LM4128DMF-1.8 Equivalent & Substitute Parts

Part Overview

The LM4128DMF-1.8 is a Series Voltage Reference IC with fixed 1.8V output, ±1% tolerance, and 20 mA output current in SOT-23-5 surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a 2.2V to 5.5V input range with low supply current of 100µA, suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Reference Type	Series
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Current - Output	20 mA
Tolerance	±1%
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)
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the LM4128DMF-1.8 is determined by strict electrical and mechanical parameter matching:

Critical Substitution Parameters:

Output voltage: 1.8V fixed
Output current capability: 20 mA
Tolerance: ±1%
Temperature coefficient: 100ppm/°C
Input voltage range: 2.2V ~ 5.5V
Supply current: 100µA
Package: SOT-23-5 (SC-74A, SOT-753)
Operating temperature range: -40°C ~ 125°C

All substitute parts listed maintain identical electrical specifications and physical packaging, ensuring direct functional replacement without circuit redesign. Differences exist only in product status, compliance certifications, and packaging format (bulk versus tape & reel).

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Range	Supply Current	Package	RoHS Status
LM4128DMF-1.8	Texas Instruments	Obsolete	1.8V	20 mA	±1%	100ppm/°C	2.2V ~ 5.5V	100µA	SOT-23-5	Non-compliant
LM4128DMF-1.8/NOPB	National Semiconductor	Active	1.8V	20 mA	±1%	100ppm/°C	2.2V ~ 5.5V	100µA	SOT-23-5	Not specified
LM4128DMFX-1.8/NOPB	Texas Instruments	Active	1.8V	20 mA	±1%	100ppm/°C	2.2V ~ 5.5V	100µA	SOT-23-5	ROHS3 Compliant
LM4128DQ1MF1.8/NOPB	Texas Instruments	Active	1.8V	20 mA	±1%	100ppm/°C	2.2V ~ 5.5V	100µA	SOT-23-5	ROHS3 Compliant
LM4128DQ1MFX1.8/NOPB	Texas Instruments	Active	1.8V	20 mA	±1%	100ppm/°C	2.2V ~ 5.5V	100µA	SOT-23-5	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production: LM4128DMFX-1.8/NOPB, LM4128DQ1MF1.8/NOPB, and LM4128DQ1MFX1.8/NOPB are all active products with ROHS3 compliance. These parts are suitable for new designs and ongoing production requiring modern compliance standards.

For Automotive Applications: LM4128DQ1MF1.8/NOPB and LM4128DQ1MFX1.8/NOPB carry AEC-Q100 automotive qualification, making them appropriate for automotive-grade designs.

For Legacy System Support: LM4128DMF-1.8/NOPB (National Semiconductor) remains active and provides continuity for systems already in production, though it lacks specified RoHS compliance documentation.

Packaging Considerations:

Tape & Reel (TR) packaging: LM4128DMFX-1.8/NOPB, LM4128DQ1MF1.8/NOPB, LM4128DQ1MFX1.8/NOPB
Bulk packaging: LM4128DMF-1.8/NOPB

All parts share identical SOT-23-5 physical packaging and electrical specifications, enabling direct PCB-level substitution.

Frequently Asked Questions (FAQ)

Q: Can LM4128DMF-1.8 be directly replaced with LM4128DMFX-1.8/NOPB? A: Yes. Both parts deliver identical electrical performance: 1.8V fixed output, ±1% tolerance, 20 mA output current, and 100ppm/°C temperature coefficient. The primary difference is product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). Physical packaging is identical SOT-23-5.

Q: What is the difference between LM4128DQ1MF1.8/NOPB and LM4128DQ1MFX1.8/NOPB? A: Both parts are electrically and functionally identical with AEC-Q100 automotive qualification. The suffix "X" in LM4128DQ1MFX1.8/NOPB indicates extended temperature or processing specifications. Electrical parameters remain unchanged.

Q: Are the automotive-qualified variants (DQ1) suitable for non-automotive applications? A: Yes. Automotive-qualified parts meet or exceed commercial-grade specifications. LM4128DQ1MF1.8/NOPB and LM4128DQ1MFX1.8/NOPB can be used in any application requiring the specified 1.8V reference performance.

Q: Does packaging format (bulk versus tape & reel) affect electrical performance? A: No. Packaging format affects only handling, storage, and assembly processes. Electrical specifications and performance are identical regardless of whether the part is supplied in bulk or tape & reel format.

Q: Which substitute part should be selected for new designs? A: LM4128DMFX-1.8/NOPB or the automotive-qualified variants (LM4128DQ1MF1.8/NOPB, LM4128DQ1MFX1.8/NOPB) are recommended for new designs. All three are active products with ROHS3 compliance and full availability.

Q: Is the original LM4128DMF-1.8 still available? A: The original part is classified as obsolete. However, 2300 pieces are currently in stock. For ongoing production, active substitute parts are recommended.

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