LM4128AMF-1.8 Equivalent & Substitute Parts

Part Overview

The LM4128AMF-1.8 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 1.8V 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 2.2V to 5.5V input range with 20 mA output current capability and is suitable for precision voltage reference applications requiring low noise and stable temperature performance.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Current - Output	20 mA
Tolerance	±0.1%
Temperature Coefficient	75ppm/°C
Noise - 0.1Hz to 10Hz	170µVp-p
Voltage - Input	2.2V ~ 5.5V
Current - Supply	100µA
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM4128AMF-1.8 is determined by strict equivalence across the following critical parameters:

Output voltage: 1.8V fixed
Output tolerance: ±0.1%
Output current: 20 mA
Temperature coefficient: 75ppm/°C
Input voltage range: 2.2V ~ 5.5V
Supply current: 100µA
Operating temperature range: -40°C ~ 125°C
Package type: SOT-23-5 (SC-74A, SOT-753)
Mounting type: Surface Mount

All substitute parts listed maintain identical electrical specifications and package compatibility. Differences exist only in product status (active vs. obsolete), packaging format (Cut Tape, Tape & Reel), and automotive qualification grades where applicable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Tolerance	Temp Coeff	Input Range	Output Current	Package	RoHS Status	Grade	Inventory
LM4128AMF-1.8	Texas Instruments	Obsolete	1.8V	±0.1%	75ppm/°C	2.2V ~ 5.5V	20 mA	SOT-23-5	RoHS non-compliant	Standard	1048 Pcs
LM4128AMF-1.8/NOPB	Texas Instruments	Active	1.8V	±0.1%	75ppm/°C	2.2V ~ 5.5V	20 mA	SOT-23-5	ROHS3 Compliant	Standard	3100 Pcs
LM4128AMFX-1.8/NOPB	Texas Instruments	Active	1.8V	±0.1%	75ppm/°C	2.2V ~ 5.5V	20 mA	SOT-23-5	ROHS3 Compliant	Standard	1566 Pcs
LM4128AQ1MF1.8/NOPB	Texas Instruments	Active	1.8V	±0.1%	75ppm/°C	2.2V ~ 5.5V	20 mA	SOT-23-5	ROHS3 Compliant	Automotive (AEC-Q100)	3200 Pcs
LM4128AQ1MFX1.8/NOPB	Texas Instruments	Active	1.8V	±0.1%	75ppm/°C	2.2V ~ 5.5V	20 mA	SOT-23-5	ROHS3 Compliant	Automotive (AEC-Q100)	723 Pcs

Engineering Selection Recommendations

For direct replacement of the obsolete LM4128AMF-1.8, select LM4128AMF-1.8/NOPB. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. Packaging format (Cut Tape & Digi-Reel) accommodates standard production workflows.

For applications requiring automotive-grade components with AEC-Q100 qualification, select either LM4128AQ1MF1.8/NOPB or LM4128AQ1MFX1.8/NOPB. Both variants deliver the same electrical performance with automotive-grade certification. The /NOPB suffix indicates lead-free, RoHS-compliant construction across all active alternatives.

All substitute parts are manufactured by Texas Instruments and share identical SOT-23-5 package geometry, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LM4128AQ1MF1.8/NOPB be used in non-automotive applications? A: Yes. Automotive-grade parts meet or exceed standard industrial specifications. The AEC-Q100 qualification represents additional testing and reliability screening, making these parts suitable for any application requiring the specified electrical parameters.

Q: What is the difference between LM4128AMFX-1.8/NOPB and LM4128AMF-1.8/NOPB? A: Both parts are electrically identical. The primary difference is packaging format: LM4128AMFX-1.8/NOPB is supplied in Tape & Reel (TR) format, while LM4128AMF-1.8/NOPB is supplied in Cut Tape (CT) & Digi-Reel format. Select based on production equipment compatibility and volume requirements.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts (those with /NOPB suffix) are ROHS3 compliant. The original LM4128AMF-1.8 is RoHS non-compliant. For new designs or production requiring RoHS compliance, use any of the active alternatives.

Q: Can these parts be used interchangeably on the same PCB? A: Yes. All substitute parts share identical SOT-23-5 package dimensions and pin configurations. No PCB modifications are required for substitution.

Q: What does the /NOPB suffix indicate? A: /NOPB indicates lead-free, RoHS-compliant construction with no plumbum (lead) content. This is the current manufacturing standard for all active Texas Instruments voltage reference products.

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