LM2673T-ADJ Buck Switching Regulator IC

Part Overview

The LM2673T-ADJ is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion applications. This positive adjustable output regulator delivers 3A continuous current with an input voltage range of 8V to 40V and adjustable output from 1.2V to 37V. The device operates at a fixed switching frequency of 260kHz and is housed in a TO-220-7 package with formed leads for through-hole mounting.

The LM2673T-ADJ carries a Last Time Buy product status, indicating that the original part number is being phased out. Identifying qualified substitute parts ensures design continuity and supply chain reliability for applications currently using this regulator.

Substiute Parts

LM2673T-ADJ

Texas InstrumentsIn Stock: 3482LM2673T-ADJ Datasheet

Current PartRFQ

LM2673T-ADJ/NOPB

Texas InstrumentsIn Stock: 1584LM2673T-ADJ/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2673T-ADJ is determined by strict equivalence across the following critical parameters:

• Topology and Function: Buck (step-down) converter with positive adjustable output
• Electrical Specifications: Input voltage 8V–40V, output 1.2V–37V adjustable, 3A output current, 260kHz switching frequency
• Package and Mounting: TO-220-7 formed leads, through-hole mounting
• Thermal Performance: Operating temperature range -40°C to 125°C (TJ)
• Compliance: ROHS3 compliance, REACH unaffected status, EAR99 classification

The LM2673T-ADJ/NOPB qualifies as a direct substitute based on identical electrical and mechanical specifications. The primary distinction is packaging format and product status transition.

Parameter Comparison

Engineering Selection Recommendations

The LM2673T-ADJ/NOPB is the qualified substitute for the LM2673T-ADJ. Both parts share identical electrical performance, thermal characteristics, and mechanical specifications. The transition from LM2673T-ADJ (Last Time Buy status) to LM2673T-ADJ/NOPB (Active status) reflects standard product lifecycle management by Texas Instruments.

Selection between these parts should be based on:

• Product Availability: LM2673T-ADJ/NOPB maintains active production status and supply continuity
• Compliance Requirements: Both parts meet ROHS3 compliance and REACH unaffected status
• Packaging Logistics: LM2673T-ADJ/NOPB is supplied in tube packaging, which may affect procurement and handling procedures
• Design Continuity: Electrical and thermal performance are identical, requiring no circuit redesign

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts are electrically and mechanically identical. The LM2673T-ADJ/NOPB is the active production equivalent and can be substituted without circuit modification.

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

A: The "/NOPB" designation indicates the part is supplied without plumbum (lead-free), reflecting RoHS3 compliance. Both the LM2673T-ADJ and LM2673T-ADJ/NOPB are lead-free compliant.

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

A: No. Both parts operate across the identical temperature range of -40°C to 125°C (TJ) and share the same thermal characteristics.

Q: Does the packaging format affect electrical performance?

A: No. The tube packaging format of LM2673T-ADJ/NOPB does not affect electrical specifications or performance. Packaging differences are logistical only.

Q: What is the significance of the Last Time Buy status on LM2673T-ADJ?

A: Last Time Buy status indicates that Texas Instruments is discontinuing production of the LM2673T-ADJ. The LM2673T-ADJ/NOPB is the active production part and should be used for new designs and ongoing supply requirements.

Q: Are both parts suitable for -40°C to 125°C operating environments?

A: Yes. Both the LM2673T-ADJ and LM2673T-ADJ/NOPB are rated for junction temperatures from -40°C to 125°C and are suitable for industrial and extended temperature applications.