LM3674MF-1.875 Equivalent & Substitute Parts

Part Overview

The LM3674MF-1.875 is a buck switching regulator IC from Texas Instruments designed for positive fixed 1.875V 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 ongoing production requirements.

Substiute Parts

LM3674MF-1.875

Texas InstrumentsIn Stock: 1049LM3674MF-1.875 Datasheet

Current PartRFQ

LM3674MF-1.875/NOPB

Texas InstrumentsIn Stock: 1665LM3674MF-1.875/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3674MF-1.875 is determined by strict equivalence across the following critical parameters:

• Output voltage: 1.875V fixed
• Output current capability: 600mA
• Input voltage range: 2.7V to 5.5V minimum and maximum
• Switching frequency: 2MHz
• Synchronous rectification: Present
• Package type: SC-74A, SOT-753 (SOT-23-5)
• Mounting configuration: Surface Mount
• Operating temperature range: -30°C to 85°C

The LM3674MF-1.875/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 LM3674MF-1.875/NOPB is the direct equivalent for the obsolete LM3674MF-1.875. Both parts share identical electrical and mechanical specifications. Selection between these parts is determined by:

• Product Status: The LM3674MF-1.875/NOPB carries Active status, ensuring continued availability and manufacturing support from Texas Instruments.
• RoHS Compliance: The substitute part meets ROHS3 compliance requirements, whereas the original part is RoHS non-compliant. This distinction is critical for applications subject to environmental regulations.
• Packaging Format: The substitute is supplied in Tape & Reel format, standard for production environments, while the original uses tube packaging.

For new designs and production applications, the LM3674MF-1.875/NOPB is the appropriate selection. For legacy system maintenance where the original part is still available, compatibility is assured due to identical pinout, electrical performance, and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the LM3674MF-1.875/NOPB replace the LM3674MF-1.875 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The substitute part operates within the same input voltage range (2.7V to 5.5V), delivers the same 600mA output current at 1.875V fixed output, and uses the identical SC-74A, SOT-753 package. PCB layout and schematic modifications are not required.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" designation indicates the part is supplied without lead (Pb) in the solder ball or lead finish, consistent with RoHS3 compliance requirements. This affects only the material composition of the component leads and does not alter electrical or thermal performance.

Q: Are there differences in thermal performance between these parts?

A: No. Both parts operate across the same temperature range (-30°C to 85°C) and share identical thermal characteristics due to matching package type and internal design.

Q: What packaging format should be specified for production orders?

A: The LM3674MF-1.875/NOPB is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes. Tube packaging is available only for the obsolete part number.

Q: Are there any compliance or certification differences?

A: The LM3674MF-1.875/NOPB meets ROHS3 compliance and REACH Unaffected status. The original part is RoHS non-compliant. Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.