LM3671MF-ADJ Equivalent & Substitute Parts

Part Overview

The LM3671MF-ADJ is a buck switching regulator IC from Texas Instruments designed for positive adjustable output voltage regulation. This device delivers 600mA output current with an adjustable output range from 1.1V to 3.3V, operating from a 2.7V to 5.5V input supply. The component is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The LM3671MF-ADJ/NOPB serves as the direct active substitute, maintaining identical electrical and mechanical specifications while offering improved availability and compliance status.

Substiute Parts

LM3671MF-ADJ

Texas InstrumentsIn Stock: 9682LM3671MF-ADJ Datasheet

Current PartRFQ

LM3671MF-ADJ/NOPB

Texas InstrumentsIn Stock: 30245LM3671MF-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3671MF-ADJ is determined by strict equivalence across the following critical parameters:

• Input voltage range: 2.7V to 5.5V
• Output voltage adjustability: 1.1V to 3.3V
• Output current capacity: 600mA
• Switching frequency: 2MHz
• Synchronous rectifier topology: Present
• Package type: SOT-23-5 (SC-74A, SOT-753)
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Surface Mount

The LM3671MF-ADJ/NOPB maintains complete electrical and mechanical compatibility with the main part number, differing only in product status (active vs. obsolete) and RoHS compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM3671MF-ADJ/NOPB is the direct equivalent for the obsolete LM3671MF-ADJ. Selection between these parts is determined by product availability and regulatory requirements:

For new designs and production requiring active component status, the LM3671MF-ADJ/NOPB is the appropriate choice. This part maintains identical electrical performance and mechanical compatibility while offering ROHS3 compliance certification, addressing modern regulatory requirements.

For legacy system maintenance where the original LM3671MF-ADJ is specified, the LM3671MF-ADJ/NOPB provides drop-in compatibility with no circuit modifications required. The transition from RoHS non-compliant to ROHS3 compliant status does not affect electrical or thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the LM3671MF-ADJ/NOPB replace the LM3671MF-ADJ in existing designs?

A: Yes. The LM3671MF-ADJ/NOPB is electrically and mechanically identical to the LM3671MF-ADJ. No circuit modifications, PCB layout changes, or firmware updates are required for substitution.

Q: What is the difference between LM3671MF-ADJ and LM3671MF-ADJ/NOPB?

A: The primary differences are product status and RoHS compliance. The LM3671MF-ADJ is obsolete and RoHS non-compliant, while the LM3671MF-ADJ/NOPB is active and ROHS3 compliant. All electrical specifications, output voltage range, current capacity, and package type are identical.

Q: Are there any package or pinout differences?

A: No. Both parts use the SOT-23-5 package (SC-74A, SOT-753) with identical pinout and mechanical dimensions. PCB footprints are directly compatible.

Q: What output voltage range does this regulator support?

A: The adjustable output voltage range is 1.1V to 3.3V. The output voltage is set using external resistor dividers on the feedback pin.

Q: What is the maximum input voltage?

A: The maximum input voltage is 5.5V. The minimum input voltage is 2.7V. Operation outside this range is not specified.

Q: Is this regulator suitable for battery-powered applications?

A: Yes. The 2.7V minimum input voltage and adjustable output down to 1.1V make this regulator suitable for single-cell lithium-ion battery applications and other low-voltage power systems.

Q: What is the switching frequency?

A: The switching frequency is fixed at 2MHz, which determines the size and type of external filter components required for the application.