LM4128CMFX-4.1 Equivalent & Substitute Parts

Part Overview

The LM4128CMFX-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 and substitute parts necessary for ongoing design support and production continuity. 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.

Substiute Parts

LM4128CMFX-4.1

Texas InstrumentsIn Stock: 3084LM4128CMFX-4.1 Datasheet

Current PartRFQ

LM4128CMFX-4.1/NOPB

Texas InstrumentsIn Stock: 845LM4128CMFX-4.1/NOPB Datasheet

DirectRFQ

LM4128CMF-4.1/NOPB

Texas InstrumentsIn Stock: 1601LM4128CMF-4.1/NOPB Datasheet

Parametric EquivalentRFQ

LM4128CQ1MF4.1/NOPB

Texas InstrumentsIn Stock: 2635LM4128CQ1MF4.1/NOPB Datasheet

Parametric EquivalentRFQ

LM4128CQ1MFX4.1/NOPB

Texas InstrumentsIn Stock: 826LM4128CQ1MFX4.1/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM4128CMFX-4.1 is determined by electrical and mechanical parameter alignment across the following criteria:

Critical Matching Parameters:

• Fixed output voltage: 4.096V
• Output tolerance: ±0.5%
• Output current: 20 mA
• 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 package compatibility. Differences exist in product status (Active vs. Obsolete), packaging format (Tape & Reel vs. standard), RoHS compliance status, and automotive qualification levels. These variations do not affect functional interchangeability in applications where the core electrical parameters are required.

Parameter Comparison

Engineering Selection Recommendations

For Active Production (Recommended): Select LM4128CMFX-4.1/NOPB, LM4128CMF-4.1/NOPB, LM4128CQ1MF4.1/NOPB, or LM4128CQ1MFX4.1/NOPB. All are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The /NOPB designation indicates lead-free, halogen-free construction.

For Automotive Applications: LM4128CQ1MF4.1/NOPB and LM4128CQ1MFX4.1/NOPB carry AEC-Q100 automotive qualification, suitable for automotive-grade designs requiring enhanced reliability standards.

For Standard Industrial Applications: LM4128CMFX-4.1/NOPB and LM4128CMF-4.1/NOPB provide equivalent electrical performance without automotive qualification, appropriate for general industrial and consumer applications.

Packaging Considerations: All substitute parts are supplied in Tape & Reel (TR) format, standard for high-volume production. The original LM4128CMFX-4.1 uses standard packaging; verify reel specifications with procurement if specific packaging requirements exist.

Frequently Asked Questions (FAQ)

Q: Can LM4128CMFX-4.1 be directly replaced with LM4128CMFX-4.1/NOPB? A: Yes. Both parts are electrically identical with matching output voltage (4.096V), tolerance (±0.5%), current ratings (20 mA output, 100 µA supply), temperature coefficient (100 ppm/°C), and SOT-23-5 package. The /NOPB designation indicates lead-free construction and ROHS3 compliance. The primary difference is product status: the original is obsolete while the /NOPB variant is active.

Q: What is the difference between LM4128CMF-4.1/NOPB and LM4128CQ1MF4.1/NOPB? A: Electrical specifications are identical. The LM4128CQ1MF4.1/NOPB variant includes AEC-Q100 automotive qualification, making it suitable for automotive applications requiring enhanced reliability testing and traceability. Both maintain the same 4.096V output, ±0.5% tolerance, and SOT-23-5 package.

Q: Are all substitute parts compatible with the original PCB layout? A: Yes. All substitute parts use the identical SOT-23-5 package (SC-74A, SOT-753) with matching pin configuration, footprint, and surface mount requirements. No PCB redesign is necessary.

Q: Does the Tape & Reel packaging affect electrical performance? A: No. Tape & Reel is a supply format for automated assembly. Electrical specifications, performance characteristics, and reliability remain unchanged. This format is standard for production quantities.

Q: Which substitute should be selected for new designs? A: For new designs, select an active product with ROHS3 compliance: LM4128CMFX-4.1/NOPB, LM4128CMF-4.1/NOPB, LM4128CQ1MF4.1/NOPB, or LM4128CQ1MFX4.1/NOPB. For automotive applications, specify LM4128CQ1MF4.1/NOPB or LM4128CQ1MFX4.1/NOPB to ensure AEC-Q100 compliance.

Q: What does the "X" in LM4128CMFX-4.1 indicate? A: The "X" designation is part of the Texas Instruments part numbering scheme. Parts with and without "X" (LM4128CMF-4.1/NOPB vs. LM4128CMFX-4.1/NOPB) are electrically equivalent with identical specifications and package compatibility.

Q: Is RoHS compliance required for substitution? A: For new production and designs subject to regulatory requirements, ROHS3-compliant variants (all /NOPB parts) are recommended. The original LM4128CMFX-4.1 is RoHS non-compliant; substitutes with ROHS3 compliance ensure regulatory alignment for current manufacturing standards.