LM2679T-12 Equivalent & Substitute Parts

Part Overview

The LM2679T-12 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 12V output and 5A current capacity. The device operates across an input voltage range of 8V to 40V and features a 260kHz switching frequency in a TO-220-7 through-hole package.

The LM2679T-12 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesigns requiring active component alternatives.

Substiute Parts

LM2679T-12

Texas InstrumentsIn Stock: 4075LM2679T-12 Datasheet

Current PartRFQ

LM2679T-12/NOPB

Texas InstrumentsIn Stock: 2307LM2679T-12/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2679T-12 is determined by the following critical parameters:

• Output voltage specification (12V fixed)
• Output current rating (5A minimum)
• Input voltage operating range (8V to 40V)
• Switching frequency (260kHz)
• Package configuration (TO-220-7 Formed Leads)
• Mounting type (Through Hole)
• Operating temperature range (-40°C to 125°C)

Parts meeting all these electrical and mechanical specifications are classified as direct substitutes. Variations in product status, packaging format (tube vs. bulk), RoHS compliance, or REACH classification do not affect functional interchangeability but may impact procurement, regulatory compliance, or inventory management.

Parameter Comparison

Engineering Selection Recommendations

The LM2679T-12/NOPB is a direct functional substitute for the LM2679T-12. Both devices share identical electrical specifications, output characteristics, and physical packaging.

Selection between these parts should be based on:

• Product status: The LM2679T-12/NOPB is active and currently available, whereas the LM2679T-12 is obsolete. For new designs or ongoing production, the active part number is preferred for supply chain continuity.
• Regulatory compliance: The LM2679T-12/NOPB meets ROHS3 compliance requirements, while the original LM2679T-12 is RoHS non-compliant. Applications subject to RoHS regulations must use the compliant variant.
• Packaging and procurement: The LM2679T-12/NOPB is supplied in tube packaging, which may affect inventory management and handling procedures compared to alternative packaging formats.

Frequently Asked Questions (FAQ)

Q: Can the LM2679T-12/NOPB replace the LM2679T-12 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The LM2679T-12/NOPB provides the same 12V fixed output, 5A current capacity, input voltage range of 8V to 40V, and TO-220-7 package configuration. No circuit modifications are required.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix indicates that the part is supplied without plumbum (lead-free). This designation reflects RoHS3 compliance and environmental regulations affecting component manufacturing and distribution.

Q: Are there differences in thermal performance between these parts?

A: No. Both parts operate across the same temperature range (-40°C to 125°C junction temperature) and share identical thermal characteristics based on the TO-220-7 package specification.

Q: Which part should be selected for new production?

A: The LM2679T-12/NOPB should be selected for new production due to its active product status, current availability, and RoHS3 compliance. The LM2679T-12 is obsolete and should not be specified for new designs.

Q: Are there any package or mounting differences?

A: No. Both parts use the TO-220-7 Formed Leads package with through-hole mounting. PCB layout and thermal management considerations remain identical between the two part numbers.