LM4128AMFX-4.1 Equivalent & Substitute Parts

Part Overview

The LM4128AMFX-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 a 20 mA output current capability and 100µA 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	75ppm/°C
Noise - 0.1Hz to 10Hz	350µVp-p
Voltage - Input	4.496V ~ 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 LM4128AMFX-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
Temperature coefficient of 75ppm/°C
Input voltage range of 4.496V ~ 5.5V
Supply current of 100µA
Operating temperature range of -40°C ~ 125°C
SOT-23-5 package configuration
Series reference type with fixed output

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Differences exist only in product status (active vs. obsolete), packaging format (bulk vs. tape & reel), and automotive qualification grades where applicable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Output Voltage	Tolerance	Temp Coefficient	Output Current	Input Voltage	Supply Current	Operating Temp	Package Type	RoHS Status	Automotive Grade	Inventory
LM4128AMFX-4.1	Texas Instruments	Obsolete	Bulk	4.096V	±0.1%	75ppm/°C	20 mA	4.496V ~ 5.5V	100µA	-40°C ~ 125°C	SOT-23-5	Non-compliant	No	2880 Pcs
LM4128AMFX-4.1/NOPB	Texas Instruments	Active	Tape & Reel	4.096V	±0.1%	75ppm/°C	20 mA	4.496V ~ 5.5V	100µA	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	No	730 Pcs
LM4128AMF-4.1/NOPB	Texas Instruments	Active	Tape & Reel	4.096V	±0.1%	75ppm/°C	20 mA	4.496V ~ 5.5V	100µA	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	No	2095 Pcs
LM4128AQ1MF4.1/NOPB	Texas Instruments	Active	Tape & Reel	4.096V	±0.1%	75ppm/°C	20 mA	4.496V ~ 5.5V	100µA	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	Yes (AEC-Q100)	1891 Pcs
LM4128AQ1MFX4.1/NOPB	Texas Instruments	Active	Tape & Reel	4.096V	±0.1%	75ppm/°C	20 mA	4.496V ~ 5.5V	100µA	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	Yes (AEC-Q100)	736 Pcs

Engineering Selection Recommendations

All substitute parts maintain complete electrical and mechanical compatibility with the LM4128AMFX-4.1. Selection should be based on the following criteria:

For RoHS3 Compliance Requirements: LM4128AMFX-4.1/NOPB, LM4128AMF-4.1/NOPB, LM4128AQ1MF4.1/NOPB, and LM4128AQ1MFX4.1/NOPB are all ROHS3 compliant, whereas the original LM4128AMFX-4.1 is non-compliant.

For Automotive Applications: LM4128AQ1MF4.1/NOPB and LM4128AQ1MFX4.1/NOPB carry AEC-Q100 automotive qualification, suitable for automotive-grade designs.

For Active Product Status: All substitute parts except the original LM4128AMFX-4.1 maintain active product status, ensuring long-term availability and manufacturing support.

For Packaging Format: LM4128AMFX-4.1/NOPB and LM4128AQ1MFX4.1/NOPB are supplied in tape & reel format with extended temperature range marking (X suffix), while LM4128AMF-4.1/NOPB and LM4128AQ1MF4.1/NOPB are also tape & reel without the extended marking designation.

Frequently Asked Questions (FAQ)

Q: Can LM4128AMFX-4.1 be directly replaced with LM4128AMFX-4.1/NOPB?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is that LM4128AMFX-4.1/NOPB is active and ROHS3 compliant, while the original is obsolete and non-compliant. The /NOPB suffix indicates lead-free plating.

Q: What is the difference between LM4128AMF-4.1/NOPB and LM4128AMFX-4.1/NOPB?

A: Both parts are electrically identical with the same 4.096V output, ±0.1% tolerance, and SOT-23-5 package. The X designation in LM4128AMFX-4.1/NOPB indicates extended temperature range marking on the component. Functionally, they are interchangeable.

Q: Are the automotive-grade variants (LM4128AQ1MF4.1/NOPB and LM4128AQ1MFX4.1/NOPB) suitable for non-automotive applications?

A: Yes. Automotive-grade parts meet or exceed standard industrial specifications. The AEC-Q100 qualification indicates additional testing and reliability assurance, making them suitable for any application requiring the LM4128 4.096V reference.

Q: Does packaging format (tape & reel vs. bulk) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical specifications and performance are identical regardless of packaging format.

Q: Can I use these substitutes in existing designs without circuit modifications?

A: Yes. All substitute parts maintain identical electrical specifications, input/output voltage ranges, current ratings, and temperature coefficients. No circuit modifications are required for direct substitution.

Q: What is the significance of the ROHS3 compliance difference?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. For designs subject to RoHS requirements, ROHS3 compliant variants (all substitutes except the original LM4128AMFX-4.1) must be used.

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