LM2679SD-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2679SD-ADJ is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for positive adjustable step-down voltage regulation. This device delivers 5A output current with an adjustable output voltage range from 1.21V to 37V, operating from an 8V to 40V input supply at a switching frequency of 260kHz. The part is mounted in a 14-VDFN exposed pad surface mount package.

The LM2679SD-ADJ is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator topology.

Substiute Parts

LM2679SD-ADJ

Texas InstrumentsIn Stock: 989LM2679SD-ADJ Datasheet

Current PartRFQ

LM2679SD-ADJ/NOPB

Texas InstrumentsIn Stock: 2233LM2679SD-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2679SD-ADJ is determined by strict equivalence across the following critical parameters:

• Input voltage range: 8V to 40V
• Output voltage adjustability: 1.21V to 37V
• Output current capacity: 5A
• Switching frequency: 260kHz
• Topology: Buck (step-down)
• Output configuration: Positive, adjustable, single output
• Package: 14-VDFN exposed pad (14-VSON 5x6)
• Synchronous rectifier: Not present
• Operating temperature range: -40°C to 125°C

The LM2679SD-ADJ/NOPB is identified as a direct substitute based on identical electrical specifications, package configuration, and functional characteristics. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM2679SD-ADJ/NOPB is the direct substitute for the obsolete LM2679SD-ADJ. Both parts share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility.

The primary advantages of selecting LM2679SD-ADJ/NOPB are:

• Active product status ensures ongoing manufacturer support and availability
• ROHS3 compliance meets current environmental and regulatory requirements
• Tape & Reel packaging supports automated assembly processes
• Identical electrical performance across all specified parameters

Selection between these parts should be based on supply chain requirements, regulatory compliance mandates, and production volume considerations. The obsolete status of LM2679SD-ADJ makes LM2679SD-ADJ/NOPB the preferred choice for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can LM2679SD-ADJ/NOPB be used as a direct replacement for LM2679SD-ADJ?

A: Yes. Both parts are electrically and mechanically identical. They share the same input voltage range (8V–40V), output voltage adjustability (1.21V–37V), output current (5A), switching frequency (260kHz), and 14-VDFN package configuration. Pin-for-pin substitution is valid.

Q: What is the difference between LM2679SD-ADJ and LM2679SD-ADJ/NOPB?

A: The primary differences are product status, packaging format, and compliance certification. LM2679SD-ADJ is obsolete and supplied in bulk packaging with RoHS non-compliant status. LM2679SD-ADJ/NOPB is active, supplied in Tape & Reel format, and ROHS3 compliant.

Q: Are there any package compatibility concerns?

A: No. Both parts use the identical 14-VDFN exposed pad package (14-VSON 5x6). PCB footprints, thermal characteristics, and mechanical mounting are fully compatible.

Q: Does the ROHS3 compliance of LM2679SD-ADJ/NOPB affect circuit performance?

A: No. ROHS3 compliance is a material composition and environmental standard. It does not alter electrical performance, switching characteristics, or output regulation specifications.

Q: Which part should be selected for new designs?

A: LM2679SD-ADJ/NOPB should be selected for new designs. Its active status ensures long-term availability, manufacturer support, and compliance with current regulatory standards.