LM2671LD-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2671LD-ADJ is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with positive adjustable output. This device delivers 500mA output current across an input voltage range of 6.5V to 40V, with adjustable output voltage from 1.21V to 37V. The main part number is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

LM2671LD-ADJ

Texas InstrumentsIn Stock: 976LM2671LD-ADJ Datasheet

Current PartRFQ

LM2671LD-ADJ/NOPB

Texas InstrumentsIn Stock: 2089LM2671LD-ADJ/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2671LD-ADJ is determined by strict equivalence across the following critical parameters:

• Identical base product number (LM2671)
• Matching output topology (buck, positive adjustable)
• Identical electrical specifications (input voltage range 6.5V–40V, output voltage 1.21V–37V, 500mA output current)
• Identical switching frequency (260kHz)
• Identical package and pinout (16-WFDFN Exposed Pad, 16-WSON 5x5)
• Identical operating temperature range (-40°C to 125°C)
• Surface mount compatibility

The LM2671LD-ADJ/NOPB is the manufacturer-recommended substitute, differing only in product status and moisture sensitivity classification, with no impact on electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM2671LD-ADJ/NOPB is the direct substitute for the LM2671LD-ADJ. Both parts are electrically and mechanically identical across all functional parameters. The primary distinction is product lifecycle status: the original part number is in Last Time Buy phase, while the /NOPB variant remains in Active production status.

For new designs or long-term procurement, the LM2671LD-ADJ/NOPB is the recommended selection due to its active product status and continued availability. Both parts meet ROHS3 compliance and carry identical electrical specifications, ensuring drop-in compatibility in existing circuit designs.

The difference in Moisture Sensitivity Level (MSL 1 versus MSL 3) reflects standard handling classifications and does not affect electrical performance or circuit operation. The REACH status difference indicates regulatory classification only and does not impact component functionality.

Frequently Asked Questions (FAQ)

Q: Can LM2671LD-ADJ/NOPB be used as a direct replacement for LM2671LD-ADJ?

A: Yes. Both parts are electrically and mechanically identical. All electrical specifications, package dimensions, pinout, and operating characteristics are identical. The /NOPB variant is the manufacturer-recommended substitute.

Q: What does the /NOPB suffix mean?

A: The /NOPB designation indicates "No Plumbum" (lead-free) packaging. This is a standard Texas Instruments suffix denoting RoHS compliance. Both the main part and substitute are RoHS3 compliant.

Q: Why is the original part in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing the part number. The LM2671LD-ADJ/NOPB remains in active production and is the recommended long-term alternative.

Q: Are there differences in moisture sensitivity between these parts?

A: The original part has MSL 1 (unlimited moisture sensitivity), while the /NOPB variant has MSL 3 (168 hours). This affects storage and handling procedures but does not impact electrical performance or circuit operation.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use identical 16-WSON (5x5) packaging with the same pinout and footprint. No PCB layout modifications are required for substitution.

Q: What is the difference in REACH status between these parts?

A: REACH status is a regulatory classification. The difference does not affect component functionality, electrical performance, or circuit compatibility.