LM4128DMFX-4.1 Equivalent & Substitute Parts

Part Overview

The LM4128DMFX-4.1 is a series voltage reference IC from Texas Instruments, delivering a fixed 4.096V output with ±1% tolerance in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. 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 Part Number	LM4128DMFX-4.1
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	4.096V
Output Current	20 mA
Tolerance	±1%
Temperature Coefficient	100 ppm/°C
Noise (0.1Hz to 10Hz)	350 µVp-p
Input Voltage Range	4.496V ~ 5.5V
Supply Current	100 µA
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM4128DMFX-4.1 is determined by strict equivalence across the following critical parameters:

Output voltage: 4.096V fixed
Output current capability: 20 mA
Voltage tolerance: ±1%
Temperature coefficient: 100 ppm/°C
Input voltage range: 4.496V ~ 5.5V
Supply current: 100 µA
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 physical packaging, ensuring direct functional replacement. Differences in product status, packaging format (Tape & Reel vs. Bulk), RoHS compliance, and automotive qualification do not affect electrical interchangeability.

Parameter Comparison

Parameter	LM4128DMFX-4.1	LM4128DMFX-4.1/NOPB	LM4128DMF-4.1/NOPB	LM4128DQ1MF4.1/NOPB	LM4128DQ1MFX4.1/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	National Semiconductor	Texas Instruments
Output Voltage	4.096V	4.096V	4.096V	4.096V	4.096V
Output Current	20 mA	20 mA	20 mA	20 mA	20 mA
Tolerance	±1%	±1%	±1%	±1%	±1%
Temperature Coefficient	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C
Input Voltage Range	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V
Supply Current	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	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant
Automotive Grade	No	No	No	Yes (AEC-Q100)	Yes (AEC-Q100)
Packaging Format	Not specified	Tape & Reel (TR)	Bulk	Bulk	Tape & Reel (TR)
Inventory Availability	680 Pcs	1086 Pcs	1405 Pcs	30558 Pcs	1010 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete LM4128DMFX-4.1, the following selection criteria apply:

Active Product Status Priority: LM4128DMFX-4.1/NOPB, LM4128DMF-4.1/NOPB, LM4128DQ1MF4.1/NOPB, and LM4128DQ1MFX4.1/NOPB are all active products, ensuring long-term availability and manufacturing support compared to the obsolete original part.

RoHS Compliance: LM4128DMFX-4.1/NOPB and LM4128DQ1MFX4.1/NOPB are ROHS3 compliant, meeting current environmental and regulatory requirements. Selection of these variants is appropriate for applications subject to RoHS directives.

Automotive Applications: LM4128DQ1MF4.1/NOPB and LM4128DQ1MFX4.1/NOPB carry AEC-Q100 automotive qualification. These variants are suitable for automotive-grade designs requiring certified components.

Packaging Format: LM4128DMFX-4.1/NOPB and LM4128DQ1MFX4.1/NOPB are supplied in Tape & Reel format, appropriate for high-volume automated assembly. LM4128DMF-4.1/NOPB and LM4128DQ1MF4.1/NOPB are supplied in Bulk format, suitable for lower-volume or manual assembly operations.

Inventory Availability: LM4128DQ1MF4.1/NOPB offers the highest inventory availability at 30,558 pieces, providing supply security for immediate procurement needs.

Frequently Asked Questions (FAQ)

Q: Can LM4128DMFX-4.1 be directly replaced with LM4128DMFX-4.1/NOPB?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is product status (obsolete vs. active) and packaging format. The /NOPB designation indicates lead-free, RoHS3 compliant manufacturing, while the original part is RoHS non-compliant.

Q: What is the difference between the standard LM4128 variants and the -Q1 variants?

A: The -Q1 designation indicates automotive-grade qualification to AEC-Q100 standards. Electrical specifications remain identical. Selection of -Q1 variants is required only for automotive applications with specific qualification requirements.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the identical SOT-23-5 package (SC-74A, SOT-753), ensuring pin-for-pin compatibility and direct PCB layout compatibility without redesign.

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: Which substitute part should be selected for new designs?

A: For new designs, select an active product variant based on application requirements: LM4128DMFX-4.1/NOPB for standard industrial applications with RoHS compliance, or LM4128DQ1MFX4.1/NOPB for automotive applications requiring AEC-Q100 qualification.

Q: Is the 100 ppm/°C temperature coefficient maintained across all substitute parts?

A: Yes. All substitute parts maintain the identical 100 ppm/°C temperature coefficient, ensuring consistent thermal performance across the operating range of -40°C to 125°C.

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