB RoHS status is not specified in the provided data. The original LM4128AMF-3.0 is RoHS non-compliant.

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