LM4128CMF-3.0 Equivalent & Substitute Parts

Part Overview

The LM4128CMF-3.0 is a series voltage reference IC from Texas Instruments, delivering a fixed 3V output with ±0.5% tolerance and 20 mA output current capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across the -40°C to 125°C temperature range in a surface-mount SOT-23-5 package, suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	20 mA
Voltage Tolerance	±0.5%
Temperature Coefficient	100 ppm/°C
Noise (0.1Hz to 10Hz)	285 µVp-p
Input Voltage Range	3.4V ~ 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

Substitution for the LM4128CMF-3.0 is determined by electrical and mechanical compatibility across the following critical parameters:

Fixed output voltage of 3V
Output current capability of 20 mA minimum
Voltage tolerance of ±0.5% or better
Temperature coefficient of 100 ppm/°C or lower
Input voltage range compatibility (3.4V ~ 5.5V minimum)
SOT-23-5 package format
Surface-mount technology

Substitute parts are grouped into two categories: parametric equivalents (matching all electrical specifications) and manufacturer-recommended alternatives (offering superior performance characteristics while maintaining functional compatibility).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Range	Supply Current	Package	Product Status
LM4128CMF-3.0	Texas Instruments	3V	20 mA	±0.5%	100 ppm/°C	3.4V ~ 5.5V	100 µA	SOT-23-5	Obsolete
LM4128CMF-3.0/NOPB	National Semiconductor	3V	20 mA	±0.5%	100 ppm/°C	3.4V ~ 5.5V	100 µA	SOT-23-5	Active
LM4128CMFX-3.0/NOPB	Texas Instruments	3V	20 mA	±0.5%	100 ppm/°C	3.4V ~ 5.5V	100 µA	SOT-23-5	Active
LM4128CQ1MF3.0/NOPB	National Semiconductor	3V	20 mA	±0.5%	100 ppm/°C	3.4V ~ 5.5V	100 µA	SOT-23-5	Active
LM4128CQ1MFX3.0/NOPB	Texas Instruments	3V	20 mA	±0.5%	100 ppm/°C	3.4V ~ 5.5V	100 µA	SOT-23-5	Active
MAX6037AAUK30+T	Analog Devices Inc./Maxim Integrated	3V	5 mA	±0.2%	25 ppm/°C	2.5V ~ 5.5V	275 µA	SOT-23-5	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitution)

LM4128CMF-3.0/NOPB, LM4128CMFX-3.0/NOPB, LM4128CQ1MF3.0/NOPB, and LM4128CQ1MFX3.0/NOPB provide electrical and mechanical equivalence to the obsolete LM4128CMF-3.0. All four parts maintain identical output voltage, current, tolerance, and temperature coefficient specifications. The primary differences are packaging format (Bulk vs. Tape & Reel) and product status (all Active). LM4128CQ1MF3.0/NOPB and LM4128CQ1MFX3.0/NOPB include AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

Manufacturer-Recommended Alternative

MAX6037AAUK30+T from Analog Devices Inc./Maxim Integrated offers superior performance characteristics: ±0.2% tolerance (vs. ±0.5%), 25 ppm/°C temperature coefficient (vs. 100 ppm/°C), and lower noise specifications. However, the output current is limited to 5 mA compared to the 20 mA capability of the LM4128 series. This part is suitable for applications where output current demand does not exceed 5 mA and enhanced precision is required. The wider input voltage range (2.5V ~ 5.5V) provides additional design flexibility.

Frequently Asked Questions (FAQ)

Q: Can LM4128CMF-3.0/NOPB directly replace the obsolete LM4128CMF-3.0?

A: Yes. LM4128CMF-3.0/NOPB is a parametric equivalent with identical electrical specifications and SOT-23-5 package. The primary difference is product status (Active vs. Obsolete) and packaging format (Bulk). Pin configuration and functional behavior are identical.

Q: What is the difference between LM4128CMFX-3.0/NOPB and LM4128CMF-3.0/NOPB?

A: Both parts are parametric equivalents with identical electrical specifications. The "X" designation in LM4128CMFX-3.0/NOPB indicates Tape & Reel packaging, while LM4128CMF-3.0/NOPB is supplied in Bulk format. LM4128CMFX-3.0/NOPB also carries RoHS3 compliance certification.

Q: When should I use LM4128CQ1MF3.0/NOPB or LM4128CQ1MFX3.0/NOPB?

A: These variants include AEC-Q100 automotive qualification. Use them in automotive applications or designs requiring automotive-grade component certification. Electrical specifications remain identical to standard LM4128 variants.

Q: Is MAX6037AAUK30+T a direct replacement?

A: MAX6037AAUK30+T is functionally compatible but not a direct replacement. It offers superior precision (±0.2% vs. ±0.5%) and lower temperature coefficient (25 ppm/°C vs. 100 ppm/°C), but output current is limited to 5 mA versus 20 mA. Use this part only if your application requires output current ≤ 5 mA and benefits from enhanced precision.

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

A: Yes. All listed substitute parts use the SOT-23-5 (SC-74A) package format, ensuring mechanical and pin compatibility with the original LM4128CMF-3.0.

Q: What compliance certifications apply to these parts?

A: LM4128CMFX-3.0/NOPB and LM4128CQ1MFX3.0/NOPB are RoHS3 compliant. LM4128CQ1MF3.0/NOPB and LM4128CQ1MFX3.0/NOPB carry AEC-Q100 automotive qualification. MAX6037AAUK30+T is RoHS3 compliant. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

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