LM3676SD-ADJ Buck Switching Regulator IC

Part Overview

The LM3676SD-ADJ is a buck switching regulator IC manufactured by Texas Instruments, designed for positive adjustable output voltage regulation with 600mA output current capability. This device operates as a step-down converter with a single adjustable output, suitable for applications requiring regulated power from 2.9V to 5.5V input sources.

The LM3676SD-ADJ is currently classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance of systems utilizing this component.

Substiute Parts

LM3676SD-ADJ

Texas InstrumentsIn Stock: 2142LM3676SD-ADJ Datasheet

Current PartRFQ

LM3676SD-ADJ/NOPB

Texas InstrumentsIn Stock: 1863LM3676SD-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3676SD-ADJ is determined by strict equivalence across the following critical parameters:

• Input voltage range: 2.9V to 5.5V
• Output voltage range: 1.1V to 3.3V (adjustable)
• Output current capacity: 600mA
• Switching frequency: 2MHz
• Synchronous rectification capability: Present
• Package type: 8-WFDFN Exposed Pad (8-WSON 3x3)
• Operating temperature range: -30°C to 85°C
• Topology: Buck (step-down)
• Output configuration: Positive adjustable

The LM3676SD-ADJ/NOPB is identified as a direct substitute based on identical electrical specifications, package configuration, and thermal operating range. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The LM3676SD-ADJ/NOPB is the direct functional equivalent of the LM3676SD-ADJ. Both devices share identical electrical specifications, thermal characteristics, and package geometry, ensuring pin-for-pin and functional compatibility.

The LM3676SD-ADJ/NOPB is recommended for new designs and ongoing production due to its active product status. This part is ROHS3 compliant, whereas the original LM3676SD-ADJ is RoHS non-compliant. The LM3676SD-ADJ/NOPB is supplied in Tape & Reel format, which is standard for automated assembly processes.

For legacy systems currently using the obsolete LM3676SD-ADJ, the LM3676SD-ADJ/NOPB provides direct substitution without circuit redesign or layout modification, provided that RoHS compliance requirements are met by the end application.

Frequently Asked Questions (FAQ)

Q: Can the LM3676SD-ADJ/NOPB be used as a direct replacement for the LM3676SD-ADJ?

A: Yes. Both parts are electrically and mechanically identical. They share the same input voltage range (2.9V–5.5V), adjustable output voltage range (1.1V–3.3V), 600mA output current, 2MHz switching frequency, and 8-WFDFN package configuration. No circuit modifications are required.

Q: What is the difference between the LM3676SD-ADJ and LM3676SD-ADJ/NOPB?

A: The primary differences are product status and packaging format. The LM3676SD-ADJ is obsolete and supplied in bulk packaging. The LM3676SD-ADJ/NOPB is active and supplied in Tape & Reel format. Additionally, the LM3676SD-ADJ/NOPB is ROHS3 compliant, while the original part is RoHS non-compliant.

Q: Are there any thermal or electrical performance differences between these parts?

A: No. Both parts operate across the identical temperature range (-30°C to 85°C) and deliver the same electrical performance specifications. Synchronous rectification, switching frequency, and output current capacity are identical.

Q: Is the 8-WSON (3x3) package compatible with existing PCB layouts designed for the LM3676SD-ADJ?

A: Yes. Both parts use the 8-WFDFN Exposed Pad package in 8-WSON (3x3) configuration. PCB footprints, trace routing, and component placement require no modification.

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

A: The /NOPB suffix indicates that the part is supplied without plumbum (lead-free). This designation is associated with RoHS compliance and Tape & Reel packaging format.