LM3671MF-1.375 Equivalent & Substitute Parts

Part Overview

The LM3671MF-1.375 is a buck switching regulator IC from Texas Instruments designed for positive fixed 1.375V output applications. This device delivers 600mA output current with a 2MHz switching frequency and integrated synchronous rectification. The main part number is currently listed as obsolete, which necessitates identification of active equivalent alternatives for new designs and production continuity.

Substiute Parts

LM3671MF-1.375

Texas InstrumentsIn Stock: 3731LM3671MF-1.375 Datasheet

Current PartRFQ

LM3671MF-1.375/NOPB

Texas InstrumentsIn Stock: 1202LM3671MF-1.375/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3671MF-1.375 is determined by strict equivalence across the following critical parameters:

• Output voltage (fixed at 1.375V)
• Output current capability (600mA)
• Input voltage range (2.7V to 5.5V)
• Switching frequency (2MHz)
• Synchronous rectification capability
• Package type (SC-74A, SOT-753 / SOT-23-5)
• Operating temperature range (-40°C to 85°C)
• Topology (buck converter, positive output configuration)

The LM3671MF-1.375/NOPB qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The LM3671MF-1.375/NOPB is the direct equivalent for the obsolete LM3671MF-1.375. Selection between these parts is determined by application requirements and regulatory compliance:

• For new designs and production environments requiring RoHS3 compliance, the LM3671MF-1.375/NOPB is the appropriate choice.
• The /NOPB designation indicates lead-free termination and RoHS3 compliance status.
• Both parts share identical electrical performance and mechanical compatibility, ensuring drop-in replacement capability.
• The LM3671MF-1.375/NOPB is available in Tape & Reel packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the LM3671MF-1.375/NOPB directly replace the LM3671MF-1.375?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB variant is the active production equivalent with RoHS3 compliance and lead-free termination.

Q: What does the /NOPB suffix indicate?

A: /NOPB designates a lead-free, RoHS3-compliant part with no plumbum (lead) in the termination finish.

Q: Are there differences in package compatibility?

A: No. Both parts use the SC-74A, SOT-753 package (SOT-23-5 supplier designation). PCB footprints and assembly processes are identical.

Q: Why is the original part marked obsolete?

A: The LM3671MF-1.375 has been superseded by the RoHS3-compliant LM3671MF-1.375/NOPB variant. Texas Instruments transitioned to lead-free manufacturing standards.

Q: What is the inventory status for substitutes?

A: The LM3671MF-1.375/NOPB is actively produced and stocked. The original LM3671MF-1.375 has limited remaining inventory (3630 pcs).

Q: Are there any thermal or performance differences?

A: No. Operating temperature range, switching frequency, output current capability, and thermal characteristics are identical across both part numbers.