LM3671MF-2.8 Equivalent & Substitute Parts

Part Overview

The LM3671MF-2.8 is a buck switching regulator IC from Texas Instruments, delivering a fixed 2.8V output at 600mA. This device operates as a step-down converter with a single positive output, designed for surface mount applications in the SC-74A (SOT-753) package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

LM3671MF-2.8

Texas InstrumentsIn Stock: 731LM3671MF-2.8 Datasheet

Current PartRFQ

LM3671MF-2.8/NOPB

National SemiconductorIn Stock: 2160LM3671MF-2.8/NOPB Datasheet

DirectRFQ

LM3674MF-2.8/NOPB

Texas InstrumentsIn Stock: 1948LM3674MF-2.8/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3671MF-2.8 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution validity:

• Fixed output voltage of 2.8V
• Output current capability of 600mA
• Input voltage range of 2.7V to 5.5V
• Switching frequency of 2MHz
• Synchronous rectifier topology
• SC-74A (SOT-753) package configuration
• Surface mount mounting type
• Buck (step-down) topology with single positive output

All identified substitutes maintain these core electrical specifications and physical package requirements, ensuring direct functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The LM3671MF-2.8/NOPB serves as a direct functional equivalent with identical electrical specifications and maintains active product status from National Semiconductor. This part is suitable for applications requiring the original LM3671MF-2.8 specifications without additional compliance constraints.

The LM3674MF-2.8/NOPB, also from Texas Instruments, provides equivalent electrical performance with the advantage of active product status and ROHS3 compliance certification. The operating temperature range differs slightly (-30°C to 85°C versus -40°C to 85°C), which may be relevant for applications requiring extended low-temperature operation below -30°C. For new designs or applications with RoHS compliance requirements, the LM3674MF-2.8/NOPB is the preferred selection.

Frequently Asked Questions (FAQ)

Q: Can LM3671MF-2.8/NOPB be used as a direct replacement for LM3671MF-2.8?

A: Yes. Both parts deliver identical electrical specifications: 2.8V fixed output, 600mA current capability, 2.7V to 5.5V input range, 2MHz switching frequency, and SC-74A package configuration. The primary difference is product status; LM3671MF-2.8/NOPB is active while the original is obsolete.

Q: What is the difference between LM3671MF-2.8/NOPB and LM3674MF-2.8/NOPB?

A: Both parts are electrically equivalent with matching output voltage, current, input range, and switching frequency. The LM3674MF-2.8/NOPB offers ROHS3 compliance and active product status. The operating temperature minimum differs: LM3671MF-2.8/NOPB operates from -40°C while LM3674MF-2.8/NOPB operates from -30°C.

Q: Are all substitute parts in the same package?

A: Yes. All listed parts use the SC-74A (SOT-753) surface mount package, ensuring mechanical and electrical compatibility on existing PCB layouts.

Q: Which substitute should be selected for new designs?

A: Selection depends on compliance requirements. For RoHS3 compliance, choose LM3674MF-2.8/NOPB. For applications requiring -40°C minimum operating temperature, verify LM3671MF-2.8/NOPB specifications. Both parts maintain active product status.

Q: Are there packaging format differences among the substitutes?

A: Yes. LM3671MF-2.8/NOPB is supplied in Bulk packaging, while LM3674MF-2.8/NOPB is supplied in Tape & Reel (TR) format. Both are suitable for production assembly; packaging selection depends on procurement and assembly process requirements.