LM4128CMF-4.1 Equivalent & Substitute Parts

Part Overview

The LM4128CMF-4.1 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 4.096V output with ±0.5% tolerance in a SOT-23-5 surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. 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	±0.5%
Temperature Coefficient	100 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 LM4128CMF-4.1 is determined by electrical and mechanical parameter equivalence across the following criteria:

Critical Substitution Parameters:

Fixed output voltage of 4.096V
Output tolerance of ±0.5%
Temperature coefficient of 100 ppm/°C
Output current of 20 mA
Input voltage range of 4.496V ~ 5.5V
Supply current of 100 µA
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 package compatibility. Differences exist only in product status (active vs. obsolete), packaging format (bulk vs. tape & reel), RoHS compliance level, and automotive qualification where applicable.

Parameter Comparison

Parameter	LM4128CMF-4.1	LM4128CMF-4.1/NOPB	LM4128CMFX-4.1/NOPB	LM4128CQ1MF4.1/NOPB	LM4128CQ1MFX4.1/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	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
Temperature Coefficient	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	Commercial	Commercial	Commercial	Automotive	Automotive
Qualification	—	—	—	AEC-Q100	AEC-Q100
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	1310 Pcs New Original In Stock	1572 Pcs New Original In Stock	834 Pcs New Original In Stock	2540 Pcs New Original In Stock	724 Pcs New Original In Stock

Engineering Selection Recommendations

For New Designs and Production: Select LM4128CMF-4.1/NOPB, LM4128CMFX-4.1/NOPB, LM4128CQ1MF4.1/NOPB, or LM4128CQ1MFX4.1/NOPB. All are active products with ROHS3 compliance, ensuring regulatory alignment and long-term availability.

For Automotive Applications: LM4128CQ1MF4.1/NOPB and LM4128CQ1MFX4.1/NOPB carry AEC-Q100 qualification, meeting automotive industry standards for reliability and performance in vehicle electronics.

For Commercial Applications: LM4128CMF-4.1/NOPB and LM4128CMFX-4.1/NOPB are suitable for non-automotive applications requiring ROHS3 compliance without automotive qualification requirements.

Packaging Considerations: All active substitutes are supplied in Tape & Reel (TR) format for automated assembly. The original LM4128CMF-4.1 is available in bulk format but is obsolete. Tape & Reel packaging is standard for production environments and provides superior handling and traceability.

Frequently Asked Questions (FAQ)

Q: Can LM4128CMF-4.1 be directly replaced with LM4128CMF-4.1/NOPB? A: Yes. Both parts are electrically and mechanically identical. The primary difference is product status (obsolete vs. active) and packaging format (bulk vs. tape & reel). The /NOPB suffix indicates lead-free, RoHS3 compliant construction.

Q: What is the difference between commercial and automotive grades? A: LM4128CQ1MF4.1/NOPB and LM4128CQ1MFX4.1/NOPB are automotive-grade parts qualified to AEC-Q100 standards, ensuring enhanced reliability testing and performance validation for vehicle applications. Commercial-grade parts (LM4128CMF-4.1/NOPB and LM4128CMFX-4.1/NOPB) meet standard industrial specifications without automotive qualification.

Q: Are all substitute parts pin-compatible? A: Yes. All substitute parts use the SOT-23-5 package with identical pinout and electrical characteristics, ensuring direct PCB compatibility without design modifications.

Q: What does the "X" designation in part numbers indicate? A: The "X" suffix (LM4128CMFX-4.1/NOPB and LM4128CQ1MFX4.1/NOPB) indicates extended temperature range or manufacturing process variation. Electrical specifications remain identical to non-X variants.

Q: Is RoHS3 compliance mandatory for my application? A: RoHS3 compliance is required for products sold in the European Union and many other regions. All active substitute parts listed are ROHS3 compliant. The original LM4128CMF-4.1 is RoHS non-compliant and should not be used in new designs intended for regulated markets.

Q: Which substitute part offers the best inventory availability? A: LM4128CQ1MF4.1/NOPB has the highest inventory level at 2540 pieces in stock, followed by LM4128CMF-4.1/NOPB at 1572 pieces.

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