LM2679SX-5.0 Equivalent & Substitute Parts

Part Overview

The LM2679SX-5.0 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 5V output at 5A maximum current. The 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 LM2679SX-5.0 carries a Last Time Buy product status, indicating discontinued production. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this specific power management topology and electrical performance.

Substiute Parts

LM2679SX-5.0

Texas InstrumentsIn Stock: 1440LM2679SX-5.0 Datasheet

Current PartRFQ

LM2679SX-5.0/NOPB

Texas InstrumentsIn Stock: 3520LM2679SX-5.0/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2679SX-5.0 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 5V
• Maximum output current of 5A
• Input voltage range of 8V to 40V minimum and maximum
• Buck topology with positive output configuration
• Switching frequency of 260kHz
• TO-263-8 (D2PAK) surface mount package with 7 leads plus tab
• Operating temperature range of -40°C to 125°C
• No synchronous rectifier implementation
• ROHS3 compliance and MSL 3 rating

The LM2679SX-5.0/NOPB variant qualifies as a direct substitute based on identical electrical specifications, package configuration, and compliance certifications. The primary distinction is product status: the base LM2679SX-5.0 is Last Time Buy, while the /NOPB variant maintains Active status with higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The LM2679SX-5.0/NOPB is the direct substitute for the LM2679SX-5.0. Both parts are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications. The /NOPB designation indicates lead-free plating and halogen-free packaging, consistent with ROHS3 compliance requirements.

Selection between these variants should be based on product lifecycle status and supply availability. The LM2679SX-5.0 carries Last Time Buy status, indicating limited future availability. The LM2679SX-5.0/NOPB maintains Active product status with significantly higher inventory levels (3450 units versus 1420 units), providing greater supply chain security for new designs and ongoing production requirements.

Both parts satisfy identical compliance certifications: ROHS3 compliance, REACH unaffected status, and MSL 3 moisture sensitivity rating. PCB layout, thermal management, and external component requirements remain unchanged between variants.

Frequently Asked Questions (FAQ)

Q: Can the LM2679SX-5.0/NOPB be used as a direct replacement for the LM2679SX-5.0?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates lead-free plating and halogen-free packaging. No circuit modifications, PCB layout changes, or external component adjustments are required.

Q: What does the Last Time Buy status mean for the LM2679SX-5.0?

A: Last Time Buy indicates that Texas Instruments has discontinued production of this part number. Existing inventory may be available through authorized distributors, but future availability is not guaranteed. The LM2679SX-5.0/NOPB variant remains in active production.

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

A: No. Both parts operate identically across all specified parameters: 5V fixed output, 5A maximum current, 8V to 40V input range, 260kHz switching frequency, and -40°C to 125°C operating temperature range.

Q: Is the TO-263-8 (D2PAK) package identical for both parts?

A: Yes. Both the LM2679SX-5.0 and LM2679SX-5.0/NOPB use the same TO-263-8 D2PAK package with 7 leads plus tab. PCB footprints and thermal pad dimensions are identical.

Q: What is the significance of the MSL 3 rating?

A: MSL 3 indicates Moisture Sensitivity Level 3, requiring storage at controlled humidity and a maximum of 168 hours of floor life after opening the moisture barrier bag. Both parts carry identical MSL 3 ratings and require the same handling procedures.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the LM2679SX-5.0 and LM2679SX-5.0/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.