LM2673T-12 Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2673T-12 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. This device functions as a step-down converter delivering a fixed 12V output at 3A maximum current from input sources ranging 8V to 40V. The main part number is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

LM2673T-12

Texas InstrumentsIn Stock: 5203LM2673T-12 Datasheet

Current PartRFQ

LM2673T-12/NOPB

National SemiconductorIn Stock: 914LM2673T-12/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2673T-12 is determined by strict equivalence across the following parameters:

• Output voltage configuration (fixed 12V)
• Maximum output current rating (3A)
• Input voltage operating range (8V to 40V minimum and maximum)
• Switching frequency (260kHz)
• Package and pinout compatibility (TO-220-7 Formed Leads)
• Operating temperature range (-40°C to 125°C)
• Topology (buck converter, positive output, single output)

The LM2673T-12/NOPB variant meets all these criteria and qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM2673T-12/NOPB is the qualified substitute for the obsolete LM2673T-12. Both parts share identical electrical specifications and mechanical packaging, ensuring direct compatibility in existing designs. The primary distinction is product status: the original part is obsolete while the substitute remains in active production.

For new designs or ongoing procurement, the LM2673T-12/NOPB is the appropriate selection. This variant maintains full compliance with the same regulatory framework (ECCN: EAR99, HTSUS: 8542.39.0001) and operates within identical environmental and electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the LM2673T-12/NOPB be used as a direct replacement for the LM2673T-12?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates lead-free plating, which does not affect functional compatibility. The substitute is pin-for-pin compatible and operates within the same voltage, current, and temperature specifications.

Q: What does the obsolete status of the LM2673T-12 mean for my application?

A: Obsolete status indicates the original part is no longer manufactured. The LM2673T-12/NOPB remains in active production and is the recommended source for continued supply. Existing inventory of the original part may still be available through authorized distributors.

Q: Are there any differences in package handling or mounting between these parts?

A: No. Both parts use the TO-220-7 Formed Leads package with through-hole mounting. PCB layout, thermal management, and mechanical assembly requirements remain identical.

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

A: The /NOPB suffix indicates the part uses lead-free plating on the leads. This is a manufacturing variation that does not alter electrical performance or functional compatibility with the original part.

Q: Can I use either part interchangeably in my existing design?

A: Yes. The electrical specifications, pinout, and package are identical. Either part will function identically in circuits designed for the LM2673T-12 12V 3A buck converter.