LM3671MF-1.6 Equivalent & Substitute Parts

Part Overview

The LM3671MF-1.6 is a buck switching regulator IC from Texas Instruments designed for positive fixed 1.6V output applications. This device delivers 600mA output current with a 2MHz switching frequency and integrated synchronous rectification. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The LM3671MF-1.6/NOPB variant provides functional equivalence with active product status from National Semiconductor.

Substiute Parts

LM3671MF-1.6

Texas InstrumentsIn Stock: 7748LM3671MF-1.6 Datasheet

Current PartRFQ

LM3671MF-1.6/NOPB

National SemiconductorIn Stock: 1794LM3671MF-1.6/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3671MF-1.6 is determined by strict equivalence across the following critical parameters:

• Input voltage range: 2.7V to 5.5V
• Fixed output voltage: 1.6V
• Output current capacity: 600mA
• Switching topology: Buck with synchronous rectification
• Switching frequency: 2MHz
• Package form factor: SOT-23-5 (SC-74A, SOT-753)
• Operating temperature range: -40°C to 85°C

The LM3671MF-1.6/NOPB meets all specified electrical and mechanical parameters, establishing direct substitution eligibility. The "/NOPB" suffix indicates lead-free (Pb-free) compliance and bulk packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The LM3671MF-1.6/NOPB is the direct substitute for the obsolete LM3671MF-1.6. Selection is based on the following engineering criteria:

• The substitute part maintains identical electrical specifications across all critical parameters: input voltage range, fixed output voltage, output current, switching frequency, and operating temperature range.
• The substitute part retains the same physical package (SOT-23-5) and mounting configuration, ensuring PCB layout compatibility without redesign.
• The substitute part carries active product status, ensuring long-term availability and supply chain continuity compared to the obsolete original part.
• Both parts share identical export classification (ECCN: EAR99) and tariff codes (HTSUS: 8542.39.0001), maintaining regulatory consistency.
• The "/NOPB" designation indicates lead-free compliance, aligning with modern manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the LM3671MF-1.6/NOPB be used as a direct replacement for the LM3671MF-1.6?

A: Yes. Both parts are electrically and mechanically equivalent across all specified parameters. The substitute part is pin-compatible and requires no circuit modifications.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix denotes lead-free (Pb-free) solder termination and bulk packaging. This aligns with RoHS compliance requirements for modern manufacturing.

Q: Are there any package compatibility concerns?

A: No. Both parts use the SOT-23-5 package (SC-74A, SOT-753). PCB footprints and land patterns are identical, requiring no layout changes.

Q: Why is the original LM3671MF-1.6 marked as obsolete?

A: Product obsolescence is determined by the manufacturer. The active substitute part ensures design continuity and procurement availability.

Q: What are the critical parameters for substitution eligibility?

A: Input voltage range (2.7V–5.5V), fixed output voltage (1.6V), output current (600mA), switching frequency (2MHz), synchronous rectification capability, and SOT-23-5 package form factor must all match exactly.

Q: Are there inventory differences between the two parts?

A: Yes. The original part has 7,727 pieces in stock, while the substitute has 1,706 pieces. Availability should be verified with your supplier before procurement.