LM3671MF-1.25 Equivalent & Substitute Parts

Part Overview

The LM3671MF-1.25 is a buck switching regulator IC from Texas Instruments designed for positive fixed 1.25V output applications. This device delivers 600mA output current with a 2MHz switching frequency and integrated synchronous rectification. The main part number (LM3671MF-1.25) is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

LM3671MF-1.25

Texas InstrumentsIn Stock: 20521LM3671MF-1.25 Datasheet

Current PartRFQ

LM3671MF-1.25/NOPB

Texas InstrumentsIn Stock: 2865LM3671MF-1.25/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3671MF-1.25 is determined by strict equivalence across the following critical parameters:

• Input voltage range: 2.7V to 5.5V
• Fixed output voltage: 1.25V
• Output current capacity: 600mA
• Switching frequency: 2MHz
• Synchronous rectification: Required
• Package type: SOT-23-5 (SC-74A, SOT-753)
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Surface Mount

The LM3671MF-1.25/NOPB represents the direct equivalent part, maintaining identical electrical specifications and physical packaging while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LM3671MF-1.25/NOPB is the direct functional and electrical equivalent of the obsolete LM3671MF-1.25. Selection of the /NOPB variant is supported by the following factors:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance meets current environmental and regulatory requirements
• Tape & Reel packaging accommodates automated assembly processes
• Identical electrical performance across all specified parameters
• Same physical package footprint and pinout configuration

For applications currently using the obsolete LM3671MF-1.25, transition to LM3671MF-1.25/NOPB provides equivalent performance with improved compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LM3671MF-1.25/NOPB be used as a direct replacement for LM3671MF-1.25?

A: Yes. Both parts share identical electrical specifications, output voltage, current rating, switching frequency, and SOT-23-5 package configuration. The /NOPB variant is the active production equivalent.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation indicates "No Plumbum" (lead-free) packaging, reflecting RoHS3 compliance and the absence of lead in the solder and component materials.

Q: Are there packaging differences between these parts?

A: The primary packaging difference is the delivery format. LM3671MF-1.25 is supplied in bulk, while LM3671MF-1.25/NOPB is supplied in Tape & Reel format, which is standard for automated manufacturing environments.

Q: Do both parts operate across the same input and output voltage ranges?

A: Yes. Both parts operate with input voltage from 2.7V to 5.5V and deliver a fixed 1.25V output at 600mA maximum current.

Q: Is the SOT-23-5 package footprint identical between both parts?

A: Yes. Both parts use the SC-74A, SOT-753 package designation with SOT-23-5 supplier device package, ensuring PCB layout compatibility.

Q: What is the switching frequency of these regulators?

A: Both parts operate at a fixed 2MHz switching frequency with integrated synchronous rectification.