LM2576T-ADJ Equivalent & Substitute Parts

Part Overview

The LM2576T-ADJ is a buck switching regulator IC from onsemi designed for step-down voltage conversion with adjustable positive or negative output. This Through Hole mounted component operates across a 7V to 40V input range with a 3A output capacity and 52kHz switching frequency. The part is currently classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity.

Substiute Parts

LM2576T-ADJ

onsemiIn Stock: 28792LM2576T-ADJ Datasheet

Current PartRFQ

LM2576T-ADJG

onsemiIn Stock: 6682LM2576T-ADJG Datasheet

DirectRFQ

LM2575WT

Microchip TechnologyIn Stock: 5852LM2575WT Datasheet

SimilarRFQ

LM2576WT

Microchip TechnologyIn Stock: 5961LM2576WT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2576T-ADJ is determined by the following critical parameters: identical package type (TO-220-5), matching switching topology (buck), equivalent switching frequency (52kHz), compatible output configuration capability, and matching or exceeding current output rating (3A minimum). The LM2576T-ADJ supports both positive and negative output configurations with adjustable output voltage from 1.23V to 37V.

Two substitution categories are identified:

Direct Equivalent: LM2576T-ADJG maintains identical electrical specifications, output configuration (positive or negative), and current rating (3A) while offering active product status and improved RoHS compliance.

Functional Equivalent with Derating: LM2576WT and LM2575WT provide compatible buck topology and switching characteristics but with parameter variations requiring design consideration. LM2576WT matches the 3A current output and base part number but restricts output configuration to positive only. LM2575WT reduces output current to 1A, requiring load derating in applications exceeding this threshold.

Parameter Comparison

Engineering Selection Recommendations

LM2576T-ADJG is the primary substitute for new designs and production transitions. This part maintains full electrical and functional equivalence to the LM2576T-ADJ while offering active product status, ensuring long-term availability and supply chain stability. The LM2576T-ADJG achieves ROHS3 compliance, addressing regulatory requirements absent in the obsolete original part. Packaging remains identical (TO-220-5, Tube), enabling direct board-level substitution without layout modification.

LM2576WT serves as an alternative when positive-only output configuration is acceptable. This Microchip Technology part matches the 3A current rating and maintains identical switching topology and frequency. The reduced minimum input voltage (4V versus 7V) provides expanded operating range capability. ROHS3 compliance and active product status support long-term design viability. Applications requiring negative output capability must use LM2576T-ADJG.

LM2575WT is suitable only for applications with maximum output current requirements of 1A or less. While this part maintains the same switching characteristics and package type, the reduced current rating necessitates load derating analysis. This option is not recommended for designs currently operating at or near the 3A specification of the LM2576T-ADJ.

Frequently Asked Questions (FAQ)

Q: Can LM2576T-ADJG be used as a direct replacement for LM2576T-ADJ?

A: Yes. LM2576T-ADJG maintains identical electrical specifications, output configuration capability (positive or negative), current rating (3A), switching frequency (52kHz), and TO-220-5 package. The primary differences are product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the key limitation of LM2576WT compared to LM2576T-ADJ?

A: LM2576WT restricts output configuration to positive only, eliminating negative output capability. Applications requiring negative voltage generation must use LM2576T-ADJG. All other electrical parameters and the TO-220-5 package remain compatible.

Q: Why is LM2575WT listed as a functional equivalent if it has lower current output?

A: LM2575WT shares identical switching topology, frequency (52kHz), package type (TO-220-5), and adjustable output voltage range. However, the 1A current rating represents a significant derating from the 3A specification. This part is listed for reference only and is suitable only for applications with maximum load current of 1A or less.

Q: Are there any thermal or mounting differences between these parts?

A: All four parts use Through Hole mounting in TO-220-5 package and operate across the same temperature range (-40°C ~ 125°C). Thermal performance depends on application-specific PCB layout and heatsinking, which remain unchanged across substitutions.

Q: Does the lower minimum input voltage of LM2576WT and LM2575WT affect compatibility?

A: The reduced minimum input voltage (4V versus 7V) expands the operating range and does not create compatibility issues. Designs operating above 7V input voltage experience no functional difference. Designs operating between 4V and 7V benefit from extended capability with these Microchip parts.

Q: What compliance considerations apply to part selection?

A: LM2576T-ADJG, LM2576WT, and LM2575WT all achieve ROHS3 compliance, addressing modern regulatory requirements. The original LM2576T-ADJ is RoHS non-compliant. For new designs and production transitions, ROHS3-compliant alternatives are recommended.