LM2679S-3.3 Equivalent & Substitute Parts

Part Overview

The LM2679S-3.3 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 3.3V output at 5A maximum current. This device operates across an input voltage range of 8V to 40V and is housed in a TO-263-8 (D2PAK) surface mount package. The main part number is currently in Last Time Buy status, making identification of active equivalent parts essential for ongoing design support and procurement planning.

Substiute Parts

LM2679S-3.3

Texas InstrumentsIn Stock: 3068LM2679S-3.3 Datasheet

Current PartRFQ

LM2679S-3.3/NOPB

Texas InstrumentsIn Stock: 908LM2679S-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2679S-3.3 is determined by strict equivalence across the following critical parameters:

• Output voltage specification (3.3V fixed)
• Maximum output current rating (5A)
• Input voltage operating range (8V to 40V minimum/maximum)
• Switching topology (buck converter)
• Package form factor (TO-263-8 D2PAK)
• Thermal operating range (-40°C to 125°C)
• Switching frequency (260kHz)

The LM2679S-3.3/NOPB is the manufacturer-recommended equivalent part, maintaining identical electrical specifications and package configuration while differing only in product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The LM2679S-3.3/NOPB is the direct equivalent for the LM2679S-3.3. Both parts are ROHS3 compliant with identical electrical and thermal specifications. The primary distinction is product lifecycle status: the original LM2679S-3.3 is designated Last Time Buy, while the LM2679S-3.3/NOPB maintains Active status from Texas Instruments. For new designs and ongoing procurement, the LM2679S-3.3/NOPB is the appropriate selection to ensure long-term component availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the LM2679S-3.3/NOPB be used as a direct replacement for LM2679S-3.3?

A: Yes. Both parts are electrically and mechanically identical, with matching output voltage (3.3V), current rating (5A), input voltage range (8V to 40V), package type (TO-263-8 D2PAK), and thermal specifications (-40°C to 125°C). The /NOPB variant maintains Active product status.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation indicates the part is supplied without lead (Pb) plating, consistent with RoHS3 compliance requirements. This is a packaging and compliance notation, not a functional difference.

Q: Are there any compliance differences between these parts?

A: Both parts are ROHS3 compliant with MSL rating 3 (168 hours). The LM2679S-3.3/NOPB is REACH Affected, while the original LM2679S-3.3 is REACH Unaffected. Both carry EAR99 ECCN classification.

Q: What is the significance of Last Time Buy status?

A: Last Time Buy status indicates the manufacturer will no longer produce the LM2679S-3.3 after a specified date. The LM2679S-3.3/NOPB, with Active status, represents the current production equivalent and is recommended for all new procurement.

Q: Are the package dimensions identical?

A: Yes. Both parts use the TO-263-8 (D2PAK with 7 leads plus tab) package configuration, ensuring identical PCB footprint and thermal interface characteristics.