LM4128CMF-1.8 Equivalent & Substitute Parts

Part Overview

The LM4128CMF-1.8 is a series voltage reference IC from Texas Instruments, delivering a fixed 1.8V output with ±0.5% tolerance. This component is classified as a Power Management (PMIC) device in the SOT-23-5 package. The main part number LM4128CMF-1.8 is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Substitute models maintain identical electrical specifications while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Current - Output	20 mA
Tolerance	±0.5%
Temperature Coefficient	100ppm/°C
Noise - 0.1Hz to 10Hz	170µVp-p
Voltage - Input	2.2V ~ 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)
ECCN	EAR99
HTSUS	8542.39.0001

Substitute Part Grouping Explanation

Substitution of the LM4128CMF-1.8 is determined by strict equivalence across the following critical parameters:

Output voltage: 1.8V fixed
Output current capability: 20 mA
Tolerance specification: ±0.5%
Temperature coefficient: 100ppm/°C
Noise performance: 170µVp-p (0.1Hz to 10Hz)
Input voltage range: 2.2V ~ 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 substitute parts listed maintain identical electrical and mechanical specifications. Differences exist only in product status, packaging format (Tape & Reel), RoHS compliance level, and automotive qualification where applicable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Tolerance	Output Current	Temperature Coefficient	Input Voltage Range	Operating Temperature	Package	RoHS Status	Automotive Grade	Inventory (Pcs)
LM4128CMF-1.8	Texas Instruments	Obsolete	1.8V	±0.5%	20 mA	100ppm/°C	2.2V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	RoHS non-compliant	No	2764
LM4128CMF-1.8/NOPB	Texas Instruments	Active	1.8V	±0.5%	20 mA	100ppm/°C	2.2V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	No	1163
LM4128CMFX-1.8/NOPB	Texas Instruments	Active	1.8V	±0.5%	20 mA	100ppm/°C	2.2V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	No	1316
LM4128CQ1MF1.8/NOPB	Texas Instruments	Active	1.8V	±0.5%	20 mA	100ppm/°C	2.2V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	Yes (AEC-Q100)	2588
LM4128CQ1MFX1.8/NOPB	Texas Instruments	Active	1.8V	±0.5%	20 mA	100ppm/°C	2.2V ~ 5.5V	-40°C ~ 125°C	SOT-23-5	ROHS3 Compliant	Yes (AEC-Q100)	1119

Engineering Selection Recommendations

For applications requiring the LM4128CMF-1.8, the following selection criteria apply based on product status and compliance requirements:

Standard Industrial Applications: LM4128CMF-1.8/NOPB or LM4128CMFX-1.8/NOPB are direct substitutes with active product status and ROHS3 compliance. Both maintain identical electrical performance and SOT-23-5 packaging. Selection between these two variants depends on internal qualification requirements specific to the design.

Automotive Applications: LM4128CQ1MF1.8/NOPB or LM4128CQ1MFX1.8/NOPB are qualified to AEC-Q100 automotive standards with ROHS3 compliance. These variants are suitable for automotive-grade designs requiring formal qualification documentation.

Compliance Transition: All active substitute parts provide ROHS3 compliance, addressing regulatory requirements for new designs. The obsolete status of LM4128CMF-1.8 necessitates migration to one of the active alternatives for production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM4128CMF-1.8/NOPB directly replace LM4128CMF-1.8 in existing designs?

A: Yes. Both parts deliver identical electrical specifications: 1.8V fixed output, ±0.5% tolerance, 20 mA output current, 100ppm/°C temperature coefficient, and SOT-23-5 packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance level.

Q: What is the difference between LM4128CMF-1.8/NOPB and LM4128CMFX-1.8/NOPB?

A: Both parts are parametrically equivalent with identical electrical performance and ROHS3 compliance. The difference lies in internal device qualification or manufacturing process variants. Selection should follow internal design documentation or supplier recommendations.

Q: Are the automotive-qualified variants (CQ1) suitable for non-automotive applications?

A: Yes. LM4128CQ1MF1.8/NOPB and LM4128CQ1MFX1.8/NOPB meet all electrical specifications of the standard variants and include additional AEC-Q100 automotive qualification. These can be used in any application requiring the specified electrical performance.

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

A: Yes. All substitute parts use the SOT-23-5 package (SC-74A, SOT-753 case designation). No PCB layout modifications are required when substituting between listed part numbers.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" suffix indicates lead-free (no-lead) packaging and ROHS3 compliance. This is a standard Texas Instruments designation for compliant devices.

Q: Which substitute part should be selected for new designs?

A: For new industrial designs, LM4128CMF-1.8/NOPB or LM4128CMFX-1.8/NOPB are appropriate. For automotive designs, LM4128CQ1MF1.8/NOPB or LM4128CQ1MFX1.8/NOPB provide required AEC-Q100 qualification. Selection between standard and "X" variants should follow internal qualification procedures.

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