LM2576T-012 Equivalent & Substitute Parts

Part Overview

The LM2576T-012 is a buck switching regulator IC from onsemi, designed for step-down voltage conversion with a fixed 12V output at 3A maximum current. This part operates across a 7V to 40V input range and is housed in a TO-220-5 through-hole package. The LM2576T-012 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across input voltage range, output voltage specification, output current capability, switching topology, and package form factor.

Substiute Parts

LM2576T-012

onsemiIn Stock: 1103LM2576T-012 Datasheet

Current PartRFQ

LM2576T-012G

onsemiIn Stock: 10135LM2576T-012G Datasheet

DirectRFQ

LM2575-12WT

Microchip TechnologyIn Stock: 7262LM2575-12WT Datasheet

SimilarRFQ

LM2576-12WT

Microchip TechnologyIn Stock: 1114LM2576-12WT Datasheet

SimilarRFQ

LM2595T-12/NOPB

Texas InstrumentsIn Stock: 3785LM2595T-12/NOPB Datasheet

SimilarRFQ

LM2596T-12/NOPB

Texas InstrumentsIn Stock: 1000441LM2596T-12/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2576T-012 is determined by the following critical parameters: fixed 12V output voltage, 3A output current capability, TO-220-5 package, through-hole mounting, and buck topology. Parts are grouped into two categories:

Direct Substitutes (Identical Specifications): Parts that match all electrical and mechanical parameters of the LM2576T-012, including 3A output current and 12V fixed output.

Similar Substitutes (Reduced Current Rating): Parts that maintain 12V fixed output and TO-220-5 package but with reduced output current (1A), suitable only for applications requiring lower current delivery.

All substitute parts maintain the same switching topology (buck), package form factor (TO-220-5), and operating temperature range (-40°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (3A Output Current Required):

LM2576T-012G (onsemi) provides the closest match as a direct pin-compatible substitute with identical electrical specifications. This part maintains the same 52kHz switching frequency and 3A output current. LM2576T-012G is ROHS3 compliant and carries active product status from onsemi's successor product line.

LM2576-12WT (Microchip Technology) is a functionally equivalent alternative with active product status. It maintains 3A output capability, 12V fixed output, and TO-220-5 package. The lower minimum input voltage (4V vs. 7V) provides expanded input range compatibility. ROHS3 compliance and active status support long-term availability.

LM2596T-12/NOPB (Texas Instruments) offers 3A output current with active product status and ROHS3 compliance. The higher switching frequency (150kHz) reduces output filter component size. Minimum input voltage of 4.5V provides broader input compatibility than the original part.

For Current-Limited Applications (1A Output Current Acceptable):

LM2575-12WT (Microchip Technology) and LM2595T-12/NOPB (Texas Instruments) are suitable only when application requirements permit 1A maximum output current. Both maintain 12V fixed output and TO-220-5 package with active product status and ROHS3 compliance.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing environmental and regulatory requirements. The original LM2576T-012 is RoHS non-compliant; migration to compliant alternatives is recommended for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM2575-12WT or LM2595T-12/NOPB replace LM2576T-012 in existing designs?

A: These parts are suitable only if the application circuit requires maximum 1A output current. The LM2576T-012 is rated for 3A; using a 1A-rated substitute in a 3A application will result in thermal shutdown and circuit failure. Verify actual load current requirements before substitution.

Q: What is the impact of switching frequency differences between 52kHz and 150kHz?

A: Higher switching frequency (150kHz in LM2596T-12/NOPB and LM2595T-12/NOPB) allows smaller output filter inductors and capacitors. Lower frequency (52kHz in LM2576T-012 and equivalents) requires larger filter components. Circuit board layout and component availability may influence selection, but electrical performance remains equivalent at the specified output voltage and current.

Q: Are there package or pinout differences between these parts?

A: All listed parts use TO-220-5 through-hole package with identical pinout. Direct board-level substitution is possible without layout modification.

Q: Why is LM2576T-012G preferred over LM2576-12WT?

A: LM2576T-012G maintains the original onsemi manufacturer lineage and identical 52kHz switching frequency, minimizing circuit redesign. LM2576-12WT (Microchip) is functionally equivalent but represents a different manufacturer's product line. Selection depends on supply chain preference and design validation requirements.

Q: What is the significance of RoHS compliance status?

A: The original LM2576T-012 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current environmental regulations for new product designs and ensuring compliance with customer procurement requirements.

Q: Can input voltage range differences affect circuit design?

A: The original part specifies 7V minimum input; substitutes from Microchip and Texas Instruments specify 4V or 4.5V minimum. Lower minimum input voltage provides design flexibility but does not require circuit modification. Maximum input voltage (40V) is consistent across all parts.