LM4128DMFX-4.1/NOPB Equivalent & Substitute Parts

Part Overview

The LM4128DMFX-4.1/NOPB is a Series Voltage Reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±1% tolerance. This precision micropow device operates across -40°C to 125°C and is designed for applications requiring stable voltage references in power management circuits. The part is currently in active production status with 1086 units available in stock. Substitute parts are identified when electrical parameters, mechanical compatibility, and operational specifications align with the main part's functional requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4128DMFX-4.1/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Fixed
Voltage - Output (Fixed)	4.096V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	100ppm/°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
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM4128DMFX-4.1/NOPB are identified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Parameters for Substitution:

Fixed output voltage: 4.096V
Output current capability: 20 mA
Voltage tolerance: ±1%
Temperature coefficient: 100ppm/°C
Noise specification: 350µVp-p (0.1Hz to 10Hz)
Input voltage range: 4.496V ~ 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 identified substitute parts maintain identical electrical performance specifications and mechanical compatibility with the main part number.

Parameter Comparison

Parameter	LM4128DMFX-4.1/NOPB (Main)	LM4128DMF-4.1/NOPB	LM4128DQ1MF4.1/NOPB
Manufacturer	Texas Instruments	National Semiconductor	National Semiconductor
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Voltage - Output (Fixed)	4.096V	4.096V	4.096V
Current - Output	20 mA	20 mA	20 mA
Tolerance	±1%	±1%	±1%
Temperature Coefficient	100ppm/°C	100ppm/°C	100ppm/°C
Noise - 0.1Hz to 10Hz	350µVp-p	350µVp-p	350µVp-p
Voltage - Input	4.496V ~ 5.5V	4.496V ~ 5.5V	4.496V ~ 5.5V
Current - Supply	100µA	100µA	100µA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5
Product Status	Active	Active	Active
Grade	Standard	Standard	Automotive
Qualification	-	-	AEC-Q100

Engineering Selection Recommendations

All three parts maintain identical electrical and mechanical specifications, ensuring direct functional interchangeability in standard applications. Selection between these parts depends on application-specific requirements:

LM4128DMFX-4.1/NOPB (Texas Instruments): Primary choice for general industrial and commercial applications. Active production status with established supply chain. ROHS3 compliant and MSL Level 1 rated.

LM4128DMF-4.1/NOPB (National Semiconductor): Functionally equivalent alternative with identical electrical performance. Suitable for applications where National Semiconductor sourcing is preferred or required.

LM4128DQ1MF4.1/NOPB (National Semiconductor): Automotive-grade variant with AEC-Q100 qualification. Required for automotive applications meeting automotive industry standards and reliability requirements. Highest inventory availability at 30,558 units.

All parts are ROHS3 compliant and carry EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LM4128DMF-4.1/NOPB replace LM4128DMFX-4.1/NOPB in production designs?

A: Yes. Both parts deliver identical electrical specifications including 4.096V fixed output, ±1% tolerance, 20 mA output current, and 100ppm/°C temperature coefficient. Package compatibility (SOT-23-5) and operating temperature range (-40°C to 125°C) are identical. Substitution is electrically and mechanically valid.

Q: What is the difference between LM4128DQ1MF4.1/NOPB and the standard variants?

A: The LM4128DQ1MF4.1/NOPB is automotive-grade with AEC-Q100 qualification. Electrical and mechanical specifications are identical to standard variants. The automotive qualification is the distinguishing factor, making this part suitable for automotive applications requiring AEC-Q100 compliance.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-23-5 package (SC-74A, SOT-753) with identical pinout and mechanical dimensions. Direct PCB substitution is possible without layout modifications.

Q: What packaging differences exist between these parts?

A: LM4128DMFX-4.1/NOPB is supplied in Tape & Reel (TR) packaging. LM4128DMF-4.1/NOPB and LM4128DQ1MF4.1/NOPB are supplied in Bulk packaging. Electrical performance is unaffected by packaging format.

Q: Can automotive-grade LM4128DQ1MF4.1/NOPB be used in non-automotive applications?

A: Yes. Automotive-grade parts exceed standard reliability requirements and can be used in any application. The AEC-Q100 qualification represents additional quality assurance and is not restrictive for non-automotive use.

Q: Are moisture sensitivity levels identical across all three parts?

A: LM4128DMFX-4.1/NOPB specifies MSL Level 1 (Unlimited). Moisture sensitivity data for LM4128DMF-4.1/NOPB and LM4128DQ1MF4.1/NOPB was not provided in the specification data. Verify MSL requirements with the manufacturer for these variants if moisture-sensitive storage conditions apply.

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