LM2670S-ADJ Buck Switching Regulator IC

Part Overview

The LM2670S-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 voltage from 1.2V to 37V. The device operates at a switching frequency of 260kHz and is housed in a TO-263-8 (D2PAK) surface mount package.

The LM2670S-ADJ has reached Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for ongoing production and support requirements.

Substiute Parts

LM2670S-ADJ

Texas InstrumentsIn Stock: 2135LM2670S-ADJ Datasheet

Current PartRFQ

LM2670S-ADJ/NOPB

Texas InstrumentsIn Stock: 17137LM2670S-ADJ/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2670S-ADJ is determined by strict equivalence across the following critical parameters:

• Topology and Function: Buck (step-down) switching regulator with positive adjustable output
• Electrical Performance: Input voltage range 8V to 40V, output voltage adjustability from 1.2V to 37V, 3A output current capability
• Switching Frequency: 260kHz operation
• Package Compatibility: TO-263-8 (D2PAK) surface mount configuration with identical pinout
• Temperature Rating: -40°C to 125°C junction temperature range
• Regulatory Compliance: ROHS3 compliance and EAR99 classification

Substitute parts must match all electrical specifications and package requirements to ensure direct functional replacement without circuit redesign or PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

The LM2670S-ADJ/NOPB is the direct functional equivalent and manufacturer-recommended substitute for the LM2670S-ADJ. Both devices share identical electrical specifications, package configuration, and regulatory compliance status. The primary distinction is product lifecycle status: the original LM2670S-ADJ is in Last Time Buy phase, while the LM2670S-ADJ/NOPB maintains Active product status with significantly higher inventory availability (17,050 units versus 2,100 units).

For new designs and ongoing production requirements, the LM2670S-ADJ/NOPB is the appropriate selection to ensure long-term supply continuity. The /NOPB suffix indicates lead-free plating and represents the current manufacturing standard for this device family. Both parts are ROHS3 compliant and carry identical EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the LM2670S-ADJ/NOPB directly replace the LM2670S-ADJ without circuit modification?

A: Yes. Both devices are electrically and mechanically identical. The LM2670S-ADJ/NOPB features the same input/output voltage ranges, current rating, switching frequency, and TO-263-8 package pinout. No schematic or PCB layout changes are required.

Q: What does the /NOPB suffix indicate?

A: The /NOPB designation specifies lead-free plating on the device leads, representing the current manufacturing standard for RoHS3 compliance. This is the standard configuration for active production.

Q: Why is the original LM2670S-ADJ marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number variant. The LM2670S-ADJ/NOPB is the active replacement that maintains full functional equivalence while ensuring ongoing availability and support.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant, carry EAR99 export classification, and share identical moisture sensitivity levels (MSL 3, 168 hours). No compliance differences exist between the two part numbers.

Q: What is the inventory status for each part?

A: The LM2670S-ADJ has 2,100 units available as Last Time Buy stock. The LM2670S-ADJ/NOPB has 17,050 units in active inventory, providing significantly greater supply security for production planning.