LM4128AMF-4.1 Equivalent & Substitute Parts

Part Overview

The LM4128AMF-4.1 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 4.096V 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 -40°C to 125°C with 20 mA output current capability and 100 µA supply current, suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Fixed
Voltage - Output (Fixed)	4.096V
Current - Output	20 mA
Tolerance	±0.1%
Temperature Coefficient	75 ppm/°C
Noise (0.1Hz to 10Hz)	350 µVp-p
Voltage - Input	4.496V ~ 5.5V
Current - Supply	100 µA
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-4.1 is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 4.096V
Output tolerance of ±0.1%
Output current of 20 mA
Supply current of 100 µA
Input voltage range of 4.496V ~ 5.5V
Temperature coefficient of 75 ppm/°C
Noise specification of 350 µVp-p (0.1Hz to 10Hz)
Operating temperature range of -40°C ~ 125°C
SOT-23-5 package configuration
Surface mount mounting type

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

Parameter Comparison

Parameter	LM4128AMF-4.1	LM4128AMF-4.1/NOPB	LM4128AMFX-4.1/NOPB	LM4128AQ1MF4.1/NOPB	LM4128AQ1MFX4.1/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Output (Fixed)	4.096V	4.096V	4.096V	4.096V	4.096V
Current - Output	20 mA	20 mA	20 mA	20 mA	20 mA
Tolerance	±0.1%	±0.1%	±0.1%	±0.1%	±0.1%
Temperature Coefficient	75 ppm/°C	75 ppm/°C	75 ppm/°C	75 ppm/°C	75 ppm/°C
Noise (0.1Hz to 10Hz)	350 µVp-p	350 µVp-p	350 µVp-p	350 µVp-p	350 µVp-p
Voltage - Input	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V
Current - Supply	100 µA	100 µA	100 µA	100 µA	100 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Standard	Standard	Standard	AEC-Q100	AEC-Q100
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For new designs and production continuity, select from the active product variants. The LM4128AMF-4.1/NOPB and LM4128AMFX-4.1/NOPB are standard industrial-grade options with ROHS3 compliance. Both maintain identical electrical performance and package specifications as the obsolete LM4128AMF-4.1.

For automotive applications requiring AEC-Q100 qualification, the LM4128AQ1MF4.1/NOPB and LM4128AQ1MFX4.1/NOPB are the appropriate selections. These variants meet automotive reliability standards while maintaining all electrical and thermal specifications.

The suffix differences (standard vs. X-grade) and packaging format (Tape & Reel) do not affect functional equivalence. Selection should be based on application requirements, compliance mandates, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can LM4128AMF-4.1/NOPB directly replace the obsolete LM4128AMF-4.1?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is product status (active vs. obsolete) and packaging format. The /NOPB variant is supplied in Tape & Reel format and carries ROHS3 compliance.

Q: What is the difference between standard and X-grade variants?

A: The X-grade designation indicates extended temperature or performance screening. Both standard and X-grade variants maintain identical electrical specifications for the LM4128 series. Selection depends on application-specific reliability requirements.

Q: Are automotive-qualified variants (AQ1) suitable for non-automotive applications?

A: Yes. The LM4128AQ1MF4.1/NOPB and LM4128AQ1MFX4.1/NOPB meet AEC-Q100 automotive standards and are fully compatible with industrial and consumer applications. They provide additional qualification assurance without performance trade-offs.

Q: Does the SOT-23-5 package remain consistent across all variants?

A: Yes. All substitute parts use the SC-74A, SOT-753 package designation with SOT-23-5 supplier device package. PCB layout and footprint compatibility is maintained across all listed variants.

Q: What is the significance of ROHS3 compliance on the substitute parts?

A: ROHS3 compliance indicates conformance to current environmental and hazardous substance restrictions. The obsolete LM4128AMF-4.1 is RoHS non-compliant, while all active substitutes meet ROHS3 standards, making them suitable for regulated markets and modern supply chains.

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