LM2576HVT-ADJ/LB03 Equivalent & Substitute Parts

Part Overview

The LM2576HVT-ADJ/LB03 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 4V to 60V and adjustable output from 1.23V to 57V. The device operates at a fixed switching frequency of 52kHz and is housed in a TO-220-5 package with formed leads.

The main part number LM2576HVT-ADJ/LB03 carries a Last Time Buy status, indicating production discontinuation. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications currently using this component.

Substiute Parts

LM2576HVT-ADJ/LB03

Texas InstrumentsIn Stock: 2891LM2576HVT-ADJ/LB03 Datasheet

Current PartRFQ

LM2576HVT-ADJ/NOPB

Texas InstrumentsIn Stock: 15773LM2576HVT-ADJ/NOPB Datasheet

DirectRFQ

LM2576HVT-ADJ/LF03

Texas InstrumentsIn Stock: 3276LM2576HVT-ADJ/LF03 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2576HVT-ADJ/LB03 is determined by strict equivalence across the following critical parameters:

• Electrical Performance: Input voltage range (4V–60V), adjustable output voltage (1.23V–57V), output current (3A), and switching frequency (52kHz) must be identical
• Functional Topology: Buck (step-down) topology with positive adjustable output configuration
• Package Compatibility: TO-220-5 package with through-hole mounting
• Thermal Specifications: Operating temperature range of -40°C to 125°C
• Regulatory Compliance: ROHS3 compliance and MSL Level 1 rating

All substitute parts listed below meet these criteria without exception. Differences in packaging designations (formed leads vs. standard leads) and product status do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

LM2576HVT-ADJ/NOPB is the primary direct substitute. This part maintains Active product status with Texas Instruments, ensuring continued availability and technical support. It carries identical electrical specifications and regulatory compliance (ROHS3, MSL Level 1). The NOPB designation indicates standard lead finish without formed leads, which does not affect electrical or mechanical function in through-hole applications.

LM2576HVT-ADJ/LF03 is the manufacturer-recommended alternative. This part also maintains Active status and includes formed leads matching the original LM2576HVT-ADJ/LB03 package specification. The LF03 designation indicates a specific lead finish variant. This option provides the closest physical match to the original component.

Both substitutes are fully compatible with existing PCB designs and application circuits. Selection between them depends on lead finish preference and inventory availability rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can LM2576HVT-ADJ/NOPB replace LM2576HVT-ADJ/LB03 in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The NOPB designation refers to lead finish only and does not affect performance in through-hole applications. PCB layouts and circuit designs require no modification.

Q: What is the difference between formed leads and standard leads?

A: Formed leads are pre-shaped for specific lead spacing and insertion angles. Standard leads are straight. Both types fit TO-220-5 through-hole packages. Formed leads may provide improved insertion consistency in automated assembly, but both are functionally equivalent for manual or automated placement.

Q: Why is LM2576HVT-ADJ/LB03 marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number variant. Substitute part numbers with Active status (LM2576HVT-ADJ/NOPB and LM2576HVT-ADJ/LF03) remain in production and are recommended for new designs and ongoing supply requirements.

Q: Are all three part numbers pin-compatible?

A: Yes. All three variants use the TO-220-5 package with identical pin assignments and electrical characteristics. No circuit modifications are required when substituting between these part numbers.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. LM2576HVT-ADJ/NOPB and LM2576HVT-ADJ/LF03 are both ROHS3 compliant with MSL Level 1 rating, matching the original LM2576HVT-ADJ/LB03 specifications.