LM2599T-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2599T-ADJ is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with positive adjustable output. This device delivers 3A output current with an input voltage range of 4.5V to 40V and adjustable output from 1.23V to 37V, operating at 150kHz switching frequency in a TO-220-7 through-hole package.

The LM2599T-ADJ carries a Last Time Buy product status, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Substiute Parts

LM2599T-ADJ

Texas InstrumentsIn Stock: 2356LM2599T-ADJ Datasheet

Current PartRFQ

LM2599T-ADJ/NOPB

Texas InstrumentsIn Stock: 1218LM2599T-ADJ/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2599T-ADJ is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck (step-down) converter with positive adjustable output configuration
• Electrical Specifications: Input voltage 4.5V–40V, adjustable output 1.23V–37V, 3A output current, 150kHz switching frequency
• Package & Mounting: TO-220-7 through-hole package with formed leads
• Operating Range: -40°C to 125°C junction temperature
• Compliance: ROHS3 compliance and equivalent regulatory certifications

The LM2599T-ADJ/NOPB qualifies as a direct manufacturer-recommended substitute, maintaining identical electrical and mechanical specifications while offering active product status.

Parameter Comparison

Engineering Selection Recommendations

The LM2599T-ADJ/NOPB is the manufacturer-recommended substitute for the LM2599T-ADJ. Both parts are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications across all critical parameters. The primary distinction is product lifecycle status: the original LM2599T-ADJ is designated Last Time Buy, while the LM2599T-ADJ/NOPB carries Active status, ensuring continued availability and manufacturing support.

Both parts satisfy ROHS3 compliance requirements and equivalent regulatory certifications. The "/NOPB" suffix indicates lead-free plating, consistent with modern manufacturing standards. For new designs and production continuity, the LM2599T-ADJ/NOPB is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: What is the difference between LM2599T-ADJ and LM2599T-ADJ/NOPB?

A: Both parts are electrically and mechanically identical. The "/NOPB" designation indicates lead-free plating. The primary difference is product status: LM2599T-ADJ is Last Time Buy (discontinued), while LM2599T-ADJ/NOPB is Active (currently manufactured).

Q: Can I use LM2599T-ADJ/NOPB as a direct replacement for LM2599T-ADJ?

A: Yes. The LM2599T-ADJ/NOPB is a direct substitute with identical specifications: 3A output current, 4.5V–40V input range, 1.23V–37V adjustable output, 150kHz switching frequency, and TO-220-7 package.

Q: Are there any compatibility concerns with the TO-220-7 package?

A: No. Both parts use the same TO-220-7 through-hole package with formed leads, ensuring identical PCB footprint and thermal characteristics.

Q: What compliance certifications apply to both parts?

A: Both the LM2599T-ADJ and LM2599T-ADJ/NOPB are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99.

Q: Why is the original LM2599T-ADJ marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production. The LM2599T-ADJ/NOPB represents the active continuation of this product line with equivalent performance.