LM4128DMFX-3.0 Equivalent & Substitute Parts

Part Overview

The LM4128DMFX-3.0 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 3V output with ±1% tolerance in a SOT-23-5 surface mount package. This part is classified as Obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. The LM4128 series provides precision voltage reference functionality suitable for power management applications requiring stable reference voltages across industrial temperature ranges.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	3V
Output Current	20 mA
Tolerance	±1%
Temperature Coefficient	100 ppm/°C
Input Voltage Range	3.4V ~ 5.5V
Supply Current	100 µA
Operating Temperature	-40°C ~ 125°C (TJ)
Package	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM4128DMFX-3.0 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Fixed output voltage of 3V
Output current capability of 20 mA minimum
Tolerance of ±1% or better
Input voltage range of 3.4V ~ 5.5V or wider
Operating temperature range of -40°C ~ 125°C or wider
Package type: SOT-23-5 (SC-74A, SOT-753)

Substitute Categories:

Direct Manufacturer Equivalents (Texas Instruments LM4128 Series): Parts with identical electrical specifications and active product status, differing only in packaging format (Tape & Reel vs. bulk).
Parametric Equivalents (Texas Instruments LM4128 Series): Parts meeting all electrical parameters with active status, including automotive-qualified variants (AEC-Q100).
Cross-Manufacturer Equivalent (Analog Devices/Maxim Integrated MAX6037AAUK30+T): Alternative manufacturer part meeting or exceeding all electrical specifications with superior performance characteristics (lower tolerance, lower temperature coefficient, lower noise).

Parameter Comparison

Parameter	LM4128DMFX-3.0	LM4128DMFX-3.0/NOPB	LM4128DMF-3.0/NOPB	LM4128DQ1MF3.0/NOPB	LM4128DQ1MFX3.0/NOPB	MAX6037AAUK30+T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices/Maxim
Output Voltage	3V	3V	3V	3V	3V	3V
Output Current	20 mA	20 mA	20 mA	20 mA	20 mA	5 mA
Tolerance	±1%	±1%	±1%	±1%	±1%	±0.2%
Temperature Coefficient	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	25 ppm/°C
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	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 (Same Manufacturer, Active Status):

Select LM4128DMFX-3.0/NOPB, LM4128DMF-3.0/NOPB, or LM4128DQ1MFX3.0/NOPB. These parts maintain identical electrical specifications to the obsolete LM4128DMFX-3.0 while offering active product status and ROHS3 compliance. The primary distinction is packaging format: Tape & Reel (TR) for automated assembly or Bulk for manual handling. The LM4128DQ1MFX3.0/NOPB variant includes automotive qualification (AEC-Q100) for applications requiring automotive-grade components.

For Automotive Applications:

LM4128DQ1MF3.0/NOPB or LM4128DQ1MFX3.0/NOPB are specified for designs requiring AEC-Q100 qualification. Both maintain the 20 mA output current and ±1% tolerance of the original part while providing automotive-grade reliability.

For Enhanced Performance Requirements:

MAX6037AAUK30+T from Analog Devices/Maxim Integrated offers superior electrical characteristics: ±0.2% tolerance (5× tighter than LM4128 series), 25 ppm/°C temperature coefficient (4× lower drift), and extended input voltage range (2.5V minimum vs. 3.4V). This part is suitable for applications requiring higher precision voltage reference performance. Note that output current is limited to 5 mA; applications requiring 20 mA output current must use LM4128 series parts.

Compliance Considerations:

All active substitute parts are ROHS3 compliant. The original LM4128DMFX-3.0 is RoHS non-compliant; migration to active equivalents ensures regulatory compliance for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can LM4128DMFX-3.0 be directly replaced with LM4128DMFX-3.0/NOPB?

A: Yes. Both parts are electrically identical with matching output voltage (3V), output current (20 mA), tolerance (±1%), and temperature range (-40°C ~ 125°C). The primary difference is packaging: the original uses standard packaging while the /NOPB variant is supplied in Tape & Reel format. Pinout and electrical performance are identical.

Q: What is the difference between LM4128DMF-3.0/NOPB and LM4128DQ1MFX3.0/NOPB?

A: Both parts share identical electrical specifications (3V output, 20 mA, ±1% tolerance, 100 ppm/°C). The LM4128DQ1MFX3.0/NOPB includes automotive qualification (AEC-Q100) and is supplied in Tape & Reel format, while LM4128DMF-3.0/NOPB is the industrial-grade equivalent in Tape & Reel packaging. Select the automotive variant for applications requiring AEC-Q100 compliance.

Q: Can MAX6037AAUK30+T replace LM4128DMFX-3.0 in all applications?

A: MAX6037AAUK30+T is electrically compatible for voltage reference functionality but has a reduced output current specification of 5 mA versus 20 mA for the LM4128 series. Applications requiring output currents exceeding 5 mA must use LM4128 series parts. For applications within the 5 mA limit, MAX6037AAUK30+T offers superior performance with ±0.2% tolerance and 25 ppm/°C temperature coefficient.

Q: What packaging options are available for LM4128 substitutes?

A: LM4128DMFX-3.0/NOPB, LM4128DMF-3.0/NOPB, and LM4128DQ1MFX3.0/NOPB are supplied in Tape & Reel (TR) format for automated assembly. LM4128DQ1MF3.0/NOPB is available in Bulk packaging. All parts use SOT-23-5 (SC-74A, SOT-753) package with identical pinout and footprint.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts (LM4128DMFX-3.0/NOPB, LM4128DMF-3.0/NOPB, LM4128DQ1MFX3.0/NOPB, and MAX6037AAUK30+T) are ROHS3 compliant. The original LM4128DMFX-3.0 is RoHS non-compliant. Migration to active equivalents ensures compliance with current environmental regulations.

Q: Which substitute part has the lowest temperature coefficient?

A: MAX6037AAUK30+T has a temperature coefficient of 25 ppm/°C, compared to 100 ppm/°C for all LM4128 series parts. This 4× improvement in temperature stability is beneficial for precision applications where output voltage drift over temperature must be minimized.

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